Method for eliminating motion induced flicker in a video image
First Claim
1. In a multifield display system, wherein previous field data has been encoded and reconstructed, and wherein a value for each pel in a subsequent field has been predicted from information already encoded,a method of suppressing motion induced flicker and of compressing data in fields subsequent to said previous field in a displayed image, comprising the steps of:
- (a) calculating a gradient value for each pel in said subsequent field from said encoded values of corresponding pels(b) calculating a difference value for each pel in said subsequent field from an original value for said each pel and said predicted value for each pel;
(c) limiting said difference value to said gradient value if said gradient value is less than a predetermined value for each pel;
(d) encoding said difference value if said gradient value for said pel is not equal to zero; and
(e) reconstructing an image of said subsequent field from said predicted value for each pel and said encoded difference value for each pel.
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Abstract
In an image processing system, a method is shown for efficiently transmitting data representing picture 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.
30 Citations
15 Claims
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1. In a multifield display system, wherein previous field data has been encoded and reconstructed, and wherein a value for each pel in a subsequent field has been predicted from information already encoded,
a method of suppressing motion induced flicker and of compressing data in fields subsequent to said previous field in a displayed image, comprising the steps of: -
(a) calculating a gradient value for each pel in said subsequent field from said encoded values of corresponding pels (b) calculating a difference value for each pel in said subsequent field from an original value for said each pel and said predicted value for each pel; (c) limiting said difference value to said gradient value if said gradient value is less than a predetermined value for each pel; (d) encoding said difference value if said gradient value for said pel is not equal to zero; and (e) reconstructing an image of said subsequent field from said predicted value for each pel and said encoded difference value for each pel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification