CODEWITHSUNDEEP
c#image-processingcolorsbitmap
Alparslanyk
Alparslanyk

Reputation: 45

C# aforge color detection

I am trying to learn Aforge.net. I write o code and it works fine but ı wanna detect just purple color on my image but ı could not find out how it is. so any one can help me about it? here is my code

Bitmap resim = new Bitmap(pictureBox1.Image);

EuclideanColorFiltering filter = new EuclideanColorFiltering();
// set center color and radius
filter.CenterColor = new RGB(80,90,120);
filter.Radius = 40;
// apply the filter
filter.ApplyInPlace(resim);

pictureBox1.Image = resim;

and there is my source image

After my filter it is this

So what can ı do to pick just purple numbers without other thing oor just purple things in this picture?

Upvotes: 2

Views: 5837

Answers (1)

Univers3
Univers3

Reputation: 933

I suggest you to use a HSLFilter, for a better color filtering

HSLFiltering filter = new HSLFiltering();
filter.Saturation = new Range(0.05f, 1f);
filter.Luminance = new Range(0.05f, 0.70f);
filter.Hue = new IntRange(280, 340); //these settings should works, if not
Bitmap red = filter.Apply(image);   //search "HSL color picker online" to tune it

After the color filtering step you may proceed at the blob filtering step.

Filter each blob that:

 1. Have a Width more than 20%(example) of the Image.Width (for the height too)
 2. Have a too much/too poor fullness (blob.fullness)
 3. Have a not good ratio Width/Height

Finally you should have only the numbers or at least only 1-2 blobs more

Upvotes: 2

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