Patent Number: 7,133,564

Title: Dynamic chain-based thresholding using global characteristics

Abstract: One embodiment relates to an apparatus for image processing. The apparatus includes a candidate edge chain identifier for identifying candidate edge chains in an image being processed, means for calculating a dynamic chain-based threshold function that is dependent on at least one characteristic of the image being processed, and a threshold applicator for applying the dynamic chain-based threshold function to the candidate edge chains. The characteristic of the image being processed may be global in that it is determined from the overall image being processed. A system may include an encoder or a decoder, both of which include the above apparatus. Another embodiment relates to a method for image processing. The method determines a dynamic chain-based threshold function that is dependent on at least one characteristic of the image being processed and applies the dynamic threshold to a candidate edge chain.

Inventors: Ratner; Edward (Sunnyvale, CA), Prakash; Adityo (Redwood Shores, CA), Watanabe; Hitoshi (San Jose, CA), Ahuja; Sachin (Mountain View, CA)

Assignee: Altera Corporation

International Classification: G06K 9/36 (20060101); G06K 9/48 (20060101)

Expiration Date: 2019-11-07 0:00:00