image feature extraction

hi! i'm new to matlab and want to extract certain features like angle, etc from an image. please enlighten me about the functions, etc i need to know for the coding...

[Image Analyst]

Have you already tried the examples/demos that ship with the Image Processing Toolbox (see its category in the help program)?

Answer 1

[Image Analyst]

I have some excellent image analysis demos on my File Exchange to get you started: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

[arihant koc]

these demos wud be quite helpful, it wud be great if u cud provide some similar stuff on extrcting fratures like angle, replacing by geometric models, area computation, etc...once again, thanks a lot!!

[Image Analyst]

BlobsDemo and I think some of the color segmentation demos calculate area, centroid, etc. You can just change the call to regionprops to ask it to measure other things like angle (orientation). If I put too much into it, I get complaints that it's too long and complicated for novices to understand. Not sure what you mean by geometric models but if you mean shape, you can do a lot of shape filtering by using solidity and the perimeter squared to area ratio.

[Arvind mani]

thanks

[guezoui zahia]

I need a programs of geometric and texture features extraction of the weld defects from the radiographic images.

[Image Analyst]

OK, thanks for the announcement. MATLAB can certainly do that. Have fun.