HALCON Reference Manual 10.0.2

Name

gray_openinggray_openinggray_openingGrayOpeningGrayOpening — Perform a gray value opening on an image.

Signature

gray_opening(Image, SE : ImageOpening : : )

gray_openinggray_openinggray_openingGrayOpeningGrayOpening applies a gray value opening to the input image ImageImageImageImageimage with the structuring element SESESESESE. The image type of the structuring element SESESESESE must match the image type of the input image ImageImageImageImageimage. The gray value opening of an image i with a structuring element s is defined as

  i -+ s = (i - s) + transpose(s) ,

i.e., an erosion of the image with s followed by a dilation with the transposed structuring element (see gray_erosiongray_erosiongray_erosionGrayErosionGrayErosion and gray_dilationgray_dilationgray_dilationGrayDilationGrayDilation). For the generation of structuring elements, see read_gray_seread_gray_seread_gray_seReadGraySeReadGraySe.

The gray value opening is particularly fast for flat structuring elements, i.e., structuring elements with a constant gray level within their domain.

Parallelization

Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Automatically parallelized on tuple level.
Automatically parallelized on internal data level.

Parameters

ImageImageImageImageimage (input_object) (multichannel-)image(-array) → object (byte / uint2 / real)

Input image.

SESESESESE (input_object) singlechannelimage → object (byte / uint2 / real)

Structuring element.

ImageOpeningImageOpeningImageOpeningImageOpeningimageOpening (output_object) (multichannel-)image(-array) → object (byte / uint2 / real)

Gray-opened image.

Result

gray_openinggray_openinggray_openingGrayOpeningGrayOpening returns 2 (H_MSG_TRUE) if the structuring element is not the empty region. Otherwise, an exception is raised.