在 OpenCV 中将 `BufferedImage` 转换为 `Mat` [英] Converting `BufferedImage` to `Mat` in OpenCV

问题描述

如何将 BufferedImage 转换为 OpenCV 中的 Mat?

How can I convert a BufferedImage to a Mat in OpenCV?

我正在使用 OpenCV 的 JAVA 包装器(不是 JavaCV).由于我是 OpenCV 的新手，我在理解 Mat 的工作原理时遇到了一些问题.

I'm using the JAVA wrapper for OpenCV(not JavaCV). As I am new to OpenCV I have some problems understanding how Mat works.

我想做这样的事情.(基于 Ted W. 的回复):

I want to do something like this. (Based on Ted W. reply):

BufferedImage image = ImageIO.read(b.getClass().getResource("Lena.png"));

int rows = image.getWidth();
int cols = image.getHeight();
int type = CvType.CV_16UC1;
Mat newMat = new Mat(rows, cols, type);

for (int r = 0; r < rows; r++) {
    for (int c = 0; c < cols; c++) {
        newMat.put(r, c, image.getRGB(r, c));
    }
}

Highgui.imwrite("Lena_copy.png", newMat);

这不起作用.Lena_copy.png 只是一张尺寸正确的黑色图片.

This doesn't work. Lena_copy.png is just a black picture with the correct dimensions.

推荐答案

我也试图做同样的事情，因为需要将处理过的图像与两个库结合起来.我尝试做的是将 byte[] 放入 Mat 而不是 RGB 值.它奏效了！所以我所做的是:

I also was trying to do the same thing, because of need to combining image processed with two libraries. And what I’ve tried to do is to put byte[] in to Mat instead of RGB value. And it worked! So what I did was:

1.Converted BufferedImage 到字节数组:

1.Converted BufferedImage to byte array with:

byte[] pixels = ((DataBufferByte) image.getRaster().getDataBuffer()).getData();

2.然后，如果您将 type 设置为 CV_8UC3

2. Then you can simply put it to Mat if you set type to CV_8UC3

image_final.put(0, 0, pixels);

您也可以尝试按照 这个答案

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