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Re: Identifying a rectangluar area made up of small dots (80%-20% screen
Re: Identifying a rectangluar area made up of small dots (80%-20% screen)
Thu, 04 Nov 2010 15:06:17 -0400
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On 11/03/2010 08:27 PM, Ian Journeaux wrote:
In one of the analysis methods we are developing, I need to determine the
location of a rectangular area that is made up of tiny dots in an image. In
print terms it is a 20% to 80% screen. The area beterrn the dots is white
the dots are black
Once I have the area identified, I can perform the analysis on the image.
Unfortunately right now finding the area to analyze takes as long as doing
Any thoughts on a technique that might be more efficient?
What technique did you use? For a known image like you seem to have, a
convolution filter might work: if a is your grayscale image, and b is
the pixel pattern of your area, conv2(a,b) should peak where your images