Java 解码V420SP单像素版本
我正在尝试将几个像素从YUV nv21图像格式转换为RGB格式是的,只是一些像素,而不是整个图像,因为运行时限制 目前,我正在使用internet上的decodeyuv420SP功能:Java 解码V420SP单像素版本,java,android,image,rgb,yuv,Java,Android,Image,Rgb,Yuv,我正在尝试将几个像素从YUV nv21图像格式转换为RGB格式是的,只是一些像素,而不是整个图像,因为运行时限制 目前,我正在使用internet上的decodeyuv420SP功能: static public void decodeYUV420SP(int[] rgb, byte[] yuv420sp, int width, int height) { final int frameSize = width * height; for (int j = 0,
static public void decodeYUV420SP(int[] rgb, byte[] yuv420sp, int width, int height) {
final int frameSize = width * height;
for (int j = 0, yp = 0; j < height; j++) {
int uvp = frameSize + (j >> 1) * width, u = 0, v = 0;
for (int i = 0; i < width; i++, yp++) {
int y = (0xff & ((int) yuv420sp[yp])) - 16;
if (y < 0) y = 0;
if ((i & 1) == 0) {
v = (0xff & yuv420sp[uvp++]) - 128;
u = (0xff & yuv420sp[uvp++]) - 128;
}
int y1192 = 1192 * y;
int r = (y1192 + 1634 * v);
int g = (y1192 - 833 * v - 400 * u);
int b = (y1192 + 2066 * u);
if (r < 0) r = 0; else if (r > 262143) r = 262143;
if (g < 0) g = 0; else if (g > 262143) g = 262143;
if (b < 0) b = 0; else if (b > 262143) b = 262143;
rgb[yp] = 0xff000000 | ((r << 6) & 0xff0000) | ((g >> 2) & 0xff00) | ((b >> 10) & 0xff);
}
}
}
现在我想做一些修改,它可以返回特定像素x,Y的R,G,B值,
但我不明白它到底是做什么的,看起来一个YUV像素对应多个RGB像素。有人能帮我解决这个问题吗?
谢谢大家! 这只是快速和肮脏,但我认为它会奏效。我所做的就是删除循环,并用给定的X,Y替换它们,在这里表示为行和列,因为我们使用Y来表示其他东西
int uvp = frameSize + (row >> 1) * width, u = 0, v = 0;
int yp = row*width + column;
int y = (0xff & ((int) yuv420sp[yp])) - 16;
if (y < 0) y = 0;
if ((column & 1) == 0) {
v = (0xff & yuv420sp[uvp++]) - 128;
u = (0xff & yuv420sp[uvp++]) - 128;
}
int y1192 = 1192 * y;
int r = (y1192 + 1634 * v);
int g = (y1192 - 833 * v - 400 * u);
int b = (y1192 + 2066 * u);
if (r < 0) r = 0; else if (r > 262143) r = 262143;
if (g < 0) g = 0; else if (g > 262143) g = 262143;
if (b < 0) b = 0; else if (b > 262143) b = 262143;
result = 0xff000000 | ((r << 6) & 0xff0000) | ((g >> 2) & 0xff00) | ((b >> 10) & 0xff);
希望能有帮助