GB1185910A - Improvements relating to Automatic Character Recognition Systems - Google Patents
Improvements relating to Automatic Character Recognition SystemsInfo
- Publication number
- GB1185910A GB1185910A GB58192/67A GB5819267A GB1185910A GB 1185910 A GB1185910 A GB 1185910A GB 58192/67 A GB58192/67 A GB 58192/67A GB 5819267 A GB5819267 A GB 5819267A GB 1185910 A GB1185910 A GB 1185910A
- Authority
- GB
- United Kingdom
- Prior art keywords
- waves
- plate
- medium
- character recognition
- fingerprint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000001427 coherent effect Effects 0.000 abstract 2
- 230000003287 optical effect Effects 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/16—Processes or apparatus for producing holograms using Fourier transform
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/88—Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters
- G06V10/89—Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters using frequency domain filters, e.g. Fourier masks implemented on spatial light modulators
- G06V10/893—Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters using frequency domain filters, e.g. Fourier masks implemented on spatial light modulators characterised by the kind of filter
- G06V10/895—Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters using frequency domain filters, e.g. Fourier masks implemented on spatial light modulators characterised by the kind of filter the filter being related to phase processing, e.g. phase-only filters
Landscapes
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Character Input (AREA)
- Collating Specific Patterns (AREA)
- Image Input (AREA)
Abstract
1,185,910. Optical filters; holograms. BRITISH AIRCRAFT CORP. Ltd. Dec.23, 1968 [Dec.21, 1967], No.58192/67. Heading G2J. An optical filter having the transmission characteristics of a pattern embossed on the surface of an object (e.g. a fingerprint) is recorded by pressing the object 2 against one side 3 of a partially reflective surface of a rigid transparent medium e.g. glass 1, illuminating the surface by a source of coherent light a, b, collecting the light waves a<SP>1</SP>, b<SP>1</SP>, reflected from the opposite side of the surface 3 against which the object is pressed by a lens 5 which converges the waves on to a photographic plate 6 located in the focal plane of lens 5. The troughs and ridges of the pattern pressed against the surface produce a characteristic variation in the refractive index over the surface and the resulting phase and amplitude variation of waves a<SP>1</SP>, b<SP>1</SP> are recorded on plate 6. In this embodiment the plate 6 records the Fourier transform of the fingerprint XX<SP>1</SP>. To avoid interference between waves reflected from the front surface 4 of medium 1 are those carrying the desired information either the medium must have a suitable thickness or the object surface 3 may be suitably angled. Alternatively a right angle prism may be used with three internal reflections produced. In a further embodiment the source of coherent light may be split to give a reference beam which follows an approximately equivalent path length before being superimposed on the rays a<SP>1</SP>, b<SP>1</SP> on plate 6 to form a hologram. The filter is for use in an optically matched filter character recognition system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB58192/67A GB1185910A (en) | 1967-12-21 | 1967-12-21 | Improvements relating to Automatic Character Recognition Systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB58192/67A GB1185910A (en) | 1967-12-21 | 1967-12-21 | Improvements relating to Automatic Character Recognition Systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1185910A true GB1185910A (en) | 1970-03-25 |
Family
ID=10480992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB58192/67A Expired GB1185910A (en) | 1967-12-21 | 1967-12-21 | Improvements relating to Automatic Character Recognition Systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1185910A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0045917A1 (en) * | 1980-08-11 | 1982-02-17 | Siemens Aktiengesellschaft | Fingerprint sensor delivering an electric signal |
-
1967
- 1967-12-21 GB GB58192/67A patent/GB1185910A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0045917A1 (en) * | 1980-08-11 | 1982-02-17 | Siemens Aktiengesellschaft | Fingerprint sensor delivering an electric signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |