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US4776013A
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Method and apparatus of encryption of optical images
Assignee: Rotlex Optics Ltd
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Filing: 1987-04-01
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Granted: 1988-10-04
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Expires: 2007-04-01
Abstract
Abstract A method of encoding an optical image comprises: converting the optical iamge to an image grid comprised of an image matrix of pixels each having at least two possible intensity values; providing a master grid comprised of a master matrix of pixels each having at least two possible intensity values; and transmitting, for each pixel location of the image matrix, a pixel intensity value representing the intensity value of the master matrix at the corresponding location, its complement, or a random intensity value, depending on the intensity value of the pixel in the image matrix at the corresponding location. Also described is an apparatus for carrying out the above encoding method.
Inventors
- 👤 Oded Kafri
- 👤 Eliezer Keren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:56
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/167; H04N7/171; G; G09; G09C; G09C5/00; H04N1/00; H04N1/44; H04N1/448; H04N1/4493
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
99 words
A method of encoding an optical image comprising: converting the optical image to an image grid comprised of an image matrix of pixels each having at least two possible intensity values; providing a master grid comprised of a master matrix of pixels each having at least two possible intensity values; and transmitting, for each pixel location of the image matrix, a pixel intensity value representing the intensity value of the master matrix at the corresponding location, its complement, or a random intensity value, depending on the intensity value of the pixel in the image matrix at the corresponding location.
Claim 2
Independent Claim
99 words
A method of encoding an optical image comprising: converting the optical image to an image grid comprised of an image matrix of pixels each having at least two possible intensity values; providing a master grid comprised of a master matrix of pixels each having at least two possible intensity values; and transmitting, for each pixel location of the image matrix, a pixel intensity value representing the intensity value of the master matrix at the corresponding location, its complement, or a random intensity value, depending on the intensity value of the pixel in the image matrix at the corresponding location.
Claim 3
Dependent Claim
15 words
The method according to claim 1, wherein the master grid is stored in a memorydevice.
Claim 4
Dependent Claim
44 words
The method according to claim 1, wherein the master pixel intensity value is transmitted when the image pixel is of one intensity value, and the complement of the master pixel intensity value is transmitted when the image pixel is of the other intensity value.
Claim 5
Dependent Claim
40 words
The method according to claim 1, wherein the master pixel intensity value is transmitted when the image pixel is of one intensity value, and a random intensity value is transmitted when the master pixel is of the other intensity value.
Claim 6
Dependent Claim
43 words
The method according to claim 1, wherein a random intensity value is transmitted when the image pixel is of one intensity value, and the complement of the master pixel intensity value is transmitted when the image pixel is of the other intensity value.
Claim 7
Dependent Claim
68 words
The method according to claim 1, wherein each pixel has at least three possible intensity values, the master pixel intensity value being transmitted when the image pixel is of one intensity value, a random intensity value being transmitted when the pixel is of the second intensity value, and the complement of the master pixel intensity value being transmitted when the image pixel is of the third intensity value.
Claim 8
Dependent Claim
51 words
The method according to claim 1, wherein said optical image is converted to an image matrix of pixels each having more than three pixel intensity values by grouping a plurality of pixels into groups of superpixels having a number of grey levels increasing with the number of pixels in the superpixel.
Claim 9
Dependent Claim
44 words
A method of encrypting an optical image, comprising: transmitting the encoded optical image in accordance with claim 1; receiving said encoded optical image; and decoding said encoded optical image by combining each pixel of the received matrix with each pixel of said master matrix.
Claim 10
Dependent Claim
18 words
The method according to claim 8, wherein the master grid, during the decoding, is stored in a memory.
Claim 11
Dependent Claim
26 words
The method according to claim 8, wherein the master grid, during the decoding, is in the form of a transparency combined with the encoded image matrix.
Claim 12
Dependent Claim
104 words
Apparatus for encoding an optical image comprising: means for converting the optical image to an image grid comprised of an image matrix of pixels each having at least two possible intensity values; means for storing a master grid comprised of a master matrix of pixels each having at least two possible intensity values; and means for transmitting, for each pixel location of the image matrix, a pixel intensity value representing the intensity value of the master matrix at the corresponding location, its complement, or a random intensity value, depending on the intensity value of the pixel in the image matrix at the corresponding location.
Claim 13
Dependent Claim
104 words
Apparatus for encoding an optical image comprising: means for converting the optical image to an image grid comprised of an image matrix of pixels each having at least two possible intensity values; means for storing a master grid comprised of a master matrix of pixels each having at least two possible intensity values; and means for transmitting, for each pixel location of the image matrix, a pixel intensity value representing the intensity value of the master matrix at the corresponding location, its complement, or a random intensity value, depending on the intensity value of the pixel in the image matrix at the corresponding location.
Claim 14
Dependent Claim
43 words
Apparatus according to claim 11, wherein said latter means transmits the master pixel intensity value when the image pixel is of one intensity value, and the complement of the master pixel intensity value when the image pixel is of the other intensity value.
Claim 15
Dependent Claim
41 words
Apparatus according to claim 11, wherein said latter means transmits the master pixel intensity value when the image pixel is of one intensity value, and a random intensity value is transmitted when the master pixel is of the other intensity value.
Claim 16
Dependent Claim
42 words
Apparatus according to claim 11, wherein said latter means transmits a random intensity value when the image pixel is of one intensity value, and the complement of the master pixel intensity value when the image pixel is of the other intensity value.
Claim 17
Dependent Claim
65 words
Apparatus according to claim 11, wherein each pixel has at least three possible intensity values, said latter means transmitting the master pixel intensity value when the image pixel is of one intensity value, a random intensity value when the pixel is of the second intensity value, and the complement of the master pixel intensity value when the image pixel is of the third intensity value.
Claim 18
Dependent Claim
53 words
Apparatus according to claim 11, wherein said latter means groups the pixels into groups, each constituting a superpixel, which superpixel has a grey level varying according to the number of pixels in each group, to thereby convert the optical image to an image matrix of superpixels each having more than three intensity values.
Claim 19
Dependent Claim
49 words
Apparatus for encrypting an optical image, comprising: means for transmitting the encoded optical image in accordance with claim 11; means for receiving said encoded optical image; and means for decoding said encoded optical image by combining each pixel of the received matrix with each pixel of said master matrix.
Claim 20
Dependent Claim
17 words
Apparatus according to claim 17, wherein the master grid, during the decoding, is stored in a memory.
Claim 21
Dependent Claim
25 words
Apparatus according to claim 17, wherein the master grid, during the decoding, is in the form of a transparency combined with the encoded image matrix.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |