https://community.intel.com/t5/Intel-Integrated-Performance/Sobel-kernels-switched/m-p/879257#M9960 <P>Is it me or are the horizontal and verical Sobel kernels switched both in the ippi documentation and in the lib? The documented horizontal kernel is a vertical kernel and vice versa. Is thisa type of bug/oversight that will be corrected in future versions?</P> Wed, 12 Dec 2007 15:26:19 GMT mrhavlin 2007-12-12T15:26:19Z https://community.intel.com/t5/Intel-Integrated-Performance/Sobel-kernels-switched/m-p/879257#M9960 <P>Is it me or are the horizontal and verical Sobel kernels switched both in the ippi documentation and in the lib? The documented horizontal kernel is a vertical kernel and vice versa. Is thisa type of bug/oversight that will be corrected in future versions?</P> Wed, 12 Dec 2007 15:26:19 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Sobel-kernels-switched/m-p/879257#M9960 mrhavlin 2007-12-12T15:26:19Z https://community.intel.com/t5/Intel-Integrated-Performance/Sobel-kernels-switched/m-p/879258#M9961 <P>Vertical and horizontal Sobel functions are called because of their vertical and horizontal rows in their kernels. So "vertical" Sobel calculates dx and "horizontal" Sobel calculates dy.</P> <P>Another feature is that <FONT face="Courier New" size="2">ippiFilterSobelVert <FONT face="Times New Roman" size="3">functions calculate -dx, not dx</FONT></FONT></P> <P><FONT face="Courier New" size="2"><FONT face="Times New Roman" size="3">You could use fixed filters "with border" that have "Border" suffix in the name. They do not require border pixels in memory. Also there is <FONT face="Courier New" size="2"></FONT></FONT></FONT></P> <P align="left">ippiFilterSobelNegVertBorderfunction that calculates dx</P> Wed, 19 Dec 2007 09:32:10 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Sobel-kernels-switched/m-p/879258#M9961 Intel_C_Intel 2007-12-19T09:32:10Z