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PChoppala
PChoppala on 9 Oct 2011
Hi I want to create an 30 frames of images with each image having 20*20 pixels. I would also want to access the grey scale level of each pixel. Please help me out with this Thanx

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PChoppala
PChoppala on 9 Oct 2011
And also, I want to set a threshold \gamma = 2, and find which value of the pixels cross the threshold, for each frame
  3 Comments
PChoppala
PChoppala on 9 Oct 2011
I want to access the intensity of each pixel, and find those pixels whose intensity cross the threshold '2'
Image Analyst
Image Analyst on 10 Oct 2011
Hmmm... that was not a clarification. So I'll just say the intensity of each pixel is imageArray(row, column). And the rows and columns can be found using [rows columns] = find(imageArray > 2). Regarding "those pixels whose intensity cross...": What pixels are those? A pixel has one single intensity - it's intensity does not "cross" anything. You'd have to be talking about a group of pixels to talk about the intensity crossing anything, like the boundary where the pixels are now >2 and where on the other side of the boundary they are <=2. Perhaps some careful decisions about what terms you use could help describe your situation better.

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More Answers (1)

Walter Roberson
Walter Roberson on 9 Oct 2011
How have you stored the 30 frames ?
Probably the easiest way would be to store them as a 3D array indexed at Row, Column, and FrameNumber.
  7 Comments
PChoppala
PChoppala on 10 Oct 2011
rand(20,20) is not correct....
Image Analyst
Image Analyst on 10 Oct 2011
So multiply by 255 and cast to uint8. By the way, an image does not have to be in the range 0-255. That's just for 8 bit unsigned gray level images, but you can have 16 bit integer images, floating (double) point images, etc.

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