ImageView.py 25.4 KB
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# -*- coding: utf-8 -*-
"""
ImageView.py -  Widget for basic image dispay and analysis
Copyright 2010  Luke Campagnola
Distributed under MIT/X11 license. See license.txt for more infomation.

Widget used for displaying 2D or 3D data. Features:
  - float or int (including 16-bit int) image display via ImageItem
  - zoom/pan via GraphicsView
  - black/white level controls
  - time slider for 3D data sets
  - ROI plotting
  - Image normalization through a variety of methods
"""
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from pyqtgraph.Qt import QtCore, QtGui, USE_PYSIDE
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if USE_PYSIDE:
    from .ImageViewTemplate_pyside import *
else:
    from .ImageViewTemplate_pyqt import *
    
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from pyqtgraph.graphicsItems.ImageItem import *
from pyqtgraph.graphicsItems.ROI import *
from pyqtgraph.graphicsItems.LinearRegionItem import *
from pyqtgraph.graphicsItems.InfiniteLine import *
from pyqtgraph.graphicsItems.ViewBox import *
#from widgets import ROI
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import sys
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#from numpy import ndarray
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import pyqtgraph.ptime as ptime
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import numpy as np
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import pyqtgraph.debug as debug
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from pyqtgraph.SignalProxy import SignalProxy
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#try:
    #import pyqtgraph.metaarray as metaarray
    #HAVE_METAARRAY = True
#except:
    #HAVE_METAARRAY = False
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class PlotROI(ROI):
    def __init__(self, size):
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        ROI.__init__(self, pos=[0,0], size=size) #, scaleSnap=True, translateSnap=True)
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        self.addScaleHandle([1, 1], [0, 0])
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        self.addRotateHandle([0, 0], [0.5, 0.5])
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class ImageView(QtGui.QWidget):
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    """
    Widget used for display and analysis of image data.
    Implements many features:
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    * Displays 2D and 3D image data. For 3D data, a z-axis
      slider is displayed allowing the user to select which frame is displayed.
    * Displays histogram of image data with movable region defining the dark/light levels
    * Editable gradient provides a color lookup table 
    * Frame slider may also be moved using left/right arrow keys as well as pgup, pgdn, home, and end.
    * Basic analysis features including:
    
        * ROI and embedded plot for measuring image values across frames
        * Image normalization / background subtraction 
    
    Basic Usage::
    
        imv = pg.ImageView()
        imv.show()
        imv.setImage(data)
    """
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    sigTimeChanged = QtCore.Signal(object, object)
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    sigProcessingChanged = QtCore.Signal(object)
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    def __init__(self, parent=None, name="ImageView", view=None, imageItem=None, *args):
        """
        By default, this class creates an :class:`ImageItem <pyqtgraph.ImageItem>` to display image data
        and a :class:`ViewBox <pyqtgraph.ViewBox>` to contain the ImageItem. Custom items may be given instead 
        by specifying the *view* and/or *imageItem* arguments.
        """
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        QtGui.QWidget.__init__(self, parent, *args)
        self.levelMax = 4096
        self.levelMin = 0
        self.name = name
        self.image = None
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        self.axes = {}
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        self.imageDisp = None
        self.ui = Ui_Form()
        self.ui.setupUi(self)
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        self.scene = self.ui.graphicsView.scene()
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        self.ignoreTimeLine = False
        
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        #if 'linux' in sys.platform.lower():   ## Stupid GL bug in linux.
        #    self.ui.graphicsView.setViewport(QtGui.QWidget())
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        #self.ui.graphicsView.enableMouse(True)
        #self.ui.graphicsView.autoPixelRange = False
        #self.ui.graphicsView.setAspectLocked(True)
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        #self.ui.graphicsView.invertY()
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        #self.ui.graphicsView.enableMouse()
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        if view is None:
            self.view = ViewBox()
        else:
            self.view = view
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        self.ui.graphicsView.setCentralItem(self.view)
        self.view.setAspectLocked(True)
        self.view.invertY()
        
        #self.ticks = [t[0] for t in self.ui.gradientWidget.listTicks()]
        #self.ticks[0].colorChangeAllowed = False
        #self.ticks[1].colorChangeAllowed = False
        #self.ui.gradientWidget.allowAdd = False
        #self.ui.gradientWidget.setTickColor(self.ticks[1], QtGui.QColor(255,255,255))
        #self.ui.gradientWidget.setOrientation('right')
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        if imageItem is None:
            self.imageItem = ImageItem()
        else:
            self.imageItem = imageItem
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        self.view.addItem(self.imageItem)
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        self.currentIndex = 0
        
