EP0446018A2
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EP
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Image processing apparatus
Assignee: Canon Inc
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Filing: 1991-03-05
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Granted: —
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Expires: 2011-03-05
Abstract
Abstract An image processing apparatus comprising binarization means for converting a multi-level color signal into binary form, removal means for removing edge component from the multi-level color signal, based on a binary color signal from said binarization means, and encoder means for encoding the binary color signal from said binarization means and the multi-level color signal having edge component removed with said removal means.
Inventors
- 👤 Hidefumi C/O Canon K. K. Ohsawa
- 👤 Yasuji C/O Canon K. K. Hirabayashi
- 👤 Tadashi C/O Canon K. K. Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 21:46
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/46; H04N1/64; H04N1/642; H03; H03M; H03M7/00; H03M7/02; H03M7/12; H04N19/00; H04N19/30
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
63 words
An image processing apparatus comprising: binarization means for converting a multi-level color signal into binary form; removal means for removing edge component from the multi-level color signal, based on a binary color signal from said binarization means; and encoder means for encoding the binary color signal from said binarization means and the multi-level color signal having edge component removed with said removal means.
Claim 2
Dependent Claim
29 words
An image processing apparatus according to claim 1, wherein said removal means comprises differential means which produces the difference between a binary color signal and a multi-level color signal.
Claim 3
Dependent Claim
26 words
An image processing apparatus according to claim 1, wherein said removal means comprises mask means which masks a multi-level color signal with a binary color signal.
Claim 4
Dependent Claim
23 words
An image processing apparatus according to claim 1, further comprising conversion means for converting the output of said binarization means into specified values.
Claim 5
Dependent Claim
28 words
An image processing apparatus according to claim 4, further comprising control means for controlling the operation of said conversion means in accordance with the information of image area.
Claim 6
Dependent Claim
28 words
An image processing apparatus according to claim 4, further comprising control means for controlling the operation of said conversion means in accordance with the information of encode mode.
Claim 7
Dependent Claim
27 words
An image processing apparatus according to claim 1, wherein said encode means is common encode means for encoding binary color signals and multi-level color signals in sequence.
Claim 8
Dependent Claim
24 words
An image processing apparatus according to claim 1, wherein multi-level color signals are encoded and transmitted after binary color signals are encoded and transmitted.
Claim 9
Dependent Claim
96 words
A color image encode method for encoding a multi-level color image, characterized in that whether image is at edge or non-edge portion is judged for each block of a predetermined size, a binary color image obtained by converting the multi-level color image into binary form for the blocks judged as edge portions, is encoded with the first method, and the difference between the binary color image and the multi-level color image for the blocks judged as edge portions and the multi-level color image for the blocks judged as non-edge portions, are encoded with the second method.
Claim 10
Dependent Claim
36 words
A color image encode method according to claim 9, wherein encoded data with the first method are output at the first stage, and subsequently, encoded data with the second method are output at the second stage.
Claim 11
Dependent Claim
40 words
A color image encode method according to claim 9, wherein said first method is an encode method of laying stress on the preservation of information, while said second method is an encode method of laying stress on the encode efficiency.
Claim 12
Dependent Claim
26 words
A color image encode method according to claim 11, wherein said first method is an entropy encode, while said second method is an orthogonal conversion encode.
Claim 13
Dependent Claim
59 words
An image processing apparatus comprising: first encode means for encoding multi-level color signals within a multi-level color image area in a color image; second encode means for encoding binary color signals outside the multi-level color image area in said color image; and generator means for generating an area signal indicating the multi-level color image area in said color image.
Claim 14
Dependent Claim
41 words
An image processing apparatus according to claim 13, wherein said first encode means performs a first encode of laying stress on the encode efficiency, while said second encode means performs a second encode of laying stress on the preservation of information.
Claim 15
Dependent Claim
25 words
An image processing apparatus according to claim 14, wherein said first encode is an orthogonal conversion encode, while said second encode is an entropy encode.
Claim 16
Dependent Claim
23 words
An image processing apparatus according to claim 13, wherein said area signal indicates the position and size of a multi-level color image area.
Claim 17
Dependent Claim
17 words
An image processing apparatus according to claim 13, wherein said generator means includes manual area designation means.
Claim 18
Dependent Claim
17 words
An image processing apparatus according to claim 17, wherein said manual area designation means includes a monitor.
Claim 19
Dependent Claim
83 words
An image processing apparatus comprising: binarization means for converting a multi-lever color signal into binary form; removal means for removing edge component from the multi-level color signal, based on a binary color signal from said binarization means; and encoder means for encoding the binary color signal from said binarization means and the multi-level color signal having edge component removed with said removal means, wherein said encode means includes a common encode circuit for encoding said binary color signals and said multi-level color signals.
