I have a 5 blobs on a sheet of paper which I scanned into the computer. I want to be able to rotate the blobs about the center of the page. I can't seem to find any tutorial or example on this. Any suggestion would be greatly appreciated
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Hi ikework,
I converted the image to binary and extracted the blobs using aforge.imaging (codeproject.com). The blob object has x and y coordinates, mass, width and the length. Aforge.imaging has a rotation function that can rotate the whole canvas but I'm looking for something that only rotates the blobs inside.
Ozo, I wil take a look at your links.
Thanks
Blob is a rectangular image, so it will be rotated as a rectangle. The only way to do what you are looking for is to extract the blob, export it as an independent image by using ExtractBlobsImage() then making the background color (BLACK, in general) transparent (need to use ARGB format to set Alpha chanel to 0) then rotate it and apply it elsewhere as you want. Recall blobs are blobs only in the aforge environment.; outside they are simple images.
If you are writing the whole code, can learn a lot with gimp source codeabout image processing. If you need to rotate the images by hand, can use gimp or IrfanView.
Jose
mattphung,
Gimp www.gimp.org is an open source program similar to Photoshop. By examining its source code, on can lear a lot on image processing in a practical way. Irfan www.irfan.com is a simple and powerful tool for interactive image processing. The source isn't available, but the functionalities are great.
Sources for Image Processing learning are easy to find in the internet, but hard to understand if there is few math knowledge. If you are comfortable with math, take a look at http://www.ph.tn.tudelft.n
If you are looking for game programming, then you need look towards geometry, which is another field of computer graphics. The short way is to use a 3D game engine, like doom (http://doom.wikia.com/wik
Jose
Please note that my previous answer couldn't be useful if you aren't interested in graphics programming, but in graphics and imaging as an user.
In this case, please ignore the suggestions to look at Nehe and source codes.
But the gimp application, for sure, is very useful to manipulate images, including to select a part of a given image and modify just it, by rotating, scaling, moving, changing its colors and so on.
Jose
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by: ozoPosted on 2009-09-11 at 22:49:11ID: 25315305
http://mathworld.wolfram.c
http://en.wikipedia.org/wi