Invention Grant
- Patent Title: Recovering parameters from a sub-optimal image
- Patent Title (中): 从次优图像中恢复参数
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Application No.: US11747695Application Date: 2007-05-11
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Publication No.: US08009880B2Publication Date: 2011-08-30
- Inventor: Zhengyou Zhang , Zicheng Liu , Gang Hua , Yang Wang
- Applicant: Zhengyou Zhang , Zicheng Liu , Gang Hua , Yang Wang
- Applicant Address: US WA Redmond
- Assignee: Microsoft Corporation
- Current Assignee: Microsoft Corporation
- Current Assignee Address: US WA Redmond
- Agency: Lyon & Harr, L.L.P.
- Agent Craig S. Fischer
- Main IPC: G06K9/00
- IPC: G06K9/00 ; G06K9/56 ; G09G5/00

Abstract:
A subregion-based image parameter recovery system and method for recovering image parameters from a single image containing a face taken under sub-optimal illumination conditions. The recovered image parameters (including albedo, illumination, and face geometry) can be used to generate face images under a new lighting environment. The method includes dividing the face in the image into numerous smaller regions, generating an albedo morphable model for each region, and using a Markov Random Fields (MRF)-based framework to model the spatial dependence between neighboring regions. Different types of regions are defined, including saturated, shadow, regular, and occluded regions. Each pixel in the image is classified and assigned to a region based on intensity, and then weighted based on its classification. The method decouples the texture from the geometry and illumination models, and then generates an objective function that is iteratively solved using an energy minimization technique to recover the image parameters.
Public/Granted literature
- US20080279423A1 RECOVERING PARAMETERS FROM A SUB-OPTIMAL IMAGE Public/Granted day:2008-11-13
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