Question

目前我有以下内容：

[cameraFeed] - ＆gt; [gaussianBlur] - ＆gt; [sobel] - ＆gt; [brightnessThreshold] - ＆gt; [rawDataOutput]

rawDataOuput我想将它传递给OpenCV findCountours函数。不幸的是，我无法找到正确的方法来做到这一点。以下是获取rawDataOuput并应将其传递给OpenCV函数的回调块，但它不起作用。我假设有一些涉及的事情，如将GPUImage给出的BGRA图像转换为CV_8UC1（单通道），但我无法弄清楚它们。非常感谢一些帮助，谢谢！

    // Callback on raw data output
    __weak GPUImageRawDataOutput *weakOutput = rawDataOutput;
    [rawDataOutput setNewFrameAvailableBlock:^{
        [weakOutput lockFramebufferForReading];
        GLubyte *outputBytes = [weakOutput rawBytesForImage];
        NSInteger bytesPerRow = [weakOutput bytesPerRowInOutput];
        // OpenCV stuff
        int width = videoSize.width;
        int height = videoSize.height;
        size_t step = bytesPerRow;
        cv::Mat mat(height, width, CV_8UC1, outputBytes, step); // outputBytes should be converted to type CV_8UC1
        cv::Mat workingCopy = mat.clone();

        // PASS mat TO OPENCV FUNCTION!!!

        [weakOutput unlockFramebufferAfterReading];
        // Update rawDataInput if we want to display the result
        [rawDataInput updateDataFromBytes:outputBytes size:videoSize];
        [rawDataInput processData];
    }];

Answer 1

尝试将CV_8UC1更改为CV_8UC4，然后转换为灰色。在代码替换行

cv::Mat mat(height, width, CV_8UC1, outputBytes, step);
cv::Mat workingCopy = mat.clone();

与

cv::Mat mat(height, width, CV_8UC4, outputBytes, step);
cv::Mat workingCopy;
cv::cvtColor(mat, workingCopy, CV_RGBA2GRAY);

如何将GPUImage rawDataOutput的输出提供给OpenCV findCountours函数

1 个答案: