Image preprocessing by modified median filter
First Claim
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1. In a system providing an image represented digitally as a plurality of parallel vectors and in which components of the vectors have values corresponding to the brightness of points of a scene and to noise present therein or occurring in the system, the method of median filtration comprising:
- calculating for each vector of said plurality a vector median value which is the median of the values of predetermined components of the vector; and
when there is a significant difference between the vector median value of one vector of said plurality and the vector median value of the vector of said plurality adjacent to said one vector at one side thereof, subtracting from one component of said one vector the median of the vector median values of said one vector and one or more other vectors included in said plurality and contiguously related to said one vector at said one side thereof.
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Abstract
Preprocessing of a noisy image, such as is obtained by a raster scan, by tracting the median of the pixel values of one or more lines from the medians of predetermined pixel neighborhoods.
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2 Claims
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1. In a system providing an image represented digitally as a plurality of parallel vectors and in which components of the vectors have values corresponding to the brightness of points of a scene and to noise present therein or occurring in the system, the method of median filtration comprising:
calculating for each vector of said plurality a vector median value which is the median of the values of predetermined components of the vector; and
when there is a significant difference between the vector median value of one vector of said plurality and the vector median value of the vector of said plurality adjacent to said one vector at one side thereof, subtracting from one component of said one vector the median of the vector median values of said one vector and one or more other vectors included in said plurality and contiguously related to said one vector at said one side thereof.- View Dependent Claims (2)
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Current Assigneethe united states of america as represented by the secretary of the navy
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Original Assigneethe united states of america as represented by the secretary of the navy
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InventorsMay, Bruce O.
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Primary Examiner(s)Boudreau, Leo H.
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Assistant Examiner(s)NOT, DEFINED
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Application NumberUS06/737,606Time in Patent Office1,047 DaysField of Search382/50, 382/52, 382/54, 382/27, 358/282, 358/284, 358/167, 358/166US Class Current382/262CPC Class CodesG06T 5/20 using local operators
