These codes are for the following paper published in Pattern Analysis and Applications,
He-Feng Yin, Xiao-Jun Wu, Josef Kittler, and Zhen-Hua Feng. Learning a representation with the block-diagonal structure for pattern classification. Pattern Analysis and Applications, 2020, 23: 1381–1390.
The link is,
https://link.springer.com/article/10.1007/s10044-019-00858-4
Just run main_Sunglasses.m and you will obtain the result under the Sunglasses scenario on the AR database.