在 2D 图像中查找特定颜色

Question

有哪些算法可以检测或查找图像中的特定颜色 (RGB)。检测将被特意用作标记，以找到随后将使用的特定颜色的位置。

Answer 1

如果您知道颜色，您可以直接查找：

C++

glm::vec3 targetColor(1.0f,0,0);//(red,blue,green)
float accepted_color_distance = 0.1f; 
/*how much must look the colors alike? distance 0 means the colors must be equal,
but there are numeric precission problems. Use 0.0001f or 
something instead of 0.*/

bool markersFound[image.rows][image.cols]; //true means pixel y,x is a markers

for(unsigned int a = 0; a < image.rows; a++) //init markersFound with false
{
     for(unsigned int b = 0; b < image.cols; b++)
     { 
         bool markersFound[a][b] = false;
     }
}     

for(unsigned int a = 0; a < image.rows; a++)
{
     for(unsigned int b = 0; b < image.rows; b++)
     { 
       glm::vec3 currentColor = image.at(a,b);
       float color_distance = glm::distance(currentColor, targetColor);

       if(color_distance < accepted_color_distance) //if a marker is found save it
       {
         bool markersFound[a][b] = true;
       }
      }
 }