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typical noob errors:

• reinventing the wheel (don't!)
• reinventing the wheel (don't!)
• reinventing the wheel (don't!)
• buffer overruns (need to spare a 1 pixel border for x,y when iterating)
• getting the types wrong (the result won't fit into a uchar)

typical noob errors:

• reinventing the wheel (don't!)
• reinventing the wheel (don't!)
• reinventing the wheel (don't!)
• buffer overruns (need to spare a 1 pixel border for x,y when iterating)
• getting the types wrong (the result won't fit into a uchar)uchar, you need something larger, like CV_16S or CV_32F)