Recently, Nanjing University of Technology School of Electronic Engineering and Optoelectronics Technology Professor Zuo Chao, demonstrated in the laboratory of his latest scientific achievements - rapid three-dimensional optical sensing technology. This technology has broken through several bottlenecks of the speed of the traditional three-dimensional structured light measurement method, greatly improving the scanning speed and providing an effective way to extend the measurement object from static and slow changes to real-time, high-speed and even transient changes.
According to the left super introduction, the reason why can achieve such a high three-dimensional imaging speed, the secret lies in their use of optical projection system and the method of three-dimensional reconstruction.
Left super interpretation, the three-dimensional data acquisition has three main steps, the structure of the light projected onto the object to be measured, through the camera to capture images, and then through the image reconstruction of three-dimensional data. "Currently, the prior art can only project dozens of structured lights at most once a second, and our technology can reach 20,000."
The introduction of the left super, this breakthrough with their design digital micromirror array projection system, in a 1 cm square in the plane, set a million small angle mirror, the shooting process, these small mirror can achieve fast flip , So as to achieve fast switching of the optical pattern.
As early as 2011, Zuo Chao started his research work on 3D optical sensing under the leadership of Professor Chen Qian and in 2012 developed a real-time 3D imaging system.
The system takes 120 frames of 3D data in real time in a second, five times as fast as the TV's refresh rate, a time that would have taken seconds to reconstruct a 3D image using conventional techniques. Recently, the left super team to improve the technology, through the stripe coding information multiplexing and polar line constraints to make the imaging efficiency has been further improved. The result was published on Optics Express and was selected as a highlight of the OSA Image of the Week.
"Just a moment passed, our optics have projected twenty thousand transformed optical patterns onto objects and synchronized with high-speed cameras to finally reconstruct three thousand three-dimensional images from these images." Left Super introduction, the reason why we can achieve such a high three-dimensional imaging speed, the secret lies in the optical projection system they use and methods of three-dimensional reconstruction.
He explained that three-dimensional data acquisition has three main steps: project the structured light onto the object to be measured, take the image through the camera, and reconstruct the three-dimensional data from the image. "The current state-of-the-art technology can only project dozens of structured lights at most once in a second, and our technology can reach 20,000." He introduced this breakthrough with the digital micromirror array projection system they designed, A 1-centimeter-square plane has millions of small, variable-angle mirrors that can be quickly flipped over during shooting to achieve fast switching of optical patterns.
In the use of pictures, the reconstruction of three-dimensional data, they also broke through the bottleneck. "In the past algorithms, more than a dozen images were needed to reconstruct a 3D dataset, and our new algorithm only needed a minimum of 3. The images generated in an instant and more needed to reconstruct fewer images, The amount of 3D data obtained is greatly increased, making 3D models faster and more accurate. "
Left super introduction, even the human eye can not capture high-speed movement of objects, such as the falling table tennis, rapid rotation of the blade, in front of this system are "nowhere to hide," can be captured to the full Three-dimensional data.
According to the left super introduction, as early as 2011, he started under the leadership of Professor Chen Qian three-dimensional optical sensing related research work, and in 2012 developed a real-time three-dimensional imaging system. The system can take 120 frames of 3D data in real time in one second, which is five times as fast as the refresh rate of the TV we normally watch, whereas it takes seconds to reconstruct a 3D image using conventional techniques. Recently, they have made improvements to this technique, which further improves the imaging efficiency and measures the accuracy through the multiplexing of the stripe code information and the polar line constraint. The result was published on Optics Express and was selected as a highlight of the OSA Image of the Week.
"Our current job is to increase the imaging speed by two orders of magnitude and break through 10,000 frames per second to capture the three-dimensional information that the human eye can not capture." Zuo Chao pointed at the three-dimensional fan on the computer screen. "Now that we have done 1250Hz, this speed is enough to capture the deformation of high-speed rotating fan blades; if it can reach 10,000 frames, the technology is expected to be widely used in many fields such as automobile crash test and ballistic test analysis."