US 12,482,093 B2
Image region of interest defect detection
Runzhe Zhang, West Lafayette, IN (US); Yousun Bang, Pangyo (KR); Minki Cho, Pangyo (KR); Mark Shaw, Boise, ID (US); Jan Allebach, West Lafayette, IN (US); and Yi Yang, West Lafayette, IN (US)
Assigned to HEWLETT-PACKA RD DEVELOPMENT COMPANY, LP., Spring, TX (US)
Appl. No. 18/271,209
Filed by HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P., Spring, TX (US); and PURDUE RESEARCH FOUNDATION, West Lafayette, IN (US)
PCT Filed Jan. 13, 2021, PCT No. PCT/US2021/013285
§ 371(c)(1), (2) Date Jul. 6, 2023,
PCT Pub. No. WO2022/154787, PCT Pub. Date Jul. 21, 2022.
Prior Publication US 2025/0278827 A1, Sep. 4, 2025
Int. Cl. G06T 7/00 (2017.01); G06T 5/20 (2006.01); G06T 5/70 (2024.01); G06T 7/11 (2017.01); G06T 7/13 (2017.01); G06T 7/90 (2017.01)
CPC G06T 7/001 (2013.01) [G06T 5/20 (2013.01); G06T 5/70 (2024.01); G06T 7/11 (2017.01); G06T 7/13 (2017.01); G06T 7/90 (2017.01); G06T 2207/10008 (2013.01); G06T 2207/10024 (2013.01); G06T 2207/20032 (2013.01); G06T 2207/30144 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A non-transitory machine-readable medium storing instructions executable by a processor to perform processing comprising:
accessing a master image to be printed;
receiving a scanned image corresponding to the master image;
identifying a color fading defect in a scanned image region of interest (ROI) based on the master image;
determining a severity of the identified color fading defect of the scanned image; and
outputting the determined severity,
wherein identifying the color fading defect comprises:
aligning the scanned image ROI to a corresponding master image ROI, each of the scanned and master image ROIs being a raster image ROI;
segmenting the master image ROI into a plurality of groups of pixels;
extracting select groups of pixels among the plurality of groups of pixels, each of the select groups of pixels having an approximately uniform color;
extracting dominant colors of the select groups of pixels; and
identifying a difference between the extracted dominant colors and corresponding dominant colors in the scanned image.