Back to Aurora Vision Studio website

You are here: Start » Filter Reference » Image » Image Local Transforms » TopHatImage

TopHatImage


Module: FoundationLite

Performs a morphological white top hat operation on a image using a predefined kernel.

Name Type Range Description
Input value inImage Image Input image
Input value inRoi Region* Range of outImage pixels to be computed
Input value inSourceRoi Region* Range of inImage pixels to be considered in computations
Input value inBorderColor Pixel* Color of the imaginary pixels outside the image boundaries
Input value inKernel KernelShape Kernel shape
Input value inRadiusX Integer 0 - Nearly half of the kernel's width (2*R+1)
Input value inRadiusY Integer* 0 - Nearly half of the kernel's height (2*R+1), or same as inRadiusX
Output value outImage Image Output image
Diagnostic input diagKernel Region Kernel shape

Description

Extracts from image small objects that are brighter than surroundings.

Is performed by running consecutively two filters. OpenImage to get the image without small objects and SubtractFromImage to remove everything but them.

Examples

Top Hat used to remove bigger objects. Used parameters inKernel=Ellipse and inRadiusX=6. Source image on the left and result on the right.

Hardware Acceleration

This operation is optimized for SSE2 technology for pixels of types: all formats (when inSourceRoi = NIL and inBorderColor = NIL).

This operation is optimized for NEON technology for pixels of types: all formats (when inSourceRoi = NIL and inBorderColor = NIL).

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 Region exceeds an input image in TopHatImage.

Complexity Level

This filter is available on Basic Complexity Level.

Filter Group

This filter is member of TopHatImage filter group.