orientation of connected component in a binary image

hi friends can some one help me in finding orientation of each connected component in a binary image. To be more clear in the above image how to calculate that how much each white region is inclined? Basically i am working in number plate detection. I am able to locate number plate but some times number plate is locating but in parts. So depending on difference between angle of inclination of two connected regions i want to combine that particular two regions.

Thanks

Answer 1

[Image Analyst]

Call regionprops(), asking it to return 'Orientation'. See my image segmentation tutorial if you need help.

[srikanth]

thanks Image analyst regionprops() is working good but when i am subtracting between two angles matlab is giving an error saying "Undefined function or method 'minus' for input arguments of type 'struct'."

[Image Analyst]

You can't subtract the structures. The structure could have lots of members representing area, angles, perimeters, etc. You need to extract the angles and then subtract them.

allAngles = [measurements.Orientation];
differenceAngle = allAngles(3) - allAngles(1); % Or whatever you want to subtract.