Concept of scales in Gabor filter

1. What is Gabor feature extraction?
2. What is a Gabor patch?

What is Gabor feature extraction?

Features are extracted directly from gray-scale character images by Gabor filters which are specially designed from statistical information of character structures. An adaptive sigmoid function is applied to the outputs of Gabor filters to achieve better performance on low-quality images.

What is a Gabor patch?

Gabor patch (plural Gabor patches) A kind of pattern used as a stimulus in experiments on vision, capable of being arranged to produce various optical illusions.