Three dimensional television camera system based on a spatial depth signal and receiver system therefor

• US 5,283,640 A
• Filed: 01/31/1992
• Issued: 02/01/1994
• Est. Priority Date: 01/31/1992
• Status: Expired due to Fees

• Current Assignee: Homer B. Tilton
• Original Assignee: Homer B. Tilton
• Inventors: Tilton, Homer B.
• Primary Examiner(s): Britton, Howard W.
• Application Number:
  US07/830,238
• Time in Patent Office: 732 Days
• Field of Search: 358/88, 358/89, 358/3, 358/107
• US Class Current: 348/42
• CPC Class Codes: H04N 13/10 Processing, recording or transmission of stereoscopic or multi-view image signals
• CPC Class Codes: H04N 13/207 using a single 2D image sensor
• CPC Class Codes: H04N 13/239 using two 2D image sensors having a relative position equal to or related to the interocular distance H04N13/243 takes precedence
• CPC Class Codes: H04N 13/254 in combination with electromagnetic radiation sources for illuminating objects
• CPC Class Codes: H04N 13/296 Synchronisation thereof; Control thereof
• CPC Class Codes: H04N 13/302 for viewing without the aid of special glasses, i.e. using autostereoscopic displays
• CPC Class Codes: H04N 13/398 Synchronisation thereof; Control thereof

Abstract

A three-dimensional television camera system based on a spatial depth signal and receiver system therefor is disclosed wherein a video depth signal is generated in spatial synchronization with the raster scan of a TV camera viewing a scene. The video depth signal is generated by taking the ratio of the outputs of a pair of spaced apart sensors receiving a reflected laser beam of a laser projector situated between the sensors. The laser projector, sensors, and TV camera are in close proximity to each other. A portion of the energy receiving photocell of each sensor is blocked by a parallax barrier so that a proportion of the reflected laser beam energy is detected and that receipt of energy is angle dependent. By such construction, the depth difference of two points proximate each other is sensed. A continuous video depth signal is outputted in synchrony with the TV camera video signal to the receiver system. The described receiver system employs two TV cathode ray tubes to be viewed stereoscopically, i.e., one for each eye. On CRT operates as in a convention television receiver receiving the TV camera video signal and the other CRT receives the same video signal except the horizontal sweep component is modified by the video depth signal. By such instrumentality, a scene is viewed in three dimensions much like the sell known stereoscope.

Claims

1. A three-dimensional television camera system comprising:

a TV camera for viewing a scene, said TV camera viewing the scene in accordance with its internally generated vertical and horizontal raster scan voltage signals to output a TV video signal; and

means generating a video depth signal, said means operably connected to said TV camera to receive said TV camera internally generated vertical and horizontal raster scan voltage signals, said means including;

a laser projector proximate said TV camera;

a left and right sensor, spaced apart, situated on opposite sides of said laser projector, each said sensor having an output; and

a comparison circuit operably connected to said left and right sensor, said comparison circuit receiving said output from each said sensor and outputting said video depth signal whereby said three-dimensional television camera system outputs said video depth signal and a TV camera video signal for processing by a TV receiver system for three dimensional television viewing.

2. The three-dimensional television camera system as defined in claim 1 wherein said TV camera is operably connected to said laser projector, said laser projector receiving the vertical and horizontal raster scan voltage signals from said TV camera.

3. The three-dimensional television camera system as defined in claim 2 wherein said laser projector includes a laser emitting a directable beam of energy, said laser beam directed in accordance with said vertical and horizontal raster scan voltage signals received from said TV camera, said laser beam in spatial synchronization with said TV camera as the scene is viewed, said laser beam reflected from the scene back to said left and right sensors.

4. The three-dimensional television camera system as defined in claim 3 wherein said comparison circuit receiving said output from each said sensor takes a ratio of said left sensor output to said right sensor output, said ratio operably used to determine said video depth signal.

