Specifications

Histogram, Threshold, and Compare Functions
10-13
10
Greater
Tests if the pixel values of the
first image are greater than
those of the second image.
IPLStatus iplGreater (IplImage* img1, IplImage* img2 ,
IplImage*
dst );
img1, img2 The source images.
dst The resultant 1-bit image.
Discussion
The function iplGreater() compares the corresponding pixels of two
input images for “greater than” and writes the results to a 1-bit image dst .
If a pixel’s value in
img1 is greater than that pixel’s value in img2 , then the
corresponding pixel in
dst is set to 1; otherwise the pixel in dst is set to 0.
The images
img1 and img2 must have the same bit depth, origin, and COI
settings. If the COI is not set, an
img1 pixel is considered to be “greater”
than an
img2 pixel only if each channel in the img1 pixel is greater than
that channel in the
img2 pixel. If the COI is set, the function compares only
the COI values.
The function returns
IPL_StsOK if the compare operation is successful.
If you pass incompatible img1 and img2 or a null pointer, the function does
not perform the compare operation and returns an error status code.