Study On Structured Light Based Depth Sensing For Complex Scenes

With the rapid development of science and technology,3D reconstruction has been widely used in many fields,such as medicine,cultural reconstruction,automatic navigation,human-computer interaction.As a key issue of 3D measurement,depth acquisition has become a hot topic on computer vision.Compared with various methods of depth acquisition,structured light measurement is the focus of current research due to its simple principles,easy to implement,high accuracy,strong anti-interference ability.A single-shot structured light method is widely used to acquire dense and accurate depth maps for dynamic scenes.Firstly,a structured light method based on the two color sequence is proposed in this research.In our research,the color-coded sequence information is embedded into the phase information in order to solve the issue of phase unwrapping.The color-encoded De Bruijn sequence is utilized and the phase information is divided into each channel.Channel G and R are used to the 0-1 of the binary cubic De Bruijn sequence and channel B is for the phase encoding.A more precise phase estimation can be obtained based on this coding method via extracting the intensity information after channel overlay.At the same time,the wrapped phase period is assisted to encode so that the more adequate period order can be obtained.Experimental platform is built to access the performance of proposed method.Quantitative and qualitative analysis conformed that the proposed method has a higher precision depth compared to a Kinect and larger resolution ToF(Time of Flight)camera.Meanwhile,we proposed a structured light method based on the binary sequence to acquire dense and accurate depth data.We combine binary random stripe and phase coding into one pattern to ensure acquire the compact depth,Comparing to the traditional method,the pattern in this article varies according to cosine function which solve the depth errors that result from ambient light,texture of object and intensity distortion.We take full advantage of the saltus step of the wrapped phase to assist the De Bruijn sequence in unwrapping phase.Software simulation would be used to prove the performance of this method.The experiment results show that this method successfully acquired dense and accurate depth in complex scene.