image analysis

[fuman5]

I've never tried to analyze images before.

I want to be able to capture images from a camera and analyze them.

Nothing too complicated. I just want to be able to detect a dot moving across the screen and be able to assign a location to that point. The dot can vary in size and there's only two colors, dot = white and background = red.

I'm already able to capture images from a webcam, but I don't know how to go about proceeding to the next step.

Any help, or hints?

BTW I use vb.net

 

[JohnH]

Load the image into a Bitmap object and use its GetPixel function method to read each pixel color. (http://www.vbdotnetforums.com/showthread.php?t=16174)

 

[fuman5]

Color information

Does GetPixel only return color information, or can I get it to return a numerical value of a color, so that I can place the numerical color information for the entire picture into a string?


If a string is possible, what does the code look like for vb.net.

Thanks again

 

[JohnH]

It returns value of type Color. You can translate that to other value representations like Win32 integer or Html hex string with the ColorTranslator class. For example:

Dim c As Color = Color.Brown
Dim c32 As Integer = ColorTranslator.ToWin32(c)
Dim cHtml As String = ColorTranslator.ToHtml(c)