我USB摄像头采集的到数据是YUV422,显示的话要转成RGB565，看了很多资料，都不明白怎么转的，，谁知道哪有这方面的有用的资料或源码，，我参考一下

RGB565的意思是，16位表示，5位R，6位G，5位B；
    转换的公式是，如果，R、G、B的值域为[0,1]，转成实数：
Y=0.299R+0.587G+0.114B           0<Y<1
Cb=-0.169R-0.331G+0.5G           -0.5<G<0.5
Cr=0.5R-0.419g-0.081B            -0.5<B<0.5
    如果，R、G、B的值域为[0,1]，转成二进制：
Y=65.481R+128.553G+24.966B+16        16<Y<235
Cb=-37.797R-74.203G+112G+128         -112<G<112
Cr=112R-93.786g-18.214B+128          -112<B<112
   当你的数值范围不同时，做个系数变换就行了。 #define  RGB(v) ({    \
    int value = (v); \
    (value > 0) * value | (255 * (value > 255));\
})

YUV444toRGB888 :
y = img[0];
u = img[1];
v = img[2];
r = RGB(y + v + (v >> 2) + (v >> 3) + (v >> 5));
g = RGB(y - ((u >> 2) + (u >> 4) + (u >> 5)) - ((v >> 1) + (v >> 3) + (v >> 4) + (v >> 5)));
b = RGB(y + u + (u >> 1) + (u >> 2) + (u >> 6));

YUV422toRGB888:
y1 = img[0];
u = img[1];
y2 = img[2];
v = img[3];
rgb1 = YUV444toRGB888(y1, u, v);
rgb2 = YUV444toRGB888(y2, u, v);

YUV411toRGB888:
u  = img[0];
y1 = img[1];
y2 = img[2];
v  = img[3];
y3 = img[4];
y4 = img[5];
rgb1 = YUV444toRGB888(y1, u, v);
rgb2 = YUV444toRGB888(y2, u, v);
rgb3 = YUV444toRGB888(y3, u, v);
rgb4 = YUV444toRGB888(y4, u, v);

YUV420toRGB888:
total = width * height;
y = img[py * width + px];
u = img[(py / 2) * (width / 2) + (px / 2) + total];
v = img[(py / 2) * (width / 2) + (px / 2) + total + (total / 4)];
rgb = YUV444toRGB888(y, u, v);