Documentation for Video/ContourShape

Technique Contour shape descriptor
Document MPEG-7 Visual (ISO/IEC 15938-3)
Name Miroslaw Bober (Mitsubishi Electric ITE)
EMail miroslaw.bober@vil.ite.mee.com
Contact miroslaw.bober@vil.ite.mee.com
Type Application
External Libraries none
Related Ds/DSs Still region DS
Used Ds/DSs none
Input Binary shape masks
Extraction Yes
Client Appl Search & Retrieval
Summary The Contour-based shape descriptor describes shape features of
a closed contour. It uses the curvature scale space representation and
eccentricity and circularity of the original and filtered shape.
Strong Points The descriptor is rotational, scale and position invariant.
It is robust to affine shape deformations and deformations
due to non-rigid motion (both very common in video sequences)
The descriptor has good shape generalisation properties,
similar to human perception of visual shapes. It is very compact
(110 bits on average for the MPEG-7 shape database).
Limitations Here are some limitations of the current implementation:
Deafult white shape on black background (can be changed)
If more than one contour is in the image, the descripotr is extracted
from the first contour found in the image (upper-left, top left).
Known Problems None
Parameters Uses the general XM-SW parameters.