Patent EP0561593A2 successfully refreshed from Google Patents.
EP0561593A2
Expired / Lapsed
EP
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Image compression apparatus
Assignee: Sony Corp
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Filing: 1993-03-15
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Granted: —
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Expires: 2013-03-15
Abstract
Abstract In a picture data processing apparatus, the presence or absence of an edge is detected for each block, and when a block having an edge is detected, a Wavelet transform is employed in transmission of picture data, instead of a discrete cosine transform. In a preferred embodiment, the said Wavelet transform is a Haar transform.
Inventors
- 👤 Takayuki c/o Sony Corporation Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 22:44
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/60; H04N19/63; H04N19/64; H04N19/645; H04N19/10; H04N19/102; H04N19/12; H04N19/122; H04N19/134; H04N19/136; H04N19/14; H04N19/154; H04N19/169; H04N19/17; H04N19/176; H04N19/61; H04N19/146
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
A picture data processing apparatus which transmits inputted picture data after coding for predetermined blocks, comprising: transforming means (8) comprising discrete cosine transform means (14) for discrete cosine transforming said picture data for said each block, characterised by: edge detection means (8, 10) for detecting presence or absence of an edge in said each block; and in that the transforming means (8) further comprises Wavelet transform means (16) for Wavelet transforming said picture data, and in that the transforming means (8) is responsive to the edge detection means (8, 10) to transform the picture data by the discrete cosine transform means (14) when there is no edge and by the Wavelet transform means (16) when there is an edge.
Claim 2
Dependent Claim
28 words
Picture data processing apparatus according to claim 1, wherein said Wavelet transform means (16) comprises Haar transform means for Haar transforming said picture data in said each block.
Claim 3
Dependent Claim
74 words
A picture data processing method, in which inputted picture data is transmitted after coding for predetermined blocks, comprising the step of: discrete cosine transforming said picture data for each said block, characterised by the steps of:- detecting presence of absence of edge in said each block; and selectively: discrete cosine transforming said picture data for said each block, when there is no edge; and Wavelet transforming said picture data, when there is an edge.
Claim 4
Dependent Claim
19 words
A picture data processing method according to claim 3, wherein said Wavelet transform is Haar transform for each block.
References Cited (Backward Citations)
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