公开(公告)号：US20220172404A1

公开(公告)日：2022-06-02

申请号：US17233195

申请日：2021-04-16

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： Yong Hwan KIM ,  Jieon KIM ,  JinGang HUH ,  Jong-geun PARK

IPC: G06T9/00 ,  G06T3/40 ,  H03M7/30

Abstract: The present disclosure relates to an apparatus and method for fast refining segmentation for a V-PCC encoder. The apparatus may include a grid segmentation unit segmenting a coordinate space of a point cloud into grid units, and an edge cube search unit searching a cube containing one or more points among the cubes segmented into grid units and containing a segment boundary. The apparatus may also include a surrounding cube search unit searching an edge surrounding cube containing one or more points within a predetermined range from the edge cube, and a smooth score calculation unit calculating smooth scores for all the edge surrounding cubes and all the edge cubes. The apparatus may further include a projection plane index update unit obtaining a normal score based on the calculated smooth scores and updating a projection plane index of each point in the edge cube using the normal score.

公开(公告)号：US20200162731A1

公开(公告)日：2020-05-21

申请号：US16424556

申请日：2019-05-29

Applicant: Korea Electronics Technology Institute

Inventor： Yong Hwan KIM ,  Ganzorig GANKHUYAG ,  Jin Woo JEONG

IPC: H04N19/117 ,  H04N19/52 ,  H04N19/139 ,  H04N19/523 ,  H04N19/124 ,  H04N19/82 ,  H04N19/196 ,  H04N19/176

Abstract: There is provided a motion-constrained AV1 encoding method and apparatus for tile-based streaming of an ultra-high definition image, which encodes an image such that the image can be decoded by integrating tile-based segmented images at a bit stream level without modifying an AV1 standard decoder. According to an embodiment of the present disclosure, the motion-constrained encoding method includes: limiting a motion prediction range based on a format and a size of an image; and predicting motion vectors regarding tiles constituting the image, based on the limited motion prediction range. Accordingly, a tile-based streaming service is possible through motion-constrained AV1 encoding of an ultra-high definition image (360 VR image or panorama image). In addition, a consumer electronic device is enabled to integrate and decode segmented images by using a single standard AV1 decoder.

公开(公告)号：US20220166984A1

公开(公告)日：2022-05-26

申请号：US17534988

申请日：2021-11-24

Applicant: Korea Electronics Technology Institute

Inventor： Je Won KANG ,  Eun YEO ,  Yong Hwan KIM ,  Ji Eon KIM

IPC: H04N19/137 ,  H04N19/105 ,  H04N19/597 ,  H04N19/159 ,  H04N19/176

Abstract: Disclosed is a method of predicting a block vector in a multi-view image, the method including allowing an encoder to determine a reference block of a reference image for a specific block of a depth image or a specific-view image among multi-view images, allowing the encoder to determine block vector information for intra block copy (IBC) of the specific block on the basis of a block vector of the reference block when the reference block is encoded using the IBC, and allowing the encoder to encode the block vector information of the specific block. The reference image of the specific view is an image of another view, and the reference image of the depth image is a texture image corresponding to the depth image.

公开(公告)号：US20250150625A1

公开(公告)日：2025-05-08

申请号：US18400399

申请日：2023-12-29

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： Yong Hwan KIM ,  Hyun-Ho KIM ,  Sung-Gyun LIM ,  Yura KIM

IPC: H04N19/597 ,  H04N19/119 ,  H04N19/136 ,  H04N19/172 ,  H04N19/176

Abstract: Proposed are a method and apparatus for adjusting an adaptive patch packing block size of a multi-view video. The method may include receiving an initial patch packing block size as an input, and calculating a width and height of an atlas frame according to the patch packing block size. The method may also include performing patch packing according to the patch packing block size and a size of the atlas frame, and calculating a ratio of the number of valid pixels in patches that are not packed and discarded as a result of the patch packing. The method may further include adjusting adaptively the patch packing block size according to the calculated ratio of the number of valid pixels in the discarded patches, and re-performing the patch packing according to the adjusted patch packing block size.

公开(公告)号：US20250106432A1

公开(公告)日：2025-03-27

申请号：US18545093

申请日：2023-12-19

Applicant: Korea Electronics Technology Institute

Inventor： Yong Hwan KIM ,  Je Won KANG ,  Hyun Ho KIM

IPC: H04N19/597 ,  G06T3/18 ,  G06T5/50 ,  G06V10/44

Abstract: There is provided a multi-view video coding artifact reduction method and system. According to an embodiment, the multi-view video coding artifact reduction method selects reference fames in neighbors of a current frame constituting a multi-view video, derives unidirectional flows and bilateral flows between the current frame and the reference frames, warps the reference frames based on the derived flows, generates intermediate frames by fusing the current frame, the reference frames, and the warped reference frames, and generates a final frame by fusing the current frame and the intermediate frames. Accordingly, image quality of the multi-view video can be more enhanced.

公开(公告)号：US20240195947A1

公开(公告)日：2024-06-13

申请号：US18332596

申请日：2023-06-09

Applicant: KOREA ELECTRONICS TECHNOLOGY INSTITUTE

Inventor： Sung-Gyun LIM ,  Yong Hwan KIM ,  Hyun-Ho KIM ,  Yura KIM

IPC: H04N13/161 ,  H04N19/136

CPC classification number: H04N13/161 ,  H04N19/136

Abstract: A patch based depth mapping method and apparatus for high-efficiency encoding/decoding of a plenoptic video is proposed. The method may be performed in an electronic apparatus to classify a reference image and an additional image from a plenoptic video during encoding the plenoptic video and then generate an atlas including a patch using the additional image. The method may include mapping a depth value by applying minimum-maximum linear scaling in units of an input viewpoint image. The method may also include finding a minimum value and a maximum value of the depth value per the patch and remapping the depth value through minimum-maximum linear scaling.