Patent ID: 7672013
Filing Date: 2010-03-02
Classification: H04N

Abstract:
1. A computer-implemented method for electronically trapping a first digital color image pixel comprising a plurality of colorant values, the method comprising: identifying, with a computer, a trapping window comprising a plurality of pixels that surround the first pixel, each of the surrounding pixels comprising a plurality of colorant values; determining, with the computer, a difference between a sum of magnitudes of differences between colorant values of each of the surrounding pixels and corresponding colorant values of the first pixel, and a magnitude of a sum of differences between colorant values of each of the surrounding pixels and corresponding colorant values of the first pixels to obtain a trigger value for each of the surrounding pixels; adjusting, with the computer, the trigger values according to the distance between the first pixel and each surrounding pixel to obtain a distance adjusted trigger value for each of the surrounding pixels; comparing, with the computer, the adjusted trigger values for each of the surrounding pixels to a trigger threshold; identifying, with a computer, any of the surrounding pixels where the adjusted trigger value for the surrounding pixel exceeds the trigger threshold; identifying, with the computer, a trigger pixel from the surrounding pixels with the adjusted trigger value that exceeds the trigger threshold with a maximum trigger value; and trapping, with the computer, the first pixel based on colorant values of the first pixel and a colorant values of the trigger pixel.