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PChoppala
PChoppala 2011-10-9
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 2011-10-9
And also, I want to set a threshold \gamma = 2, and find which value of the pixels cross the threshold, for each frame
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PChoppala
PChoppala 2011-10-9
I want to access the intensity of each pixel, and find those pixels whose intensity cross the threshold '2'
Image Analyst
Image Analyst 2011-10-10
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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Walter Roberson
Walter Roberson 2011-10-9
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.
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PChoppala
PChoppala 2011-10-10
rand(20,20) is not correct....
Image Analyst
Image Analyst 2011-10-10
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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