https://community.intel.com/t5/Intel-Integrated-Performance/Stitching-images/m-p/922462#M15842 Hi there!<BR /><BR />I am using Ipp 5.1 to get several overlapping 24bit rgb images to be merged into a larger image. For this I would like to use a proximity measure function to find the best match between pairs of images, the ippiSqrDistanceFull or ippiCrossCorrFull functions.<BR /><BR />The problem I face is when the overlap is small, then these functions give very unreliable results. The reason is that the images gets a zero-padding. This makes SqrDistance useless of course, while cross correlation functions very rarely finds a good match.<BR /><BR />So I am wondering if I am on the wrong track with using these functions for stitching images? In principle the sqr distance method seems good, but it needs to be on a per-pixel average and disregard any padding, something which IPP cant do. I am working with SqrDistanceValid now instead but overlapping equal sized images this mean many smaller matches instead of one big match.<BR /><BR />Regards<BR />Magnus Fri, 09 Jun 2006 21:21:27 GMT magnussq 2006-06-09T21:21:27Z https://community.intel.com/t5/Intel-Integrated-Performance/Stitching-images/m-p/922462#M15842 Hi there!<BR /><BR />I am using Ipp 5.1 to get several overlapping 24bit rgb images to be merged into a larger image. For this I would like to use a proximity measure function to find the best match between pairs of images, the ippiSqrDistanceFull or ippiCrossCorrFull functions.<BR /><BR />The problem I face is when the overlap is small, then these functions give very unreliable results. The reason is that the images gets a zero-padding. This makes SqrDistance useless of course, while cross correlation functions very rarely finds a good match.<BR /><BR />So I am wondering if I am on the wrong track with using these functions for stitching images? In principle the sqr distance method seems good, but it needs to be on a per-pixel average and disregard any padding, something which IPP cant do. I am working with SqrDistanceValid now instead but overlapping equal sized images this mean many smaller matches instead of one big match.<BR /><BR />Regards<BR />Magnus Fri, 09 Jun 2006 21:21:27 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Stitching-images/m-p/922462#M15842 magnussq 2006-06-09T21:21:27Z https://community.intel.com/t5/Intel-Integrated-Performance/Stitching-images/m-p/922463#M15843 <DIV></DIV><P>Hi, Magnus!</P><P>To use cross corr for your purpose you need compapatively big areas in images to stitch. It can be insufficients if image brightness or other characteristics differ.</P><P>Generally, image stitching (panorame image creation) is done via key points search in images. The most popular are SIFT (scale-invariant...) features. We plan to include functions to cover the most time-consuming part of SIFT algorithm to IPP and to provide the corresponding sample.</P><P>Alexander</P> Sat, 10 Jun 2006 00:28:54 GMT https://community.intel.com/t5/Intel-Integrated-Performance/Stitching-images/m-p/922463#M15843 Intel_C_Intel 2006-06-10T00:28:54Z