https://community.intel.com/t5/Intel-Integrated-Performance/Howto-get-pointer-of-ROI/m-p/851648#M6624 The method of calculating pointer of ROI is given on pp.2-24 of manual with a Document Number A70805-023US as following:<BR />-----------------------------------------------------------------------<BR />pSrc = pSrcImg + 3*(srcImgSize.width * srcRoiOffset.y + srcRoiOffset.x),<BR />-----------------------------------------------------------------------<BR /><BR />I am not quite sure if it is correct. <BR />See, considering step size of the SrcImg nad package of each pixel of the SrcImg, in case that the pixel is packed as<BR /> [R G B][R G B]......<BR />Then the pointer should be <BR /> pSrc = pSrcImg + StepSizeOfSrcImg* srcRoiOffset.y + 3 * srcRoiOffset.x,<BR />Here the StepSizeofSrcImg not necessarily equal with SrcImgSize.width * 3.<BR />Is my understanding right?<BR /><BR />Otherwise if the each channel of the source image is packed seperately as [ R R R R....] [G G G ...] [B B B ... ]<BR />Then the calculation could be much more complicated.<BR /><BR /><BR /><BR /> Fri, 24 Apr 2009 02:54:11 GMT simbalee 2009-04-24T02:54:11Z https://community.intel.com/t5/Intel-Integrated-Performance/Howto-get-pointer-of-ROI/m-p/851648#M6624 The method of calculating pointer of ROI is given on pp.2-24 of manual with a Document Number A70805-023US as following:<BR />-----------------------------------------------------------------------<BR />pSrc = pSrcImg + 3*(srcImgSize.width * srcRoiOffset.y + srcRoiOffset.x),<BR />-----------------------------------------------------------------------<BR /><BR />I am not quite sure if it is correct. <BR />See, considering step size of the SrcImg nad package of each pixel of the SrcImg, in case that the pixel is packed as<BR /> [R G B][R G B]......<BR />Then the pointer should be <BR /> pSrc = pSrcImg + StepSizeOfSrcImg* srcRoiOffset.y + 3 * srcRoiOffset.x,<BR />Here the StepSizeofSrcImg not necessarily equal with SrcImgSize.width * 3.<BR />Is my understanding right?<BR /><BR />Otherwise if the each channel of the source image is packed seperately as [ R R R R....] [G G G ...] [B B B ... ]<BR />Then the calculation could be much more complicated.<BR /><BR /><BR /><BR /> Fri, 24 Apr 2009 02:54:11 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Howto-get-pointer-of-ROI/m-p/851648#M6624 simbalee 2009-04-24T02:54:11Z https://community.intel.com/t5/Intel-Integrated-Performance/Howto-get-pointer-of-ROI/m-p/851649#M6625 <DIV style="margin:0px;"></DIV> Hello,<BR /><BR />yes, your understanding is correct. The sample code in documentation did not take into account that padding may appear at the end of image row. Thanks for pointing to this.<BR /><BR />Regards,<BR /> Vladimir<BR /> Fri, 24 Apr 2009 07:15:44 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Howto-get-pointer-of-ROI/m-p/851649#M6625 Vladimir_Dudnik 2009-04-24T07:15:44Z