Video endoscope system for use with different sizes of solid state devices

• US 4,816,909 A
• Filed: 12/16/1987
• Issued: 03/28/1989
• Est. Priority Date: 12/17/1986
• Status: Expired due to Term

• Current Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Original Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Inventors: Sasagawa, Katuyoshi, Hasegawa, Jun, Yamashita, Shinji, Hibino, Hiroki, Kimura, Kenji, Uchikubo, Akinobu, Sasaki, Masahiko, Uehara, Masao, Kanno, Masahide
• Primary Examiner(s): Groody, James J.
• Assistant Examiner(s): Kostak, Victor R.
• Application Number:
  US07/134,627
• Time in Patent Office: 468 Days
• Field of Search: 358/98, 358/166, 358/37, 358/29, 128/4, 128/6
• US Class Current: 348/71
• CPC Class Codes: A61B 1/00006 of control signals
• CPC Class Codes: A61B 1/045 Control thereof
• CPC Class Codes: H04N 23/125 Colour sequential image capture, e.g. using a colour wheel
• CPC Class Codes: H04N 23/555 for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes

Abstract

An endoscope contains or is externally fitted with a color imaging device using a solid state imaging device and a signal processing device processing a signal for the endoscope. The color imaging device and solid state imaging device are provided so that the number of pixels and the kind of spectral characteristic of the color imaging device of the endoscope to be connected may be discriminated to process the signal even for the endoscopes having number of pixels and the spectral characteristic.

Claims

1. A video endoscope system comprising:

an electronic scope comprising

an elongated insertable part,

an illuminating light output means outputting an illuminating light out of the tip side of said insertable part,

an imaging means formed of a solid state imaging device and having a function of imaging an object illuminated by said illuminating light output means,

a signal transmitting cable connected with said solid state imaging device, and

a signal connector fitted to the end part of said signal transmitting cable;

a driving signal generating means applying a driving signal to said solid state imaging device by connecting said signal connector;

a signal processing circuit means processing a signal read out of said solid state imaging device by the application of said driving signal;

a displaying means displaying the video image of the object by a video signal output out of said signal processing circuit means;

an information signal generating means provided in said electronic scope and generating an information signal relating to the number of pixels of said solid state imaging device;

a controlling signal generating means decoding said information signal and outputting a controlling signal corresponding to said information signal; and

a signal processing characteristic varying means forming said signal processing circuit means and varying the signal processing characteristic to correspond to the number of pixels by the application of said controlling signal.

2. A system according to claim 1 wherein said signal processing characteristic varying means varies the timing of the low-pass filter means cutting off the signal band side corresponding to said number of pixels and of the clamping pulse and sampling pulse of the double sampling circuit removing the resetting noise in the signal read out of said solid state imaging device.

3. A system according to claim 2 wherein, in case a memory means memorizing the signal output out of said solid state imaging device is within said signal processing circuit means by said controlling signal, said signal processing characteristic varying means will switch the timing frequency of at least one of write-in/read-out in said memory means in response to the number of pixels elements.

4. A system according to claim 3 wherein said controlling signal further varies the enhancing amount of the horizontal/vertical outline enhancing circuit in response to said number of pixels.

26. A system according to any of claim 1, 5, 6 or 7 wherein said electronic scope is of a built-in color filter type.

27. A system according to any of claims 1, 5, 6 or 7 wherein said electronic scope is of a frame sequential imaging system having no built-in color filter.

28. A system according to any of claims 1, 5, 6, 7, 9, 10 or 11 wherein said signal processing circuit means is to make a frame sequential signal processing of producing a video signal which can be color-displayed by said displaying means for the signal output out of said imaging means under a frame sequential illumination.

29. A system according to claim 28 wherein said signal processing circuit means has a first low-pass filter means cutting off unnecessary higher harmonics, and A/D converting means A/D converting the signal passed through said low-pass filter means, a digital memory means once memorizing the digital signal passed through this A/D converter, a D/A converting means D/A converting the digital signal read out of said digital memory means and a second low-pass filter means cutting off the higher harmonics of the analogue signal by said D/A converting means.

30. A system according to claim 29 herein said signal processing circuit means further has a resetting noise removing double sampling circuit arranged on the front step side of said first low-pass filter means and a horizontal/vertical outline enhancing circuit provided on the rear step side of said second low-pass filter means.

31. A system according to any of claims 1, 5, 6, 7, 9, 10 or 11 wherein said signal processing circuit means is to make a signal processing of producing a video signal which can be color-displayed by said displaying means for the signal output out of said imaging means under a white color illumination.

32. A system according to claim 31 wherein said signal processing circuit means has a first low-pass filter means cutting off input unnecessary higher harmonics, a color separating circuit arranged on the rear step side of said low-pass filter and outputting a color-separated color signal and a second low-pass filter means arranged on the read end side of said color-separating circuit.

33. A system according to claim 32 wherein said signal processing circuit means further has a resetting noise removing double sampling circuit provided on the front step side of said first low-pass filter means and a horizontal/vertical outline enhancing circuit provided on the rear step side of said second low-pass filter means.

34. A system according to any of claims 1, 6, 9, 10 or 11 wherein, even in case the number of pixels is different, said driving signal generating means will set the same the frequency of the horizontal transfer clock of said driving signal.

36. A system according to any of claims 1, 5, 6 or 7 wherein said illuminating light output means is formed of a light emitting diode arranged in the tip part of the insertable part of said electroscope.

37. A system according to claim 36 wherein said signal processing means will hold the same circuit constant even in case said number of pixels is different.

38. A system according to any of claims 1, 5, 6 or 7 wherein said illuminating light output means is formed of a lamp arranged in the top part of the insertable part of said electronscope.

39. A system according to any of claims 1, 6, 7, 9, 10 or 11 wherein said controlling signal varies the frequency of the horizontal transfer clock of the driving signal by said driving signal generating means in response to said number of pixels.

5. A video endoscope system comprising:

an electronic scope comprising

an elongated insertable part,

an illuminating light output means outputting an illuminating light out of the tip side of said insertable part,

an imaging means formed of a solid state imaging device and having a function of imaging an object illuminated by said illuminating light output means,

a signal transmitting cable connected with said solid state imaging device and

a signal connector fitted to the end part of said signal transmitting cable;

a driving signal generating means applying a driving signal to said solid state imaging device by connecting said signal connector;

a signal processing circuit means processing a signal read out of said solid state imaging device by the application of said driving signal;

a displaying means displaying the video image of the object by a video signal output out of said signal processing circuit means;

an information signal generating means provided in said electronic scope and generating an information signal relating to the general spectral characteristics of said electronic scope;

a controlling signal generating means sensing said information signal and generating a controlling signal for the adjustment of white balance; and

a white balance adjusting means forming said signal processing circuit and capable of varying the white balance adjusting amount by the application of said controlling signal.

6. A video endoscope system comprising:

an electronic scope comprising

an elongated insertable part,

an illuminating light output means outputting an illuminating light out of the tip side of said insertable part,

an imaging means formed of a solid state imaging device and having a function of imaging an object illuminated by said illuminating light output means,

a signal transmitting cable connected with said solid state imaging device and

a signal connector fitted to the end part of said signal transmitting cable;

a driving signal generating means applying a driving signal to said solid state imaging device by connecting said signal connector;

a signal processing circuit means processing a signal read out of said solid state imaging device by the application of said driving signal;

a displaying means displaying the video image of the object by a video signal output out of said signal processing circuit;

a pixel-number automatically detecting circuit provided within said signal processing circuit means and detecting the number of pixels of said solid state imaging device from a signal read out of said solid state imaging device by the application of said driving signal; and

a processing means corresponding to a controlling signal output by said automatic pixel-number detecting circuit.

