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Noise reduction system, endoscope processor, and endoscope system

A noise reduction, electronic endoscope technology, applied in the direction of endoscopes, TV system components, instruments, etc.

Inactive Publication Date: 2009-06-10
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, noise is a prominent problem when acquiring images using bulk exposure in CMOS imaging devices

Method used

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  • Noise reduction system, endoscope processor, and endoscope system
  • Noise reduction system, endoscope processor, and endoscope system
  • Noise reduction system, endoscope processor, and endoscope system

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Experimental program
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Embodiment Construction

[0021] The present invention will be described below with reference to the embodiments shown in the drawings.

[0022] In FIG. 1 , an endoscope system 10 includes an endoscope processor 20 , an electronic endoscope 30 and a monitor 11 . The endoscope processor 20 is connected to an electronic endoscope 30 and a monitor 11 .

[0023] Endoscope processor 20 emits illumination light to illuminate a desired target. The illuminated object is photographed and / or videotaped by the electronic endoscope 30, after which the electronic endoscope 30 generates an image signal. The image signal is sent to the endoscope processor 20 .

[0024] The endoscope processor 20 performs predetermined signal processing on the received image signal. The image signal subjected to predetermined signal processing is sent to the monitor 11 where an image corresponding to the received image signal is displayed.

[0025] Endoscope processor 20 includes light source unit 40, image signal processing unit ...

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PUM

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Abstract

The invention provides a noise reduction system, an endoscope processor and an endoscope system. The noise reduction system comprising a switch, a light-source controller, a memory and a noise reduction block, is provided. The switch switches an exposure method of a CMOS imaging device to global exposure. The CMOS imaging device generates an image signal on the basis of signal charges. The light-source controller orders illumination of the subject to be suspended during a receiving period in at least one field period after switching the exposure method to the global exposure. The signal charges are generated during the receiving period. The memory stores the image signal which is based on the signal charges generated during the suspension period as a black image signal. The noise reduction block removes fixed pattern noise from an optical image signal on the basis of the black image signal stored in the memory.

Description

technical field [0001] The present invention relates to a noise reduction system that reduces the influence of fixed pattern noise that appears in an image acquired using spherical exposure in a CMOS imaging device mounted in an electronic endoscope. Background technique [0002] Electronic endoscopes are known which have an imaging device at the head end of an insertion tube. By sending the illumination light emitted by the light source to the head end of the insertion tube through the optical fiber, it is possible to take pictures and / or videos of objects in a dark environment, such as inside a body or an institution. [0003] Images with special visual effects can be displayed by means of special lighting on the target. For example, in known techniques the target is illuminated by pulsed light generated by pulsed emissions. By photographing the vocal cords illuminated by pulsed light whose frequency is adjusted to be almost the same as the vibration frequency of the voc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B1/04A61B1/00A61B1/06G02B23/24G02B23/26H04N25/00
CPCH04N5/2354H04N5/361H04N5/374A61B1/045A61B1/07A61B1/00009A61B1/0669H04N5/353H04N2005/2255H04N5/365A61B1/000095H04N23/555H04N23/74H04N25/76H04N25/63H04N25/67H04N25/53
Inventor 谷信博入山典子
Owner HOYA CORP