Electronic device and method for controlling the same

A method for controlling an electronic device having an image sensor, the method comprising:

• generating a first image based on an electric signal generated by the image sensor;
• calculating a first contrast value for the first image;
• storing a plurality of brightness values, wherein each brightness value is a value of a brightest point within a first area centered at a first point in the first image as a brightness value of the first point and generating a second image based on the plurality of stored brightness values;
• and
• determining a weighted value for each point based on the brightness value of each point included in the second image and calculating a second contrast value based on the determined weighted value of each point and the first contrast value.

A non-transitory storage medium comprising a program for controlling an electronic device having an image sensor, the program comprising program code that, when executed by at least one processor of the electronic device, causes the electronic device to:

• generate a first image based on an electric signal generated by the image sensor;
• calculate a first contrast value for the first image;
• store a plurality of brightness values, wherein each brightness value is the brightest point within a first area centered at a first point in the first image, as a brightness value of the first point and generating a second image based on the plurality of the stored brightness values;
• and
• determine a weighted value for each point according to the brightness value of each point included in the second image and calculating a second contrast value by using the determined weighted value of each point and the first contrast value.

An electronic device comprising:

• an image sensor including a plurality of pixel arrays;
• and
• a processor connected to the image sensor electrically;
• wherein the processor is configured to generate a first image based on an electric signal generated by the image sensor, calculate a first contrast value for the first image, select at least one point included in the first image, select an area including points located in a predetermined distance from the center of the at least one point, store a brightness value of the brightest point in the area as a representative brightness value of the area by matching with the area, generate a second image based on the stored representative brightness values, determine a weighted value for each point of the at least one point based on to the brightness value of each point included in the second image, and calculate a second contrast value by using the determined weighted value and the first contrast value.