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        self.ui.histogram.setImageItem(self.imageItem)
        
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        self.ui.normGroup.hide()

        self.roi = PlotROI(10)
        self.roi.setZValue(20)
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        self.view.addItem(self.roi)
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        self.roi.hide()
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        self.normRoi = PlotROI(10)
        self.normRoi.setPen(QtGui.QPen(QtGui.QColor(255,255,0)))
        self.normRoi.setZValue(20)
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        self.view.addItem(self.normRoi)
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        self.normRoi.hide()
        #self.ui.roiPlot.hide()
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        self.roiCurve = self.ui.roiPlot.plot()
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        self.timeLine = InfiniteLine(0, movable=True)
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        self.timeLine.setPen(QtGui.QPen(QtGui.QColor(255, 255, 0, 200)))
        self.timeLine.setZValue(1)
        self.ui.roiPlot.addItem(self.timeLine)
        self.ui.splitter.setSizes([self.height()-35, 35])
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        self.ui.roiPlot.hideAxis('left')
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        self.keysPressed = {}
        self.playTimer = QtCore.QTimer()
        self.playRate = 0
        self.lastPlayTime = 0
        
        #self.normLines = []
        #for i in [0,1]:
            #l = InfiniteLine(self.ui.roiPlot, 0)
            #l.setPen(QtGui.QPen(QtGui.QColor(0, 100, 200, 200)))
            #self.ui.roiPlot.addItem(l)
            #self.normLines.append(l)
            #l.hide()
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        self.normRgn = LinearRegionItem()
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        self.normRgn.setZValue(0)
        self.ui.roiPlot.addItem(self.normRgn)
        self.normRgn.hide()
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        ## wrap functions from view box
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        for fn in ['addItem', 'removeItem']:
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            setattr(self, fn, getattr(self.view, fn))

        ## wrap functions from histogram
        for fn in ['setHistogramRange', 'autoHistogramRange', 'getLookupTable', 'getLevels']:
            setattr(self, fn, getattr(self.ui.histogram, fn))
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        self.timeLine.sigPositionChanged.connect(self.timeLineChanged)
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        #self.ui.gradientWidget.sigGradientChanged.connect(self.updateImage)
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        self.ui.roiBtn.clicked.connect(self.roiClicked)
        self.roi.sigRegionChanged.connect(self.roiChanged)
        self.ui.normBtn.toggled.connect(self.normToggled)
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        self.ui.normDivideRadio.clicked.connect(self.normRadioChanged)
        self.ui.normSubtractRadio.clicked.connect(self.normRadioChanged)
        self.ui.normOffRadio.clicked.connect(self.normRadioChanged)
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        self.ui.normROICheck.clicked.connect(self.updateNorm)
        self.ui.normFrameCheck.clicked.connect(self.updateNorm)
        self.ui.normTimeRangeCheck.clicked.connect(self.updateNorm)
        self.playTimer.timeout.connect(self.timeout)
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        self.normProxy = SignalProxy(self.normRgn.sigRegionChanged, slot=self.updateNorm)
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        self.normRoi.sigRegionChangeFinished.connect(self.updateNorm)
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        self.ui.roiPlot.registerPlot(self.name + '_ROI')
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        self.noRepeatKeys = [QtCore.Qt.Key_Right, QtCore.Qt.Key_Left, QtCore.Qt.Key_Up, QtCore.Qt.Key_Down, QtCore.Qt.Key_PageUp, QtCore.Qt.Key_PageDown]
        
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        self.roiClicked() ## initialize roi plot to correct shape / visibility

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    def setImage(self, img, autoRange=True, autoLevels=True, levels=None, axes=None, xvals=None, pos=None, scale=None, transform=None):
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        """
        Set the image to be displayed in the widget.
        
        ============== =======================================================================
        **Arguments:**
        *img*          (numpy array) the image to be displayed.
        *xvals*        (numpy array) 1D array of z-axis values corresponding to the third axis
                       in a 3D image. For video, this array should contain the time of each frame.
        *autoRange*    (bool) whether to scale/pan the view to fit the image.
        *autoLevels*   (bool) whether to update the white/black levels to fit the image.
        *levels*       (min, max); the white and black level values to use.
        *axes*         Dictionary indicating the interpretation for each axis.
                       This is only needed to override the default guess. Format is::
                       
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                           {'t':0, 'x':1, 'y':2, 'c':3};
        
        *pos*          Change the position of the displayed image
        *scale*        Change the scale of the displayed image
        *transform*    Set the transform of the dispalyed image. This option overrides *pos*
                       and *scale*.
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        ============== =======================================================================
        """
        prof = debug.Profiler('ImageView.setImage', disabled=True)
        
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        if hasattr(img, 'implements') and img.implements('MetaArray'):
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            img = img.asarray()
        
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        if not isinstance(img, np.ndarray):
            raise Exception("Image must be specified as ndarray.")
        self.image = img
        
        if xvals is not None:
            self.tVals = xvals
        elif hasattr(img, 'xvals'):
            try:
                self.tVals = img.xvals(0)
            except:
                self.tVals = np.arange(img.shape[0])
        else:
            self.tVals = np.arange(img.shape[0])
        #self.ui.timeSlider.setValue(0)
        #self.ui.normStartSlider.setValue(0)
        #self.ui.timeSlider.setMaximum(img.shape[0]-1)
        prof.mark('1')
        
        if axes is None:
            if img.ndim == 2:
                self.axes = {'t': None, 'x': 0, 'y': 1, 'c': None}
            elif img.ndim == 3:
                if img.shape[2] <= 4:
                    self.axes = {'t': None, 'x': 0, 'y': 1, 'c': 2}
                else:
                    self.axes = {'t': 0, 'x': 1, 'y': 2, 'c': None}
            elif img.ndim == 4:
                self.axes = {'t': 0, 'x': 1, 'y': 2, 'c': 3}
            else:
                raise Exception("Can not interpret image with dimensions %s" % (str(img.shape)))
        elif isinstance(axes, dict):
            self.axes = axes.copy()
        elif isinstance(axes, list) or isinstance(axes, tuple):
            self.axes = {}
            for i in range(len(axes)):
                self.axes[axes[i]] = i
        else:
            raise Exception("Can not interpret axis specification %s. Must be like {'t': 2, 'x': 0, 'y': 1} or ('t', 'x', 'y', 'c')" % (str(axes)))
            
        for x in ['t', 'x', 'y', 'c']:
            self.axes[x] = self.axes.get(x, None)
        prof.mark('2')
            
        self.imageDisp = None
        
        
        prof.mark('3')
            
        self.currentIndex = 0
        self.updateImage()
        if levels is None and autoLevels:
            self.autoLevels()
        if levels is not None:  ## this does nothing since getProcessedImage sets these values again.
            self.levelMax = levels[1]
            self.levelMin = levels[0]
            
        if self.ui.roiBtn.isChecked():
            self.roiChanged()
        prof.mark('4')
            
            
        if self.axes['t'] is not None:
            #self.ui.roiPlot.show()
            self.ui.roiPlot.setXRange(self.tVals.min(), self.tVals.max())
            self.timeLine.setValue(0)
            #self.ui.roiPlot.setMouseEnabled(False, False)
            if len(self.tVals) > 1:
                start = self.tVals.min()
                stop = self.tVals.max() + abs(self.tVals[-1] - self.tVals[0]) * 0.02
            elif len(self.tVals) == 1:
                start = self.tVals[0] - 0.5
                stop = self.tVals[0] + 0.5
            else:
                start = 0
                stop = 1
            for s in [self.timeLine, self.normRgn]:
                s.setBounds([start, stop])
        #else:
            #self.ui.roiPlot.hide()
        prof.mark('5')
            
        self.imageItem.resetTransform()
        if scale is not None:
            self.imageItem.scale(*scale)
        if pos is not None:
            self.imageItem.setPos(*pos)
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        if transform is not None:
            self.imageItem.setTransform(transform)
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        prof.mark('6')
            
        if autoRange:
            self.autoRange()
        self.roiClicked()
        prof.mark('7')
        prof.finish()

        
    def play(self, rate):
        """Begin automatically stepping frames forward at the given rate (in fps).
        This can also be accessed by pressing the spacebar."""
        #print "play:", rate
        self.playRate = rate
        if rate == 0:
            self.playTimer.stop()
            return
            
        self.lastPlayTime = ptime.time()
        if not self.playTimer.isActive():
            self.playTimer.start(16)
            
