Abstract:In three-dimensional shape measurement, some regions of the objects are unable to be decoded or decoded incorrectly, using binary spatio-temporal encoded illumination due to occlusion, shadow and low-pass filter characteristic of the optical systems etc. To mitigate the problem, a redundancy encoding method was proposed. Two adjacent sections were encoded with the same code and distinguished with their temporal coordinates. According to the redundancy encoding method, measurement results can be checked and some sections can be recovered from incomplete codewords during decoding. Compared with the original method, more valid points were obtained and the reliability of the decoding results were improved with proposed method, which presents more information for error correction.