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matlab algorithm question

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James
James on 21 Jul 2011
The below link shows an algorithm I want to try and use and I have a few questions about.
Firstly, I am assuming that when i=0, the first frame of a video is titled caltrain000.
for i = 0:30
imgINumber = i;
imgPNumber = i+2;
I also want to know what the below code does? Because when I try and run the code with my own video frames I get the error - "Index exceeds matrix dimensions".
imgI = imgI(:,1:352);
imgP = imgP(:,1:352);
Please help with these two questions

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Answers (2)

D
D on 21 Jul 2011
In regard to your second question,
a = a(:,1:3)
redefines a to be all rows of the current matrix, but only columns 1 through 3.
So, say
a = [ 1 2 3 4 5 6; 7 8 9 10 11 12; 13 14 15 16 17 18];
then you get
>> a = a(:,1:3)
a =
1 2 3
7 8 9
13 14 15

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Fangjun Jiang
Fangjun Jiang on 21 Jul 2011
When i=0, imgIFile='./caltrain/gray/caltrain000.ras'
The operation is like crop an image. All rows are selected, but only column 1 to 352 (pixel?) are selected.

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James
James on 21 Jul 2011
Do you know why the image need to be cropped like this for motion estimation?
Fangjun Jiang
Fangjun Jiang on 21 Jul 2011
No idea. I guess it might be related to the size of the image.

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