Patent US6011607A successfully refreshed from Google Patents.
Patent EP0481768A2 successfully refreshed from Google Patents.
EP0481768A2
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EP
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Encoding apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1991-10-17
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Granted: —
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Expires: 2011-10-17
Abstract
Abstract A maximum value of each block after orthogonal transformation is detected, and an output word length after orthogonal transformation is controlled in accordance with the maximum value thus detected. In addition, a plurality of tables each having a plurality of quantizers combinedly used are prepared and a table is selected in accordance with the maximum value of each block, thereby selecting the optimum quantizer in accordance with the data amount thus generated. <IMAGE>
Inventors
- 👤 Hideki Otaka
- 👤 Masakazu Nishino
- 👤 Tatsuro Juri
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 15:19
CPC Classifications
H; H03; H03M; H03M7/00; H03M7/30; H03M7/3053; H04; H04N; H04N19/00; H04N19/60; H04N19/10; H04N19/102; H04N19/124; H04N19/126; H04N19/134; H04N19/136; H04N19/14; H04N19/146; H04N19/15; H04N19/169; H04N19/17; H04N19/176; H04N19/18; H04N19/186; H04N19/90; H04N19/98
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
An encoding apparatus comprising: blocking means for collecting sampled values of an input signal to obtain blocks of sampled values; orthogonal transformation means for orthogonally transforming sampled values of each block to obtain orthogonal components; detection means for detecting amplitudes of components excepting a direct-current component out of the orthogonal components obtained by said orthogonal transformation means; first quantization means for quantizing said orthogonal components only when an amplitude detected by said detection means exceeds a predetermined value; second quantization means for quantizing data obtained by said first quantization means in accordance with the amplitudes detected by said detection means; and encoder means for encoding data obtained by said second quantization means.
Claim 2
Dependent Claim
20 words
An encoding apparatus as claimed in claim 1, wherein said orthogonal transformation means re-arranges the orthogonal components after orthogonal transformation.
Claim 3
Dependent Claim
28 words
An encoding apparatus as claimed in claim 1 or 2, wherein said detection means detects the orthogonal components simultaneously with the re-arrangement thereof by said orthogonal transformation means.
Claim 4
Dependent Claim
40 words
An encoding apparatus as claimed in claim 1, wherein said detection means detects a maximum value of absolute values of the amplitudes of the components excepting the direct-current component out of the orthogonal components obtained by said orthogonal transformation means.
Claim 5
Dependent Claim
20 words
An encoding apparatus as claimed in claim 1, wherein said encoding means inserts information on the amplitudes in said block.
Claim 6
Dependent Claim
195 words
An encoding apparatus comprising: large blocking means for collecting sampled values of an input signal to obtain large blocks of sampled values; small blocking means for dividing each large block into a plurality of small blocks; orthogonal transformation means for orthogonally transforming each of said plurality of small blocks to obtain orthogonal components; m quantization means for quantizing the orthogonal components obtained by said orthogonal transformation means with m kinds of quantization widths; quantization means table selection means for selecting one of a plurality of quantization means tables each showing a combination of n stages of quantization means selected from said m quantization means for each small block; data amount calculation means for calculating data amount after quantization of each small block by the n stages of quantization means; quantization means selection means for selecting, using the data amount obtained by said data amount calculation means, an optimum quantization width for each small block to make a data amount constant in every large block; quantization means for quantizing said orthogonal components using said optimum quantization width selected by said quantization means selection means; and encoder means for encoding quantized values obtained by said quantization means.
Claim 7
Dependent Claim
38 words
An encoding apparatus as claimed in claim 6, wherein said quantization means table selection means selects a quantization means table in accordance with dynamic range of each of said plurality of small blocks before or after orthogonal transformation.
Claim 8
Dependent Claim
37 words
An encoding apparatus as claimed in claim 6 or 7, wherein said quantization means table selection means selects a different quantization means depending on whether said input signal is either a luminance signal or a chrominance signal.
References Cited (Backward Citations)
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