        

    def autoLevels(self):
        """Set the min/max levels automatically to match the image data."""
        #image = self.getProcessedImage()
        self.setLevels(self.levelMin, self.levelMax)
        
        #self.ui.histogram.imageChanged(autoLevel=True)
            

    def setLevels(self, min, max):
        """Set the min/max (bright and dark) levels."""
        self.ui.histogram.setLevels(min, max)

    def autoRange(self):
        """Auto scale and pan the view around the image."""
        image = self.getProcessedImage()
        
        #self.ui.graphicsView.setRange(QtCore.QRectF(0, 0, image.shape[self.axes['x']], image.shape[self.axes['y']]), padding=0., lockAspect=True)        
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        self.view.autoRange() ##setRange(self.imageItem.viewBoundingRect(), padding=0.)
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    def getProcessedImage(self):
        """Returns the image data after it has been processed by any normalization options in use."""
        if self.imageDisp is None:
            image = self.normalize(self.image)
            self.imageDisp = image
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            self.levelMin, self.levelMax = list(map(float, ImageView.quickMinMax(self.imageDisp)))
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            self.ui.histogram.setHistogramRange(self.levelMin, self.levelMax)
            
        return self.imageDisp
        
        
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    def close(self):
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        """Closes the widget nicely, making sure to clear the graphics scene and release memory."""
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        self.ui.roiPlot.close()
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        self.ui.graphicsView.close()
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        #self.ui.gradientWidget.sigGradientChanged.disconnect(self.updateImage)
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        self.scene.clear()
        del self.image
        del self.imageDisp
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        self.setParent(None)
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    def keyPressEvent(self, ev):
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        #print ev.key()
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        if ev.key() == QtCore.Qt.Key_Space:
            if self.playRate == 0:
                fps = (self.getProcessedImage().shape[0]-1) / (self.tVals[-1] - self.tVals[0])
                self.play(fps)
                #print fps
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            else:
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                self.play(0)
            ev.accept()
        elif ev.key() == QtCore.Qt.Key_Home:
            self.setCurrentIndex(0)
            self.play(0)
            ev.accept()
        elif ev.key() == QtCore.Qt.Key_End:
            self.setCurrentIndex(self.getProcessedImage().shape[0]-1)
            self.play(0)
            ev.accept()
        elif ev.key() in self.noRepeatKeys:
            ev.accept()
            if ev.isAutoRepeat():
                return
            self.keysPressed[ev.key()] = 1
            self.evalKeyState()
        else:
            QtGui.QWidget.keyPressEvent(self, ev)

    def keyReleaseEvent(self, ev):
        if ev.key() in [QtCore.Qt.Key_Space, QtCore.Qt.Key_Home, QtCore.Qt.Key_End]:
            ev.accept()
        elif ev.key() in self.noRepeatKeys:
            ev.accept()
            if ev.isAutoRepeat():
                return
            try:
                del self.keysPressed[ev.key()]
            except:
                self.keysPressed = {}
            self.evalKeyState()
        else:
            QtGui.QWidget.keyReleaseEvent(self, ev)
        
        
    def evalKeyState(self):
        if len(self.keysPressed) == 1:
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            key = list(self.keysPressed.keys())[0]
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            if key == QtCore.Qt.Key_Right:
                self.play(20)
                self.jumpFrames(1)
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                self.lastPlayTime = ptime.time() + 0.2  ## 2ms wait before start
                                                        ## This happens *after* jumpFrames, since it might take longer than 2ms
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            elif key == QtCore.Qt.Key_Left:
                self.play(-20)
                self.jumpFrames(-1)
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                self.lastPlayTime = ptime.time() + 0.2
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            elif key == QtCore.Qt.Key_Up:
                self.play(-100)
            elif key == QtCore.Qt.Key_Down:
                self.play(100)
            elif key == QtCore.Qt.Key_PageUp:
                self.play(-1000)
            elif key == QtCore.Qt.Key_PageDown:
                self.play(1000)
        else:
            self.play(0)
        
