 |
|
|
|
|
|
 Title: |
US4053934:
Measuring the quality of images
[ Derwent Title ]
|
| Country: |
US United States of America
|
| |
| 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
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 |
|
|
|
| US0000000434102 | |
|
|
|
| US1972000319680 | 1972-12-29 |
|
|
|
| US0000000493990 | |
|
|
|
| US0000000319680 | |
|
|
|
| US0000000499606 | |
|
|
|
| US0000000434102 | |
|
|
|
| US0000000319680 | |
|
|
|
| US1973000365054 | 1973-05-30 |
|
1974-09-17
|
DIRECT ELECTRONIC FOURIER TRANSFORMS OF OPTICAL IMAGES
|
| US0000000319680 | |
|
|
|
|
|
|
|
|
|
|
| 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.
|
| Background / Summary: |
Show background / summary
|
| Drawing Descriptions: |
Show drawing descriptions
|
| Description: |
Show description
|
| Forward References: |
Show 8 U.S. patent(s) that reference this one
|
|
