EP0584741A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Image signal encoding device
Assignee: Fujifilm Business Innovation Corp
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Filing: 1993-08-20
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Granted: —
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Expires: 2013-08-20
Abstract
Abstract An image signal encoding device which includes a code transforming unit. The code transforming unit includes a separation unit which separates mode information from first code data, a locally decoding unit which locally decodes the first code data by means of a decoding operation corresponding to the mode information and outputs locally decoded pixel block, and a second encoding unit which encodes the locally decoded pixel block by means of an encoding operation corresponding to the mode information and outputs second code data. According to the image signal encoding device, the first code data is re-encoded into the second code data having a higher compressibility so as to perform efficient data transmission and storage.
Inventors
- 👤 Kazuhiro Suzuki
- 👤 Yutaka Koshi
- 👤 Koh Kamizawa
- 👤 Setsu Kunitake
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:13
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/24; H04N7/52; H04N7/54; H04N19/00; H04N19/10; H04N19/102; H04N19/117; H04N19/124; H04N19/126; H04N19/169; H04N19/17; H04N19/176; H04N19/18; H04N19/40; H04N19/50; H04N19/59; H04N19/90; H04N19/94; H04N19/13; H04N19/132; H04N19/60; H04N19/91
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
225 words
An image signal encoding device comprising: dividing means for dividing an image signal into a plurality of rectangular pixel blocks; average value separator means for calculating an average value of pixels in each of the pixel blocks and subtracting the average value from each of the values of the pixels of the pixel block; mode discriminator means for analyzing characteristics of resolution and gradation variations in an average value separation pixel block obtained by said average value separator means and outputting mode information which is defined in correspondence to the characteristics of the pixel distribution in the average value separation pixel block; first encoding means for encoding the average value separation pixel block by means of an encoding operation which is defined by the mode information; multiplexer means for multiplexing the encoded results output from said first encoding means, the average value output from said average value separation means, and the mode information and outputting first code data; separation means for separating the mode information from the first code data; locally decoding means for locally decoding the first code data by means of a decoding operation corresponding to the mode information and outputting a locally decoded pixel block; and second encoding means for encoding the locally decoded pixel block by means of an encoding operation corresponding to the mode information and outputting second code data.
Claim 2
Dependent Claim
152 words
The image signal encoding device as set forth in claim 1, wherein said second encoding means comprises: orthogonal transformation means for orthogonally transforming the locally decoded pixel blocks in a two-dimensional manner and outputting a transformed coefficient block; mask information generating means, in accordance with the mode information, for outputting as mask information binary patterns which are used to judge the significance/insignificance of the respective coefficients in the transformed coefficient block; coefficient selecting means for judging the significance/insignificance of the respective coefficients in the transformed coefficient block by use of the mask information and outputting a selected coefficient block in which the transformed coefficients of the transformed coefficient block that are judged insignificant are expressed as 0; quantizing means for quantizing the respective coefficients of the selected coefficient block and outputting a quantized coefficient block; and entropy encoding means for entropy encoding the quantized coefficient block and outputting the second code data.
Claim 3
Dependent Claim
34 words
The image signal encoding device as set forth in claim 1, further comprising storage means for storing the first code data output from said multiplexer means between said multiplexer means and said separation means.
Claim 4
Dependent Claim
34 words
The image signal encoding device as set forth in claim 2, further comprising storage means for storing the first code data output from said multiplexer means between said multiplexer means and said separation means.
Claim 5
Dependent Claim
139 words
An image signal encoding device comprising: mode discriminator means for discriminating mode information of an image signal for each of pixel blocks in a pixel space; first encoding means for encoding image data of the pixel blocks in accordance with modes of said mode discriminator means; transforming means for expressing the first encoded information by a basic waveform in a frequency space of the image signal and a coefficient for the basic waveform; coefficient switching means for switching the coefficient in the frequency space in accordance with the modes of said mode discriminator in the pixel space; and second encoding means for encoding, in the frequency space, the encoded results with respect to the image data of the pixel block that are output from said first encoding means in accordance with a coefficient set by said coefficient switching means.
Claim 6
Dependent Claim
25 words
The image signal encoding device as set forth in claim 5, further comprising storage means for storing the encoded results from said first encoding means.
Claim 7
Dependent Claim
43 words
The image signal encoding device as set forth in claim 5, wherein the encoded results from said first encoding means are in the form of data which include the mode information, and the average value and approximate block information of the pixel block.
Claim 8
Independent Claim
125 words
A method of encoding an image signal, comprising the steps of: discriminating mode information for each of pixel blocks of the image signal in a pixel space; first encoding image data of the pixel block in the pixel space in accordance with the modes obtained in said discriminating step; expressing the first encoded information by a basic waveform in a frequency space of the image signal and a coefficient for the basic waveform; switching the coefficient in the frequency space in accordance with the modes obtained in said discriminating step in the pixel space; and second encoding the encoding results in said first encoding step with respect to the image data of the pixel block in accordance with a coefficient set in said switching step.
References Cited (Backward Citations)
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