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Clamp level adjusting apparatus, electronic camera, image processing apparatus

A technology for clamping level and adjusting equipment, applied in image communication, TV, electrical components, etc., can solve the problem of insufficiently satisfying fine brightness adjustment

Active Publication Date: 2005-11-09
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the traditional technology is not enough to meet the needs of users to finely adjust the brightness of the image data on the computer

Method used

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  • Clamp level adjusting apparatus, electronic camera, image processing apparatus
  • Clamp level adjusting apparatus, electronic camera, image processing apparatus
  • Clamp level adjusting apparatus, electronic camera, image processing apparatus

Examples

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Embodiment Construction

[0063] The present invention will be described in detail below based on embodiments with reference to the accompanying drawings.

[0064] [Explanation of the structure of the first embodiment]

[0065] FIG. 1 is a block diagram showing a clamp level adjusting device according to a first embodiment. The clamp level adjusting device of the first embodiment is included in an electronic camera including an image pickup device 1, a clamp section 2, an A / D conversion section 3, a signal output switching section 4, and a clamp level calculation section. 5, a D / A conversion section 6, a first selector section 7 functioning as an output section, and a CPU 8.

[0066] Such as figure 2 As shown, the light-receiving surface of the image pickup device 1 has light-receiving elements (photodiodes) arranged in rows and columns for photoelectric conversion, each forming a pixel. A vertical reading line (not shown) is also provided in each column of light receiving elements. These vertical ...

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PUM

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Abstract

A clamp level adjusting apparatus of the invention includes: an image pickup device which has an effective pixel area for producing an image signal and a lightproof area formed around the effective pixel area to produce a black level standard signal; a clamp level calculating section for extracting the black level standard signal from an extracting range of a plurality of horizontal rows in the lightproof area and for producing a clamp level value corresponding to each horizontal row in the effective pixel area based on a vertical moving average value of black level standard signals in the extracting range; and a clamp section for correcting a black level of the image signal based on the clamp level value.

Description

technical field [0001] The present invention relates to a clamp level adjustment circuit for performing black level correction on an output from an image pickup device in an electronic camera or the like. The present invention also relates to an image processing device and an image processing program for processing a shot image captured by an electronic camera. Background technique [0002] It is conventionally known that the output of an image pickup device of an electronic camera contains black level noise, which originates from a dark current component in a light receiving element. A method of correcting such black levels is known to those skilled in the art. The method includes the steps of detecting a black level of a light-shielded area or portion of an image pickup device that is shaded from ambient light, and then subtracting the black level from an image level of an effective pixel area that is not shaded. [0003] The black level correction device disclosed in Ja...

Claims

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Application Information

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IPC IPC(8): H04N5/243H04N5/16H04N5/335H04N5/367H04N5/369H04N5/378H04N101/00
Inventor 森下昭彦
Owner NIKON CORP
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