2017-03-16 01:34:52 -0500 asked a question Opencl computation time increases after few iterations I am using opencl module provided by opencv on Qualcomm Snapdragon 805 Inforce 6501.The problem is that the time taken for the execution of opencv's remap function with oclMat after about 20 iterations is around 700 microseconds but if I call it for 50 iteration or more execution time rises to 50ms after about 30 iterations. The code i am using is as follows Mat xMap1,yMap1,mDst; Mat xMap2,yMap2; Mat xMap3,yMap3; bool first = true; oclMat osXMap,osYMap; oclMat conSrc; oclMat conDst; oclMat oclXMap,oclYMap; oclMat oclSrc; oclMat oclDst1; oclMat oclDst2; Mat imageSrc = cv::imread("/storage/sdcard0/DCIM/Camera/2048.jpg"); FileStorage fsx("/storage/sdcard0/DCIM/Camera/FishEyeConversionXmap4.yml",FileStorage::READ); FileStorage fsy("/storage/sdcard0/DCIM/Camera/FishEyeConversionYmap4.yml",FileStorage::READ); fsx["xMap"] >> xMap1; fsy["yMap"] >> yMap1; fsx.release(); fsy.release(); oclSrc = imageSrc; oclDst1 = oclSrc.clone(); oclDst2 = oclSrc.clone(); oclXMap= xMap1; oclYMap= yMap1; cout<<"Remaping\n"; for(int i=0; i<50; i++) //while(1) { unsigned long long t1 = GetTime(); remap(oclSrc,oclDst1,oclXMap,oclYMap,CV_INTER_LINEAR,BORDER_CONSTANT); remap(oclSrc,oclDst2,oclXMap,oclYMap,CV_INTER_LINEAR,BORDER_CONSTANT); unsigned long long t2 = GetTime(); printf("%d Time taken remap : %llu microseconds for %f ms\n",i, t2-t1,(float)((t2-t1)/(1000))); }  And this is the output I get. 0 Time taken remap : 11946 microseconds for 11.000000 ms 1 Time taken remap : 817 microseconds for 0.000000 ms 2 Time taken remap : 800 microseconds for 0.000000 ms 3 Time taken remap : 258 microseconds for 0.000000 ms 4 Time taken remap : 754 microseconds for 0.000000 ms 5 Time taken remap : 885 microseconds for 0.000000 ms 6 Time taken remap : 764 microseconds for 0.000000 ms 7 Time taken remap : 966 microseconds for 0.000000 ms 8 Time taken remap : 783 microseconds for 0.000000 ms 9 Time taken remap : 757 microseconds for 0.000000 ms 10 Time taken remap : 1050 microseconds for 1.000000 ms 11 Time taken remap : 445 microseconds for 0.000000 ms 12 Time taken remap : 798 microseconds for 0.000000 ms 13 Time taken remap : 758 microseconds for 0.000000 ms 14 Time taken remap : 765 microseconds for 0.000000 ms 15 Time taken remap : 978 microseconds for 0.000000 ms 16 Time taken remap : 1120 microseconds for 1.000000 ms 17 Time taken remap : 763 microseconds for 0.000000 ms 18 Time taken remap : 766 microseconds for 0.000000 ms 19 Time taken remap : 607 microseconds for 0.000000 ms 20 Time taken remap : 258 microseconds for 0.000000 ms 21 Time taken remap : 305 microseconds for 0.000000 ms 22 Time taken remap : 767 microseconds for 0.000000 ms 23 Time taken remap : 750 microseconds for 0.000000 ms 24 Time taken remap : 783 microseconds for 0.000000 ms 25 Time taken remap : 769 microseconds for 0.000000 ms 26 Time taken remap : 782 microseconds for 0.000000 ms 27 Time taken remap : 4588 microseconds for 4.000000 ms 28 Time taken remap : 301 microseconds for 0.000000 ms 29 Time taken remap ... 2016-08-18 00:29:30 -0500 asked a question Stitching Detailed: Warp one image with respect to the second and keep the second image unmodified I am using opencv stitching detailed example as reference for my project in which if I provide two images to create a panorama then both are warped to match each other, is there a way in which one image could remain unmodified and second image should be warped to match the first one.