EP0514166A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Image reader
Assignee: Canon Inc
•
Filing: 1992-05-14
•
Granted: —
•
Expires: 2012-05-14
Abstract
Abstract An image reader sets the level of illumination provided by a light source 9 and the gamma correction provided by a density correction circuit 4 in dependence upon a user selected density setting button 52 on a control panel 12. <IMAGE>
Inventors
- 👤 Kazuki C/O Canon Kabushiki Kaisha Tanaka
- 👤 Takayuki C/O Canon Kabushiki Kaisha Ishihara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 12:24
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40056; H04N1/407
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
103 words
An image reader comprising: a light source (9) for illuminating an original image by a controllable quantity of light; read means (1) for reading the original image exposed by said light source to provide an image signal; density conversion means (4) for density converting said image signal in according with a density conversion characteristic; and setting means (11,4) for receiving an image control signal and setting said density conversion characteristic, characterised in that said setting means is adapted for jointly setting said density conversion characteristic and the quantity of light from said light source (9) each in dependence upon said image control signal.
Claim 2
Dependent Claim
23 words
An image reader according to claim 1 wherein said read means (1) is arranged to read an image recorded on a transparent medium.
Claim 3
Dependent Claim
13 words
An image reader according to claim 2, wherein said medium is a film.
Claim 4
Dependent Claim
54 words
An image reader according to claim 1 further comprising means (52,53,12) for generating, as said image control signal, a desired reproduced image density signal, wherein said setting means (11,4) sets the quantity of light from said light source (9) and the conversion characteristic of said conversion means (4) according to said image density signal.
Claim 5
Dependent Claim
51 words
An image reader according to claim 4 in which the said generating means comprises user operable designation means (52) for designating said desired image density signal; and said setting means further comprises control means (11) responsive to the designation means for controlling the quantity of light and the said conversion characteristic.
Claim 6
Dependent Claim
32 words
An image reader according to claim 1 further comprising means (55,12) for generating,as said image control signal, a signal indicating whether the original image is a positive image or a negative image.
Claim 7
Dependent Claim
29 words
An image reader according to claim 6 wherein said generating means comprises user operable designation means (55) for designating an image as a positive image or a negative image.
Claim 8
Dependent Claim
22 words
An image reader according to claim 1 further comprising edge enhancement means (5) for performing edge enhancement processing on said image signal.
Claim 9
Dependent Claim
16 words
An image reader according to claim 1 wherein said conversion means comprises look-up table means (4).
Claim 10
Dependent Claim
101 words
An image reader comprising: read means (1) for reading an original image to provide an image signal; conversion means (4) for density converting said image signal in accordance with a density conversion characteristic; user operable designation means (52) for designating a desired image density setting for said image signal; and characteristic selecting means (4) for storing a plurality of different said conversion characteristics corresponding to different image density settings, characterised by said setting means being arranged so that small changes in the setting of said designation means (52) do not produce corresponding large variations in the appearance of said image signal.
Claim 11
Dependent Claim
78 words
An image reader according to claim 10 wherein said setting means (4) stores data defining the variation of said density conversion characteristic with said image density, and said stored data is such as to define a first designated density region over which the conversion characteristic varies to a first extent with variations in the image density setting, and at least one second region in which said conversion characteristic varies to a second, reduced, extent with image density setting.
Claim 12
Dependent Claim
20 words
An image reader according to claim 11 wherein the conversion characteristic is substantially unvarying in said second region or regions.
Claim 13
Dependent Claim
41 words
An image reader according to claim 10 further comprising a light source (9) for illuminating an original image by a controllable quantity of light, wherein said setting means (4) sets the quantity of light in accordance with the desired image density.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.