ISRI > Project > 3D reconstruction

3D reconstruction

Leader: Daesik Kim
Contact: Daesik Kim (

Mailing address:
SungKyunKwan University
Intelligent System Research Center (ISRC)
Nano and Intelligent System Lab
83695 Research Complex-2,
300 Cheoncheon-dong, Jangan-gu,
Suwon, Gyeonggi-do
440 - 746
Project Description
To encode a position, we assign a unique address in each position of the projector's image. We can consider pixels on an epipolar line only; because a structural light system is similar to a passive stereo camera system with one of the cameras replaced by a projector. If we use a perfect orthogonal binary code set, the system has a computational problem even though we can acquire a very accurate depth image because the number of total frame of camera should be equal to the number of codes. In order to avoid this problem, we propose a signal coding algorithm. The algorithm arranges a set of orthogonal codes hierarchically in order to reduce the length of codes. We named our method “HOC (Hierarchical Orthogonal Coding).” The HOC technique focuses on the reducing the code length as short as possible, while preserving the characteristics of the orthogonal code. In the encoding process, the length N of the code is divided into a few layers L. And each layer includes H orthogonal codes recursively as shown in the bellow. Although the signal's codes in the HOC are not orthogonal, each layer has a set of orthogonal codes.

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