【求助】YUV格式转RGB
R=Y+1.140V
G=Y-0.395U-V
B=Y+2.032U
Y取值[16,235],UV取值[16,240]
照这个取值那么计算出来的RGB范围不就>255了么?
我认为的解决方案:
1：大于255按255计
2：归一化
请问有哪位知道怎么处理丫，求救
网上有具体的转换方法，可以找找，以前也遇到这问题，后来就用网上的办法解决的
刚刚才学摄像头，目前还不能解答你这个问题。学完了应该可以解答了
public class YuvToRGB {
private static int R = 0;
private static int G = 1;
private static int B = 2;
//I420是yuv420格式，是3个plane，排列方式为(Y)(U)(V)
public static int[] I420ToRGB(byte[] src, int width, int height){
int numOfPixel = width * height;
int positionOfV = numOfPixel;
int positionOfU = numOfPixel/4 + numOfPixel;
int[] rgb = new int[numOfPixel*3];
for(int i=0; i<height; i++){
int startY = i*width;
int step = (i/2)*(width/2);
int startU = positionOfV + step;
int startV = positionOfU + step;
for(int j = 0; j < width; j++){
int Y = startY + j;
int U = startU + j/2;
int V = startV + j/2;
int index = Y*3;
RGB tmp = yuvTorgb(src[Y], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
}
}
return rgb;
}
private static class RGB{
public int r, g, b;
}
private static RGB yuvTorgb(byte Y, byte U, byte V){
RGB rgb = new RGB();
rgb.r = (int)((Y&0xff) + 1.4075 * ((V&0xff)-128));
rgb.g = (int)((Y&0xff) - 0.3455 * ((U&0xff)-128) - 0.7169*((V&0xff)-128));
rgb.b = (int)((Y&0xff) + 1.779 * ((U&0xff)-128));
rgb.r =(rgb.r<0? 0: rgb.r>255? 255 : rgb.r);
rgb.g =(rgb.g<0? 0: rgb.g>255? 255 : rgb.g);
rgb.b =(rgb.b<0? 0: rgb.b>255? 255 : rgb.b);
return rgb;
}
//YV16是yuv422格式，是三个plane，(Y)(U)(V)
public static int[] YV16ToRGB(byte[] src, int width, int height){
int numOfPixel = width * height;
int positionOfU = numOfPixel;
int positionOfV = numOfPixel/2 + numOfPixel;
int[] rgb = new int[numOfPixel*3];
for(int i=0; i<height; i++){
int startY = i*width;
int step = i*width/2;
int startU = positionOfU + step;
int startV = positionOfV + step;
for(int j = 0; j < width; j++){
int Y = startY + j;
int U = startU + j/2;
int V = startV + j/2;
int index = Y*3;
//rgb[index+R] = (int)((src[Y]&0xff) + 1.4075 * ((src[V]&0xff)-128));
//rgb[index+G] = (int)((src[Y]&0xff) - 0.3455 * ((src[U]&0xff)-128) - 0.7169*((src[V]&0xff)-128));
//rgb[index+B] = (int)((src[Y]&0xff) + 1.779 * ((src[U]&0xff)-128));
RGB tmp = yuvTorgb(src[Y], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
}
}
return rgb;
}
//YV12是yuv420格式，是3个plane，排列方式为(Y)(V)(U)
public static int[] YV12ToRGB(byte[] src, int width, int height){
int numOfPixel = width * height;
int positionOfV = numOfPixel;
int positionOfU = numOfPixel/4 + numOfPixel;
int[] rgb = new int[numOfPixel*3];
for(int i=0; i<height; i++){
int startY = i*width;
int step = (i/2)*(width/2);
int startV = positionOfV + step;
int startU = positionOfU + step;
for(int j = 0; j < width; j++){
int Y = startY + j;
int V = startV + j/2;
int U = startU + j/2;
int index = Y*3;
//rgb[index+R] = (int)((src[Y]&0xff) + 1.4075 * ((src[V]&0xff)-128));
//rgb[index+G] = (int)((src[Y]&0xff) - 0.3455 * ((src[U]&0xff)-128) - 0.7169*((src[V]&0xff)-128));
//rgb[index+B] = (int)((src[Y]&0xff) + 1.779 * ((src[U]&0xff)-128));
RGB tmp = yuvTorgb(src[Y], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
}
}
return rgb;
}
//YUY2是YUV422格式，排列是(YUYV)，是1 plane
public static int[] YUY2ToRGB(byte[] src, int width, int height){
int numOfPixel = width * height;
int[] rgb = new int[numOfPixel*3];
int lineWidth = 2*width;
for(int i=0; i<height; i++){
int startY = i*lineWidth;
for(int j = 0; j < lineWidth; j+=4){
int Y1 = j + startY;
int Y2 = Y1+2;
int U = Y1+1;
int V = Y1+3;
int index = (Y1>>1)*3;
RGB tmp = yuvTorgb(src[Y1], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
index += 3;
tmp = yuvTorgb(src[Y2], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
}
}
return rgb;
}
//UYVY是YUV422格式，排列是(UYVY)，是1 plane
public static int[] UYVYToRGB(byte[] src, int width, int height){
