The return value in all cases is the output image buffer. These functions perform pixelwise arithmetic operations on images. In all cases, the buffers must be the same size. Usually, the sample type of all buffers involved must also be the same. An error message is printed if the combination of image types presented to an operation is unsupported.
Appropriate range clamping is performed when operating on byte-sampled images.
The return value in all cases is the output image buffer. These functions find bounding boxes around features in an image. If no such box can be found, Null is returned. The function returns the smallest rectangle that bounds all areas of the image where the sum of pixcount adjacent horizontal pixels is greater than or equal to thresh . The return value is the same as before.