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US 7,127,121 B1Granted
Efficient implementation of a noise removal filter
AssigneeESS Technology, Inc.
InventorShien-Tai Pan
Life of this patent
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Abstract
A method for noise removal filtering is provided. The method includes selecting a characteristic of a test pixel, such as brightness, and comparing the brightness of the test pixel to the brightness of an adjacent pixel. The noise removal filtering is terminated if the test pixel brightness is equal to the adjacent pixel brightness, such that it can be determined that the test pixel has not been corrupted with noise data.
Claims17
A method for noise removal filtering comprising:
- selecting a characteristic of a test pixel;
- comparing the characteristic of the test pixel to a characteristic of a first adjacent pixel;
- comparing the characteristic of the test pixel to a characteristic of a second adjacent pixel;
- generating a flag if the characteristic of the first adjacent pixel and the characteristic of the second adjacent pixel are both different than the characteristic of the test pixel;
- and
- terminating the noise removal filtering if the flag is not generated and thereby indicating that the characteristic of the test pixel is not different than the characteristics of the adjacent pixels.
3 more elements
A system for noise removal filtering comprising:
- a pixel data input receiving a test pixel characteristic and a first adjacent pixel characteristic;
- a filter comparing the test pixel characteristic to the first adjacent pixel characteristic and comparing the test pixel characteristic to a second adjacent pixel characteristic;
- a stage output providing flag output data of a first value if the test pixel characteristic is different than both the first adjacent pixel characteristic and the second adjacent pixel characteristic;
- a noise filter testing stop output providing noise filter testing stop data if the stage output does not provide the flag output data of the first value and thereby indicating that the test pixel characteristic is not different than the adjacent pixel characteristics.
1 more element
A system for noise removal filtering comprising:
- a first adjacent pixel system providing first adjacent pixel data;
- and
- a test pixel compare system coupled to the first adjacent pixel system and comparing the first adjacent pixel data to test pixel data;
- wherein the test pixel compare system further comprises a flag output that includes flag data and the test pixel compare system generates the flag data if the test pixel data is not equal to the first adjacent pixel data, and wherein the test pixel compare system generates a first output that includes noise removal filtering stop data.
1 more element
Dependencies are inferred from the claim text.