EP0357084A1
Expired / Lapsed
EP
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Apparatus for correcting dark signal of image sensor
Assignee: Fujifilm Holdings Corp
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Filing: 1989-09-01
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Granted: —
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Expires: 2009-09-01
Abstract
Abstract An Apparatus for correcting dark signal of an image sensor (8) comprises: a first A/D converter (2) which converts output signals from the image sensor into digital values, an adder (3) which adds the digital values in dark for each pixel, a memory (1) which stores the data from the adder on the result of the addition, a random number generating means (10) which generates a random number so as to be a mean of the stored data in the memory, and a subtracter (4) which subtracts the random number from the digital values at a time of reading of the images and outputs image data.
Inventors
- 👤 Yuji Shimoyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 07:03
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/499; G06F7/49942; G06F7/49947; H; H04; H04N; H04N25/00; H04N25/60; H04N25/63; H04N25/70; H04N25/701
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
An apparatus for correcting dark signal of an image sensor which comprises: a first A/D converter which converts output signals from the image sensor into digital values, an adder which adds the digital values in dark for each pixel, a memory which stores the data from the adder on the result of the addition, a random number generating means which generates a random number so as to be a mean of the stored data in the memory, and a subtracter which subtracts the random number from the digital values at a time of reading of the images and outputs image data.
Claim 2
Independent Claim
101 words
An apparatus for correcting dark signal of an image sensor which comprises: a first A/D converter which converts output signals from the image sensor into digital values, an adder which adds the digital values in dark for each pixel, a memory which stores the data from the adder on the result of the addition, a random number generating means which generates a random number so as to be a mean of the stored data in the memory, and a subtracter which subtracts the random number from the digital values at a time of reading of the images and outputs image data.
Claim 3
Dependent Claim
16 words
An apparatus as claimed in Claim 1, wherein said image sensor comprises a charge coupled device.
Claim 4
Dependent Claim
15 words
An apparatus as claimed in Claim 2, wherein said image sensor is a linear sensor.
Claim 5
Dependent Claim
47 words
An apparatus as claimed in Claim 1, wherein said random number generating means comprises a D/A converter which inputs output data of the memory, and a second A/D converter which inputs an analog signal outputted from the D/A converter and outputs the mean of the stored data.
Claim 6
Dependent Claim
39 words
An apparatus as claimed in Claim 4, wherein the digital values from the first A/D converter are 8 bits, the addition by the adder is repeated for 256 times and the output data of the memory are 16 bits.
References Cited (Backward Citations)
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