公开(公告)号：US09800793B2

公开(公告)日：2017-10-24

申请号：US15296324

申请日：2016-10-18

Applicant: Realtek Semiconductor Corp.

Inventor： Wei-Te Chang ,  Shih-Tse Chen

IPC: H04N5/235 ,  G06T7/40 ,  G06K9/46 ,  G06K9/62

CPC classification number: H04N5/2352 ,  G06K9/4661 ,  G06K9/6215 ,  G06T7/408 ,  G06T7/90

Abstract: A method for generating a target gain value of a wide dynamic range (WDR) operation is disclosed including: acquiring an average bright portion luminance corresponding to an average pixel luminance of a bright portion of a video image; acquiring an average dark portion luminance corresponding to an average pixel luminance of a dark portion of the video image; generating an initial gain value of the WDR operation according to a difference between the average bright portion luminance and the average dark portion luminance; and adjusting the initial gain value according to at least one of a color temperature and an exposure duration configuration value of the video image to generate the target gain value.

公开(公告)号：US10055823B2

公开(公告)日：2018-08-21

申请号：US15291691

申请日：2016-10-12

Applicant: Realtek Semiconductor Corp.

Inventor： Wei-Te Chang ,  Shih-Tse Chen

IPC: G06K9/00 ,  G09G5/02 ,  H04N1/46 ,  H04N9/73 ,  H04N5/46 ,  G06T5/00 ,  H04N1/60 ,  G01J3/50 ,  H04N17/02

CPC classification number: G06T5/005 ,  G01J3/462 ,  G01J3/50 ,  G06T5/007 ,  G06T2207/10024 ,  H04N1/6077 ,  H04N9/73 ,  H04N17/02

Abstract: A method for generating a pixel filtering boundary required by the auto white balance (AWB) calibration is proposed. The method includes: taking a specific color temperature reference point as a center and dividing a G/B-G/R color space into six color regions having different color component relationships; based on a saturation calculating approach of a HSV color space, respectively identifying six color boundaries in the six color regions to generate a specific hexagonal filtering boundary, so that each color boundary has a predetermined saturation difference with the specific color temperature reference point; adopting the approach for generating the specific hexagonal filtering boundary to respectively identify multiple hexagonal filtering boundaries corresponding to other color temperature reference points; generating an enveloping boundary as a pixel filtering boundary based on the specific hexagonal filtering boundary and the multiple hexagonal filtering boundaries.