5. The three-dimensional television camera system as defined in claim 4 wherein said comparison circuit includes a pair of logarithmic amplifiers, a summing amplifier connected to said logarithmic amplifiers, and an antilogarithmic amplifier connected to said summing amplifier, one of each said logarithmic amplifiers receiving an output from either said left or right said sensor and determining its logarithm, said summing amplifier subtracting one logarithm from the other to obtain a difference, and said antilogarithmic amplifier taking the antilogarithm of the difference to determine the ratio of said left sensor output to said right sensor output.

6. The three-dimensional television camera system as defined in claim 5 wherein said comparison circuit further includes a default circuit, said default circuit also receiving each said output from each said sensor, said default circuit generating an output dependent upon one or both said output from each said sensor.

7. The three-dimensional television camera system as defined in claim 6 wherein said output of said default circuit and said output of said antilogarithmic amplifier are subtracted from each other to obtain said video depth signal whereby said video depth signal is either a signal indicative of depth between adjacent points on the scene being viewed or is a default video signal.

8. The three-dimensional television camera system as defined in claim 3 wherein each said left and right sensor contains a laser energy receiving photocell, each said photocell having a surface to receive said laser beam energy reflected from the scene being viewed.

9. The three-dimensional television camera system as defined in claim 8 wherein each said left and right sensor includes a parallax barrier, each said parallax barrier partially shielding each said photocell energy receiving surface.

10. The three-dimensional television camera system as defined in claim 9 wherein said parallax barrier of each said left and right sensor is spaced away from each said photocell energy receiving surface.

11. The three-dimensional television camera system as defined in claim 10 wherein said left sensor photocell is positioned relative to said right sensor photocell and said parallax barrier of said left sensor is positioned relative to said parallax barrier of said right sensor.

12. The three-dimensional television camera system as defined in claim 11 wherein each said left and right sensor outputs an electrical signal proportional to the reflected laser energy received by said partially shielded energy receiving surface of said contained photocell.

13. A three-dimensional television receiver system for viewing a scene in three dimensions comprising:

a first means to receive a TV video signal from a TV camera viewing the scene, said first means processing the received TV video signal, said first means including;

an input circuit, said input circuit receiving the TV video signal from the TV camera, said input circuit outputting a vertical and horizontal synchronization signal;

a first horizontal scan generator connected to said input circuit to receive said horizontal synchronization signal, said first horizontal scan generator outputting a first horizontal scan voltage signal; and

a vertical scan generator connected to said input circuit to receive said vertical synchronization signal, said vertical scan generator outputting a vertical scan voltage signal;

a second means operably connected to said first means to receive the processed TV video signal, said second means additionally receiving a video depth signal, said video depth signal in synchronization with the processed TV video signal received, said second means operably modifying said processed TV video signal in accordance with said video depth signal so received;

said second means including a second horizontal scan generator, said second horizontal scan generator receiving said video depth signal in synchrony with the TV video signal, said second horizontal scan generator also connected to said first horizontal scan generator to receive said first horizontal scan voltage signal, said second horizontal scan generator modifying said first horizontal scan voltage signal in accordance with said video depth signal to output a second horizontal scan voltage signal;

a cathode ray tube display operably connected to said first means to receive the processed TV video signal, said cathode ray tube display also operably connected to said second means to receive said modified processed TV video signals, said cathode ray tube display presenting the scene which when viewed stereoscopically by an observer, takes on aspects of three dimensions.

14. The three-dimensional television receiver system as defined in claim 13 wherein said cathode ray tube display includes:

a left cathode ray tube operably connected to said first horizontal scan generator and said vertical scan voltage generator, said left cathode ray tube receiving said first horizontal scan voltage signal and said vertical scan voltage signal; and

a right cathode ray tube operably connected to said second horizontal scan generator and connected to said vertical scan generator, said right cathode ray tube operably receiving said second horizontal scan voltage signal and said vertical scan voltage signal, said left cathode ray tube presenting the scene in accordance with the TV video signal received from the TV camera and is viewed by the left eye of an observer, and said right cathode ray tube presenting the scene in accordance with the TV video signal received from the TV camera having said horizontal scan voltage signal modified by said video depth signal and is viewed by the right eye of an observer in three-dimensional stereoscopic viewing.

15. In combination, a three-dimensional television camera and receiver system for viewing a scene in three dimensions comprising:

a TV camera for viewing a scene, said TV camera viewing the scene in accordance with its internally generated vertical and horizontal raster scan voltage signals to output a TV video signal;

a first means generating a video depth signal, said first means operably connected to said TV camera to receive said TV camera internally generated vertical and horizontal raster scan voltage signals, said first means including;

a laser projector proximate said TV cameras;

a left and right sensor, spaced apart, situated on opposite sides of said laser projector, each said sensor having an output; and

a comparison circuit operably connected to said left and right sensor, said comparison circuit receiving said output from each said sensor and outputting said video depth signal;

a second means operably connected to said TV camera for receiving said TV video signal, said second means processing the received TV video signal;

a third means operably connected to said second means to receive said processed TV video signal, said third means also operably connected to said first means comparison circuit to receive said video depth signal, said third means modifying said processed TV video signal with said video depth signal; and

a cathode ray tube display operably connected to said second means to receive said processed TV video signal, said cathode ray tube display also operably connected to said third means to receive said modified processed TV video signals, said cathode ray tube display presenting the scene which when viewed stereoscopically by an observer, takes on aspects of three dimensions.

16. The combined three-dimensional television camera and receiver system as defined in claim 15 wherein said laser projector includes a laser emitting a directable beam of energy, and said TV camera operably connected to said first means to receive said TV camera internally generated vertical and horizontal raster scan voltage signal defines said TV camera operably connected to said laser projector to receive said vertical and horizontal raster scan voltages, said vertical and horizontal raster scan voltage signals operably directing said directable beam of energy in spatial synchronization with said TV camera as the scene is viewed, said laser beam reflected from the scene back to said left and right sensors.

17. The combined three-dimensional television camera and receiver system as defined in claim 16 wherein each said left and right sensor contains a laser energy receiving photocell, each said photocell having a surface to receive said laser beam energy reflected from the scene being viewed, and each said left and right sensor includes a parallax barrier, each said parallax barrier of each said left and right sensor spaced away from each said photocell energy receiving surface a predetermined distance, each said parallax barrier partially shielding each said photocell energy receiving surface.

18. The combined three-dimensional television camera and receiver system as defined in claim 17 wherein each said left and right sensor outputs an electrical signal proportional to the reflected laser energy received by said partially shielded energy receiving surface of each said contained photocell, and said comparison circuit receiving each said output from each said sensor takes a ratio of said left sensor output to said right sensor output, said ratio operably used to determine said video depth signal.

19. The combined three-dimensional television camera and receiver system as defined in claim 18 wherein said second means includes:

an input circuit, said input circuit receiving the TV video signal from said TV camera, said input circuit outputting a vertical and horizontal synchronization signal;

a first horizontal scan generator connected to said input circuit to receive said horizontal synchronization signal, said first horizontal scan generator outputting a first horizontal scan voltage signal; and

a vertical scan generator connected to said input circuit to receive said vertical synchronization signal, said vertical scan generator outputting a vertical scan voltage signal; and

said third means includes a second horizontal scan generator, said second horizontal scan generator receiving said video depth signal in synchrony with said TV video signal, said second horizontal scan generator also connected to said first horizontal scan generator to receive said first horizontal scan voltage signal, said second horizontal scan generator modifying said first horizontal scan voltage signal in accordance with said video depth signal to output a second horizontal scan voltage signal.

20. The combined three-dimensional television camera and receiver system as defined in claim 19 wherein said cathode ray tube display includes:

a left cathode ray tube operably connected to said second means first horizontal scan generator and said vertical scan voltage generator, said left cathode ray tube receiving said first horizontal scan voltage signal and said vertical scan voltage signal; and

a right cathode ray tube operably connected to said third means second horizontal scan generator and connected to said second means vertical scan generator, said right cathode ray tube operably receiving said second horizontal scan voltage signal and said vertical scan voltage signal, said left cathode ray tube presenting the scene in accordance with said TV video signal received from said TV camera and is viewed by the left eye of an observer, and said right cathode ray tube presenting the scene in accordance with said TV video signal received from said TV camera having said horizontal scan voltage signal modified by said video depth signal and is viewed by the right eye of an observer in three-dimensional stereoscopic viewing.