Image processing system and image processing method

An image processing system, comprising:

• an image sensor configured to determine pixel values including phase information and brightness information of an image based on light received from outside;
• and
• an image processing device configured to obtain depth information of the image based on the pixel values received from the image sensor,
• wherein the image sensor includes microlenses, each of the microlenses corresponding to n square pixels, where n is an integer of two or more, and
• wherein the image processing device comprises:
• a data group generator configured to determine data groups based on target pixel values, which correspond to a range determined according to the phase information, among the pixel values;
• a gradient value manager configured to determine gradient values of a region corresponding to the target pixel values and determine gradient information by applying threshold values, which are determined according to the target pixel values, to the gradient values;
• and
• a cost volume manager configured to determine a cost volume by weighted summing the data groups based on the gradient information and determine the depth information based on the cost volume.

An image processing method, comprising:

• receiving pixel values including brightness information and phase information of an image from outside;
• determining data groups based on target pixel values, which correspond to a range determined according to the phase information;
• calculating gradient values of a region corresponding to the target pixel values and determining gradient information by applying threshold values, which are determined according to the target pixel values, to the gradient values;
• and
• determining a cost volume by weighted summing the data groups based on the gradient information.