8. A system according to claim 6 or 7 wherein said processing means is formed of a signal processing character varying means provided within said signal processing circuit means and varing the signal processing characteristic to corresponding to the number of pixels.

7. A video endoscope system comprising:

an electronic scope comprising

an elongated insertable part,

an illuminating light output means outputting an illuminating light out of the tip side of said insertable part,

an imaging means formed of a solid state imaging device and having a function of imaging an object illuminated by said illuminating light output means,

a signal transmitting cable connected with said solid state imaging device and

a signal connector fitted to the end part of said signal transmitting cable;

a driving signal generating means applying a driving signal to said solid state imaging device by connecting said signal connector;

a signal processing circuit means processing a signal read out of said solid state imaging device by the application of said driving signal;

a displaying means displaying the video image of the object by a video signal output out of said signal processing circuit means;

an information signal generating means provided in said electronic scope and generating an information signal relating to the number of pixels of said solid state imaging device built in said electronic scope;

a controlling signal generating means decoding said information signal and generating a controlling signal corresponding to the number of pixels; and

a processing means corresponding to the number of pixels by the application of said controlling signal.

9. An endoscope system comprising:

an optical endoscope comprising

an elongated insertable part,

a light guide means inserted through said insertable part and transmitting an illuminating light,

an observing optical system comprising an objective inserted through said insertable part and forming the image of an object illuminated by the light emitted from the emitting end surface of said light guide, an image guide having its entrance end surface arranged in the focal plane of said objective and transmitting the image of the object to the exit end surface and an eyepiece arranged as opposed to the exit end surface of said image guide and contained in the eyepiece part and

a light source connector formed on the entrance end surface of said light guide means;

an illuminating light generating means connected with said light source connector and feeding an illuminating light;

a television camera fitted to said eyepiece part of said optical endoscope and forming an imaging means of a solid state imaging device;

a signal transmitting cable connected with the solid state imaging device within said television camera;

a signal connector fitted to the end part of said signal transmitting cable;

a signal processing circuit means connectable with said signal connector, applying a driving signal to said solid state imaging device and processing the output signal of the solid state imaging device;

a displaying means displaying the video image of the object by the video signal output out of said signal processing circuit means;

an information signal generating means generating an information signal relating to the general spectral characteristic of said optical endoscope and/or television camera;

a white balance controlling signal generating means sensing said information signal and producing a controlling signal for the white balance adjustment; and

a white balance adjusting circuit means forming said signal processing circuit means and capable of varying the white balance adjusting amount by the application of said controlling signal.

10. An endoscope system comprising:

an optical endoscope comprising

an elongated insertable part,

a light guide means inserted through said insertable part and transmitting an illuminating light,

an observing optical system comprising an objective inserted through said insertable part and forming the image of an object illuminated by the light emitted from the emitting end surface of said light guide, an image guide having its entrance end surface arranged in the focal plane of said objective and transmitting the image of the object to the exit end surface and an eyepiece arranged as opposed to the exit end surface of said image guide and contained in the eyepiece part and

a light source connector formed on the entrance end surface of said light guide means;

an illuminating light generating means connected with said light source connector and feeding an illuminating light;

a television camera fitted to said eyepiece part of said optical endoscope and forming an imaging means of a solid state imaging device;

a signal transmitting cable connected with the solid state imaging device within said television camera;

a signal connector fitted to the end part of said signal transmitting cable;

a driving signal generating means connectable with said signal connector and applying a driving signal to the solid state imaging device;

a signal processing circuit means processing the signal read out of said solid state imaging device by the application of said driving signal;

a displaying means displaying the video image of the object by the video signal output out of said signal processing circuit means;

an information signal generating means built in said television camera and generating an information signal relating to the number of pixels of said solid state imaging device;

a controlling signal generating means decoding said information relating to the number of pixels and producing a different controlling signal in response to the number of pixels; and

a signal processing characteristic varying means varying the signal processing characteristic of said signal processing circuit means by the application of said controlling signal.