Claim 20
Dependent Claim
29 words
An image processing apparatus according to claim 19, wherein said removal means comprises differential means which produces the difference between a binary color signal and a multi-level color signal.
Claim 21
Dependent Claim
26 words
An image processing apparatus according to claim 19, wherein said removal means comprises mask means which masks a multi-level color signal with a binary color signal.
Claim 22
Dependent Claim
23 words
An image processing apparatus according to claim 19, further comprising conversion means for converting the output of said binarization means into specified values.
Claim 23
Dependent Claim
28 words
An image processing apparatus according to claim 22, further comprising control means for controlling the operation of said conversion means in accordance with the information of image area.
Claim 24
Dependent Claim
28 words
An image processing apparatus according to claim 22, further comprising control means for controlling the operation of said conversion means in accordance with the information of encode mode.
Claim 25
Dependent Claim
27 words
An image processing apparatus according to claim 19, wherein said encode means is common encode means for encoding binary color signals and multi-level color signals in sequence.
Claim 26
Dependent Claim
24 words
An image processing apparatus according to claim 19, wherein multi-level color signals are encoded and transmitted after binary color signals are encoded and transmitted.
Claim 27
Dependent Claim
103 words
An image processing apparatus comprising: binarization means for converting a multi-level color signal into binary form; removal means for removing edge component from the multi-level color signal, based on a binary color signal from said binarization means; and selector means for selecting either an encode mode in which said binarization means and said removal means are operated to encode the binary color signals from said binarization means and the multi-level color signals having edge components removed with said removal means, or a second encode mode in which said binarization means and said removal means are not operated to encode said multi-level color signals.
Claim 28
Dependent Claim
29 words
An image processing apparatus according to claim 27, wherein said removal means comprises differential means which produces the difference between a binary color signal and a multi-level color signal.
Claim 29
Dependent Claim
26 words
An image processing apparatus according to claim 27, wherein said removal means comprises mask means which masks a multi-level color signal with a binary color signal.
Claim 30
Dependent Claim
23 words
An image processing apparatus according to claim 27, further comprising conversion means for converting the output of said binarization means into specified values.
Claim 31
Dependent Claim
29 words
An image processing apparatus according to claim 30, wherein further comprising control means for controlling the operation of said conversion means in accordance with the information of image area.
Claim 32
Dependent Claim
29 words
An image processing apparatus according to claim 30, wherein further comprising control means for controlling the operation of said conversion means in accordance with the information of encode mode.
Claim 33
Dependent Claim
56 words
An image processing method comprising the steps of: scanning and displaying original image on a monitor; designating an area based on the image displayed on said monitor; encoding inside of the specified area with a first method for binary color image; and encoding outside of the specified area with a second method for multi-level color image.
Claim 34
Dependent Claim
21 words
An image processing method according to claim 33, wherein further scanning original image again prior to encoding with said first method.
Claim 35
Dependent Claim
19 words
An image processing method according to claim 33, wherein said area designation is made by means of a digitizer.
Claim 36
Dependent Claim
39 words
An image processing method according to claim 33, wherein said first method is an encode method of laying stress on the preservation of information, while said second method is an encode method of laying stress on the encode efficiency.
Claim 37
Dependent Claim
25 words
An image processing method according to claim 36, wherein said first method is an entropy encode, while said second method is an orthogonal conversion encode.
Claim 38
Dependent Claim
39 words
An image processing apparatus comprising: binarization means for converting a multi-level color signal into binary form and outputting a binary color signal; and encode means for encoding said multi-level color signal and said binary color signal with different methods.
Claim 39
Dependent Claim
53 words
An image encoder comprising means for generating a first signal corresponding to a low bit number representation of the image coded employing redundancy reduction, and a second signal corresponding to the error between said low bit number signal and the image, coded employing quantization to reduce the encoding accuracy at predetermined image frequencies.
Claim 40
Dependent Claim
8 words
A colour facsimile processing apparatus employing arithmetic encoding.
Claim 41
Independent Claim
32 words
A method of predictive encoding of a multi-bit signal, including the step of predicting a higher order bit from the value of a lower order bit or bits of the same pixel.
Claim 42
Dependent Claim
24 words
An image encoding apparatus capable of encoding in a plurality of different modes representing different encoding accuracies, characterized in that said modes are selectable.
Claim 43
Dependent Claim
23 words
Apparatus according to claim 42 in which there are provided means for partitioning an image into areas to be encoded in different modes.
Claim 44
Dependent Claim
20 words
Apparatus according to claim 43 in which there are provided input means for allowing a user to designate said areas.
Claim 45
Dependent Claim
12 words
Use of dynamic arithmetic encoding in facsimile transmission or storage of images.
References Cited (Backward Citations)
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