EP0743794A2
Expired / Lapsed
EP
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Image encoding apparatus and method
Assignee: Canon Inc
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Filing: 1996-05-14
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Granted: —
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Expires: 2016-05-14
Abstract
Abstract It is an object of the invention to perform an efficient encoding which doesn't depend on a nature of an image and, further, to perform an encoding which doesn't need additional information indicative of a prediction method of pixel values. To accomplish the object, an image processing apparatus of the invention is constructed by a forming unit for measuring a feature of a first image and afeature of a second image for a plurality of pixels other than an encode objective pixel, thereby forming a first measurement result and a second measurement result, respectively; and an encoder for determining an encoding method of the encode objective pixel on the basis of a plurality of the first measurement results and a plurality of the second measurement results and for encoding by using the encoding method.
Inventors
- 👤 Yasuji Hirabayashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:58
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/50; H04N19/593
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
85 words
An image processing apparatus comprising: forming means for measuring a feature of a first image and a feature of a second image for a plurality of pixels other than an encode objective pixel, thereby forming a first measurement result and a second measurement result, respectively; and encoding means for determining an encoding method of said encode objective pixel on the basis of a plurality of said first measurement results and a plurality of said second measurement results and for encoding by using said encoding method.
Claim 2
Dependent Claim
25 words
An apparatus according to claim 1, wherein the pixels other than said encode objective pixel are pixels which were encoded before said encode objective pixel.
Claim 3
Dependent Claim
47 words
An apparatus according to claim 1, wherein the feature of said first image and the feature of said second image are correlations among pixel values between the pixels other than said encode objective pixel and one of peripheral pixels of the pixels of said encode objective pixel.
Claim 4
Dependent Claim
40 words
An apparatus according to claim 1, wherein said correlations among the pixel values are obtained on the basis of differences among the pixel values of the pixels other than said encode objective pixel and the peripheral pixels of said pixels.
Claim 5
Dependent Claim
17 words
An apparatus according to claim 1, wherein the encoding by said encoding means is a differential encoding.
Claim 6
Dependent Claim
54 words
An apparatus according to claim 1, wherein in the encoding by said encoding means, the encoding method of said encode objective pixel is determined on the basis of not only said first and second measurement results but also a third measurement result measured in a manner similar to said first and second measurement results.
Claim 7
Dependent Claim
86 words
An image processing method comprising: a forming step of measuring a feature of a first image and a feature of a second image for a plurality of pixels other than an encode objective pixel, thereby forming a first measurement result and a second measurement result, respectively; and an encoding step of determining an encoding method of said encode objective pixel on the basis of a plurality of said first measurement results and a plurality of said second measurement results and encoding by using said encoding method.
Claim 8
Dependent Claim
91 words
An image processing apparatus comprising: forming means for measuring a feature of a first image and a feature of a second image for a plurality of pixels other than an encode objective pixel, thereby forming a first measurement result and a second measurement result, respectively; and decoding means for judging a feature of an image for said encode objective pixel on the basis of a plurality of said first measurement results and a plurality of said second measurement results and for decoding in accordance with said judged feature of the image.
Claim 9
Dependent Claim
92 words
An image processing method comprising: a forming step of measuring a feature of a first image and a feature of a second image for a plurality of pixels other than an encode objective pixel, thereby forming a first measurement result and a second measurement result, respectively; and a decoding step of judging a feature of an image for said encode objective pixel on the basis of a plurality of said first measurement results and a plurality of said second measurement results and decoding in accordance with said judged feature of the image.
Claim 10
Dependent Claim
97 words
An image processing apparatus comprising: output means for outputting a first value indicative of a correlation with a pixel having a first positional relation for peripheral pixels of an encode objective pixel and a second value indicative of a correlation with a pixel having a second positional relation for said peripheral pixels; and encoding means for determining an encoding method of said encode objective pixel on the basis of a plurality of said first values and a plurality of said second values which were outputted by said output means and for encoding by using said encoding method.
Claim 11
Dependent Claim
98 words
An image processing method comprising: an outputting step of outputting a first value indicative of a correlation with a pixel having a first positional relation for peripheral pixels of an encode objective pixel and a second value indicative of a correlation with a pixel having a second positional relation for said peripheral pixels; and an encoding step of determining an encoding method of said encode objective pixel on the basis of a plurality of said first values and a plurality of said second values which were outputted in said outputting step and encoding by using said encoding method.
Claim 12
Dependent Claim
73 words
An image processing apparatus comprising: judging means for judging a first direction having a desired correlation with an encode objective pixel on the basis of pixels other than said encode objective pixel; and encoding means for determining a second direction in accordance with said first direction judged by said judging means and for encoding by using said encode objective pixel and a pixel existing in said second direction of said encode objective pixel.
Claim 13
Dependent Claim
18 words
An apparatus according to claim 12, wherein there is a perpendicular relation between said first and second directions.
Claim 14
Dependent Claim
33 words
An apparatus according to claim 12, wherein a case of using a virtual pixel value exists in a part of pixel values which are used when said judging means judges said first direction.
Claim 15
Dependent Claim
17 words
An apparatus according to claim 12, wherein the encoding by said encoding means is an entropy encoding.
Claim 16
Dependent Claim
41 words
An apparatus according to claim 12, wherein said desired correlation is a correlation between said encode objective pixel and a direction such that an inclination of the pixel value among a plurality of directions from the encode objective pixel is maximum.
Claim 17
Dependent Claim
74 words
An image processing method comprising: a judging step of judging a first direction having a desired correlation with an encode objective pixel on the basis of pixels other than said encode objective pixel; and an encoding step of determining a second direction in accordance with said first direction judged in said judging step and encoding by using said encode objective pixel and a pixel existing in said second direction of said encode objective pixel.
Claim 18
Dependent Claim
73 words
An image processing apparatus comprising: judging means for judging a first direction having a desired correlation with a decode objective pixel on the basis of pixels other than said decode objective pixel; and decoding means for determining a second direction in accordance with said first direction judged by said judging means and for decoding by using said decode objective pixel and a pixel existing in said second direction of said decode objective pixel.
Claim 19
Dependent Claim
74 words
An image processing method comprising: a judging step of judging a first direction having a desired correlation with a decode objective pixel on the basis of pixels other than said decode objective pixel; and a decoding step of determining a second direction in accordance with said first direction judged in said judging step and decoding by using said decode objective pixel and a pixel existing in said second direction of said decode objective pixel.
Claim 20
Dependent Claim
73 words
An image processing apparatus comprising: judging means for judging a contour line of a pixel value corresponding to an encode objective pixel on the basis of pixels other than said encode objective pixel; and encoding means for generating a prediction value by using a plurality of pixel values corresponding to the direction of the contour line of said pixel value and for differentially encoding said encode objective pixel by using said prediction value.
Claim 21
Dependent Claim
74 words
An image processing method comprising: a judging step of judging a contour line of a pixel value corresponding to an encode objective pixel on the basis of pixels other than said encode objective pixel; and an encoding step of generating a prediction value by using a plurality of pixel values corresponding to the direction of the contour line of said pixel value and differentially encoding said encode objective pixel by using said prediction value.
Claim 22
Dependent Claim
45 words
Encoding apparatus for encoding image pixels comprising first means for predicting the value of an object pixel using a plurality of prediction processes, and second means for predicting the value of the object pixel using a process determined by the outcome of said first means.
References Cited (Backward Citations)
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