EP0510972A2
Expired / Lapsed
EP
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Image coding method and apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1992-04-23
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Granted: —
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Expires: 2012-04-23
Abstract
Abstract An inter-field motion vector of an interlace scanned inputted image is detected, and, using the detected inter-field motion vector, movements between fields are compensated to constitute a frame, which is then subjected to block coding. Alternatively, an interlace scanned input image is subjected to two-dimensional block division and further an activity of each two-dimensional block is calculated, and, using the activity as an index, the two-dimensional block is divided into either field small blocks constituted by field data or frame small blocks constituted by frame data, and the divided small blocks are coded. By these steps, even the image having a large motion does not invite degradation of image quality, and high efficiency image coding can be realized.
Inventors
- 👤 Toshiya Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 12:32
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/12; H04N19/00; H04N19/50; H04N19/503; H04N19/51; H04N19/527; H04N19/10; H04N19/102; H04N19/103; H04N19/105; H04N19/112; H04N19/134; H04N19/136; H04N19/137; H04N19/60; H04N19/61
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
49 words
An image coding method which comprises the steps of: inputting an interlace scanned image data; detecting an inter-field motion vector of said image data; carrying out an inter-field motion compensation by using said inter-field motion vector to constitute a motion compensated frame; and block coding said motion compensated frame.
Claim 2
Dependent Claim
37 words
An image coding method according to Claim 1, wherein said inter-field motion vector is obtained by detecting N (N: an integer of N ≧ 1) motion vectors between fields, and calculating from said detected N motion vectors.
Claim 3
Dependent Claim
37 words
An image coding method according to Claim 1, wherein said inter-field motion vector is obtained by detecting N (N: an integer of N ≧ 1) motion vectors between frames, and calculating from said detected N motion vectors.
Claim 4
Dependent Claim
60 words
An image coding apparatus comprising: a motion detection circuit for inputting interlace scanned image data to detect an inter-field motion vector of said image data; a motion compensation circuit for carrying out inter-field motion compensation by using said detected inter-field motion vector to constitute a motion compensated frame; and a block coding circuit for block coding said motion compensated frame.
Claim 5
Dependent Claim
65 words
An image coding method which comprises the steps of: inputting an interlace scanned image data; dividing said image data into two dimensional blocks; calculating an activity of said two-dimensional blocks; dividing said two dimensional blocks into either field small blocks constituted by field data or frame small blocks constituted by frame data by using said activity as an index; and coding said divided small blocks.
Claim 6
Dependent Claim
83 words
An image coding method which comprises the steps of: inputting an interlace scanned image data; dividing said image data into two-dimensional blocks; obtaining a difference between said two-dimensional block and a prediction value of said two-dimensional block to make a prediction error two-dimensional block; calculating an activity of said prediction error two-dimensional block; dividing said prediction error two-dimensional block into either field small blocks constituted by field data or frame small blocks constituted by frame data; and coding the said divided small blocks.
Claim 7
Dependent Claim
94 words
An image coding method according to Claim 5 or 6, wherein said activity is made into a difference (Ei - Er) between a total Ei of field small block AC energy constituted by said two-dimensional intra-block field data and a total Er of frame small block AC energy constituted by said two-dimensional intra-block frame data, and said two dimensional block is divided into a field small block when said activity (Ei - Er) is smaller than a constant α, and into a frame small block when the same is larger than the constant α.
Claim 8
Dependent Claim
79 words
An image coding apparatus comprising: a two-dimensional block forming circuit for inputting an interlace scanned image data, and for dividing said image data into two-dimensional blocks; a small block forming circuit for calculating an activity of said two-dimensional blocks, and for using said activity as an index, dividing said two-dimensional block into either field small blocks constituted by field data or frame small blocks constituted by frame data; and a block coding circuit for coding the divided small blocks.
Claim 9
Dependent Claim
128 words
An image coding apparatus comprising: a two dimensional block forming circuit for inputting an interlace scanned image data, and for dividing said image data into two-dimensional blocks; a two-dimensional block forming circuit for dividing said image data into two-dimensional blocks; a prediction circuit for generating a prediction value of said two-dimensional block; a subtractor for calculating a difference between said two-dimensional block and said prediction value to obtain a prediction error two-dimensional block; a small block dividing circuit for calculating an activity of said two-dimensional blocks, and for using said activity as an index, dividing said prediction error two-dimensional block into either field small blocks constituted by field data or frame small blocks constituted by frame data; and a block coding circuit for coding said divided small blocks.
References Cited (Backward Citations)
No citation records indexed.
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