CompareImages: Plot 2 images to compare them

A widget dedicated to compare 2 images.

CompareImages class

class CompareImages(parent=None, backend=None)

Widget providing tools to compare 2 images.

Parameters:

• parent (Union[qt.QWidget,None]) – Parent of this widget.
• backend (str or BackendBase.BackendBase) – The backend to use, in: ‘matplotlib’ (default), ‘mpl’, ‘opengl’, ‘gl’, ‘none’ or a BackendBase.BackendBase class

class VisualizationMode

Available visualization modes

class AlignmentMode

Available alignment modes

sigConfigurationChanged = <PySide.QtCore.Signal object>

Emitted when the configuration of the widget (visualization mode, alignement mode…) have changed.

getPlot()

Returns the plot which is used to display the images.

Return type:silx.gui.plot.PlotWidget

getRawPixelData(x, y)

Return the raw pixel of each image data from axes positions.

If the coordinate is outside of the image it returns None element in the tuple.

The pixel is reach from the raw data image without filter or transformation. But the coordinate x and y are in the reference of the current displayed mode.

Parameters:

• x (float) – X-coordinate of the pixel in the current displayed plot
• y (float) – Y-coordinate of the pixel in the current displayed plot

Returns:

A tuple of for each images containing pixel information. It could be a scalar value or an array in case of RGB/RGBA informations. It also could be a string containing information is some cases.

Return type:

Tuple(Union[int,float,numpy.ndarray,str],Union[int,float,numpy.ndarray,str])

setVisualizationMode(mode)

Set the visualization mode.

Parameters:mode (str) – New visualization to display the image comparison

getVisualizationMode()

Returns the current interaction mode.

setAlignmentMode(mode)

Set the alignment mode.

Parameters:mode (str) – New alignement to apply to images

getAlignmentMode()

Returns the current selected alignemnt mode.

setKeypointsVisible(isVisible)

Set keypoints visibility.

Parameters:isVisible (bool) – If True, keypoints are displayed (if some)

setData(image1, image2)

Set images to compare.

Images can contains floating-point or integer values, or RGB and RGBA values, but should have comparable intensities.

RGB and RGBA images are provided as an array as [width,height,channels] of usigned integer 8-bits or floating-points between 0.0 to 1.0.

Parameters:

• image1 (numpy.ndarray) – The first image
• image2 (numpy.ndarray) – The second image

setImage1(image1)

Set image1 to be compared.

Images can contains floating-point or integer values, or RGB and RGBA values, but should have comparable intensities.

RGB and RGBA images are provided as an array as [width,height,channels] of usigned integer 8-bits or floating-points between 0.0 to 1.0.

Parameters:image1 (numpy.ndarray) – The first image

setImage2(image2)

Set image2 to be compared.

Images can contains floating-point or integer values, or RGB and RGBA values, but should have comparable intensities.

RGB and RGBA images are provided as an array as [width,height,channels] of usigned integer 8-bits or floating-points between 0.0 to 1.0.

Parameters:image2 (numpy.ndarray) – The second image

getTransformation()

Retuns the affine transformation applied to the second image to align it to the first image.

This result is only valid for sift alignment.

Return type:Union[None,AffineTransformation]