problem about usage of ippiRotateCenter

Kadir_Kirtac — Tue, 31 May 2011 19:16:55 GMT

Hello, I want to rotate an image on its center. I am trying to use ippiRotateCenter. The below code I have written does not perform what I expect. I also attach the input image, the result I get with the below code and the result of matlab's imrotate function. I think matlab's result is ideal. Any idea is welcome.

[bash]    int inputWidth = 512;
    int inputHeight = 512;
    int rotWidth = 725;
    int rotHeight = 725;
    
    double angle = 45.0;

    int stepBytesRot;
    Ipp32f* inputRotated = ippiMalloc_32f_C1(rotWidth, rotHeight, &stepBytesRot);
    IppiSize srcSize = { inputWidth, inputHeight }, dstSize = { rotWidth, rotHeight };

    double xCenter = floor((double)inputWidth/2);
    double yCenter = floor((double)inputHeight/2);

    IppiRect srcRect = { 0, 0, inputWidth, inputHeight};
    IppiRect dstRect = { 0, 0, rotWidth, rotHeight};
    
    int interpolationType = IPPI_INTER_NN;

    sts = ippiRotateCenter_32f_C1R(inputImage, srcSize, stepBytesInput, srcRect,
        inputRotated, stepBytesRot, dstRect,
        -angle, xCenter, yCenter, interpolationType);

    assert(sts!=ippStsNullPtrErr); assert(sts!=ippStsSizeErr); assert(sts!=ippStsStepErr);
    assert(sts!=ippStsInterpolationErr); assert(sts!=ippStsRectErr); assert(sts!=ippStsWrongIntersectQuad);[/bash]

problem about usage of ippiRotateCenter

Yuri_Tikhomirov__Int — Thu, 02 Jun 2011 15:08:41 GMT

Hi Kadir,

The example from IPP Reference Manual will help you. Please look at the attached file.
You should to recalculate dstRect and parameters xShift and yShift using auxiliary functions before call of the function ippiRotate.

Thanks,
Beg

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problem about usage of ippiRotateCenter