Patent US4007326A successfully refreshed from Google Patents.
US4007326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic copy analysis
Assignee: Xerox Corp
•
Filing: 1976-01-15
•
Granted: 1977-02-08
•
Expires: 1996-01-15
Abstract
Abstract An apparatus for analyzing and comparing the copy quality of the copies of an original to the original. The apparatus includes a 50% transmission/50% reflection mirror, a vidicon for scanning the original and its copy through the mirror, means for reading out the vidicon images of the original and the copy, and means for comaring and analyzing the copy and the original for generating a comparison signal.
Inventors
- 👤 Borg Bernsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:42
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/50; G03G15/5062; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/95; G01N21/956; G01N21/95607; H; H04; H04N; H04N7/00; H04N7/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
208 words
An apparatus for comparing the quality of a copy of a standard pattern to its original, comprising: a vidicon: a substantially half and half transmission/reflection mirror so interposed between said vidicon and the copy and the original that the image of the copy is superimposed on the image of the original formed on said vidicon; means for illuminating the original and the copy in sucession in such a manner that said vidicon forms a video image of the original and a video image of the copy; and, means for comparing the copy image to the original image and generating a comparison signal; said means for comparing and generating a comparison signal includes; a comparator; delay means; first gating means for gating the output of said vidicon to said comparator via said delay means; inverting means for inverting the output of said vidicon; second gating means for gating the output of said inverting means to said comparator; means for actuating said first and second gating means in sucession in synchronization with the illumination of the original and the copy; and, whereby said comparator receives the video images of the original and the copy simultaneously and generating the comparison signal indicative of the difference between the original and the copy.
Claim 2
Independent Claim
208 words
An apparatus for comparing the quality of a copy of a standard pattern to its original, comprising: a vidicon: a substantially half and half transmission/reflection mirror so interposed between said vidicon and the copy and the original that the image of the copy is superimposed on the image of the original formed on said vidicon; means for illuminating the original and the copy in sucession in such a manner that said vidicon forms a video image of the original and a video image of the copy; and, means for comparing the copy image to the original image and generating a comparison signal; said means for comparing and generating a comparison signal includes; a comparator; delay means; first gating means for gating the output of said vidicon to said comparator via said delay means; inverting means for inverting the output of said vidicon; second gating means for gating the output of said inverting means to said comparator; means for actuating said first and second gating means in sucession in synchronization with the illumination of the original and the copy; and, whereby said comparator receives the video images of the original and the copy simultaneously and generating the comparison signal indicative of the difference between the original and the copy.
Claim 3
Dependent Claim
19 words
The apparatus according to claim 1, including computer means for analyzing the comparison signal for rating the copy quality.
Claim 4
Dependent Claim
54 words
The apparatus according to claim 1, wherein said comparing means includes a potentiometer which is so balanced that the output thereof registers zero reading when the video image from the output of said inverting means is in inverse of the video image of the original thereby signifying that the copy is a good quality.
Claim 5
Dependent Claim
51 words
The apparatus according to claim 3, including a video monitor biased to the center of gray scale so that said monitor registers zero difference between the original and copy and registers a difference signal the level of which is proportionate to the degree of degradation of the copy over the original.
Claim 6
Dependent Claim
101 words
The apparatus according to claim 3, wherein the copy and the original are aligned and the video image contrasts are so controlled that in said comparing means the `white` modulated video image from said vidicon via said first gating means cancels out the `black` modulated image output from said inverting means when said copy is of a good quality and wherein said apparatus further includes computer analysis means for analyzing the difference signal produced by said comparing means indicative of the defect in the quality of the copy; and, providing quantified measure of indication of the defect from said difference signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |