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US 6,788,819 B1Granted
Image processing
AssigneeConsignia PLC
InventorsRobert Edward Meredith Swann, Robert Wei Liang Tan, Robert William Young
Life of this patent
Estimating the term…
Abstract
An apparatus for processing images comprise means (2) to scan in an image. The image data is stored and a variance calculator (6) calculates a variance for the scanned image. An image categoriser (16) determines what further processing of the image is appropriate in dependence on the variance.
Claims18
A method for processing an image, said method including the steps of:
- scanning an image to be processed to produce image data;
- storing the image data;
- determining a variance for the stored image data, said step of determining the variance for the stored image data being performed by:
- subdividing the image data into a plurality of blocks of pixels;
- determining a variance for each block of pixels;
- summing the pixel block variances;
- and
- normalizing the result of said summation step to produce a variance for the stored image data;
- and
- based on the determined variance for the stored image data, determining appropriate further processing of the scanned image.
7 more elements
An apparatus for processing an image, said apparatus comprising:
- means for scanning an image to produce image data;
- means for storing the image data that is connected to said means for scanning an image to receive and store the image data;
- means for determining a variance for the scanned image that is connected to said means for storing the image data to receive the stored image data, said means for determining a variance for the scanned image including:
- means for subdividing the image data into a plurality of blocks of pixels;
- means for determining a variance for each block of pixels;
- means for summing the pixel block variances;
- and
- means for normalizing the sum of the pixel block variances to produce the variance for the scanned image;
- and
- means for determining appropriate further processing of the scanned image based on the determined variance for the scanned image.
7 more elements
Dependencies are inferred from the claim text.