Online Learning Based Face Distortion Recovery for Conversational Video Coding

In a video conversation, the participants usually remain the same. As the conversation continues, similar facial expressions of the same person would occur intermittently. However, the correlation of similar face features has not been fully used since the conventional methods only focus on independent frames. We set up a face feature database and updated it online to include new facial expressions during the whole conversation. At the receiver side, the database is used to recover the face distortion and thus improve the visual quality. Additionally, the proposed method brings small burden to update the database and is generic to various CODEC.