Abstract: A method for reconstructing a three dimensional (3D) model, suitable for reconstructing the 3D model of an object by using a voxel, is provided. After the voxel is cut to a plurality of sub-voxels, the sub-voxels of which a projection image is inside a silhouette image are reserved. It is determined whether to recut the sub-voxel corresponding to the projection image, which is on the edge of the silhouette. When it is determined to recut the sub-voxel, the above-mentioned steps are repeated until recut is not required, thereby reconstructing the 3D model according to the reserved sub-voxels.

Abstract: A method for calibrating a response curve of a camera is provided. A homography relationship of an image sequence captured by the camera is calculated using a coplanar information including feature correspondence blocks of the image sequence. An intensity mapping function is then obtained from the intensity information of the correspondence blocks according to the homography relationship. The calculation for obtaining the intensity mapping function is significantly reduced by focusing on the correspondence blocks, which can also avoid the problem of outliers.

Abstract: A 3-D face recognition system has a first data storing module for storing 3-D face model data and 2-D face image data; an input unit for inputting 3-D face model data and 2-D face image data; a signal converting module for converting analog data of the 3-D face model data and 2-D face image data to digital data; a second data storing module for storing the digital data; a microprocessing module for analyzing geometric characteristics of points in the 3-D face model data stored in the first and second data storing module to determine feature points of the 3-D face model data, and assigning different weight ratios to feature points; and a comparing module for comparing the feature points stored in the first and second data storing module, during which, different geometric characteristics being given different weight ratios, and calculating relativity between the feature points to obtain a comparison result.