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Camera

a technology of camera and storage type, applied in the field of camera, can solve the problem of undesirable flattening of the detection signal of such a storage type sensor

Inactive Publication Date: 2011-02-17
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach allows for accurate focus detection by adjusting the sensitivity of the range-finding sensor to match the luminance of the main subject, reducing the influence of background luminance and improving defocus amount calculation, while also simplifying the camera structure by separating sensors and optimizing image processing.

Problems solved by technology

Due to this, if the luminance of the main photographic subject is low, there is a fear that the detection signal from such a storage type sensor will be undesirably flattened.

Method used

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Examples

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embodiment # 1

Variant Embodiment #1

[0072]In the above explanation, an example was described in which, when dividing the image information from the area sensor 107 into two groups, the boundary for division was decided by deciding whether or not the change of hue was within a predetermined hue decision threshold value. Instead of this, it would also be acceptable to arrange to decide upon the boundary for division by deciding whether or not the change of luminance is within a predetermined luminance decision threshold value.

embodiment # 2

Variant Embodiment #2

[0073]Moreover, it would also be acceptable to arrange to decide upon the boundary for division by deciding upon both the hue and the luminance.

embodiment # 3

Variant Embodiment #3

[0074]In the above explanation, when deciding upon the boundary for division, it was arranged to compare together the hue or the luminance between the upper edge pixel and pixels from the upper edge towards the lower edge of the image information from the area sensor 107, thereof. However, instead of this, it would also be acceptable to arrange to make a comparison between the right edge pixel and pixels from the right edge towards the left edge of the image information from the area sensor 107, or between left edge pixel and pixels from the left edge towards the right edge of the image information from the area sensor 107.

[0075]It should be noted as mentioned above that it would also be acceptable to arrange to make a comparison between adjacent pixels from the area sensor 107 from the right edge of the image information towards the left edge thereof, or between adjacent pixels from the area sensor 107 from the left edge of the image information towards the rig...

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PUM

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Abstract

A camera includes: a first sensor of a storage type that has a plurality of pixels; a focus detection unit that detects a focus adjustment state of a photographic optical system based upon a detection signal from the first sensor for a photographic subject; a second sensor that acquires an image of the photographic subject; an extraction unit that extracts a main photographic subject region from image information acquired by the second sensor; and a control unit that controls accumulation of electrical charge by the first sensor, based upon values outputted from pixels of the first sensor that correspond to the main photographic subject region.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is a Continuation of application Ser. No. 12 / 216,867, filed Jul. 11, 2008, which claims priority of Japanese Patent Application No. 2007-192180, filed Jul. 24, 2007. The disclosure of the prior applications is hereby incorporated by reference herein in their entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a camera that performs focus detection.[0004]2. Description of Related Art[0005]A technique is known for detecting the defocus amount of a photographic optical system of a camera or the like based upon the detection signal from a storage-type sensor that has a plurality of pixels (refer to Japanese Laid-Open Patent Publication Heisei 5-249369).SUMMARY OF THE INVENTION[0006]When determining the accumulation time period of a storage type sensor in the prior art, an accumulation time period is determined that is suitable for the high luminance portion of the photographic field. ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03B13/32G02B7/28G02B7/34G03B13/36H04N25/00
CPCG02B7/28G02B7/285H04N5/2353H04N5/23212G03B13/34H04N23/672H04N23/73
Inventor HOSOI, KAZUMA
Owner NIKON CORP