EP0451722A2
Expired / Lapsed
EP
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Image transmission device
Assignee: Canon Inc
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Filing: 1991-04-05
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Granted: —
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Expires: 2011-04-05
Abstract
Abstract An image transmission device is capable of transmitting image data in different resolutions with different pixel number of the image. The gamma correction values are converted in proportion to the transmittal resolution of the image data and the quasi half-tone which closely follows the original image is reproduced with less degree of omission of minute lines.
Inventors
- 👤 Kagami C/O Canon Kabushiki Kaisha Naoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 06:11
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/32; H04N1/333; H04N1/33338; G; G06; G06T; G06T3/00; G06T3/40; H04N1/33307; H04N1/33315; H04N1/40; H04N1/403; H04N1/407
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
84 words
An image transmission device comprising: generating means for generating image data representing an image to be transmitted; processing means for performing a density conversion processing for the image data generated from said generating means; transmission means for transmitting with one of a plural transmission resolutions the image data subjected to the density conversion processing by said processing means; and modification means for modifying a parameter for the density conversion processing by said processing means in accordance with the transmittal resolution by said transmission means.
Claim 2
Dependent Claim
23 words
A device according to claim 1, wherein said transmission means includes determination means for determining the transmittal resolution to meet a transmittal destination.
Claim 3
Dependent Claim
23 words
A device according to claim 1, wherein said processing means is quantizing means for quantizing the image data in accordance with the parameter.
Claim 4
Dependent Claim
28 words
A device according to claim 1, wherein said processing means is conversion means for performing conversion of density characteristic of the image data in accordance with the parameter.
Claim 5
Dependent Claim
22 words
A device according to claim 1, wherein said generating means is reading means for reading the image to form the image data.
Claim 6
Dependent Claim
74 words
An image transmission device comprising: generating means for generating image data representing an image to be transmitted; quantizing means for quantizing the image data generated from said generating means; transmission means for transmitting the image data quantised by said quantizing means with one of a plural transmission resolutions; and modification means for modifying a quantization reference of the image data by said quantizing means in accordance with the tramsmittal resolution by said transmission means.
Claim 7
Dependent Claim
23 words
A device according to claim 6, wherein said transmission means includes determination means for determining the transmittal resolution to meet a transmittal destination.
Claim 8
Dependent Claim
22 words
A device according to claim 6, wherein said generating means is reading means for reading the image to form the image data.
Claim 9
Dependent Claim
51 words
An image transmission method comprising steps of: determining a transmittal resolution of image data; setting a parameter for density conversion of the image data to meet the determined transmittal resolution; and transmitting the image data, whose transmittal density has been converted in accordance with the set parameter, with the determined resolution.
Claim 10
Dependent Claim
21 words
A method according to claim 9, wherein in said determining steps, the transmittal resolution is determined to meet a transmittal destination.
Claim 11
Dependent Claim
32 words
A method according to claim 9, further comprising a quantizing step in which a quantizing processing for the image data is performed in accordance with the parameter set in said setting step.
Claim 12
Dependent Claim
31 words
A method according to claim 9, further comprising a conversion step in which density characteristic of the image data in converted in accordance with the parameter set in said setting step.
Claim 13
Dependent Claim
25 words
A method according to claim 9, further comprising a forming step in which the image to be transmitted is read to form the image data.
Claim 14
Dependent Claim
45 words
An image transmission method comprising steps of: determining a transmittal resolution of image data; setting a reference value for quantization of the image data to meet the determined transmittal resolution; transmitting the image data quantized with the set reference value with the determined transmittal resolution.
Claim 15
Dependent Claim
20 words
A method of claim 14, wherein in said determining steps, the transmittal resolution is determined to meet a transmittal destination.
Claim 16
Dependent Claim
24 words
A method of claim 14, further comprising a forming step in which the image to be transmitted is read to form the image data.
References Cited (Backward Citations)
No citation records indexed.
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