Trim Video

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Capturing video from several views there needs to be some kind of trimming to ensure that each view correspond to each other in the digitizing process. Also it is often necessary when capturing video to capture a time sequence that is longer than the on in interest. Both cases need some kind of trimming of the end video sequence. The RealCap module has a built in feature that enables this trimming process.

After the capturing process has ended and no frames (images) has been dropped during the process you are asked if you would like to proceed directly to the trimming of the video.

The basic idea with trimming is to select a synchronization image/frame which is unique to the movement of interest. This could be the release of a discus or a heel strike during gait analysis.

Using the synchronization image/frame the next step is to select the number pre and post images. Meaning how many images has to be stored in the AVI file for the digitizing process.

When capturing a new view the previous setting of sync image and pre and post number of images is kept in order to keep the same setting for the pre and post.

When the Trim dialog is on the screen navigation through the captured sequence can be don using the following buttons:

1. Next : Jumps a full page forward

2. Prev : Jumps a full page backward

3. Start : Jumps to the beginning of the video sequence

4. End : Jump to the end og the video sequence.

5. - : Steps one image forward

6. + : Steps one image backward

7. -> : Playback of the current video in slow motion.

8. <- : Slow motion Playback in revers of the current video.

9. Stop : Stop playback mode.

The definition of a page is setup using the following buttons:

1. 4x3 : 4 times 3 images in page (sum of 12 images in page)

2. 3x2 : 3 times 2 images in page (sum of 6 images in page)

3. 2x2 : 2 times 2 images in page (sum of 4 images)

4. 2x1 : 2 times 1 images in page (sum of 2 images)

Selecting the Sync image: Selecting the sync image the Sync radiobutton must be click on. Navigate through the images and find the image you want and click the image.

Selecting the Pre number of images: Selecting the Pre number of images the Pre radiobutton must be selected. When selecting the image that has to be the first image in the sequence the number images is automatically set. The number of images can also be set manualy using the edit box.
It is very important to remember that the Pre Number images is not an specific image as in the case of the sync image but the number of images that has to go before the sync image.

Selecting the Post number of images: Selecting the Post number of images the Post radiobutton must be selected. Determining the Post number of images the same applies as for the Pre number of images describe above only that the Post number of images respons to the number of images that has to go after the sync image.

Capturing multiple view: In case where there is multiple views (i.e. in 3D motion analysis) the selection of pre and Post number of images is only necessary for the first view. After this has been setup only the selection of the sync image is necessary keeping the sam time frame for all views.

Trim Old video..

In the File menu there is an option called Trim Old Video where it is possible to trim a previous saved video. The trimming processe is still the same but before the process can take place you will be asked to find the video to trim using a simple file open dialog box.

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