Image pickup apparatus
First Claim
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1. An image pickup apparatus comprising:
- a plurality of pixels each including a photoelectric conversion portion which converts an optical signal from an object into an electrical signal and a read portion which reads out the signal from said photoelectric conversion portion to an output line;
a drive control portion which controls a first mode for reading out from said read portion a pixel noise signal which is obtained by resetting an input portion of said read portion, and a second mode for reading out from said read portion an image signal which includes a signal generated by said photoelectric conversion portion;
a correction portion which subjects the image signal read out from said read portion, to correction processing which uses the pixel noise signal;
a detection portion which detects an object condition; and
a switching portion which switches over the correction processing of said correction portion in accordance with an output of said detection portion;
wherein said detection portion detects that a signal level of the pixel noise signal is higher than a predetermined value.
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Abstract
To obtain a high-quality image, there is provided an image pickup apparatus having a plurality of pixels including a photoelectric conversion unit for converting an optical signal from an object into an electrical signal and a read unit for reading out the signal from the photoelectric conversion unit, a difference circuit for performing difference processing on a noise component contained in the signal read by the read unit, a detection circuit for detecting image pickup conditions, and a correction circuit for performing correction of execution of difference processing in accordance with an output from the detection circuit.
48 Citations
1 Claim
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1. An image pickup apparatus comprising:
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a plurality of pixels each including a photoelectric conversion portion which converts an optical signal from an object into an electrical signal and a read portion which reads out the signal from said photoelectric conversion portion to an output line; a drive control portion which controls a first mode for reading out from said read portion a pixel noise signal which is obtained by resetting an input portion of said read portion, and a second mode for reading out from said read portion an image signal which includes a signal generated by said photoelectric conversion portion; a correction portion which subjects the image signal read out from said read portion, to correction processing which uses the pixel noise signal; a detection portion which detects an object condition; and a switching portion which switches over the correction processing of said correction portion in accordance with an output of said detection portion; wherein said detection portion detects that a signal level of the pixel noise signal is higher than a predetermined value.
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Specification
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Current AssigneeCanon Kabushiki Kaisha (Canon Inc.)
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Original AssigneeCanon Kabushiki Kaisha (Canon Inc.)
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InventorsHashimoto, Seiji
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Primary Examiner(s)Ometz, David L.
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Assistant Examiner(s)TRAN, NHAN T
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Application NumberUS09/611,269Time in Patent Office1,951 DaysField of Search348/241, 348/243, 348/248, 348/249, 348/222.1, 250/208.1, 358/443, 358/448, 358/463US Class Current348/241CPC Class CodesH04N 25/627 Detection or reduction of i...
