[代码片段]直方图均衡，总觉得有问题

//直方图均衡
void Equalize(u8 **img, u16 height, u16 width)
{
    //循环变量
    u16    i,j;
    
    //临时变量
    u16    lTemp;    
    
    
    //映射表
    u16    bMap[256];
    
    //直方图
    long    lCount[256];
    
    //清零直方图
    for (i = 0; i < 256; i ++)
    {
        lCount[i] = 0;
    }
    
    //直方图统计
    for (i = 0; i < height; i ++)
    {
        for (j = 0; j < width; j ++)
        {
            lCount[img[i][j] ]++;
        }
    }
    
    //计算灰度映射表
    for (i = 0; i < 256; i++)
    {
        lTemp = 0;
        
        for (j = 0; j <= i ; j++)
        {
            lTemp += lCount[j];
        }
        
        //计算映射表
        bMap[i] = (u16) (lTemp * 255 / height / width);
    }
    
    //根据映射表填充图像
    for(i = 0; i < height; i++)
    {
        for(j = 0; j < width; j++)
        {
            //
            img[height - 1 - i][j] = bMap[(height - 1 - i)*width + j];
        }
    }
    
    
}