RGB、YUV420p、YUV420sp之间的互相转换（C++）

关于RGB、YUV介绍可以参考 RGB 与YUV颜色模型及存储格式

1.covert RGB to NV21

void encodeYUV420sp(unsigned  char* yuv420sp, unsigned char* rgb, int width, int height)
{if (yuv420sp == NULL || rgb == NULL)return;int frameSize = width*height;int yIndex = 0;int uvIndex = frameSize;int R, G, B, Y, U, V;for (int i = 0; i < height; i++){for (int j = 0; j < width; j++){B = rgb[(i * width + j) * 3 + 0];G = rgb[(i * width + j) * 3 + 1];R = rgb[(i * width + j) * 3 + 2];//RGB to YUVY = ((66 * R + 129 * G + 25 * B + 128) >> 8) + 16;U = ((-38 * R - 74 * G + 112 * B + 128) >> 8) + 128;V = ((112 * R - 94 * G - 18 * B + 128) >> 8) + 128;yuv420sp[yIndex++] = (unsigned char)((Y < 0) ? 0 : ((Y > 255) ? 255 : Y));if (i % 2 == 0 && j % 2 == 0){yuv420sp[uvIndex++] = (unsigned char)((V < 0) ? 0 : ((V > 255) ? 255 : V));yuv420sp[uvIndex++] = (unsigned char)((U < 0) ? 0 : ((U > 255) ? 255 : U));}}}
}

2.covert RGB to YU12(I420)

void rgb_to_yuv420p(unsigned  char* yuv420p, unsigned char* rgb, int width, int height)
{if (yuv420p == NULL || rgb == NULL)return;int frameSize = width*height;int chromaSize = frameSize / 4;int yIndex = 0;int uIndex = frameSize;int vIndex = frameSize + chromaSize;int R, G, B, Y, U, V;for (int i = 0; i < height; i++){for (int j = 0; j < width; j++){B = rgb[(i * width + j) * 3 + 0];G = rgb[(i * width + j) * 3 + 1];R = rgb[(i * width + j) * 3 + 2];//RGB to YUVY = ((66 * R + 129 * G + 25 * B + 128) >> 8) + 16;U = ((-38 * R - 74 * G + 112 * B + 128) >> 8) + 128;V = ((112 * R - 94 * G - 18 * B + 128) >> 8) + 128;yuv420p[yIndex++] = (unsigned char)((Y < 0) ? 0 : ((Y > 255) ? 255 : Y));if (i % 2 == 0 && j % 2 == 0){yuv420p[uIndex++] = (unsigned char)((U < 0) ? 0 : ((U > 255) ? 255 : U));yuv420p[vIndex++] = (unsigned char)((V < 0) ? 0 : ((V > 255) ? 255 : V));}}}
}

3.covert NV21 to YU12（I420）

void yuv420sp_to_yuv420p(unsigned char* yuv420p,  unsigned char* yuv420sp, int width, int height) {if (yuv420sp == NULL || yuv420p == NULL)return;int framesize = width * height;int i = 0, j = 0;//copy Yfor (i = 0; i < framesize; i++) {*(yuv420p + i) = *(yuv420sp + i);}//copy Ui = 0;for (j = 1; j < framesize / 2; j += 2) {*(yuv420p + (i + framesize)) = *(yuv420sp + (j + framesize));i++;}//copy Vi = 0;for (j = 0; j < framesize / 2; j += 2) {*(yuv420p + (i + framesize * 5 / 4)) = *(yuv420sp + (j + framesize));i++;}
}

YUV其他存储格式的转换把上面的函数在UV赋值时变通一下即可。

测试

测试图片：

#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/imgproc.hpp>
#include <iostream>using namespace std;
using namespace cv;// show image
void showImage(String windowName, Mat img, int flag = 1)
{namedWindow(windowName, flag);//0: CV_WINDOW_NORMAL 1: WINDOW_AUTOSIZEimshow(windowName, img);waitKey(0);//destroyWindow(windowName);
}int main()
{Mat img_eye = imread("Sharingan_1.jpg");showImage("img_eye", img_eye);int height = img_eye.rows;int width = img_eye.cols;unsigned char* img_eye_bgr_data = (unsigned char*)malloc(height*width * 3 * sizeof(unsigned char));for (int i = 0; i < height; i++){unsigned char* current_row = img_eye.ptr<uchar>(i);for (int j = 0; j < width; j++){img_eye_bgr_data[(i * width + j) * 3 + 0] = current_row[j * 3 + 0];//Bimg_eye_bgr_data[(i * width + j) * 3 + 1] = current_row[j * 3 + 1];//Gimg_eye_bgr_data[(i * width + j) * 3 + 2] = current_row[j * 3 + 2];//R}}// 1. RGB covert to NV21unsigned char* img_eye_nv21_data = (unsigned char*)malloc(height*width * 3 / 2 * sizeof(unsigned char));encodeYUV420sp(img_eye_nv21_data, img_eye_bgr_data, width, height);Mat img_eye_nv21(height * 3 / 2, width, CV_8UC1, img_eye_nv21_data);// test Mat img_BGR(height, width, CV_8UC3);cvtColor(img_eye_nv21, img_BGR, CV_YUV2BGR_NV21);//CV_YUV420sp2BGRshowImage("img_BGR", img_BGR);// 2. RGB covert to YU12//类似，略去，使用CV_YUV2BGR_I420)或者CV_YUV2BGR_IYUV// 3. NV21 covert to YU12(I420)//类似，略去，return 0;
}

提示：如果把YUV420p的YU12和YV12或者被YUV420sp的NV12和NV21搞颠倒了，图片的红色和蓝色会颠倒。

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RGB、YUV420p、YUV420sp之间的互相转换（C++）

1.covert RGB to NV21

2.covert RGB to YU12(I420)

3.covert NV21 to YU12（I420）

测试

RGB、YUV420p、YUV420sp之间的互相转换（C++）相关推荐

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