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DifferenceImage

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Module: FoundationLite

Computes the non-negative distances between corresponding pixel values.

Applications

Useful for things like comparing an image against a template or for detecting differences between consecutive video frames.
Name Type Description
Input value
 inImage1 Image First input image
Input value
 inImage2 Image Second input image
Input value
 inRoi Region* Range of pixels to be processed
Output value
 outImage Image Output image

Description

The operation computes the absolute difference between images. Each outImage pixel is equal to the absolute value of difference between corresponding pixels of the input images.

In multichannel (color) images each pixel channel is processed separately.

The operation requires that the images being processed have equal format and dimensions, otherwise an error with appropriate description occurs. To obtain an image of desired dimensions one can use ResizeImage or CropImage filter. To alter the pixel type of an image one can use ConvertPixelType filter. ConvertToMultichannel and AverageChannels filters allow to alter the number of image channels.

Examples

DifferenceImage performed on the sample images.

Hardware Acceleration

This operation is optimized for SSE2 technology for pixels of types: UINT8, SINT8, UINT16, SINT16, REAL.

This operation is optimized for AVX2 technology for pixels of types: UINT8, SINT8, UINT16, SINT16, REAL.

This operation is optimized for NEON technology for pixels of types: UINT8, SINT8, UINT16, SINT16, SINT32, REAL.

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 Image formats are not the same in DifferenceImage.
DomainError Image sizes are not equal in DifferenceImage.
DomainError Region exceeds an input image in DifferenceImage.

Complexity Level

This filter is available on Advanced Complexity Level.

See Also

  • SubtractImages – Subtracts two images pixel by pixel. The result is signed.
  • DifferenceImage_Flex – Computes the non-negative distances between corresponding pixel values using tiles.