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Title: US4053934: Measuring the quality of images
[ Derwent Title ]

Country: US United States of America

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19 pages

Inventor: Kornreich, Philipp G.; North Syracuse, NY
Kowel, Stephen T.; Liverpool, NY

Assignee: None

Published / Filed: 1977-10-11 / 1975-05-12

Application Number: US1975000576433

IPC Code: Advanced: G02B 7/36; G02B 27/40;
IPC-7: G02F 1/11; H04N 3/14;

ECLA Code: G08B13/196C4; G02B7/36A; G02B27/40; G08B13/196A4; G08B13/196E;

U.S. Class: Current: 348/198; 348/345; 352/140; 356/071; 356/125; 359/290; 382/255; 396/089;
Original: 358/213; 358/227; 350/161.S; 352/140; 354/025;

Field of Search: 03B/13/20 178/7.1,DIG. 29 250/201,234,204,567 350/041,46,161 352/140 353/101 354/025 356/004,71 310/8.1,8.3 355/056 358/213,227 340/146.3 P

Priority Number:
1975-05-12  US1975000576433
1972-12-29  US1972000319680

Abstract:     Method and apparatus for measuring the quality and sharpness of images and for using the measurement results to control parameters such as camera and projector focusing, range finding, optical system modifications and the like. In one embodiment, an image is formed on a medium which has an electrical property that varies predictably with the sharpness of an image incident on it. The property is measured and the derived electrical signal controls automatic focusing of objective and projection lenses, range finder settings, and the like. The invention relies on the discovery of an interaction between images, strain waves and electrical properties in certain devices which allows deriving an electrical signal whose magnitude corresponds to high spatial frequency Fourier components of the image. In addition to other useful characteristics, the electrical signal is at a maximum when the overall sharpness of the image is high and drops off significantly as the image becomes blurred. Alternately, high frequency components of the spatial Fourier transform of images are found by other means, e.g., optically, and the magnitude of these components is used as an indication of the sharpness of the images, and of other parameters of optical systems.

Primary / Asst. Examiners: Martin, John C.;

INPADOC Legal Status: None          Buy Now: Family Legal Status Report

Related Applications:
Application Number Filed Patent Pub. Date  Title
US1974000434102 1974-01-17       
US1974000493990 1974-08-01       
US1974000499606 1974-08-22       
US1972000319680 1972-12-29       

Parent Case:

References to Related Applications
    This application is a continuation-in-part, and hereby incorporates by reference the subject matter, of the following copending patent applications of the same inventors: (1) application Ser. No. 434,102, filed January 17, 1974, now abandoned which is in turn a continuation-in-part of application Ser. No. 319,680, filed December 29, 1972 and now abandoned; (2) application Ser. No. 493,990, filed on August 1, 1974, which is in turn a continuation of said application Ser. No. 319,680; and (3) application Ser. No. 499,606, filed on August 22, 1974, which is in turn a continuation-in-part of (a) said application Ser. No. 434,102, (b) said application Ser. No. 319,680, and (c) application Ser. No. 365,054, filed May 30, 1973 and now 152 No. filed Pat. No. 3,836,712, which is in turn a divisional of said application Ser. No. 319,680. As to any subject matter of said copending applications, which is hereby incorporated by reference, this application claims the benefit of the first filing date of such subject matter in the chain of related applications.

Family: Show 22 known family members

First Claim:
Show all 60 claims
We claim:     1. Apparatus for detecting the sharpness of an image comprising:
  • a medium having a measurable property which varies as a function of the intensity pattern of an image formed thereon and as a function of strain disturbances in the medium;
  • means for forming a selected image on the medium;
  • means for causing a selected strain disturbance in the medium which propagates along the image formed on the medium; and
  • means for measuring said property while the image is formed on the medium and while the selected strain disturbance is present therein and for deriving thereby a signal which is a Fourier transform representation of an aspect of the entire image and which represents the sharpness of the image formed on the medium but is substantially independent of the average intensity of the image formed on the medium and means for utilizing said signal for control purposes.

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Forward References: Show 9 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (9)   |   Backward references (9)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 4pp US2831057  1958-04 Orthuber   Automatic focus adjuster
Get PDF - 10pp US3450018  1969-06 John   AUTOMATIC FOCUSING APPARATUS
Get PDF - 5pp US3450883  1969-06 Thomas   AUTOMATIC FOCUSING APPARATUS
Get PDF - 9pp US3555280  1971-01 Richards  Hycon Manufacturing Co. AUTOMATIC FOCUS SENSOR AND CONTROL
Get PDF - 5pp US3689772  1972-09 George et al.  Litton Systems, Inc. PHOTODETECTOR LIGHT PATTERN DETECTOR
Get PDF - 11pp US3705765  1972-12 Renner  National Research Development Corporation APPARATUS FOR USE IN FOCUSSING IMAGES
Get PDF - 12pp US3781110  1973-12 Leitz et al.  Ernst Leitz GmbH OPTICAL RANGE FINDING SYSTEM
Get PDF - 7pp US3788749  1974-01 George   IMAGE QUALITY RATING SYSTEM
Foreign References: None

Other References:
  • Schneider et al., "Spatial Frequency Range Scanning Using a Zoom Objective", Applied Optics, Aug., 1972, vol. 11, No. 8, p. 1875. Cited by 2 patents

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