ippiFilterPrewittHorizBorder_32f_C1R

[Kim9]

Need to use,

ippiFilterPrewittHorizBorder_32f_C1R, 

tried it one of sample program, but it always gives One or more input pointers are NULL error.

Validated src & dst images & roi as well.

int main() {
    // Define image dimensions
    const int width = 512;
    const int height = 512;

    // Allocate memory for source and destination images
    Ipp32f* psrc=new (std::nothrow) Ipp32f[width * height]; // Source image (grayscale)
    Ipp32f* pDst = new (std::nothrow) Ipp32f[width * height]; // Destination image (filtered)

    // Check for memory allocation success
    if (psrc== nullptr) {
        std::cerr << "Memory allocation for source image failed!" << std::endl;
        return -1;
    }
    if (pDst == nullptr) {
        std::cerr << "Memory allocation for destination image failed!" << std::endl;
        delete[] pSrc;  // Clean up previously allocated memory
        return -1;
    }

    // Initialize source image with some data (example: simple gradient)
    for (int i = 0; i < height; ++i) {
        for (int j = 0; j < width; ++j) {
            pSrc[i * width + j] = static_cast<Ipp32f>((j + i) % 256); // Simple data initialization
        }
    }

    // Define region of interest
    IppiSize roiSize = {width, height}; // Full image
    int srcStep = width * sizeof(Ipp32f); // Step size in bytes for source image
    int dstStep = width * sizeof(Ipp32f); // Step size in bytes for destination image

    // Check ROI dimensions and step sizes
    std::cout << "ROI Size: " << roiSize.width << "x" << roiSize.height << std::endl;
    std::cout << "Source Step: " << srcStep << ", Destination Step: " << dstStep << std::endl;

    // Apply the Prewitt horizontal filter
    IppStatus status = ippiFilterPrewittHorizBorder_32f_C1R(
        pSrc,                 // Source pointer
        srcStep,             // Source step
        pDst,                 // Destination pointer
        dstStep,             // Destination step
        roiSize,             // ROI size
        ippMskSize3x3,
        ippBorderConst,      // Border type
        0.0f,                 // Constant border value
        nullptr
     );

    // Check for errors
    if (status != ippStsNoErr) {
        std::cerr << "Error applying Prewitt horizontal filter: " << status << std::endl;
        // Output additional debugging information
        switch (status) {
            case ippStsNullPtrErr:
                std::cerr << "One or more input pointers are NULL." << std::endl;
                break;
            case ippStsSizeErr:
                std::cerr << "ROI size is incorrect." << std::endl;
                break;
            case ippStsStepErr:
                std::cerr << "Step size is incorrect." << std::endl;
                break;
            default:
                std::cerr << "An unexpected error occurred." << std::endl;
        }
    } else {
        std::cout << "Prewitt horizontal filter applied successfully!" << std::endl;
    }

    // Clean up
    delete[] pSrc;
    delete[] pDst;

    return 0;
}

[Chao_Y_Intel]

Hi, 

have you got chance to check our sample at here?  

FilterPrewittHorizBorder

Before using this function, y, it need to allocate a buffer,  it needs to use  FilterPrewittHorizBorderGetBufferSize  to get the buffer size, and then use provide the buffer for this function.  In the code before, only a NULL pointer is provided.

thanks,
Chao