Image processing apparatus and control method thereof

A control method of an image processing apparatus which generates HDR (High Dynamic Range) image data from a plurality of image data different in exposure amount, the method comprising:

• generating first HDR image data by applying first gamma to each of the plurality of image data and composing the plurality of image data after application of the first gamma;
• discriminating, based on a light region which satisfies a preset condition, the light region, a dark region, and an intermediate region from one preset image data out of the plurality of image data if the one preset image data includes the light region;
• and
• generating second HDR image data by applying second gamma different from the first gamma to one of the plurality of image data, and composing, in accordance with a result by the discriminating, image data obtained by applying the second gamma and the first HDR image data.

An image processing apparatus which generates HDR (High Dynamic Range) image data from a plurality of image data different in exposure amount, the apparatus comprising:

• a first composition unit configured to generate first HDR image data by applying first gamma to each of the plurality of image data and composing the plurality of image data after application of the first gamma in accordance with a preset relationship;
• a determination unit configured to determine whether one preset image data out of the plurality of image data includes a light region which satisfies a preset condition;
• a generation unit configured to generate, based on the light region which satisfies the condition, map data for discriminating the light region, a dark region, and an intermediate region from the one preset image data if the determination unit determines that the one preset image data includes the light region;
• a map data correction amount calculation unit configured to calculate a correction amount of the map data from a determination result by the determination unit and a determination result by the determination unit of a preceding frame;
• and
• a second composition unit configured to generate second HDR image data by applying second gamma different from the first gamma to one of the plurality of image data, and composing, with reference to map data corrected with the correction amount calculated by the map data correction amount calculation unit, image data obtained by applying the second gamma and the HDR image data.

A control method of an image processing apparatus which generates HDR (High Dynamic Range) image data from a plurality of image data different in exposure amount, the method comprising:

• generating first HDR image data by applying first gamma to each of the plurality of image data and composing the plurality of image data after application of the first gamma in accordance with a preset relationship;
• determining whether one preset image data out of the plurality of image data includes a light region which satisfies a preset condition;
• generating, based on the light region which satisfies the condition, map data for discriminating the light region, a dark region, and an intermediate region from the one preset image data if it is determined that the one preset image data includes the light region;
• calculating a correction amount of the map data from a determination result by the determining and a determination result by the determining of a preceding frame;
• and
• generating second HDR image data by applying second gamma different from the first gamma to one of the plurality of image data, and composing, with reference to map data corrected with the calculated correction amount, image data obtained by applying the second gamma and the HDR image data.

A non-transitory computer readable storage medium storing a computer program which causes, when read and executed by a computer, the computer to execute steps of a method which generates HDR (High Dynamic Range) image data from a plurality of image data different in exposure amount, the method comprising:

• generating first HDR image data by applying first gamma to each of the plurality of image data and composing the plurality of image data after application of the first gamma in accordance with a preset relationship;
• discriminating, based on a light region which satisfies a preset condition, the light region, a dark region, and an intermediate region from one preset image data out of the plurality of image data if the one preset image data includes the light region;
• and
• generating second HDR image data by applying second gamma different from the first gamma to one of the plurality of image data, and composing, in accordance with a result of the discriminating, image data obtained by applying the second gamma and the first HDR image data.

A non-transitory computer readable storage medium storing a computer program which causes, when read and executed by a computer, the computer to execute steps of a method which generates HDR (High Dynamic Range) image data from a plurality of image data different in exposure amount, the method comprising:

• generating first HDR image data by applying first gamma to each of the plurality of image data and composing the plurality of image data after application of the first gamma in accordance with a preset relationship;
• determining whether one preset image data out of the plurality of image data includes a light region which satisfies a preset condition;
• generating, based on the light region which satisfies the condition, map data for discriminating the light region, a dark region, and an intermediate region from the one preset image data if it is determined that the one preset image data includes the light region;
• calculating a correction amount of the map data from a determination result by the determining and a determination result by the determining of a preceding frame;
• and
• generating second HDR image data by applying second gamma different from the first gamma to one of the plurality of image data, and composing, with reference to map data corrected with the calculated correction amount, image data obtained by applying the second gamma and the first HDR image data.