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    def timeout(self):
        now = ptime.time()
        dt = now - self.lastPlayTime
        if dt < 0:
            return
        n = int(self.playRate * dt)
        #print n, dt
        if n != 0:
            #print n, dt, self.lastPlayTime
            self.lastPlayTime += (float(n)/self.playRate)
            if self.currentIndex+n > self.image.shape[0]:
                self.play(0)
            self.jumpFrames(n)
        
    def setCurrentIndex(self, ind):
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        """Set the currently displayed frame index."""
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        self.currentIndex = np.clip(ind, 0, self.getProcessedImage().shape[0]-1)
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        self.updateImage()
        self.ignoreTimeLine = True
        self.timeLine.setValue(self.tVals[self.currentIndex])
        self.ignoreTimeLine = False

    def jumpFrames(self, n):
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        """Move video frame ahead n frames (may be negative)"""
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        if self.axes['t'] is not None:
            self.setCurrentIndex(self.currentIndex + n)

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    def normRadioChanged(self):
        self.imageDisp = None
        self.updateImage()
        self.roiChanged()
        self.sigProcessingChanged.emit(self)
        
    
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    def updateNorm(self):
        #for l, sl in zip(self.normLines, [self.ui.normStartSlider, self.ui.normStopSlider]):
            #if self.ui.normTimeRangeCheck.isChecked():
                #l.show()
            #else:
                #l.hide()
            
            #i, t = self.timeIndex(sl)
            #l.setPos(t)
        
        if self.ui.normTimeRangeCheck.isChecked():
            #print "show!"
            self.normRgn.show()
        else:
            self.normRgn.hide()
        
        if self.ui.normROICheck.isChecked():
            #print "show!"
            self.normRoi.show()
        else:
            self.normRoi.hide()
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        if not self.ui.normOffRadio.isChecked():
            self.imageDisp = None
            self.updateImage()
            self.roiChanged()
            self.sigProcessingChanged.emit(self)
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    def normToggled(self, b):
        self.ui.normGroup.setVisible(b)
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        self.normRoi.setVisible(b and self.ui.normROICheck.isChecked())
        self.normRgn.setVisible(b and self.ui.normTimeRangeCheck.isChecked())
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    def hasTimeAxis(self):
        return 't' in self.axes and self.axes['t'] is not None

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    def roiClicked(self):
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        showRoiPlot = False
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        if self.ui.roiBtn.isChecked():
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            showRoiPlot = True
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            self.roi.show()
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            #self.ui.roiPlot.show()
            self.ui.roiPlot.setMouseEnabled(True, True)
            self.ui.splitter.setSizes([self.height()*0.6, self.height()*0.4])
            self.roiCurve.show()
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            self.roiChanged()
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            self.ui.roiPlot.showAxis('left')
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        else:
            self.roi.hide()
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            self.ui.roiPlot.setMouseEnabled(False, False)
            self.roiCurve.hide()
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            self.ui.roiPlot.hideAxis('left')
            
        if self.hasTimeAxis():
            showRoiPlot = True
            mn = self.tVals.min()
            mx = self.tVals.max()
            self.ui.roiPlot.setXRange(mn, mx, padding=0.01)
            self.timeLine.show()
            self.timeLine.setBounds([mn, mx])
            self.ui.roiPlot.show()
            if not self.ui.roiBtn.isChecked():
                self.ui.splitter.setSizes([self.height()-35, 35])
        else:
            self.timeLine.hide()
            #self.ui.roiPlot.hide()
            
        self.ui.roiPlot.setVisible(showRoiPlot)
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    def roiChanged(self):
        if self.image is None:
            return
            
        image = self.getProcessedImage()
        if image.ndim == 2:
            axes = (0, 1)
        elif image.ndim == 3:
            axes = (1, 2)
        else:
            return
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        data, coords = self.roi.getArrayRegion(image.view(np.ndarray), self.imageItem, axes, returnMappedCoords=True)
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        if data is not None:
            while data.ndim > 1:
                data = data.mean(axis=1)
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            if image.ndim == 3:
                self.roiCurve.setData(y=data, x=self.tVals)
            else:
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                while coords.ndim > 2:
                    coords = coords[:,:,0]
                coords = coords - coords[:,0,np.newaxis]
                xvals = (coords**2).sum(axis=0) ** 0.5
                self.roiCurve.setData(y=data, x=xvals)
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            #self.ui.roiPlot.replot()

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    @staticmethod
    def quickMinMax(data):
        while data.size > 1e6:
            ax = np.argmax(data.shape)
            sl = [slice(None)] * data.ndim
            sl[ax] = slice(None, None, 2)
            data = data[sl]
        return data.min(), data.max()

