
IMAGE PROCESSING
24 February, 1999
2-42
Auto Letter/Photo Separation
In auto text/photo mode, the original image is separated into text and photo areas
(dot screen areas).
"Text" refers to an original or area of an original that contains text and/or line
drawings.
Generally, text areas have strong contrast between the image and the background.
However, photo areas (dot screen areas) have a less extreme range of contrast
levels.
Using these characteristics, the original image is separated into black text areas,
colored text areas, and photo areas. The machine uses the following three
separation methods to detect the different data areas, and the final evaluation
circuit analyzes the output from these three processes to determine the result.
(1) Edge separation
The edges of text and line diagram elements are identified by using the following
characteristics: strong contrast, continuity of black or color pixels, continuity of
white pixels around the black or color pixels
The machine can do this by only referring to the green signal.
Text Area
A259D512.WMF
Edge Separation
Dot Screen Separation
•
Black Text
•
Colored Text
•
Photo
Colored Text Separation
A259D513.WMF
Содержание Aficio Color 4006
Страница 230: ...SP MODE TABLE 24 February 1999 4 2 4 3 SP MODE TABLE See Appendix 2 ...
Страница 359: ...SC TABLE 24 February 1999 7 2 7 2 SC TABLE See APPENDIX 3 ...
Страница 364: ...APPENDIX 1 TIMING CHARTS ...
Страница 369: ...APPENDIX 2 SP MODE TABLE ...
Страница 436: ...APPENDIX 3 SC CODE TABLE ...
Страница 467: ...APPENDIX 4 RSS Remote service system ...
Страница 479: ...7 A259S101 WMF 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Fig 1 ...
Страница 480: ...8 A259S102 WMF 1 2 3 4 5 6 7 8 10 11 12 13 14 9 Fig 2 ...
Страница 481: ...9 A259S103 WMF 1 2 3 4 5 7 8 9 10 11 12 14 15 13 6 16 Fig 3 ...
Страница 482: ...10 A259S151 WMF 1 2 3 4 5 7 8 10 9 6 11 12 13 14 16 17 18 19 15 Fig 4 ...
Страница 483: ...11 A259S105 WMF 1 2 3 4 5 6 7 8 9 10 Fig 5 ...
Страница 484: ...12 A259S106 WMF 1 2 3 4 6 7 8 9 5 Fig 6 ...
Страница 485: ...13 A259S107 WMF 1 2 3 4 5 6 7 8 10 11 9 Fig 7 12 ...