How to scramble specific elements within an image?

Hi there,

Although I am able to successfully scramble entire images (using JigSaw.m, or RANDBLOCK.m), I cannot figure out how to scramble specific matrix elements within each image. I have attached 'before' and 'after' images showing precisely what I wish to achieve.

The first image is divided into an 8 x 7 matrix, and specific elements (i.e.,1,1;1,2;1,3;1,4;1,5;2,1;2,2;2,3;2,4;2,5;3,1;3,2;3,3;3,4;3,5;4,2;4,3;4,4;5,2;5,3;5,4;6,2;6,3;6,4) are then scrambled to produce the second image.

I would be ever so grateful for any advice, as am a novice to Matlab, and need to complete the stimuli asap!

Kindest regards

Maria

Answer 1

[Image Analyst]

See my attached image scrambling demo.

Answer 2

[Maria Kelly]

Hi there,

Thanks so much for your response, however, this is not what I meant. Perhaps you are unable to view the image I attached? If so the link to images is here: http://faceresearch.org/demos/scramble

I just want to scramble specific 'blocks' within the image, I scramble the image using JigSaw.m, but need to know how to specify the particular blocks to scramble within this.

Many thanks,

Maria