int numOfPixel = width * height;
int[] rgb = new int[numOfPixel*3];
int lineWidth = 2*width;
for(int i=0; i<height; i++){
int startU = i*lineWidth;
for(int j = 0; j < lineWidth; j+=4){
int U = j + startU;
int Y1 = U+1;
int Y2 = U+3;
int V = U+2;
int index = (U>>1)*3;
RGB tmp = yuvTorgb(src[Y1], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
index += 3;
tmp = yuvTorgb(src[Y2], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
}
}
return rgb;
}
//NV21是YUV420格式，排列是(Y), (VU)，是2 plane
public static int[] NV21ToRGB(byte[] src, int width, int height){
int numOfPixel = width * height;
int positionOfV = numOfPixel;
int[] rgb = new int[numOfPixel*3];
for(int i=0; i<height; i++){
int startY = i*width;
int step = i/2*width;
int startV = positionOfV + step;
for(int j = 0; j < width; j++){
int Y = startY + j;
int V = startV + j/2;
int U = V + 1;
int index = Y*3;
RGB tmp = yuvTorgb(src[Y], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
}
}
return rgb;
}
//NV12是YUV420格式，排列是(Y), (UV)，是2 plane
public static int[] NV12ToRGB(byte[] src, int width, int height){
int numOfPixel = width * height;
int positionOfU = numOfPixel;
int[] rgb = new int[numOfPixel*3];
for(int i=0; i<height; i++){
int startY = i*width;
int step = i/2*width;
int startU = positionOfU + step;
for(int j = 0; j < width; j++){
int Y = startY + j;
int U = startU + j/2;
int V = U + 1;
int index = Y*3;
RGB tmp = yuvTorgb(src[Y], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
}
}
return rgb;
}
//NV16是YUV422格式，排列是(Y), (UV)，是2 plane
public static int[] NV16ToRGB(byte[] src, int width, int height){
int numOfPixel = width * height;
int positionOfU = numOfPixel;
int[] rgb = new int[numOfPixel*3];
for(int i=0; i<height; i++){
int startY = i*width;
int step = i*width;
int startU = positionOfU + step;
for(int j = 0; j < width; j++){
int Y = startY + j;
int U = startU + j/2;
int V = U + 1;
int index = Y*3;
RGB tmp = yuvTorgb(src[Y], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
}
}
return rgb;
}
//NV61是YUV422格式，排列是(Y), (VU)，是2 plane
public static int[] NV61ToRGB(byte[] src, int width, int height){
int numOfPixel = width * height;
int positionOfV = numOfPixel;
int[] rgb = new int[numOfPixel*3];
for(int i=0; i<height; i++){
int startY = i*width;
int step = i*width;
int startV = positionOfV + step;
for(int j = 0; j < width; j++){
int Y = startY + j;
int V = startV + j/2;
int U = V + 1;
int index = Y*3;
RGB tmp = yuvTorgb(src[Y], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
}
}
return rgb;
}
//YVYU是YUV422格式，排列是(YVYU)，是1 plane
public static int[] YVYUToRGB(byte[] src, int width, int height){
int numOfPixel = width * height;
int[] rgb = new int[numOfPixel*3];
int lineWidth = 2*width;
for(int i=0; i<height; i++){
int startY = i*lineWidth;
for(int j = 0; j < lineWidth; j+=4){
int Y1 = j + startY;
int Y2 = Y1+2;
int V = Y1+1;
int U = Y1+3;
int index = (Y1>>1)*3;
RGB tmp = yuvTorgb(src[Y1], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
index += 3;
tmp = yuvTorgb(src[Y2], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
}
}
return rgb;
}
//VYUY是YUV422格式，排列是(VYUY)，是1 plane
public static int[] VYUYToRGB(byte[] src, int width, int height){
int numOfPixel = width * height;
int[] rgb = new int[numOfPixel*3];
int lineWidth = 2*width;
for(int i=0; i<height; i++){
int startV = i*lineWidth;
for(int j = 0; j < lineWidth; j+=4){
int V = j + startV;
int Y1 = V+1;
int Y2 = V+3;
int U = V+2;
int index = (U>>1)*3;
RGB tmp = yuvTorgb(src[Y1], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
index += 3;
tmp = yuvTorgb(src[Y2], src[U], src[V]);
rgb[index+R] = tmp.r;
rgb[index+G] = tmp.g;
rgb[index+B] = tmp.b;
}
}
return rgb;
}
}