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IMAGE PROCESSING
A294/A295
2-26
SM
2.3.5 AUTO SHADING
Two things happen during auto shading.
Black Level Correction
The black level is zeroed for each scan line of data by reading the dummy
elements at the end of the CCD signal for each scan line, which should be black.
White Level Correction
The data is corrected for variations in white level across the main scan. To do this,
a white reference plate is scanned before each original (book mode) or every 30 s
(ADF mode). This corrects for the following effects on each pixel:
•
Loss of brightness at the ends of the exposure lamp and the edges of the
lens
•
Variations in sensitivity among the CCD elements
•
Distortions in the light path
A294D645.WMF
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA
Содержание A294
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Страница 3: ...A294 A295 SERVICE MANUAL RICOH GROUP COMPANIES C PIA N O CONTROLADA C PIA N O CONTROLADA...
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Страница 27: ...OVERALL INFORMATION C PIA N O CONTROLADA C PIA N O CONTROLADA...
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Страница 49: ...DETAILED DESCRIPTIONS C PIA N O CONTROLADA C PIA N O CONTROLADA...
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Страница 181: ...INSTALLATION C PIA N O CONTROLADA C PIA N O CONTROLADA...
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Страница 221: ...SERVICE TABLES C PIA N O CONTROLADA C PIA N O CONTROLADA...
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Страница 230: ...SERVICE PROGRAM MODE Rev 9 2001 SM 4 8 A294 A295 C PIA N O CONTROLADA C PIA N O CONTROLADA...
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Страница 323: ...PREVENTIVE MAINTENANCE C PIA N O CONTROLADA C PIA N O CONTROLADA...
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Страница 329: ...REPLACEMENT AND ADJUSTMENT C PIA N O CONTROLADA C PIA N O CONTROLADA...
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Страница 457: ...TROUBLESHOOTING C PIA N O CONTROLADA C PIA N O CONTROLADA...
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Страница 555: ...LARGE CAPACITY TRAY B303 C PIA N O CONTROLADA C PIA N O CONTROLADA...
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Страница 585: ...DIFFERENCES FROM THE A294 I A295 I MODELS C PIA N O CONTROLADA C PIA N O CONTROLADA...
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