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ImageDifferenceImage


Module: FoundationBasic

Computes an image of differences between a moving pattern and the input image.

Name Type Description
inImage Image Input image
inPatternImage Image Pattern to be compared with input image
inRoi Region* Range of pixels to be processed
inPatternRoi Region* Range of pixels in the pattern to be processed
inDistanceMeasure DistanceMeasure Measure of distance
outImage Image Output image

Description

The operation computes the difference between inImage and inPatternImage. The inPatternImage is aligned at each location of the inImage and the similarity between the inPatternImage and the corresponding part of the inImage is estimated using the inDifferenceMeasure as in ImageDifference filter. The result is stored in the pixel of the outImage that corresponds to the location at which the center of inPatternImage was aligned to the inImage.

Examples

A sample inImage.

A sample inPatternImage.

The resulting outImage.

The locations in the inImage corresponding to the darkest points of the outImage.

Hardware Acceleration

This operation is optimized for SSE2 technology for pixels of types: UINT8 (for inDistanceMeasure = MeanError).

This operation is optimized for SSE3 technology for pixels of types: UINT16 (for inDistanceMeasure = MeanError), UINT8 (for inDistanceMeasure = MeanSquaredError), REAL.

This operation is optimized for SSE4 technology for pixels of types: INT16, UINT16 (for inDistanceMeasure = MeanSquaredError).

This operation supports automatic parallelization for multicore and multiprocessor systems.

Errors

This filter can throw an exception to report error. Read how to deal with errors in Error Handling.

List of possible exceptions:

Error type Description
DomainError Not supported distance measure in ImageDifferenceImage.

Complexity Level

This filter is available on Advanced Complexity Level.

See Also

  • LocateMultipleObjects_SAD – Finds multiple occurrences of a predefined template on an image by analysing the Square Average Difference between pixel values.