A Comprehensive Introduction to Key Points of Face Recognition

Image preprocessing
Light compensation
Illumination changes are mainly manifested as intensity changes and angle changes. Changes in light intensity
Causes extreme lighting conditions ( such as dark light, high light, etc. )
However, the change of illumination angle will produce different degrees of surface bright and dark areas, dark areas of illumination
Grayscale change
The gray distribution of face images is the main part of Face recognition based on gray images.
Information basis. Two Images of the Same Face Obtained under Different Illumination Conditions
Can be said to be completely different two images, the gray scale between the two images
The difference in cloth may be greater than the difference in gray distribution between different faces, thus
This may lead to a decrease in the recognition rate.