Function to Image One Area of Video Over Time

[dhdinh07]

Hello,

I am new to ImageJ and was referred to this by my professor, who doesn't remember the name of the function that I need to use.

I have a 1474-frame long video and I want to select a region in the x-direction, say 100 px wide and 1 px long. I am looking for a function that can create an image that is 100 px wide by 1474 px long (1 pixel for every frame). In other words, the function shows how one area changes over time as an image.

Can ImageJ do this, and if so what is the function called?

Thank you so much.

[Michael Schmid]

On May 13, 2015, at 21:48, dhdinh07 wrote:

> I am new to ImageJ and was referred to this by my professor, who doesn't
> remember the name of the function that I need to use.
>
> I have a 1474-frame long video and I want to drag a horizontal line in the
> x-direction, say 100 px long. I am looking for a function that can create an
> image that is 100 px wide by 1474 px long (1 pixel for every frame). In
> other words, the function shows how one area changes over time as an image.
>
> Can ImageJ do this, and if so what is the function called?

Hi anonymous,

you can do the following:
- Open the video as (virtual) stack (obviously, this requires a format that ImageJ can read)
- Make a rectangular selection one pixel high
- Image>Crop
- Image>Stacks>Reslize with default settings

Michael

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[Rasband, Wayne (NIH/NIMH) [E]]

> On May 13, 2015, at 3:48 PM, dhdinh07 <[hidden email]> wrote:
>
> Hello,
>
> I am new to ImageJ and was referred to this by my professor, who doesn't
> remember the name of the function that I need to use.
>
> I have a 1474-frame long video and I want to drag a horizontal line in the
> x-direction, say 100 px long. I am looking for a function that can create an
> image that is 100 px wide by 1474 px long (1 pixel for every frame). In
> other words, the function shows how one area changes over time as an image.
>
> Can ImageJ do this, and if so what is the function called?

You're looking for the Image>Stacks>Reslice command. Open the video as a stack. Use the straight line tool to create a 100 pixel wide horizontal line selection. (Hold the sift key down to constrain the selection so that it horizontal.) Press “/“ (Image>Stacks>Reslice) and press “OK” in the dialog, using the default settings. The Reslice command will then create a 100x1474 image that shows how the video changes over time.

-wayne

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