Television – Monitoring – testing – or measuring – Testing of camera
Patent
1998-04-01
2000-01-18
Faile, Andrew I.
Television
Monitoring, testing, or measuring
Testing of camera
348180, 358504, 358518, H04N 1700
Patent
active
060161612
ABSTRACT:
A calibration algorithm is provided for calibrating a machine vision system including a color camera, a framegrabber and an illumination source wherein subsequently acquired images are processed on a pixel-by-pixel basis. After framegrabber offsets are measured to obtain initial or offset calibration data, the camera is pointed at a target monotone patch of known reflectance such as pure white and the camera outputs for red, green and blue are determined while observing the monotone patch to obtain spatial calibration data. The gain for each of the output channels of the color camera is automatically determined from the initial calibration data. Applying the three gain factors to a subsequent image on the pixel-by-pixel basis allows one to end up with a color-corrected image without incurring any time performance penalty. At any time during an inspection process, a small area of white reflectance can be observed. The resulting dynamic white calibration data is used to correct for any medium to long term temporal variation in imaging conditions.
REFERENCES:
patent: 5159185 (1992-10-01), Lehr
patent: 5179437 (1993-01-01), Kawada et al.
patent: 5202767 (1993-04-01), Dozier et al.
patent: 5216504 (1993-06-01), Webb et al.
patent: 5231481 (1993-07-01), Eouzan et al.
patent: 5293225 (1994-03-01), Nishiyama et al.
patent: 5327226 (1994-07-01), Tanabe
patent: 5363318 (1994-11-01), McCauley
patent: 5386299 (1995-01-01), Wilson et al.
patent: 5442408 (1995-08-01), Haruki et al.
patent: 5444481 (1995-08-01), Oshima et al.
patent: 5481302 (1996-01-01), Yamamoto et al.
patent: 5694227 (1997-12-01), Starkweather
patent: 5767980 (1998-06-01), Wang et al.
patent: 5801962 (1998-09-01), Sheu et al.
patent: 5867211 (1999-02-01), Weideman et al.
Bahgi Habte K.
Faile Andrew I.
Medar Inc.
LandOfFree
Method and system for automatically calibrating a color-based ma does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and system for automatically calibrating a color-based ma, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for automatically calibrating a color-based ma will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-566372