matlab algorithm question

3 次查看（过去 30 天）
James
James 2011-7-21
The below link shows an algorithm I want to try and use and I have a few questions about.
Link
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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回答（2 个）

D
D 2011-7-21
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
Fangjun Jiang
Fangjun Jiang 2011-7-21
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.
  2 个评论
James
James 2011-7-21
Do you know why the image need to be cropped like this for motion estimation?
Fangjun Jiang
Fangjun Jiang 2011-7-21
No idea. I guess it might be related to the size of the image.

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