Patent EP0095560A2 successfully refreshed from Google Patents.
EP0095560A2
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Method for processing image data
Assignee: International Business Machines Corp
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Filing: 1983-03-04
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Granted: —
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Expires: 2003-03-04
Abstract
Abstract in an image processing system, a method is shown for efficiently transmitting data representing picutre information in fields subsequent to a first field and for suppressing motion induced flicker in the processed image. Using previously processed first field data which is used to predict values for picture elements in subsequent fields, a gradient value is calculated which indicates relative picture activity. A difference value for the picture elements in the subsequent fields is calculated and is limited in magnitude by the gradient value for each picture element. The limited difference value is encoded as a function of previous difference value and transmitted to a remote location for decoding and picture reconstruction and display.
Inventors
- 👤 Joan Laverne Mitchell
- 👤 William Boone Pennebaker
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 15:05
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/50; H04N19/503; H04N19/51; G; G06; G06T; G06T7/00; G06T7/20; G06T7/254
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
150 words
1 A method of processing image data in an image display system of the type in which an image is displayed as a sequence of fields, each field being composed of an array of picture elements (pels) having assigned encoded values comprising the steps of calculating a gradient value for each pel in each new field to be displayed from encoded values of corresponding pels in previous fields, calculating a difference value for such pel from an original value for said each pel and a predicted value for each pel, limiting said difference value to said gradient value if said gradient value is less than a predetermined value for each pel, encoding said difference value if said gradient value for said pel is not equal to zero, and reconstructing an image of such new field from said predicted value for each pel and said encoded difference value for each pel.
Claim 2
Dependent Claim
150 words
1 A method of processing image data in an image display system of the type in which an image is displayed as a sequence of fields, each field being composed of an array of picture elements (pels) having assigned encoded values comprising the steps of calculating a gradient value for each pel in each new field to be displayed from encoded values of corresponding pels in previous fields, calculating a difference value for such pel from an original value for said each pel and a predicted value for each pel, limiting said difference value to said gradient value if said gradient value is less than a predetermined value for each pel, encoding said difference value if said gradient value for said pel is not equal to zero, and reconstructing an image of such new field from said predicted value for each pel and said encoded difference value for each pel.
Claim 3
Dependent Claim
58 words
2 A method as claimed in claim 1 further including the steps of quantizing said difference value encoding the quantized difference value if said gradient value for said pel is not equal to zero, and reconstructing an image of said new field from said predicted value for each pel and said encoded quantized difference value for each pel.
Claim 4
Dependent Claim
36 words
3 A method as claimed in claim 1 further including the steps of quantizing said gradient value and limiting said difference value if said quantized gradient value is less than a predetermined value for each pel.
Claim 5
Dependent Claim
27 words
4 A method as claimed in claim 3 further comprising the step of calculating for each said pel and predetermined adjacent pels a maximum quantized gradient value.
Claim 6
Dependent Claim
30 words
5 A method as claimed in claim 4 wherein said difference value is limited if said maximum quantized gradient value is less than a predetermined value for each said pel.
Claim 7
Dependent Claim
20 words
6 A method as claimed in claim 5 further comprising the step of quantizing said difference value for each pel.
Claim 8
Dependent Claim
27 words
7 A method as claimed in claim 6 wherein the quantized difference value is encoded if said gradient value for said pel is not equal to zero.
Claim 9
Dependent Claim
35 words
8 A method as claimed in any preceding claim further comprising the step of transmitting said encoded difference value for each pel to a remote location for reconstruction of said image at said remote location.
Claim 10
Dependent Claim
30 words
9 A method according to claim 8 wherein said difference value for each pel is encloded as a function of a difference value for a previous pel in the field.
Claim 11
Dependent Claim
35 words
10 A method as claimed in claim 8 or claim 9 further comprising the step of transmitting a predetermined code indicative of a blank line if all difference values and limited difference values are zero.
Claim 12
Dependent Claim
33 words
11 A method as claimed in any of claims 8 to 10 comprising the step of transmitting a unique code containing difference values for an adjacent pair of pels having a predetermined relationship.
Claim 13
Dependent Claim
26 words
12 A method as claimed in any preceding claim further comprising the step of storing image data developed for each field for later access and use.
Claim 14
Dependent Claim
42 words
13 A method as claimed in any preceding claim further including the step of correcting errors in said steps of gradient value calculation, difference value calculation, difference limiting, and difference encoding by comparison of bit patterns in the data to be corrected.
Claim 15
Dependent Claim
39 words
14 A method as claimed in any of claims 1 to 12 further comprising the step of correcting errors generated in the calculation of pel gradient values by performing a parity calculation on the data representing each gradient value.
Claim 16
Dependent Claim
20 words
15 An image processing system constructed and adapted to operate in accordance with any one of claims 1 to 14.
References Cited (Backward Citations)
No citation records indexed.
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