EP0177640A2
Expired / Lapsed
EP
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Image reduction method
Assignee: International Business Machines Corp
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Filing: 1984-12-11
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Granted: —
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Expires: 2004-12-11
Abstract
Abstract A binary image is reduced in size by method including the steps of: storing the image in bit sequence; dividing the image into transposable blocks; transposing by look up table, for each block having any nonzero data, each group of 6 bits along a first axis to a group fo 5 bits; transposing by look up table, for each block having any nonzero data, each group of 6 bits along a second axis to a group of 5 bits; storing said transposed blocks.
Inventors
- 👤 Frederick Cole Mintzer
- 👤 Karen Louise Anderson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 17:41
CPC Classifications
G; G06; G06T; G06T3/00; G06T3/60; G06T3/602; H; H04; H04N; H04N1/00; H04N1/387; H04N1/393; H04N1/3935
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A method for reducing an image comprising the steps of: storing said image in bit sequence; dividing said image into transposable blocks; transposing for each block having any two bits different, each string of n bits along a first axis to a string of m bits where m is less than n; transposing for each block having any two bits different, each string of i bits along a second axis to a string of j bits where j is less than i; storing said transposed blocks.
Claim 2
Independent Claim
86 words
A method for reducing an image comprising the steps of: storing said image in bit sequence; dividing said image into transposable blocks; transposing for each block having any two bits different, each string of n bits along a first axis to a string of m bits where m is less than n; transposing for each block having any two bits different, each string of i bits along a second axis to a string of j bits where j is less than i; storing said transposed blocks.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein said transposing steps are accomplished by table lookup.
Claim 4
Dependent Claim
14 words
A method according to claim 1 wherein n equals 6 and m equals 5.
Claim 5
Dependent Claim
18 words
A method according to claim 1 further comprising the step of testing each block for all zero bits.
Claim 6
Dependent Claim
18 words
A method according to claim 1 further comprising the step of testing each block for all one bits.
References Cited (Backward Citations)
No citation records indexed.
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