how to effectively remove background of an image c#

Question

Hello i am a newbie in c# programming, using visual studio 2010. I am currently working on a project and i am stuck at the part where i must effectively remove the background of an image. I am working on images like flowers.

Answer 1

If the image has a solid color background, you can use System.Drawing.Bitmap.GetPixel() and System.Drawing.Bitmap.SetPixel(). You may also want to look at the methods of the System.Drawing.Graphics object.

If the background is more complex, you'll need to use a process / algorithm that is beyond the scope of the forum. Good luck.

http://msdn.microsoft.com/en-us/library/system.drawing.bitmap.getpixel(v=vs.110).aspx

http://msdn.microsoft.com/en-us/library/system.drawing.bitmap.setpixel(v=vs.110).aspx

http://msdn.microsoft.com/en-us/library/System.Drawing.Graphics(v=vs.110).aspx

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Deltazon

Answer 2

Hi medley2014,

I think you need some knowledges about graphics processing to accomplish this task, maybe some graphical analysis algrithms. C# can't help you on this, as Deltazon said.

The same question is asked here, you can refer to the ansers in this thread:

http://social.msdn.microsoft.com/Forums/en-US/0a89b2df-47e8-4950-ae28-4b48a340bf7e/how-to-effectively-remove-background-of-an-image-c?forum=csharplanguage

I think this article will also give you some ideas, it is about the contour analysis of images:

http://www.codeproject.com/Articles/196168/Contour-Analysis-for-Image-Recognition-in-C

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Answer 3

Establish a rule, for example that the pixel at [0,0] must be the 'transparent' color (the background).  Load the image as a Bitmap (let's call it bmp), and then do something like this:

bmp.MakeTransparent(bmp.GetPixel(0, 0));

Answer 4

Hi Thanks, But this code will remove same color in a background while getting what color in (get pixel(0,0)).But i want to remove different color in background. If u have any idea means reply. Thank u for your answer.