[英]Convert from YUV to RGB in c++ (android-ndk)
我在android中開發,並希望將字節數組從相機的previewCallback(YUV格式)轉換為rgb格式。
我使用了這個答案中給出的功能: 從Android中的視頻圖像中獲取幀
它在java中完美運行,但我的問題是我想用c ++編寫函數(我使用的是ndk,而不是很熟悉c ++)。
我試圖用c ++創建函數,但它總是會產生奇怪的結果(例如圖片全部為綠色)。
有沒有人有類似的功能或這個功能在c ++中工作?
謝謝。
在C ++中從YUYV轉換為RGB:
unsigned char* rgb_image = new unsigned char[width * height * 3]; //width and height of the image to be converted
int y;
int cr;
int cb;
double r;
double g;
double b;
for (int i = 0, j = 0; i < width * height * 3; i+=6 j+=4) {
//first pixel
y = yuyv_image[j];
cb = yuyv_image[j+1];
cr = yuyv_image[j+3];
r = y + (1.4065 * (cr - 128));
g = y - (0.3455 * (cb - 128)) - (0.7169 * (cr - 128));
b = y + (1.7790 * (cb - 128));
//This prevents colour distortions in your rgb image
if (r < 0) r = 0;
else if (r > 255) r = 255;
if (g < 0) g = 0;
else if (g > 255) g = 255;
if (b < 0) b = 0;
else if (b > 255) b = 255;
rgb_image[i] = (unsigned char)r;
rgb_image[i+1] = (unsigned char)g;
rgb_image[i+2] = (unsigned char)b;
//second pixel
y = yuyv_image[j+2];
cb = yuyv_image[j+1];
cr = yuyv_image[j+3];
r = y + (1.4065 * (cr - 128));
g = y - (0.3455 * (cb - 128)) - (0.7169 * (cr - 128));
b = y + (1.7790 * (cb - 128));
if (r < 0) r = 0;
else if (r > 255) r = 255;
if (g < 0) g = 0;
else if (g > 255) g = 255;
if (b < 0) b = 0;
else if (b > 255) b = 255;
rgb_image[i+3] = (unsigned char)r;
rgb_image[i+4] = (unsigned char)g;
rgb_image[i+5] = (unsigned char)b;
}
此方法假定您的yuyv_image也是unsigned char *。
有關YUYV的更多信息,請點擊此處
有關YUYV的更多說明 - > RGB請查看此內容
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