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    def normalize(self, image):
        
        if self.ui.normOffRadio.isChecked():
            return image
            
        div = self.ui.normDivideRadio.isChecked()
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        norm = image.view(np.ndarray).copy()
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        #if div:
            #norm = ones(image.shape)
        #else:
            #norm = zeros(image.shape)
        if div:
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            norm = norm.astype(np.float32)
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        if self.ui.normTimeRangeCheck.isChecked() and image.ndim == 3:
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            (sind, start) = self.timeIndex(self.normRgn.lines[0])
            (eind, end) = self.timeIndex(self.normRgn.lines[1])
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            #print start, end, sind, eind
            n = image[sind:eind+1].mean(axis=0)
            n.shape = (1,) + n.shape
            if div:
                norm /= n
            else:
                norm -= n
                
        if self.ui.normFrameCheck.isChecked() and image.ndim == 3:
            n = image.mean(axis=1).mean(axis=1)
            n.shape = n.shape + (1, 1)
            if div:
                norm /= n
            else:
                norm -= n
            
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        if self.ui.normROICheck.isChecked() and image.ndim == 3:
            n = self.normRoi.getArrayRegion(norm, self.imageItem, (1, 2)).mean(axis=1).mean(axis=1)
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            n = n[:,np.newaxis,np.newaxis]
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            #print start, end, sind, eind
            if div:
                norm /= n
            else:
                norm -= n
                
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        return norm
        
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    def timeLineChanged(self):
        #(ind, time) = self.timeIndex(self.ui.timeSlider)
        if self.ignoreTimeLine:
            return
        self.play(0)
        (ind, time) = self.timeIndex(self.timeLine)
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        if ind != self.currentIndex:
            self.currentIndex = ind
            self.updateImage()
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        #self.timeLine.setPos(time)
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        #self.emit(QtCore.SIGNAL('timeChanged'), ind, time)
        self.sigTimeChanged.emit(ind, time)
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    def updateImage(self):
        ## Redraw image on screen
        if self.image is None:
            return
            
        image = self.getProcessedImage()
        #print "update:", image.ndim, image.max(), image.min(), self.blackLevel(), self.whiteLevel()
        if self.axes['t'] is None:
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            #self.ui.timeSlider.hide()
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            self.imageItem.updateImage(image)
            #self.ui.roiPlot.hide()
            #self.ui.roiBtn.hide()
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        else:
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            #self.ui.roiBtn.show()
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            self.ui.roiPlot.show()
            #self.ui.timeSlider.show()
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            self.imageItem.updateImage(image[self.currentIndex])
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    def timeIndex(self, slider):
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        ## Return the time and frame index indicated by a slider
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        if self.image is None:
            return (0,0)
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        #v = slider.value()
        #vmax = slider.maximum()
        #f = float(v) / vmax
        
        t = slider.value()
        
        #t = 0.0
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        #xv = self.image.xvals('Time') 
        xv = self.tVals
        if xv is None:
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            ind = int(t)
            #ind = int(f * self.image.shape[0])
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        else:
            if len(xv) < 2:
                return (0,0)
            totTime = xv[-1] + (xv[-1]-xv[-2])
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            #t = f * totTime
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            inds = np.argwhere(xv < t)
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            if len(inds) < 1:
                return (0,t)
            ind = inds[-1,0]
        #print ind
        return ind, t

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    #def whiteLevel(self):
        #return self.levelMin + (self.levelMax-self.levelMin) * self.ui.gradientWidget.tickValue(self.ticks[1])
        ##return self.levelMin + (self.levelMax-self.levelMin) * self.ui.whiteSlider.value() / self.ui.whiteSlider.maximum() 
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    #def blackLevel(self):
        #return self.levelMin + (self.levelMax-self.levelMin) * self.ui.gradientWidget.tickValue(self.ticks[0])
        ##return self.levelMin + ((self.levelMax-self.levelMin) / self.ui.blackSlider.maximum()) * self.ui.blackSlider.value()
        
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    def getView(self):
        """Return the ViewBox (or other compatible object) which displays the ImageItem"""
        return self.view
        
    def getImageItem(self):
        """Return the ImageItem for this ImageView."""
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        return self.imageItem
        
    def getRoiPlot(self):
        """Return the ROI PlotWidget for this ImageView"""
        return self.ui.roiPlot
       
    def getHistogramWidget(self):
        """Return the HistogramLUTWidget for this ImageView"""
        return self.ui.histogram