NV16和BGR相互转换C++实现

一、NV16格式

Y分量单独存放，UV分量交错存放（先U后V），2个Y共用1个UV，总长度为W×H×2。通道数为2，平均每个像素占16位，故称NV16格式。

Y Y Y Y
Y Y Y Y
U V U V
U V U V

二、NV16转BGR

static void NV16_2_BGR(const cv::Mat &yuv_image, unsigned char *buffer) {int bgr_image_width = yuv_image.cols;int bgr_image_height = yuv_image.rows / 2;cv::Mat bgr_image = cv::Mat(bgr_image_height, bgr_image_width, CV_8UC3);int length_y = bgr_image_width * bgr_image_height;int length_uv = length_y >> 1;unsigned char *pt_yuv_y = yuv_image.data;unsigned char *pt_yuv_uv = yuv_image.data + length_y;for (int h = 0; h < bgr_image_height; ++h){cv::Vec3b *pt_bgr_image_line = bgr_image.ptr<cv::Vec3b>(h);unsigned char *pt_yuv_y_line = pt_yuv_y + h * bgr_image_width;unsigned char *pt_yuv_uv_line = pt_yuv_uv + h * bgr_image_width;for (int w = 0; w < bgr_image_width; ++w){unsigned char y, u, v;int b, g, r;y = pt_yuv_y_line[w];if (w%2 == 0){u = pt_yuv_uv_line[w];v = pt_yuv_uv_line[w+1];}if (w%2 == 1){u = pt_yuv_uv_line[w-1];v = pt_yuv_uv_line[w];}r = y + ((360 * (v - 128) + 128) >> 8);g = y - (((88 * (u - 128) + 184 * (v - 128)) - 128) >> 8);b = y + ((455 * (u - 128) + 128) >> 8);if (b < 0)b = 0;if (b > 255)b = 255;if (g < 0)g = 0;if (g > 255)g = 255;if (r < 0)r = 0;if (r > 255)r = 255;pt_bgr_image_line[w][0] = b;pt_bgr_image_line[w][1] = g;pt_bgr_image_line[w][2] = r;}}int length = bgr_image_width*bgr_image_height*3;memcpy(buffer, bgr_image.data, length);
}

三、BGR转NV16

static void BGR_2_NV16(const cv::Mat &bgr_image, unsigned char *buffer) {int bgr_image_width = bgr_image.cols;int bgr_image_height = bgr_image.rows;int length_y = bgr_image_width * bgr_image_height;int length_uv = length_y >> 1;unsigned char *pt_yuv_y = buffer;unsigned char *pt_yuv_uv = buffer + length_y;for (int h = 0; h < bgr_image_height; ++h){const cv::Vec3b *pt_bgr_image_line = bgr_image.ptr<cv::Vec3b>(h);unsigned char *pt_yuv_y_line = pt_yuv_y + h * bgr_image_width;unsigned char *pt_yuv_uv_line = pt_yuv_uv + h * bgr_image_width;for (int w = 0; w < bgr_image_width; ++w){unsigned char b, g, r;int y, u, v;b = pt_bgr_image_line[w][0];g = pt_bgr_image_line[w][1];r = pt_bgr_image_line[w][2];y = (77 * r + 150 * g + 29 * b + 128) >> 8;if (y < 0)y = 0;if (y > 255)y = 255;pt_yuv_y_line[w] = y;if (w%2 == 0){u = ((-44 * r - 87 * g + 131 * b + 128) >> 8) + 128;v = ((131 * r - 110 * g - 21 * b + 128) >> 8) + 128;if (u < 0)u = 0;if (u > 255)u = 255;if (v < 0)v = 0;if (v > 255)v = 255;pt_yuv_uv_line[w] = u;pt_yuv_uv_line[w+1] = v;}}}
}

YUV格式详解参见：YUV 格式详解，只看这一篇就够了（转）

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NV16和BGR相互转换C++实现

一、NV16格式

二、NV16转BGR

三、BGR转NV16

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