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公开(公告)号：US11301953B2
公开(公告)日：2022-04-12
申请号：US16650141
申请日：2018-05-29
发明人： Ronggang Wang , Yueming Wang , Zhenyu Wang , Wen Gao
摘要： Disclosed are a panoramic video asymmetrical mapping method and a corresponding inverse mapping method that include mapping a spherical surface corresponding to a panoramic image or video A onto a two-dimensional image or video B, projecting the spherical surface onto an isosceles quadrangular pyramid with a square bottom plane, and further projecting the isosceles quadrangular pyramid onto a planar surface, using isometric projection on a main viewpoint region in the projection and using a relatively high sampling density to ensure that the video quality of the region of the main viewpoint is high, while using a relatively low sample density for non-main viewpoint regions so as to reduce bit rate. The panoramic video asymmetrical inverse mapping technique provides a method for mapping from a planar surface to a spherical surface, and a planar surface video may be mapped back to a spherical surface for rendering and viewing.
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公开(公告)号：US10681355B2
公开(公告)日：2020-06-09
申请号：US16330923
申请日：2017-07-12
发明人： Zhenyu Wang , Ronggang Wang , Yueming Wang , Wen Gao
IPC分类号： H04N19/167 , H04N19/146 , H04N19/124 , H04N19/172 , H04N19/176
摘要： Disclosed are a describing method and a coding method of panoramic video ROIs based on multiple layers of spherical circumferences. The describing method comprises: first setting a center of the panoramic video ROIs; then setting the number of layers of ROIs as N; obtaining the size Rn of the current layer ROI based on a radius or angle; obtaining the sizes of all of the N layers of ROIs, and writing information such as the center of the ROIs, the number of layers, and the size of each layer into a sequence header of a code stream. The coding method comprises adjusting or filtering an initial QP based on a QP adjusted value and then coding an image. By flexibly assigning code rates to multiple layers of panoramic video ROIs, while guaranteeing a relatively high image quality of ROIs, the code rate needed for coding and transmission is greatly reduced.
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公开(公告)号：US10798301B2
公开(公告)日：2020-10-06
申请号：US16490373
申请日：2017-08-22
发明人： Ronggang Wang , Yueming Wang , Zhenyu Wang , Wen Gao
IPC分类号： H04N7/00 , H04N5/232 , H04N19/182 , H04N19/597 , H04N13/00
摘要： Disclosed is a panoramic image mapping method and a corresponding reversely mapping method. Particularly, the mapping process includes mapping a panoramic image or a spherical surface corresponding to Video A: first, dividing the spherical surface into three areas based on the latitudes of the spherical surface, denoted as Area I, Area II, and Area III, respectively; mapping the three areas to a square plane I′, a rectangular plane II′, and a square plane III′, respectively; then, splicing the planes I′, II′ and III′ into a plane, wherein the resulting plane is the two-dimensional image or video B. Compared with the equirectangular mapping method, the method according to the present disclosure may effectively ameliorate oversampling in high-latitude areas and effectively lower the bit rate needed by coding and the complexity of decoding. The present disclosure relates to the field of virtual reality, which may be applied to panoramic images and videos.
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公开(公告)号：US10796410B2
公开(公告)日：2020-10-06
申请号：US16313731
申请日：2016-12-13
发明人： Ronggang Wang , Yueming Wang , Zhenyu Wang , Wen Gao
摘要： Disclosed is a panoramic image mapping method, wherein mapping regions and a non-mapping region are partitioned for an equirectangular panoramic image with a resolution of 2M×M, where only the partitioned mapping regions are mapped as square regions; the method comprises:, computing a vertical distance and a horizontal distance from a point on the square region to a center of the square region, a larger one of which being denoted as m; computing a distance n from the point to a zeroth (0th) point on a concentric square region; computing a longitude and a latitude corresponding to the point; computing a corresponding position (X, Y) in the equirectangular panoramic image to which the point is mapped; and then assigning a value to the point. The method may effectively reduce oversampling, thereby effectively reducing the number of pixels of the panoramic image and the code rate required for coding with little distortion.
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