[opencv]統計每個像素值的數目

 

int histo[256] = { 0 };//直方圖統計每個像素值的數目
    int width = img.cols, height = img.rows;
    int num_of_pixels = width*height;
    
    //統計每個像素值的數目
    for (int y = 0; y < height; ++y)
    {
        auto *data = new uchar[width * height * 3];
        for (int x = 0; x < width; ++x)
        {
            histo[data[x]] += 1;
        }
    }

    //統計當前像素值和之前像素值的總數
    for (int i = 1; i < 256; ++i)
        histo[i] = histo[i] + histo[i - 1];