EP0220069A2
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EP
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Past record correcting/reading apparatus
Assignee: Panasonic System Solutions Japan Co Ltd
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Filing: 1986-10-17
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Granted: —
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Expires: 2006-10-17
Abstract
Abstract A past record correcting/reading apparatus comprises storage circuit means (8) for storing photoelectric conversion information (image information) of the respective photo- sensitive elements corresponding to scanning lines during the past scanning operation; and level control means (9) for controlling quantizing-levels or output levels of photoelectric conversion output signals derived from the respective photo- sensitive elements during the present scanning operation, based upon the past image information read out from the storage circuit means.
Inventors
- 👤 Kazuo Kobayashi
- 👤 Mitsuo Togashi
- 👤 Satoshi Fukuda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 21:51
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/403
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
135 words
A past record correcting/reading apparatus wherein photosensitive elements (1) are aligned or arranged in a plurality of lines, main scanning operation is performed by electronically switching the respective photosensitive elements, and sub-scanning operation is carried out by causing relative movement between an original document (5) and a lens (3), or said photo- sensitive elements by utilizing mechanical means or optical means, characterized by comprising: means (6) for quantizing a photoelectric conversion output signal derived from the respective photo- sensitive elements by present scanning lines: means (8) for storing into a storage circuit a photoelectric conversion output signal derived from the respective photosensitive elements corresponding to past scanning lines during past scanning operation; and means (9) for controlling a quantizing-level of said photoelectric conversion output signal based upon the stored information derived from said storage circuit.
Claim 2
Dependent Claim
135 words
A past record correcting/reading apparatus wherein photosensitive elements (1) are aligned or arranged in a plurality of lines, main scanning operation is performed by electronically switching the respective photosensitive elements, and sub-scanning operation is carried out by causing relative movement between an original document (5) and a lens (3), or said photo- sensitive elements by utilizing mechanical means or optical means, characterized by comprising: means (6) for quantizing a photoelectric conversion output signal derived from the respective photo- sensitive elements by present scanning lines: means (8) for storing into a storage circuit a photoelectric conversion output signal derived from the respective photosensitive elements corresponding to past scanning lines during past scanning operation; and means (9) for controlling a quantizing-level of said photoelectric conversion output signal based upon the stored information derived from said storage circuit.
Claim 3
Dependent Claim
133 words
A past record correcting/reading apparatus wherein photosensitive elements (1) are aligned or arranged in a plurality of lines, main scanning operation is performed by electronically switching the respective photo- sensitive elements, and sub-scanning operation is carried out by relatively transporting an original document (5), a lens (3), or said photosensitive elements by utilizing mechanical means or optical means, characterised by comprising: means (6) for quantizing a photoelectric conversion output signal derived from the respective photo- sensitive elements by present scanning lines: means (8) for storing into a storage circuit a photoelectric conversion output signal derived from the respective photosensitive elements corresponding to past scanning lines during past scanning operation; and means (9) for controlling an output level of said photoelectric conversion output signal based upon the stored information derived from said storage circuit.
Claim 4
Dependent Claim
133 words
A past record correcting/reading apparatus wherein photosensitive elements (1) are aligned or arranged in a plurality of lines, main scanning operation is performed by electronically switching the respective photo- sensitive elements, and sub-scanning operation is carried out by relatively transporting an original document (5), a lens (3), or said photosensitive elements by utilizing mechanical means or optical means, characterised by comprising: means (6) for quantizing a photoelectric conversion output signal derived from the respective photo- sensitive elements by present scanning lines: means (8) for storing into a storage circuit a photoelectric conversion output signal derived from the respective photosensitive elements corresponding to past scanning lines during past scanning operation; and means (9) for controlling an output level of said photoelectric conversion output signal based upon the stored information derived from said storage circuit.
Claim 5
Dependent Claim
53 words
A past record correcting/reading apparatus as claimed in either claim 1 or claim 2, wherein after said photoelectric conversion output signal derived from the photosensitive elements (1) by the present scanning lines is amplified in an amplifier (2), said output signal is converted into a corresponding digital signal by an analog-to-digital converter (6).
Claim 6
Dependent Claim
35 words
A past record correcting/reading apparatus as claimed in any one of the preceding claims, wherein preceding scanning line information is stored in predetermined addresses of a random access memory (RAM) (82) as said storage circuit.
Claim 7
Dependent Claim
37 words
A past record correcting/reading apparatus as claimed in any one of the preceding claims. wherein said plurality of past scanning line information is stored into predetermined addresses of a random access memory (122) as said storage circuit.
Claim 8
Dependent Claim
71 words
A past record correcting/reading apparatus as claimed in any one of claims 2 to 5. wherein a gain of a photoelectric conversion amplification system is controlled by keeping a slice level constant and conducting preceding scanning line information stored in the storage circuit into a gain control circuit (14). and a binary-quantized signal. or a multilevel-quantised signal is produced by changing the image signal level to relative vary the slice level.
Claim 9
Dependent Claim
40 words
A past record correcting/reading apparatus as claimed in any one of claims 1 to 5, wherein an optimum slice level is determined by changing a slice level based upon the past scanning line information, and is employed as said quantizing-level.
Claim 10
Dependent Claim
116 words
A past record correcting/reading apparatus wherein photosensitive elements (1) are aligned or arranged in a plurality of lines, main scanning operation is performed by electronically switching the respective photosensitive elements, and sub-scanning operation is carried out by relatively transporting an original document (5), a lens (3) or said photosensitive elements by utilizing mechanical means or optical means, characterised in that: amplification of the photoelectric conversion signal by said present scanning lines, or a quantizing level thereof is controlled by a difference between the photoelectric conversion output signal derived from the respective photosensitive elements (1) by the present scanning lines and the photosensitive conversion output signal derived from the respective photosensitive elements by the past scanning lines.
Claim 11
Dependent Claim
116 words
A past record correcting/reading apparatus wherein photosensitive elements (1) are aligned or arranged in a plurality of lines, main scanning operation is performed by electronically switching the respective photosensitive elements, and sub-scanning operation is carried out by relatively transporting an original document (5), a lens (3) or said photosensitive elements by utilizing mechanical means or optical means, characterised in that: amplification of the photoelectric conversion signal by said present scanning lines, or a quantizing level thereof is controlled by a difference between the photoelectric conversion output signal derived from the respective photosensitive elements (1) by the present scanning lines and the photosensitive conversion output signal derived from the respective photosensitive elements by the past scanning lines.
Claim 12
Dependent Claim
39 words
A past record correcting/reading apparatus as claimed in any one of the preceding claims, wherein photosensitive elements whose electromotive force. resistance or charged electron is varied with an amount of incident light are employed as said photosensitive elements (1).
Claim 13
Dependent Claim
27 words
A past record correcting reading apparatus as claimed in any one of the preceding claims, wherein a binary-quantized signal is obtained by employing a controlled quantizing level.
Claim 14
Dependent Claim
27 words
A past record correcting/reading apparatus as claimed in any one of the preceding claims, wherein a multi-levelled signal is obtained by employing a plurality of controlled quantizing-levels.
References Cited (Backward Citations)
JPS56102161A
Cited
EP0064557A1
Cited
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