[英]Resize YUV byte array image to a specific width and height
I'm trying to find a method, way or kind of algorithm to downsize YUV images to an specific width and height values without converting it into RGB, just manipulating the byte[]
of my YUV image
. 我正在尝试找到一种方法,方法或某种算法,可以将YUV图像缩小到特定的宽度和高度值,而无需将其转换为RGB,而只需操纵
YUV image
的byte[]
。
I just found another topics about this as Resize (downsize) YUV420sp image 我刚刚发现了另一个与此相关的主题,如调整大小(缩小)YUV420sp图像
I see that the way to achieve this is removing pixels, but I can just do it always using a factor of 4 because chroma pixels are shared between 4 luma pixels. 我看到实现此目的的方法是删除像素,但是我总是可以使用4倍来完成此操作,因为色度像素在4个亮度像素之间共享。
After researching I just achieve the next method, which rescale a YUV image
four times smaller than the original image, but want I want to achieve is freely convert from a Width x Height resolution
to a smaller one that I want, not a factor of 4. It is possible to achieve this in some way? 经过研究,我只是实现了下一个方法,该方法将
YUV image
重新缩放为原始图像的四倍,但是我想要实现的是将Width x Height resolution
自由转换为我想要的较小Width x Height resolution
,而不是4倍有可能以某种方式实现这一目标吗? I don't have problems in use Renderscript or any kind of libraries. 使用Renderscript或任何类型的库我都没有问题。
/**
* Rescale a YUV image four times smaller than the original image for faster processing.
*
* @param data Byte array of the original YUV image
* @param imageWidth Width in px of the original YUV image
* @param imageHeight Height in px of the original YUV image
* @return Byte array containing the downscaled YUV image
*/
public static byte[] quadYuv420(byte[] data, int imageWidth, int imageHeight) {
Log.v(TAG, "[quadYuv420] receiving image with " + imageWidth + "x" + imageHeight);
long startingTime = System.currentTimeMillis();
byte[] yuv = new byte[imageWidth / 8 * imageHeight / 8 * 3 / 2];
// process Y component
int i = 0;
for (int y = 0; y < imageHeight; y += 8) {
for (int x = 0; x < imageWidth; x += 8) {
yuv[i] = data[y * imageWidth + x];
i++;
}
}
// process U and V color components
for (int y = 0; y < imageHeight / 2; y += 8) {
for (int x = 0; x < imageWidth; x += 16) {
if (i < yuv.length) {
yuv[i] = data[(imageWidth * imageHeight) + (y * imageWidth) + x];
i++;
yuv[i] = data[(imageWidth * imageHeight) + (y * imageWidth) + (x + 1)];
i++;
}
}
}
Log.v(TAG, "[quadYuv420] Rescaled YUV420 in " + (System.currentTimeMillis() - startingTime) + "ms");
return yuv;
}
Take a look at libyuv https://chromium.googlesource.com/libyuv/libyuv/ 看看libyuv https://chromium.googlesource.com/libyuv/libyuv/
You may need to write a jni wrapper and convert the yuv to planar using the convert functions included in the project - https://chromium.googlesource.com/libyuv/libyuv/+/master/include/libyuv/convert.h 您可能需要编写JNI封装和转换YUV使用包含在项目中的转换功能,以平面- https://chromium.googlesource.com/libyuv/libyuv/+/master/include/libyuv/convert.h
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