analysing image to find blobs
analysing image to find blobs
- Subject: analysing image to find blobs
- From: Roland King <email@hidden>
- Date: Sat, 29 Nov 2008 12:18:03 +0800
I have an image, it's PNG in this case although GIF/JPG are possible.
It's got a transparent background and a few well-spaced coloured
circles on it. Most of the image is blank.
I want to search the image and find the locations of the circles.
My first thought was to convert to some kind of bitmap, perhaps one
which is greyscale or even one-bit per pixel, using some of the
standard libraries, then go hunt the bitmap. What I was looking for
here was a couple of pointers to what classes and methods in the
documentation would give me a good place to start. eg a good way to
convert a PNG to a bitmap, how to flatten the colour space right down.
If someone has something like 'read about these two classes, take a
look at these 4 methods and you probably want this kind of transform',
that would get me going in the right direction.
You can probably assume that if I get to the point I have something I
can search across and determine for each point if it's coloured or
not, I can manage the 'finding the center of the circle' bit of the
algorithm. I just want to get the data into the best format for it as
fast as possible using as much framework as I can.
Thanks
Roland
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