公开(公告)号：US20170118475A1

公开(公告)日：2017-04-27

申请号：US15284390

申请日：2016-10-03

Applicant: MediaTek Inc.

Inventor： Tsui-Shan CHANG ,  Yu-Hao HUANG ,  Chih-Kai CHANG ,  Tsu-Ming LIU ,  Chi-Cheng JU ,  Kai-Min YANG

IPC: H04N19/159 ,  H04N19/186 ,  H04N19/85 ,  H04N19/176

CPC classification number: H04N19/56

Abstract: Methods and apparatus of compression for non-stitched pictures captured by multiple cameras of a panoramic video capture device are disclosed. According to one embodiment, the system uses a RIBC (Remapped Intra Block Copy) mode, where the block vector (BV) or BV predictor is remapped using calibration data to reduce the search range. The mapped BV or BVP is also more efficient for coding. A color scaling process can be used with the RIBC mode to compensate the color/brightness discrepancy between images from different cameras. A projection-based Inter prediction method is also disclosed. The projection-based Inter prediction method takes into account different perspectives between two images captured from different cameras. Transform matrix is applied to a block candidate to project the block candidate to a position of a target block. The projected block candidate is used as a predictor for the target block.

公开(公告)号：US20180124312A1

公开(公告)日：2018-05-03

申请号：US15600954

申请日：2017-05-22

Applicant: MEDIATEK INC.

Inventor： Tsui-Shan CHANG ,  Yu-Hao HUANG ,  Chih-Kai CHANG ,  Tsu-Ming LIU

IPC: H04N5/232 ,  G06T3/40 ,  G06T5/00

CPC classification number: H04N5/23238 ,  G06T3/4038 ,  H04N13/128 ,  H04N19/105 ,  H04N19/146 ,  H04N19/176 ,  H04N19/192 ,  H04N19/46 ,  H04N19/597 ,  H04N19/85

Abstract: Methods and apparatus of compression for pre-stitched pictures captured by multiple cameras of a panoramic video capture device are disclosed. At the encoder side, stitching information associated with a stitching process to form the pre-stitched pictures is used to encode a current block according to embodiments of the present invention, where the stitching information comprises calibration data, matching results, seam position, blending level, sensor data, or a combination thereof. In one embodiment, the stitching information corresponds to matching results associated with a projection process, and projection-based Inter prediction is used to encode the current block by projecting a reference block in a reference pre-stitched picture to coordinates of the current block. In another embodiment, the stitching information corresponds to seam information associated with seam detection, and seam-based Inter prediction is used to encode the current block by utilizing the seam information.

公开(公告)号：US20170243384A1

公开(公告)日：2017-08-24

申请号：US15418913

申请日：2017-01-30

Applicant: MEDIATEK INC.

Inventor： Yu-Hao HUANG ,  Tsui-Shan CHANG ,  Yi-Ting LIN ,  Tsu-Ming LIU ,  Kai-Min YANG

IPC: G06T11/60 ,  G06T3/60 ,  G06T3/00

CPC classification number: G06T3/60 ,  G06T3/0093 ,  G06T3/4038 ,  G06T2210/22

Abstract: An image data processing system and associated methods for processing images and methods for image blending are provided. The method for processing panorama images in an image data processing system includes the steps of: receiving a plurality of source images from at least one image input interface, wherein the source images at least include overlapping portions; receiving browsing viewpoint and viewing angle information; determining cropped images of the source images based on the browsing viewpoint and viewing angle information; and generating a panorama image corresponding to the browsing viewpoint and viewing angle information for viewing or previewing based on the cropped images of the source images.