Image processing method for improving image quality and image processing device therewith

An image processing device comprising:

• an image sensing circuit configured to receive light reflected from a same object under different light conditions to generate a first image signal and a second image signal;
• and
• an image processing logic configured to generate a final result image by,
• generating a first image and a second image based on the first image signal and the second image signal, respectively,
• adjusting a brightness of each of the first image and the second image based on a first exposure time when the first image is generated and a second exposure time when the second image is generated, respectively, the adjusted brightness of the first image corresponding to a brightness of the first image when the first image signal is received over a unit exposure time, the adjusted brightness of the second image corresponding to a brightness of the second image when the second image signal is received over the unit exposure time;
• estimating an intensity of light which reaches the object when the second image is generated based on the adjusted brightness of each of the first and second images,
• separating the second image into two or more regions according to the estimated intensity of light,
• determining a target brightness that the final result image is to have, and
• adjusting the brightness of the second image, by different amounts for each of the separated regions, based on the target brightness.

A method comprising:

• normalizing a first brightness of a first image of an object and a second brightness of a second image of the object captured under different light conditions,
• estimating an intensity of light reaching the object in the second image based on the normalized first brightness and the normalized second brightness,
• determining at least a first region and a second region in the second image based on the estimated intensity of light,
• adjusting at least one of a third brightness of the first region and a fourth brightness of the second region based on a target brightness of a final image, and
• generating the final image based on at least the adjusted third brightness and the adjusted fourth brightness.