Color correction device for an endoscope

• US 5,111,281 A
• Filed: 10/03/1990
• Issued: 05/05/1992
• Est. Priority Date: 09/28/1987
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Sekiguchi, Tadashi
• Primary Examiner(s): Chin, Tommy P.
• Application Number:
  US07/593,323
• Time in Patent Office: 580 Days
• Field of Search: 358/21 R, 358/27, 358/29, 358/29 C, 358/28, 358/10, 358/80, 358/98, 128/6
• US Class Current: 348/65
• 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
• CPC Class Codes: H04N 23/86 for controlling the colour saturation of colour signals, e.g. automatic chroma control circuits
• CPC Class Codes: H04N 23/88 for colour balance, e.g. white-balance circuits or colour temperature control
• CPC Class Codes: H04N 9/68 for controlling the amplitude of colour signals, e.g. automatic chroma control circuits H04N9/71, H04N9/73 take precedence; camera processing pipelines for controlling the colour saturation of colour signals H04N23/86

Abstract

A color correction device for an endoscope capable of performing color corrections in accordance with chromatic characteristics such as saturation and/or hue of image signals is disclosed. The device includes an unit that selects appropriate color corrections to be made in accordance with chromatic characteristics of image signals, and an unit that performs the selected color corrections. An endoscope incorporating such a device is also disclosed.

Claims

1. A color correction device for an endoscope, comprising:

means for specifying an appropriate color correction for image signals to be made in accordance with certain chromatic characteristics of said image signals; and

means for performing the color correction specified by the specifying means, including;

calculation means receiving said image signals for carrying out calculations for the color correction; and

memory means for storing sets of color correction factors to be used in the calculation of the color correction and for providing an appropriate set of the color correction factors to the calculation means, the appropriate set of the color correction factors being selected according to addresses of the memory means specified by the specifying means according to said certain chromatic characteristics of said image signals.

2. The device of claim 1, wherein the performing means includes memory means which store formulae for calculations of the color correction, and wherein the specifying means selects addresses of the memory means corresponding to the appropriate color correction formulae.

3. The device of claim 1, wherein the chromatic characteristics include saturation.

4. The device of claim 1, wherein the chromatic characteristics include hue.

5. The device of claim 1, wherein the chromatic characteristics include saturation and hue.

6. The device of claim 1, further comprising means for converting the image signals in the form of RGB signals into image signals in the form of NTSC signals.

7. The device of claim 1, wherein the performing means further includes arithmetic logic means which calculates continuously variable color correction factors from at least two sets of the color correction factors stored in the memory means.

8. An endoscope comprising:

a scope including imaging device means for picking up light signals form an object to be imaged;

camera control unit means for extracting image signals from output signals of the imaging device means; and

a color correction device, including means for specifying an appropriate color correction for said image signals to be made in accordance with certain chromatic characteristics of said image signals extracted by the camera control unit means, and means for performing the color correction specified by the specifying means;

said performing means further including;

calculation means receiving said image signals for carrying out calculations for the color correction; and

memory means for storing sets of color correction factors to be used in the calculation for the color correction and for providing an appropriate set of the color correction factors to the calculation means, the appropriate set of the color correction factors being selected according to addresses of the memory means specified by the specifying means according to said certain chromatic characteristics of said image signals.

9. The endoscope of claim 8, wherein the performing means includes memory means which store formulae for calculations of the color correction, and wherein the specifying means selects addresses of the memory means corresponding to the appropriate color correction formulae.

10. The endoscope of claim 8, wherein the chromatic characteristics include saturation.

11. The endoscope of claim 8, wherein the chromatic characteristics include hue.

12. The endoscope of claim 8, wherein the chromatic characteristics include saturation and hue.

13. The endoscope of claim 8, further comprising means for converting the image signals in the form of NTSC signals into image signals in form of RGB signals.

14. The endoscope of claim 8, wherein the performing means further includes means for converting the image signals in the form of RGB signals into image signals in the form of NTSC signals.

15. The endoscope of claim 8, wherein the performing means further includes arithmetic logic means which calculates continuously variable color correction factors from a set of the color correction factors stored in the memory means.