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EP0231020A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method of image signal encoding by orthogonal transformation

Assignee: Fujifilm Holdings Corp
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Filing: 1987-01-27
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Granted: —
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Expires: 2007-01-27
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Abstract

Abstract A method of image signal encoding by orthogonal transformation comprises the steps of obtaining transformed signals by conducting orthogonal transformation on two-dimensional image signals based on a predetermined orthogonal function, and encoding each of the transformed signals with an intrinsic allocated code length. The transformed signal is encoded with a code length obtained by adding an extension code length to the allocated code length when the transformed signal attains a value not smaller than the maximum value within the range encodeable with the allocated code length or a value not larger than the minimum value within the encodeable range.

Inventors

  • 👤 Nobuyuki Fuji Photo Film Co. Ltd. Tanaka

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 17:10
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/10; H04N19/169; H04N19/184; H04N19/102; H04N19/115; H04N19/13; H04N19/134; H04N19/146; H04N19/149; H04N19/15; H04N19/60; H04N19/90; H04N19/91

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 104 words
A method of image signal encoding by orthogonal transformation wherein transformed signals are obtained by conducting orthogonal transformation on two-dimensional image signals based on a predetermined orthogonal function, and each of the transformed signals is encoded with an intrinsic allocated code length, wherein the improvement comprises the step of: encoding the transformed signal with a code length obtained by adding an extension code length to said allocated code length when said transformed signal attains a value not smaller than the maximum value within the range encodeable with said allocated code length or a value not larger than the minimum value within said encodeable range.
Claim 2
Independent Claim 104 words
A method of image signal encoding by orthogonal transformation wherein transformed signals are obtained by conducting orthogonal transformation on two-dimensional image signals based on a predetermined orthogonal function, and each of the transformed signals is encoded with an intrinsic allocated code length, wherein the improvement comprises the step of: encoding the transformed signal with a code length obtained by adding an extension code length to said allocated code length when said transformed signal attains a value not smaller than the maximum value within the range encodeable with said allocated code length or a value not larger than the minimum value within said encodeable range.
Claim 3
Dependent Claim 81 words
A method as defined in Claim 1 wherein said extension code length is adjusted to the same length as said allocated code length, and encoding is conducted by further adding extension code lengths sequentially when said transformed signal is not smaller than the maximum value within the range encodeable with the code length obtained by adding the extension code length to the allocated code length, or when said transformed signal is not larger than the minimum value within said encodeable range.

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