公开(公告)号：DE69825388D1

公开(公告)日：2004-09-09

申请号：DE69825388

申请日：1998-10-16

Applicant: XEROX CORP

Inventor： FLEET DAVID J ,  HEEGER DAVID J ,  CASS TODD A ,  HECHT DAVID L

IPC: G03G21/04 ,  G06T1/00 ,  H04N1/32 ,  H04N1/387 ,  H04N1/60

公开(公告)号：DE69825388T2

公开(公告)日：2004-12-16

申请号：DE69825388

申请日：1998-10-16

Applicant: XEROX CORP

Inventor： FLEET DAVID J ,  HEEGER DAVID J ,  CASS TODD A ,  HECHT DAVID L

IPC: G03G21/04 ,  G06T1/00 ,  H04N1/32 ,  H04N1/387 ,  H04N1/60

公开(公告)号：JPH11234500A

公开(公告)日：1999-08-27

申请号：JP30177198

申请日：1998-10-23

Applicant: XEROX CORP

Inventor： FLEET DAVID J ,  HEEGER DAVID J ,  CASS TODD A ,  HECHT DAVID L

IPC: G03G21/04 ,  G06T1/00 ,  H04N1/32 ,  H04N1/387

Abstract: PROBLEM TO BE SOLVED: To provide a method of forming a corrected color image by adding an unperceivable signal to an original image without using the original image. SOLUTION: In this machine operation method, a color image I'(x, y) corrected by adding a signal S (x, y) to an original image I(x, y) is generated (210) and a human perception model is used to measure a perception difference ΔE(x, y) between the original color image I(x, y) and the corrected color image I'(x, y) (240), the perception difference ΔE(x, y) and a threshold value are compared to specify an area where the perception difference ΔE(x, y) is perceived by a human observer (270), a signal S (x, y) is attenuated in the area and an unperceivable difference is added to the original color image I(x, y).