Patent · US Expired

Digital photofinishing system including scene balance, contrast normalization, and image sharpening digital image processing

US6097470A · kind A · utility

156Cited by
10References
7Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMay 28, 1998
Grant dateAug 1, 2000
Priority date
Expiry dateMay 28, 2018

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04N1/6094
  • WIPO fieldAudio-visual technology
  • WIPO sectorElectrical engineering

Abstract

A method of digital photofinishing comprising the steps of: producing a digital color image in optical printing densities of a color image captured on photographic media; processing the digital image with a scene balance algorithm to produce a balanced digital color image; using a contrast normalization algorithm, remapping the balanced digital color image to a preferred tone reproduction position; mapping the contrast normalized digital color image through a hard copy media characteristic curve to produce a digital image mapped to print densities of the hard copy media; sharpening the mapped digital color image with a sharpening algorithm optimized to avoid unacceptable artifacts; and digitally printing the sharpened digital color image onto hard copy media.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.