US4658284A
Expired / Lapsed
US
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Image forming apparatus
Assignee: Canon Inc
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Filing: 1985-01-02
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Granted: 1987-04-14
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Expires: 2005-01-02
Abstract
Abstract There is disclosed an image forming apparatus for obtaining an image from a television image with 625 horizontal scanning lines with a circuitry substantially same as that for obtaining an image from a television image with 525 horizontal scanning lines. In this apparatus the samples from six scanning lines are converted to form five scanning lines by means of sampling circuit and converting circuit.
Inventors
- 👤 Hideaki Kawamura
- 👤 Nobuaki Sakurada
- 👤 Takashi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:55
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0135
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
146 words
An image forming apparatus comprising: generating means for generating an analog video signal including a large number of horizontal scanning lines; sampling signal generating means for generating a sampling signal to sample said video signal point by point with respect to each horizontal scanning line; analog-digital converting means for converting said analog video signal into a digital value in response to said sampling signal; memory means for storing said digital value; pixel number converting means, including a multiplier unit in which each digital value in said memory means is multiplied by a predetermined coefficient and an adder unit in which the multiplied results of consecutive digital values of said multiplier unit are added for converting six digital values in said memory means into five output values; and image forming means for image formation in response to signals corresponding to said output values of said converting means.
Claim 2
Dependent Claim
146 words
An image forming apparatus comprising: generating means for generating an analog video signal including a large number of horizontal scanning lines; sampling signal generating means for generating a sampling signal to sample said video signal point by point with respect to each horizontal scanning line; analog-digital converting means for converting said analog video signal into a digital value in response to said sampling signal; memory means for storing said digital value; pixel number converting means, including a multiplier unit in which each digital value in said memory means is multiplied by a predetermined coefficient and an adder unit in which the multiplied results of consecutive digital values of said multiplier unit are added for converting six digital values in said memory means into five output values; and image forming means for image formation in response to signals corresponding to said output values of said converting means.
Claim 3
Dependent Claim
17 words
An image forming apparatus according to claim 1, wherein said video signal is a CCIR video signal.
Claim 4
Dependent Claim
19 words
An image forming apparatus according to claim 1, wherein said video signal has 625 horizontal scanning lines per frame.
Claim 5
Dependent Claim
34 words
An image forming apparatus according to claim 1, wherein said video signal is an NTSC signal or a CCIR signal, and the conversion by said converting means is not conducted for said NTSC signal.
Claim 6
Dependent Claim
25 words
An image forming apparatus according to claim 1, wherein said image forming means is adapted to form a hard copy image on a recording medium.
Claim 7
Dependent Claim
18 words
An image forming apparatus according to claim 5, wherein said image forming means includes an ink jet recorder.
Claim 8
Dependent Claim
164 words
An image processing apparatus comprising: input means for inputting an NTSC video signal or a CCIR video signal; sampling signal generating means for generating a sampling signal to sample the video signal point by point with respect to each horizontal scanning line of said NTSC signal or said CCIR signal; analog-digital converting means for converting said analog video signal into a digital value in response to said sampling signal; memory means for storing said digital value; pixel number converting means, including a multiplier unit in which each digital value in said memory means is multiplied by a predetermined coefficient and an adder unit in which the multiplier results of consecutive digital values of said multiplier unit are added for converting the six digital values in said memory means into five output values; and control means adapted to activate said converting means when said video signal is said CCIR video signal and bypass said converting means when said video signal is said NTSC video signal.
Claim 9
Dependent Claim
164 words
An image processing apparatus comprising: input means for inputting an NTSC video signal or a CCIR video signal; sampling signal generating means for generating a sampling signal to sample the video signal point by point with respect to each horizontal scanning line of said NTSC signal or said CCIR signal; analog-digital converting means for converting said analog video signal into a digital value in response to said sampling signal; memory means for storing said digital value; pixel number converting means, including a multiplier unit in which each digital value in said memory means is multiplied by a predetermined coefficient and an adder unit in which the multiplier results of consecutive digital values of said multiplier unit are added for converting the six digital values in said memory means into five output values; and control means adapted to activate said converting means when said video signal is said CCIR video signal and bypass said converting means when said video signal is said NTSC video signal.
Claim 10
Dependent Claim
26 words
An image processing apparatus according to claim 7, further comprising image forming means for forming an image in response to the output of said converting means.
Claim 11
Dependent Claim
25 words
An image processing apparatus according to claim 8, wherein said image forming means is adapted to form a hard copy image on a recording medium.
Claim 12
Dependent Claim
18 words
An image processing apparatus according to claim 9, wherein said image forming means includes an ink jet recorder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |