JP2006319901A5

JP2006319901A5 -

Info

Publication number: JP2006319901A5
Application number: JP2005143003A
Authority: JP
Filing date: 2005-05-16
Publication date: 2008-06-19
Anticipated expiration: 2025-05-16

Claims

A metering unit for metering the object scene;
An imaging unit that determines an exposure amount based on a photometric value obtained by the photometric unit, images the object scene, and generates an image;
Of the image generated by the imaging unit, a ratio between an image output value of a portion corresponding to a predetermined region of the object scene and a target image output value of the predetermined region, and the exposure detected by the photometric unit A calculation unit that calculates a correction value to be used when correcting the image based on a difference between the photometric value for which the amount is determined and the maximum luminance value of the predetermined area;
An electronic camera comprising: a correction unit that corrects the image based on the correction value calculated by the calculation unit.

The electronic camera according to claim 1,
The calculation unit calculates the correction value so that the degree of correction by the correction unit decreases as the difference between the photometric value for determining the exposure amount and the maximum luminance value increases. .

  The electronic camera according to claim 1 or 2,
  The calculation unit sets the correction contribution rate to a constant value when the difference between the photometric value for determining the exposure amount and the maximum luminance value is less than a predetermined value, and sets the photometric value for determining the exposure amount and the maximum luminance. When the difference from the value is equal to or greater than the predetermined value, the correction value is calculated so that the correction contribution ratio is decreased as the difference is larger.
  An electronic camera characterized by that.

  The electronic camera according to any one of claims 1 to 3,
  The arithmetic unit uses an average luminance output of image data of a portion corresponding to the predetermined area of the object scene as an image output value of the portion corresponding to the predetermined area of the object scene.
  An electronic camera characterized by that.

  In the electronic camera of any one of Claims 1-4,
  The metering unit outputs the brightness of the corrected reference area,
  The calculation unit uses an average luminance output of image data of a portion corresponding to the corrected reference area as a target image output value of the predetermined area.
  An electronic camera characterized by that.

  In the electronic camera of any one of Claims 1-5,
  The metering unit can set a plurality of metering modes, and changes the metering area of the object scene according to the set metering mode.
  An electronic camera characterized by that.

  Along with the image to be processed, the acquisition procedure for acquiring the partial area information of the image, and the photometric value of the object scene when the image is captured,
  A ratio between an image output value of the partial area and a target image output value of the partial area of the image to be processed; and a photometric value for determining an exposure amount at the time of capturing the image among the photometric values; A calculation procedure for calculating a correction value to be used when correcting the image based on a difference from a maximum luminance value of a portion corresponding to the partial region;
  A correction procedure for correcting the image to be processed based on the correction value calculated by the calculation means;
  An image processing program for causing a computer to execute.

  The image processing program according to claim 7,
  In the calculation procedure, the correction value is calculated so that the degree of correction decreases as the difference between the photometric value for determining the exposure amount and the maximum luminance value increases.
  An image processing program characterized by that.

  In the image processing program according to claim 7 or 8,
  In the calculation procedure, when the difference between the photometric value for determining the exposure amount and the maximum luminance value is less than a predetermined value, the correction contribution rate is set to a constant value, and the photometric value for determining the exposure amount is determined. When the difference between the value and the maximum luminance value is equal to or greater than a predetermined value, the correction value is calculated so that the correction contribution ratio is decreased as the difference is larger.
  An image processing program characterized by that.

  The image processing program according to any one of claims 7 to 9,
  In the calculation procedure, the average luminance output of the image data of the partial area is used as the image output value of the partial area.
  An image processing program characterized by that.

  In the image processing program of any one of Claims 7-10,
  In the acquisition procedure, the luminance of the correction reference area is acquired,
  In the calculation procedure, the average luminance output of the image data of the portion corresponding to the corrected reference region is used as the target image output value of the partial region.
  An image processing program characterized by that.