https://community.intel.com/t5/Intel-Integrated-Performance/ippiResize-and-ippiResizeCenter-usage/m-p/991133#M22326 Hi,<BR /><BR />I have several questions related to ippiResize and ippiResizeCenter.<BR /><BR />ippiResize_8u_C1R(const Ipp8u* pSrc, IppiSize srcSize, int srcStep, IppiRect srcROI,<BR /> Ipp8u* pDst, int dstStep, IppiSize dstRoiSize,<BR /> double xFactor, double yFactor, int interpolation)<BR /><BR />ippiResizeCenter_8u_C1R(const Ipp8u* pSrc, IppiSize srcSize, int srcStep, IppiRect srcRoi,<BR /><BR /> Ipp8u* pDst, int dstStep, IppiSize dstRoiSize,<BR /><BR /> double xFactor, double yFactor,<BR /><BR /> double xCenter, double yCenter, int interpolation);<BR /><BR />My question is essentially a question on coordinate systems used.<BR />Let's start with ippiResize with roi= (0,0,width, height) and xScaleFactor=yScaleFactor=2. After scaling, the image will be of size (2 * width, 2 * height). My question is: is pixel (0, 0) at the top left corner of the scaled image? Let me rephrase my question: when you specify a roi for a image, which can be srcROI for pSrc and destROI for pDest, it is always specified in the coordinate system attached to the associated image. Am I right?<BR />In other words, if pSrc = srcROI = (0,0,128,128) and xScaleFactor=yScaleFactor=2 and pDestROI = (0,0,128,128), the result will be the top left quarter of the scaled image. Is my understanding right? <BR /><BR />Now question for ippiResizeCenter. The Intel doc says:<BR /><BR />xCenter, yCenter Coordinates of the point that does not shift after resizing<BR /><BR />What does this mean? What coordinate system is used to specify xCenter and yXenter? Why are they double instead of integer? I thought coordinates in an image are always pixel coordinates, which are always integer.<BR /><BR />Could somebody please enlighten me? Thanks in advance. Mon, 09 May 2005 09:32:16 GMT axu 2005-05-09T09:32:16Z https://community.intel.com/t5/Intel-Integrated-Performance/ippiResize-and-ippiResizeCenter-usage/m-p/991133#M22326 Hi,<BR /><BR />I have several questions related to ippiResize and ippiResizeCenter.<BR /><BR />ippiResize_8u_C1R(const Ipp8u* pSrc, IppiSize srcSize, int srcStep, IppiRect srcROI,<BR /> Ipp8u* pDst, int dstStep, IppiSize dstRoiSize,<BR /> double xFactor, double yFactor, int interpolation)<BR /><BR />ippiResizeCenter_8u_C1R(const Ipp8u* pSrc, IppiSize srcSize, int srcStep, IppiRect srcRoi,<BR /><BR /> Ipp8u* pDst, int dstStep, IppiSize dstRoiSize,<BR /><BR /> double xFactor, double yFactor,<BR /><BR /> double xCenter, double yCenter, int interpolation);<BR /><BR />My question is essentially a question on coordinate systems used.<BR />Let's start with ippiResize with roi= (0,0,width, height) and xScaleFactor=yScaleFactor=2. After scaling, the image will be of size (2 * width, 2 * height). My question is: is pixel (0, 0) at the top left corner of the scaled image? Let me rephrase my question: when you specify a roi for a image, which can be srcROI for pSrc and destROI for pDest, it is always specified in the coordinate system attached to the associated image. Am I right?<BR />In other words, if pSrc = srcROI = (0,0,128,128) and xScaleFactor=yScaleFactor=2 and pDestROI = (0,0,128,128), the result will be the top left quarter of the scaled image. Is my understanding right? <BR /><BR />Now question for ippiResizeCenter. The Intel doc says:<BR /><BR />xCenter, yCenter Coordinates of the point that does not shift after resizing<BR /><BR />What does this mean? What coordinate system is used to specify xCenter and yXenter? Why are they double instead of integer? I thought coordinates in an image are always pixel coordinates, which are always integer.<BR /><BR />Could somebody please enlighten me? Thanks in advance. Mon, 09 May 2005 09:32:16 GMT https://community.intel.com/t5/Intel-Integrated-Performance/ippiResize-and-ippiResizeCenter-usage/m-p/991133#M22326 axu 2005-05-09T09:32:16Z https://community.intel.com/t5/Intel-Integrated-Performance/ippiResize-and-ippiResizeCenter-usage/m-p/991134#M22327 <DIV>To get clarification, you may submit an issue to Intel Premier Support where our support staff will provide assistance for your issue.</DIV> <DIV>Thanks,<BR />Ying S<BR />Intel IPP </DIV> Sat, 21 May 2005 03:38:58 GMT https://community.intel.com/t5/Intel-Integrated-Performance/ippiResize-and-ippiResizeCenter-usage/m-p/991134#M22327 Ying_S_Intel 2005-05-21T03:38:58Z