Method of obtaining reference image for optical object recognition and method of performing optical object recognition using the same

A method of performing optical object recognition, the method comprising:

• driving a subset of light sources of a plurality of light sources included in a display panel, the subset of light sources corresponding to an object recognition window which is a partial region of the display panel;
• obtaining, using an object recognition sensor, a plurality of reference images while the subset of light sources are driven, each of the plurality of reference images being an image which does not include a first target object;
• obtaining, using at least one environmental sensor, a plurality of environment information corresponding to the plurality of reference images while the subset of light sources are driven;
• obtaining, using the object recognition sensor, a first target image including the first target object while the subset of light sources are driven;
• obtaining, using the environmental sensor, current environment information corresponding to the first target image while the subset of light sources are driven;
• selecting a first reference image among the plurality of reference images based on the current environment information and the plurality of environment information;
• and
• obtaining a first effective image for the first target object based on the first target image and the first reference image.

A method of obtaining a reference image for optical object recognition, the method comprising:

• driving a subset of light sources of a plurality of light sources included in a display panel, the subset of light sources corresponding to an object recognition window which is a partial region of the display panel;
• receiving, using an object recognition sensor, light reflected through the object recognition window, the light emitted by the subset of light sources;
• sequentially obtaining a plurality of images based on the reflected light while the subset of light sources are driven;
• obtaining at least one of the plurality of images as a first reference image, the first reference image being an image which does not include a first target object, the obtaining the at least one of the plurality of images as the first reference image including,
• obtaining a plurality of first values by performing spatial signal processing on the plurality of images,
• obtaining a plurality of second values by performing frequency signal processing on the plurality of images, and
• selecting at least one image among the plurality of images as the first reference image based on a corresponding first value, a corresponding second value, a spatial domain threshold value, and a frequency domain threshold value;
• obtaining a first target image associated with the first target object based on the reflected light while the subset of light sources are driven;
• obtaining at least one first environment information using at least one environmental sensor while the subset of light sources are driven, the first environment information being associated with a surrounding environment in which the subset of light sources are driven;
• storing the first reference image and the first environment information for the first reference image together;
• and
• obtaining a first effective image for optical object recognition associated with the first target object based on the first target image and the first reference image.