Question

Well I’m working hard on my vehicle license plate detection algorithm, and need a little help with something simple.

Basically I’m trying to do the following, the code is self explanatory, I just can’t find an example of what I’m trying to implement.

Thanks in advance

if (img.GetPixel(bottomRightc.X, y) <= Color.FromArgb(255, 255, 255, 255) 
    && 
    img.GetPixel(bottomRightc.X, y) >= Color.FromArgb(255, 166,166,166))
           {
               return false;
           }

EDIT:

Thanks for the replies everyone, I didn’t put much thought into the comparison, and saw the problem with it after creating this thread. I think I’ll go with brightness comparison since my image has been grayscaled and has a high contrast.

Answer 1

Have you considered working in another color space? With HSV/HSB you could simply do something like

if (pixelColor.V <= 255 && pixelColor.V >= 166)
{
    return false;
}

Assuming min-max of Value/Brightness 0-255. And assuming you are trying to accomplish brightness comparison, which is not entirely clear to me.

Edit:

There are methods for this in System.Drawing.Color, and brightness is between 0.0 and 1.0. So the above would become ~something like this:

    if (pixelColor.GetBrightness() <= 1.0f && pixelColor.GetBrightness() >= 166.0f/255.0f)