Probably much like the code Chandra provided you for detecting squares, except changing the arguments to the rectangle() call a bit. The rectangle() call is able to draw ovals if you give it the proper arguments. regionprops() can tell you the major and minor axes of the object.
how to detect oval shape
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i want to detect oval shape only in image. how can i do this using matlab in easy way. http://i1108.photobucket.com/albums/h404/abdulhadi3/ConferenceSurveyForm.png
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