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Imaging apparatus and method for controlling diaphragm

A technology of camera equipment and aperture, which is applied in the fields of aperture, optics, image communication, etc., and can solve the problems of image signal-to-noise ratio reduction, increase of gain value, etc.

Active Publication Date: 2013-05-15
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if you increase the gain value, the signal-to-noise ratio (S / N) of the image will decrease
In particular, if the scene is a scene in which the amount of incident light is small (for example, an indoor scene), the increase amount of the gain value increases, and the increase in the gain value due to the increased Image quality degradation has a greater impact on the image

Method used

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  • Imaging apparatus and method for controlling diaphragm
  • Imaging apparatus and method for controlling diaphragm
  • Imaging apparatus and method for controlling diaphragm

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Embodiment Construction

[0018] Several exemplary embodiments, features, and aspects of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] A first exemplary embodiment of the present invention will be described. figure 1 is a block diagram showing an example of a schematic configuration of the imaging apparatus 100 according to an exemplary embodiment of the present invention. The imaging apparatus 100 is an imaging apparatus such as a digital still camera or a digital camcorder, and is also an interchangeable lens type imaging apparatus having a lens unit removably mounted on the lens mount 26 of the camera body. The imaging apparatus 100 receives a light beam incident on the image sensor 13 via the lens 1 , and generates a captured image according to instructions supplied from the microcomputer 18 to a plurality of circuits.

[0020] The lens 1 guides light beams incident on the imaging apparatus 100 from the outside to the inside of the i...

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Abstract

An imaging apparatus includes an imaging unit, a first information acquisition unit configured to acquire information on a focal length of a lens unit configured to guide light to the imaging unit, a second information acquisition unit configured to acquire information on an amount of light incident on the imaging unit, and a control unit configured to control a diaphragm configured to adjust the amount of light incident on the imaging unit, wherein the control unit is configured to determine a maximum opening value, which is used for diaphragm control of the diaphragm, based on the information on the focal length acquired by the first information acquisition unit and the information on the amount of incident light acquired by the second information acquisition unit.

Description

technical field [0001] The present invention relates to an imaging apparatus capable of photographing a subject through a lens unit having an optical zoom function. Background technique [0002] In recent years, there has been a strong demand for smaller and lighter imaging devices such as digital still cameras and digital camcorders using high-magnification lenses. In this case, it is considered that the numerical value of the specification related to the optical zoom magnification of the lens unit is very important. [0003] However, if the lens unit is reduced in size and its magnification is increased, image quality tends to deteriorate due to, for example, chromatic aberration of the lens especially on the longer focal length side (ie, telephoto side) of the optical zoom. For example, flare is known to occur due to reflection of light incident on a lens. In the event of flare, the level of black areas in the image rises (detuned black level), and the contrast of the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/238G03B9/02
CPCH04N5/23212H04N23/959H04N25/61
Inventor 前田宗克
Owner CANON KK