Image processing device and method to calculate luminosity of an environmental light of an image

An image processing method, comprising:

• in an image processing device:
• receiving a user input at a second position in a first image that is being displayed;
• calculating a luminosity of environmental light for each region of a plurality of regions of the first image of an object based on:
• an overall average value of luminosity of a plurality of pixels of the first image of the object, and region average values,
• wherein the region average values are average values of luminosity of pixels, of the plurality of pixels, for each region of the plurality of regions;
• determining a gain for multiplication with the calculated luminosity of the environmental light for each region of the plurality of regions of the first image;
• and
• generating a second image of the object in which the object is illuminated with light from a first position in the second image based on the user input at the second position in the first image,
• wherein the first position in the second image corresponds to the second position in the first image, and
• wherein the second image is generated based on the multiplication of the gain with the calculated luminosity of the environmental light for each region of the plurality of regions of the first image;
• and
• wherein the second image is to be displayed in response to the user input.

A non-transitory computer-readable medium, having stored thereon, computer-executable instructions, which when executed by an image processing device, cause the image processing device to execute operations, the operations comprising:

• displaying a first image;
• receiving a user input at a second position in the first image;
• calculating a luminosity of environmental light for each region of a plurality of regions of the first image of an object based on:
• an overall average value of luminosity of a plurality of pixels of the first image of the object, and region average values,
• wherein the region average values are average values of luminosity of pixels, of the plurality of pixels, for each region of the plurality of regions;
• determining a gain for multiplication with the calculated luminosity of the environmental light for each region of the plurality of regions of the first image;
• and
• generating a second image of the object in which the object is illuminated with light from a first position in the second image based on the user input at the second position in the first image,
• wherein the first position in the second image corresponds to the second position in the first image, and
• wherein the second image is generated based on the multiplication of the gain with the calculated luminosity of the environmental light for each region of the plurality of regions of the first image;
• and
• displaying the second image.

An image processing device, comprising:

• circuitry configured to:
• display a first image;
• receive a user input at a second position in the first image;
• calculate a luminosity of environmental light for each region of a plurality of regions of the first image of an object based on:
• an overall average value of luminosity of a plurality of pixels of the first image of the object, and a plurality of region average values,
• wherein the plurality of region average values are average values of luminosity of pixels, of the plurality of pixels, for each region of the plurality of regions;
• determine a gain for multiplication with the calculated luminosity of the environmental light for each region of the plurality of regions of the first image;
• generate a second image of the object in which the object is illuminated with light from a first position in the second image based on the user input at the second position in the first image,
• wherein the calculated luminosity of the environmental light for the plurality of regions is based on the second position and the plurality of region average values, and
• wherein the first position in the second image corresponds to the second position in the first image;
• and
• predict, based on the multiplication of the gain with the luminosity of the environmental light for each region of the plurality of regions of the first image, a second difference between luminosity of the environmental light of the second image and the luminosity of the environmental light for each region of the plurality of regions of the first image, wherein the second image is generated based on the second difference;
• and
• display the second image.