Title:
METHOD FOR READING IMAGE AND DEVICE THEREFOR
Document Type and Number:
Japanese Patent JP2768872
Kind Code:
B2
Abstract:
PURPOSE: To guarantee measurement precision and secure a dynamic range by measuring a dark-time output which can not be corrected by primary correc tion in a light cutoff state and performing secondary dark-time output correction by subtraction from an exposure-time output.
CONSTITUTION: The dark-time output voltage V0(I) of part of a chip (I) which constitutes an image sensor means is measured and exposuretime output voltages V(X) of respective elements (X) of the chip are measured to find a primary corrected voltage V1(X) (=V(X)-V0(I)). Then primary corrected dark-time output voltages V10(X) of the respective elements (X) of the chip are measured and converted from analog to digital to find NV10. Further, value NV1(X) from primary exposure-time output voltages V1(X) of the respective elements (X) of the chip by A/D conversion are found and secondary corrected values NV2(X) (=NV1(X)-NV10(X)) are found. An image in an object is read by using the secondary corrected values which are thus obtained.
Inventors:
Makoto Yoshida
Yasuki Hanaoka
Kenji Morimoto
Hitoshi Nakamura
Takayuki Ishizaki
Yasuki Hanaoka
Kenji Morimoto
Hitoshi Nakamura
Takayuki Ishizaki
Application Number:
JP21610992A
Publication Date:
June 25, 1998
Filing Date:
August 13, 1992
Export Citation:
Assignee:
Teijin Limited
International Classes:
G03B42/02; H04N1/40; A61B6/00; H04N1/401; (IPC1-7): G03B42/02; H04N1/401
Domestic Patent References:
| JP63158536A | ||||
| JP63131134A |
Attorney, Agent or Firm:
Maeda Junhiro
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