# MATLAB: How to make a face image scramble by matlab

Image Processing Toolboxurgent

I want to scramble a grayscale image and actually I want to have patches or square blocks and scramble by them. But before that I have to mask my image by an oval then scramble the part of image that is inside of oval, for this reason I have to make vertical and horizental strips in that oval and scramble them. Also I prefer to have ability to change size of this strips. Would you please help me by that?
I have this image:
(mary.BW)and I mask it by oval by this code:
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clear all Baselum=0; Radius=342;X=206 Y1=78; Y2=323;for c=1      I=imread(['C:\Users\User\Desktop\oval mask\attached image.jpg']);      for i=1:400          for j=1:400              ovaldistance=(sqrt((X-i)^2 + (Y1-j)^2)+sqrt((X-i)^2 + (Y2-j)^2));              if ovaldistance > Radius                  I(j,i,:)=Baselum;              end;          end;      end;      imwrite(I,['OvalMask1','attached image.jpg']);  end;
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and the result will be like this:
(oval mask.jpg)
and now I want to scramble part of image that is in the oval. I have to make strips and flip them in order to make the image scrambled. But I don't know the right matlab function to do it. Please Help me. The result must be something like the third attached image:
Pleaaaaaasee help meeeeeeee

#### Best Answer

• That's not scrambling. it's just an inefficient way of doing masking (inefficient because you create the mask for every pixel and call randperm when you don't have to). There are lots of ways to scramble. How do you want to do it? Do you just want to use randperm to send each pixel to a new location?