Method for synthesizing virtual viewpoints based on gradient optical flow algorithm and three-dimensional display device
A stereoscopic display device and virtual viewpoint technology, applied in stereoscopic systems, image communications, electrical components, etc., can solve problems such as poor quality of synthesized images, achieve smooth images, meet the requirements of input images, and achieve good quality effects
Active Publication Date: 2014-04-16
PEKING UNIV
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The method based on image rendering has a fast synthesis speed and can meet the real-time requirements, but before synthesizing images, it is necessary to know the geometric information of the 3D scene and the precise physical model parameters of the camera, which often produces large errors in the calibration process, so Composite images are of poor quality
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[0023] Refer to the following Figure 1-3 Examples of the present invention will be described.
[0024] In order to make the above objects, features and advantages more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0025] The basic naked-view stereoscopic display device includes modules such as collection, processing, transmission and display. The first is the acquisition module, which uses multi-camera arrays in different spatial arrangements to acquire 3D video information. At this time, it is necessary to perform calibration and synchronization operations on each camera. In order to improve the quality of the collected signal and make it beneficial to the subsequent 3D reconstruction and display, it is usually necessary to perform various preprocessing operations on the collected video information, such as automatic exposure, automatic focus and automatic white balan...
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The invention discloses a method for synthesizing virtual viewpoints based on gradient optical flow algorithm. The method comprises the following steps of: a starting step: acquiring left-view images and right-view images by using a binocular parallax three-dimensional camera, taking the left-view images as initial images, taking the right-view images as target images, regarding the virtual viewpoints as images which are photographed in a uniformly-spaced manner during the process that the camera moves from left to right; estimating an instantaneous speed, i.e. the optical flow field, of the pixels of the images, generated during a process of moving from the left-view images to the right-view images by using gradient optical flow estimation; synthesizing the virtual viewpoints; and an ending step. The invention further discloses a three-dimensional display device based on the method for synthesizing the virtual viewpoints. The method and the three-dimensional display device can be applied to the technical field of three-dimensional display, the synthesized virtual viewpoints have the advantages of smooth and natural images and better quality on the premise that human eyes can smoothly watch a three-dimensional video in a naked-eye manner, so that the requirements on the basic inputted images of the three-dimensional display device can be met.
Description
technical field [0001] The invention relates to the technical field of image display, in particular to a method for synthesizing a virtual viewpoint based on a gradient optical flow algorithm and a stereoscopic display device. Background technique [0002] According to the current research literature at home and abroad, naked-view 3D image display technology is gradually becoming a research hotspot. The virtual viewpoint synthesis image algorithm required for the naked-view 3D display by using the images captured by the parallax camera is the key technology of the naked-view 3D display processing. [0003] At present, domestic and foreign researches on virtual view synthesis algorithms mainly focus on two aspects: 1) model-based rendering method; 2) image-based rendering method. Both methods have advantages and disadvantages. The image quality synthesized by the method based on model rendering is good, but because this method uses the modeling of the 3D scene to complete t...
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IPC IPC(8): H04N13/00H04N13/04
Inventor 杨光临刘福明王道宪
Owner PEKING UNIV