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Dilation & Erosion for c6400

Other Parts Discussed in Thread: SPRC094

Can anyone help me to use the dilation & erosion function in the c6400 IMGLIB? I'm using v1.04b as can be found on the TI website (SPRC094). For example, I have:

 image_thr(pingPongBufferA, pingPongBufferB, capture_imageCols, capture_imageRows);
 IMG_dilate_bin(pingPongBufferB, pingPongBufferA, deMask, colsper8);

where deMask is a 3x3 square structuring element with all values 1, colsper8  = capture_imageCols/8, the others I believe are self-explanatory.

The problem is when I output pingPongBufferA to a display, I get a grayscale image (i.e. image before thresholding). Anyone can tell me why? Or can anyone spot a mistake I made? I'm using an EVMDM642 with CCS3.3.