We introduce a method for object class detection and
localization which combines regions generated by image
segmentation with local patches. Region-based descriptors
can model and match regular textures reliably, but fail on
parts of the object which are textureless. They also cannot
repeatably identify interest points on their boundaries.
By incorporating information from patch-based descriptors
near the regions into a new feature, the Region-based Context
Feature (RCF), we can address these issues. We apply
Region-based Context Features in a semi-supervised
learning framework for object detection and localization.
This framework produces object-background segmentation
masks of deformable objects. Numerical results are presented
for pixel-level performance.