Parallel optical image processing system

• US 5,129,058 A
• Filed: 06/30/1989
• Issued: 07/07/1992
• Est. Priority Date: 07/06/1988
• Status: Expired due to Term

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Mifune, Hironobu, Inada, Toshio
• Primary Examiner(s): Harkcom, Gary V.
• Assistant Examiner(s): Nguyen, Phu K.
• Application Number:
  US07/374,296
• Time in Patent Office: 1,103 Days
• Field of Search: 364/518, 364/521, 364/522, 364/232.93, 364/936.1, 364/713, 340/747, 340/750, 382/22, 382/25, 395/162
• US Class Current: 345/501
• CPC Class Codes: G06E 1/02 operating upon the order or content of the data handled
• CPC Class Codes: G06N 3/0675 using electro-optical, acousto-optical or opto-electronic means
• CPC Class Codes: G06V 10/88 Image or video recognition using optical means, e.g. reference filters, holographic masks, frequency domain filters or spatial domain filters

Abstract

A parallel optical image processing system comprises a image detection part for detecting an input image, an encoding part supplied with an electrical image signal from the image detection part for producing an encoded input image in a form of optical beam, an optical memory stored with a number of images in a form of encoded image, an optical interconnection part supplied with the encoded input image for addressing the optical memory by deflecting the optical beam so as to read out one of the images stored in the optical memory as an associated image, a first optical path supplied with the encoded input image, a second optical path supplied with the associated image, a decoding part supplied with the encoded input image and the associated image from said first and second optical paths as an encoded output image for decoding the encoded output image thus supplied to form a decoded output image, and feedback control part for controlling the addressing of the memory by the optical interconnection part responsive to the encoded output image.

Claims

1. A parallel optical image processing system, comprising:

a) image detection means for detecting an input image;

b) encoding means, supplied with an electrical image signal from said image detection means, for producing an encoded input image in the form of an optical beam carrying a two-dimensional luminescent pattern corresponding to the encoded input image, said two-dimensional luminescent pattern including a two-dimensional distribution of luminosity representing the input image when viewed in a direction of propagation of the optical beam;

c) optical memory means storing a number of encoded images of objects in the form of a two-dimensional transparent pattern;

d) optical interconnection means, supplied with said encoded input image, for addressing said optical memory means by deflecting the optical beam so as to read out one of the images stored in the optical memory means as an associated image, said associated image including a second optical beam having a second two-dimensional luminescent pattern when viewed in a propagating direction thereof;

e) first optical path means supplied with said encoded input image;

f) second optical path means supplied with the associated image;

g) decoding means, supplied with an encoded output image including a superposed image, the superposed image including a superposition of;

(1) the encoded input image, and

(2) the associated image from said respective

first nd second optical path means;

the decoding means for decoding the encoded output image to form a decoded output image; and

h) feedback control means for controlling the addressing of the memory means by the optical interconnection means responsive to the encoded output image.

2. A system as claimed in claim 1 in which said feedback control means comprises a photodetector array provided so as to receive the encoded output image from the first and second optical path means for producing an electrical control signal as a function of intensity of said encoded output image.

3. A system as claimed in claim 2 in which said photodetector array is coupled with a laser diode array for producing the encoded output image.

4. A system as claimed in claim 2 in which said photodetector array forms a part of said decoding means.

5. A system as claimed in claim 1 in which said feedback control means comprises a first half-mirror provided so as to divert the encoded input image and the associated image incident to the decoding means from said first and second optical paths as a feedback image, a second half-mirror provided between the encoding means and the optical interconnection means, and a third optical path means for passing the feedback image from said first half-mirror to the second half-mirror, said third optical path means comprises an optical threshold means for passing a part of the feedback image having an intensity exceeding a predetermined threshold level.

6. A system as claimed in claim 1, wherein the second optical path means includes:

an optical threshold means for passing an image incident to the optical threshold means is an intensity of a part of the image incident to the optical threshold means exceeds a predetermined threshold level.

7. A system as claimed in claim 1 in which either one of said first optical path means and second optical path means has a phase conjugate mirror for correcting phase of an optical beam reflected back and forth in said phase conjugate mirror.

8. A system as claimed in claim 1 in which branching of said first optical path means from said second optical path means is made by a diffraction grating for diffracting the encoded input image and the associated image to said first optical means as a diffracted image.

9. A system as claimed in claim 1 in which said encoding means comprises edge detection means supplied with the electrical image signal from the image detection means for producing an edge signal corresponding to an edge image of the input image, slope detection means, curvature detection means and line connection pattern detection means respectively supplied with the edge signal from the edge detection means for producing a slope detection signal indicating slope of the input image, a curvature detection signal indicating curvature of the input image and a line connection pattern detection signal indicating pattern of line connection respectively, reconstruction means supplied with the slope detection signal, the curvature detection signal and the line connection pattern signal for producing an encoded image signal, and a laser diode array comprising a plurality of laser diodes arranged in a row and column formation, said laser diode array being supplied with the encoded image signal from said reconstruction means for producing said optical beam with the luminescent pattern representing the encoded input image.

10. A system as claimed in claim 9 in which said edge detection means supplies the edge signal to the reconstruction means as a size signal indicating size of the input image, and said image detection means produces a color signal indicating color of the input image and supplies the color signal to the reconstruction means.

11. A system as claimed in claim 10 in which said encoded input image represents number of objects in the input image, size of the object, form of the object and color of the object.

12. A system as claimed in claim 1 in which said optical memory means comprises a mask defined with a plurality of windows arranged in row and column formation, and each window carries a mask pattern corresponding to encoded image of object which differs in each window.

13. A system as claimed in claim 1, wherein said optical interconnection device includes:

an acousto-optic device driven by an oscillator, the oscillator having an oscillation frequency, said oscillator changing its oscillation frequency under control of the feedback control means.

14. A system as claimed in claim 13 in which said oscillator is controlled by a memory device on the basis of a content of the memory device, and said feedback control means updates the content of the memory device.

15. A system as claimed in claim 13, wherein:

said acousto-optic device is coupled with an electro-optic device controlled by a second memory device on the basis of content of the second memory device; and

said feedback control means updates the content of the second memory device.