move a window from top to bottom

hai

 any one please tell me  how to make window of size 100 pixels centered at a particular location to move from top to bottom over a image

thanks in advance

[Jan]

Could you post some more details? What should happen with the windowed area? Isn't it a contradiction that the window is moving and centered at a particualr location? What exactly does "image" mean? Should it be displayed in a figure are are you processing the values in a 2D-Matrix or RGB-Array?

[Image Analyst]

I also am confused by your lack of information. Perhaps you mean to use the plot() or rectangle() command and a timer to move a box around in the overlay over an image. Perhaps you mean to use blockproc(), or even conv2(), imfilter(), nlfilter(), or something else.

[ramya raj]

i am projecting some features and obtaining a graph

in the graph i am getting peak value at the location of 600

now i have to make a window centered at 600 and move the window from top to bottom how to do this

[Jan]

@Ramya: It is not getting clearer. Although you know exactly what "projecting some feature and obtain a graph" means, we cannot have the faintest idea of what you are talking about. Neither "projecting", nor "feature", nor "graph" are unequivocal terms in the field of mathematics and computer science. The same problem concerns "window" - do you want a rectangle drawn inside the AXES, a FIGURE window or do you want to perfom some calculation on rectangular parts of the data? What is the "location 600"? Pixels relative to the screen or to the figure, or the Y- or X-value of the data?

Answer 1

[Walter Roberson]

If the window must move in a particular direction, top to bottom or bottom to top, then you will need to use a "for" loop or one of the compact equivalents (such as arrayfun())

If it does not matter which direction the window moves as long as everything gets covered, then see blockproc(), or blkproc() if you have an older version of MATLAB.

Answer 2

[Walter Roberson]

Use rectangle() or patch() to create the window. Use a loop and set() and drawnow() to change the position of the window in a regular way and have the new position updated on the screen.

For example, if you created a patch, you could set() the YData property of the patch to change its vertical position.