Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2011-08-16
2011-08-16
Le, Que T (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S205000
Reexamination Certificate
active
07999215
ABSTRACT:
When reading the first document sheet, light intensity reference data is acquired by sampling a white reference plate while acquiring light intensity reference auxiliary data indicative of the light intensity of a light source lamp by sampling an auxiliary white reference plate. Then, just before reading the second or subsequent sheet, the auxiliary white reference plate is sampled to acquire the latest light intensity auxiliary data, followed by calculating the change amount from the light intensity reference auxiliary data. The change amount is used to correct the light intensity reference data separately for each picture element by referring to the profile data in which is stored the change amount of the sample value of each picture element corresponding to the change amount of the light intensity, followed by performing the shading compensation. By this configuration, it is possible to perform shading compensation in correspondence with the actual light intensity reduction.
REFERENCES:
patent: 7525693 (2009-04-01), Matsumoto
patent: 2002-033915 (2002-01-01), None
Ebisawa Takashi
Yoshikawa Yukio
Le Que T
Meyer Jerald L.
Richmond Derek
Riso Kagaku Corporation
The Nath Law Group
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