12. A system according to any of claims 9, 10 or 11 wherein said television camera is of a built-in color filter type.

13. A system according to any of claims 9, 10 or 11 wherein said television camera is of a frame sequential imaging system having no built-in color filter.

18. A system according to any of claims 6, 7, 9 or 10 wherein said information signal generating means is formed integrally with said signal connector.

19. A system according to claim 18 wherein said information signal generating means is formed of an adapter which can be fitted to said signal connector.

20. A system according to claim 18 wherein said information signal generating means is provided within said signal connector.

21. A system according to any of claims 9 or 10 wherein said information signal generating means generates an information signal of 1 bit with each contact pin.

22. A system according to claim 21 wherein said controlling signal generating means is formed of a comparator discriminating whether the bit signal of said contact pin is on the defined level or not.

23. A video endoscope system according to any of claims 9 or 10 wherein said information signal generating means is formed of a resistance connected between contact pins.

24. A system according to claim 23 wherein said controlling signal generating means comprises a constant current circuit flowing a constant current to a connected resistance and an A/D converter converting the voltage at both ends of the resistance through which said constant current is flowed to a digital amount.

25. A system according to any of claims 9 or 10 wherein said information signal generating means is formed of read-only memories.

11. An endoscope system comprising:

an optical endoscope comprising

an elongated insertable part,

a light guide means inserted through said insertable part and transmitting an illuminating light,

an observing optical system comprising an objective inserted through said insertable part and forming the image of an object illuminated by the light emitted from the emitting end surface of said light guide, an image guide having its entrance end surface arranged in the focal plane of said objective and transmitting the image of the object to the exit end surface and an eyepiece arranged as opposed to the exit end surface of said image guide and contained in the eyepiece part and

a light source connector formed on the entrance end surface of said light guide means;

an illuminating light generating means connected with said light source connector and feeding an illuminating light;

a television camera fitted to said eyepiece part of said optical endoscope and forming an imaging means of a solid state imaging device;

a signal transmitting cable connected with the solid state imaging device within said television camera;

a signal connector fitted to the end part of said signal transmitting cable;

a driving signal generating means connectable with said signal connector and applying a driving signal to the solid state imaging device;

a signal processing circuit means processing the signal read out of said solid state imaging device by the application of said driving signal;

a displaying means displaying the video image of the object by the video signal output out of said signal processing circuit means;

a automatic pixel-number detecting circuit provided within said signal processing circuit means and detecting the number of pixels of said solid state imaging device from the signal read out of said solid state imaging device by the application of said driving signal.

14. A system according to claim 6 or 11 wherein said automatic pixel number detecting circuit has a comparator means which comparates an input signal read out from said solid state imaging device by application of said driving signal with a definite level, and a counter means which counts a clock in a period said comparator means descriminates said input signal larger than said definite level.

15. A system according to claim 14 wherein said automatic pixel number detecting circuit has second comparator means which comparates an output number of said counter means with a definite number corresponding to some number of pixels.

16. A system according to claim 15 wherein said second comparator means is formed of a digital comparator.

17. A system according to claim 6 or 11 wherein said automatic pixel number detecting circuit detects two numbers of pixels along a horizontal direction and a vertical direction.

35. A system according to any of claims 6 or 11 wherein said exposure time controlling means changes a plurality of rotary wheels fitted respectively with a plurality of color transmitting filters to vary the illuminating time through the respective color transmitting filters.

40. A video endoscope system comprising:

a plurality of electronic scopes forming imaging means of solid state imaging devices different in the number of picture elements;

a signal cable connected to said solid state imaging device of said electronic scope;

a connector fitted to the end part of said signal cable;

a signal processing circuit means connected to a connector receiver connectable with said connector and processing the signal to output a video signal;

a monitor means displaying the video signal output from said signal processing means; and

a driving circuit applying the same driving signal even in case the number of pixels of said solid state imaging device is different.