Operators |
gray_tophat — Perform a gray value top hat transformation on an image.
gray_tophat(Image, SE : ImageTopHat : : )
gray_tophat applies a gray value top hat transformation to the input image Image with the structuring element SE. The image type of the structuring element SE must match the image type of the input image Image. The gray value top hat transformation of an image i with a structuring element s is defined as
tophat(i,s) = i - (i -+ s) ,
i.e., the difference of the image and its opening with s (see gray_opening). For the generation of structuring elements, see read_gray_se.
The top hat transformation is particularly fast for flat structuring elements, i.e. structuring elements with a constant gray level within their domain.
Input image.
Structuring element.
Top hat image.
gray_tophat returns 2 (H_MSG_TRUE) if the structuring element is not the empty region. Otherwise, an exception is raised.
read_gray_se, gen_disc_se, read_image
gray_bothat, top_hat, gray_erosion_rect, sub_image
Foundation
Operators |