Control system for digital de-screening of documents

Details Control system for digital de-screening of documents Control system for digital de-screening of documents

2006-01-03

2006-01-03

Patel, Kanjibhai (Department: 2625)

Image analysis

Image enhancement or restoration

Image filter

C358S003080

Reexamination Certificate

active

06983076

ABSTRACT:
A method and a system for controlling de-screening of documents. The control system is included in a de-screening system including a bank of filters. The filter bank receives an image signal and produces a set of filter output signals. The control system comprises a contrast module, a halftone estimate module and a pixel control module. The contrast module receives a filter output signal from a filter having a large filter span and produces a contrast signal. The halftone estimate module receives the image signal and a filter output signal from a filter having a small filter span and produces an estimated frequency signal and a halftone weight signal. Based on the contrast signal, the estimated frequency signal and the halftone weight signal, the pixel control module produces a control signal which includes information regarding which of the filter output signals are to be blended and the proportion of blending.

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