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The iluEdgeDetectS function detects the edges of the current image.
ILboolean iluEdgeDetectS( ILvoid );
iluEdgeDetectS detects the edges in the current image by combining two convolution filters. The filters used are Sobel filters. The two filters are:
ILU_ILLEGAL_OPERATION - There is currently no image bound. Use ilGenImages and ilBindImage before calling this function.
ilGenImages, ilBindImage, iluEdgeDetectP