Function attribute_aspect_ratio

Computes the aspect ratio change attribute for the object in the given seqeunce

Aspect ratio change is defined as the average of per-frame aspect ratio changes. The aspect ratio change at frame t is calculated as the ratio of the bounding box width and height in frame t divided by the ratio of the bounding box width and height in the first frame.

Input:

• sequence (struct): An array of sequence structures.

Output:

• mean_val : mean value of aspect ratio changes for the sequence

• val_val : variance of aspect ratio changes for the sequence

• frames : aspect ratio change for each frame