Patent SG-11201807666S-A (SG)
Title: Perspective correction for curved display screens
Inventor: RUSSELL MICHAEL
IPC: G09G3/00
Filed: 2017-03-10
Abstract: NONEST IMAGE OF DISPLAY SCREEN DISPLAYING CHECKERBOARD PATTERI - - RECEIVED? v YES DETECT LOCATIONS OF OUTER POINTS AND FIRST INNER POINTS OF CHECKERBOARD PATTERN INCLUDED IN TEST IMAGE CALCULATE GEOMETRIC PLANE EQUATION BASED ON LOCATIONS OF OUTER POINTS (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (10) International Publication Number (43) International Publication Date WO 2017/156465 Al 14 September 2017 (14.09.2017) WIPO I PCT 1111111111111101110111111111110101111101110111111111111111111111111111111111111110111111 440 450 480 (51) International Patent Classification: G09G 3/00 (2006.01) H04N 17/00 (2006.01) (21) International Application Number: PCT/US2017/021923 (22) International Filing Date: 10 March 2017 (10.03.2017) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 62/306,577 10 March 2016 (10.03.2016) US 15/097,055 12 April 2016 (12.04.2016) US (71) Applicant: NETFLIX, INC. [US/US]; 100 Winchester Circle, Los Gatos, California 95032 (US). (72) Inventor: RUSSELL, Michael; 100 Winchester Circle, Los Gatos, California 95032 (US). (74) Agents: CAREY, John C. et al.; Artegis Law Group, LLP, 7710 Cherry Park Drive, Suite T104, Houston, Texas 77095 (US). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Published: with international search report (Art. 21(3)) (54) Title: PERSPECTIVE CORRECTION FOR CURVED DISPLAY SCREENS (57) : One embodiment of the present invention sets forth a tech- nique for performing perspective correction on one or more test images. The technique includes analyzing a first test image to detect a set of outer points and calculating a geometric plane equation based on the set of outer points. The technique further includes projecting a first set of points associated with a first curved screen model based on the geometric plane equation to generate -420 a second set of points. The technique further includes comparing the second set of points to a set of inner points included in the first test image to determ- ine at least one error value, and determining a screen curvature value based on the at least one error value. GENERATE A 3D CURVED SCREEN MODEL BASED ON A SCREEN CURVATURE VALUE PROJECT, BASED ON GEOMETRIC PLANE EQUATION, LOCATIONS OF SECOND INNER POINTS ASSOCIATED WITH CHECKERBOARD PATTERN OF THE 3D CURVED SCREEN MODEL TO GENERATE PROJECTED POINTS DETERMINE DISTANCE(S) BETWEEN LOCATIONS OF FIRST INNER POINTS AND LOCATIONS OF PROJECTED POINTS DETERMINE ERROR VALUE(S) BASED ON DISTANCE(S) 470 W O 20 17 / 15 6 465 Al YES ADDITIONAL 3D • CURVED SCREEN MODEL? _ NO SCREEN CURVATURE VALUE? 1FES PROCESS CALIBRATION IMAGE(S) BASED ON SCREEN CURVATURE VALUE -- 495 END FIG. 4