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6.0. Eleventh_Year.Shots_mean_frame_diff.Full_visualization | by culturevis
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6.0. Eleventh_Year.Shots_mean_frame_diff.Full_visualization

A graph of all shot in a film showing patterns of movement.

film: The Eleventh Year (Dziga Vertov, 1928).

 

Every shot is represented by its first frame. Shots order: left to right.

Every shot was analyzed by software to measure average amount of movement across all frames in this shot. These measurements are plotted below the frames. Longer bars - more motion; shorter bars - less motion.

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film: The Eleventh Year

data: every shot of the film is represented by 1 frame. Shots are organized

in order of their appearance in the film (left to right). Note: only first 580 shots out of 653 total are shown)

 

graph: averaged frame differences per shot.

method: For each shot, subtract subsequent frames (frame 1 from frame 2, frame 2 from frame 3, etc.) and calculate mean of the greyscale values of a difference image. Next, calculate the average of these value by adding them and dividing by a number of frames in the shot.

 

The resulting value indicate the degree of visual changes in the shot. It is blind to the source of change (moving objects, camera movement, changing pixel values creayed via to animation in motion graphics, or any combination of these sources.)

 

Because of the significant visual noise in the data (film artifacts, vertical jumps between frames), the measurements are not precise - for instance, while in principle frame differences between frames in shots which are static frames should be all 0, they are not. However, even with these imprecise measurements, we see obvious patterns in the film.

 

(The values for intertitle shots were set to 0.)

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Taken on November 19, 2009