Image processing apparatus, image capture apparatus, control method, and computer-readable storage medium
AssigneeCanon Kabushiki Kaisha
InventorNarumi Matsuoka
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Abstract
An image processing apparatus for generating an image to display on a display configured so that a setting for maximum display luminance can be changed, obtains an image signal and the setting, generates the image to display by executing image processing including tone conversion on the obtained image signal, and sets a tone characteristic used in tone conversion based on the setting. The tone characteristic is for allocating a signal value of the image signal to a luminance range according to the setting, and shows a relationship in which a logarithmic value of the signal value of the image signal and an absolute luminance are roughly identical in at least a portion of the luminance range, independent of the setting.
Claims14
An image processing apparatus for generating an image to display on a display unit configured so that a setting for maximum display luminance can be changed, comprising at least one processor and/or circuit configured to perform operations of the following units:
- a first obtaining unit configured to obtain an image signal;
- a second obtaining unit configured to obtain the setting for the maximum display luminance of the display unit;
- a generating unit configured to generate the image to display by executing image processing including tone conversion on the image signal obtained by the first obtaining unit;
- and
- a setting unit configured to set a tone characteristic used in tone conversion executed by the generating unit based on the setting for the maximum display luminance obtained by the second obtaining unit, wherein
- the tone characteristic is for allocating a signal value of the image signal to a luminance range according to the setting for the maximum display luminance;
- and
- the tone characteristic shows a relationship where a logarithmic value of the signal value of the image signal and an absolute luminance are in a roughly identical proportional constant linear relationship in at least a portion of the luminance range, independent of the setting for the maximum display luminance,
- wherein a breadth of the at least a portion of the luminance range is different depending on the setting for the maximum display luminance.
A control method for an image processing apparatus for generating an image to display on a display unit configured so that a setting for maximum display luminance can be changed, comprising:
- obtaining an image signal;
- obtaining the setting for the maximum display luminance of the display unit;
- generating the image to display by executing image processing including tone conversion on the obtained image signal;
- and
- setting a tone characteristic used in tone conversion executed in the generating on the basis of the setting for the obtained maximum display luminance, wherein
- the tone characteristic is for allocating a signal value of the image signal to a luminance range according to the setting for the maximum display luminance;
- and
- the tone characteristic shows a relationship where a logarithmic value of the signal value of the image signal and an absolute luminance are in a roughly identical proportional constant linear relationship in at least a portion of the luminance range, independent of the setting for the maximum display luminance,
- wherein a breadth of the at least a portion of the luminance range is different depending on the setting for the maximum display luminance.
Dependencies are inferred from the claim text.