JPS6467345A - Image forming system - Google Patents
Image forming systemInfo
- Publication number
- JPS6467345A JPS6467345A JP62223119A JP22311987A JPS6467345A JP S6467345 A JPS6467345 A JP S6467345A JP 62223119 A JP62223119 A JP 62223119A JP 22311987 A JP22311987 A JP 22311987A JP S6467345 A JPS6467345 A JP S6467345A
- Authority
- JP
- Japan
- Prior art keywords
- image
- pixel
- outputted
- circuit
- density
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Color, Gradation (AREA)
- Laser Beam Printer (AREA)
- Facsimile Image Signal Circuits (AREA)
- Dot-Matrix Printers And Others (AREA)
Abstract
PURPOSE:To obtain an image forming apparatus always forming a good output image, by mounting a selection means for selecting one of pulse width modulation means on the basis of the detection result of a detection means for detecting the change in the density of the pixel in image data. CONSTITUTION:An operation circuit 3 performs operation on the basis of the pixel density values stored in latches 1, 2 in order to discriminate image tone at every pixel. When the density difference between adjacent pixels is a predetermined value or more, the signal obtained in a system consisting of a gradation correcting circuit 5, a triangle wave generating circuit 6 and a comparator 7 is selected to be outputted and, when said density difference is the predetermined value or less, the signal obtained in a systems consisting of a gradation correcting circuit 8, a triangle wave generating circuit 9 and a comparator 10 is selected to be outputted. As a result, the driving of laser is controlled based on the pulse signal outputted from a multiplexer 11 and an output image is formed through a stage of 'electrostatic image formation development fixing'. Therefore, even when a line image such as a character or mark and an medium contrast image such as a photograph are present in a mixed state, the edge processing suitable for said images is performed and a good output image can be formed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62223119A JP2765838B2 (en) | 1987-09-08 | 1987-09-08 | Image processing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62223119A JP2765838B2 (en) | 1987-09-08 | 1987-09-08 | Image processing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6467345A true JPS6467345A (en) | 1989-03-14 |
JP2765838B2 JP2765838B2 (en) | 1998-06-18 |
Family
ID=16793116
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62223119A Expired - Lifetime JP2765838B2 (en) | 1987-09-08 | 1987-09-08 | Image processing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2765838B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0879516A (en) * | 1994-09-01 | 1996-03-22 | Fuji Xerox Co Ltd | Image processor |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS605669A (en) * | 1983-06-24 | 1985-01-12 | Canon Inc | Multi-value output system |
JPS6239975A (en) * | 1985-08-15 | 1987-02-20 | Canon Inc | Picture processor |
JPS6249780A (en) * | 1985-08-29 | 1987-03-04 | Canon Inc | Picture information processor |
JPS62101177A (en) * | 1985-10-28 | 1987-05-11 | Canon Inc | Picture processor |
-
1987
- 1987-09-08 JP JP62223119A patent/JP2765838B2/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS605669A (en) * | 1983-06-24 | 1985-01-12 | Canon Inc | Multi-value output system |
JPS6239975A (en) * | 1985-08-15 | 1987-02-20 | Canon Inc | Picture processor |
JPS6249780A (en) * | 1985-08-29 | 1987-03-04 | Canon Inc | Picture information processor |
JPS62101177A (en) * | 1985-10-28 | 1987-05-11 | Canon Inc | Picture processor |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0879516A (en) * | 1994-09-01 | 1996-03-22 | Fuji Xerox Co Ltd | Image processor |
Also Published As
Publication number | Publication date |
---|---|
JP2765838B2 (en) | 1998-06-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080403 Year of fee payment: 10 |