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Image processing apparatus and control method thereof

a technology of image processing and control method, applied in the field of image processing apparatus, can solve the problems of difficult to achieve accurate exposure adjustment and loss of highlights, and achieve the effect of accurate exposure adjustmen

Active Publication Date: 2016-02-23
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention solves the issue of a difference in color levels between a recorded image and a display image. The invention allows the user to confirm which parts of the image have insufficient light levels and make accurate exposure adjustments. This results in a better display of the image.

Problems solved by technology

For this reason, an image signal of a latitude not less than that restricted by the display gamma characteristic causes a highlight-detail loss, and accurate exposure adjustment is difficult to attain upon confirmation of a captured image.

Method used

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  • Image processing apparatus and control method thereof
  • Image processing apparatus and control method thereof
  • Image processing apparatus and control method thereof

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first embodiment

[0022]An embodiment in which an image processing apparatus of the present invention is applied to an image capturing apparatus such as a digital video camera for shooting a still image and moving image will be described hereinafter.

[0023]

[0024]The configuration and functions of an image capturing apparatus according to an embodiment of the present invention will be described below with reference to FIG. 1.

[0025]Referring to FIG. 1, a shooting lens set 100 condenses an optical image of an object, and forms it on an image capturing surface of an image sensor 102 serving as an image input unit. An aperture diaphragm 101 adjusts an incoming light amount of the optical image of the object. The image sensor 102 is an image capturing element such as a CCD or CMOS. The image sensor 102 photoelectrically converts an object image formed by the shooting lens set 100 to generate an analog signal, and further converts the analog signal into a digital signal to be output. R (red), G (green), and ...

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Abstract

An image processing apparatus comprises a recording image generation unit which generates recording image data from image data input by an image input unit, based on a first gamma characteristic; a display image generation unit which generates display image data from the image data based on a second gamma characteristic in correspondence with a characteristic of a display unit; a determination unit which determines whether or not the recording image data includes a portion of luminance levels which are not less than a predetermined threshold; a display data generation unit which generates display data for indicating the portion of the luminance levels which are not less than the predetermined threshold; and a display control unit which superimposes the display data on the display image data.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an image processing apparatus which has a portion of luminance levels at which tones cannot be expressed on a display unit due to a latitude difference between a recording image and display image, and a control method thereof.[0003]2. Description of the Related Art[0004]Digital camera parameters include “latitude” as one important item. “Latitude” is a reproducible exposure range or tolerance level of an object, and is determined by settings of an exposure value using an aperture diaphragm and a gamma characteristic as in a dynamic range. A characteristic which can reproduce an image even by setting an exposure value that normally causes highlight-detail loss or shadow-detail loss is expressed as “wide latitude”. In case of such characteristic, smooth tones can be reproduced from a dark part to a bright part. Conversely, a characteristic with a narrow reproducible exposure range is expre...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G09G5/14H04N5/44H04N5/232H04N9/64H04N1/60H04N5/202G06T11/00G06T5/40G06T5/00G09G5/10G09G5/02
CPCH04N5/23293H04N1/6027H04N5/23229H04N23/80H04N23/63
Inventor ITO, YASUSHI
Owner CANON KK