how can i identify the damaged portion in the matrix?

suppose i initialize an image in a ex:-a=imread(obj.gif); after that i cropped the image by using b=imcrop(a); now i want to identify the damaged portion and want to apply some operation on it,so please tell me how i can perform this?

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers

Answer 1

[Wayne King]

What do you mean by "damaged portion" imcrop() optionally returns additional outputs like the cropping rectangle as well as the X-data and Y-data

[RAVI]

actually sir,i am doing project on image inpainting so there is need for identify the portion of an image which are not completely visible or any scratches on it.

[Walter Roberson]

RAVI, you cannot do that without additional information about how to distinguish areas that are scratched or not completely visible.

[RAVI]

sir,how i can got the additional information about how to distinguish areas that are scratched or not completely visible.

[RAVI]

sir actually i am newer in matlab & i m starting it with zero,so plz help me.

[Walter Roberson]

What characterizes a "scratch" ? What characterizes an area "not completely visible" ?

[Image Analyst]

RAVI, why are you not uploading an image like I suggested way up at the top? As you can imagine, if people are asked for advice on image processing, it helps to have an image. Otherwise all I can say is "threshold then call regionprops() and good luck."