Method and device for reference imaging and optical object recognition

An electronic device comprising:

• a display panel including a plurality of light sources, the display panel configured to drive first light sources among the plurality of light sources to display an object recognition window on a partial region of the display panel;
• an object recognition sensor configured to continuously obtain a plurality of sequential image frames contemporaneously in a same environment based on reflected light received through the object recognition window while driving the first light sources;
• a processor configured to obtain a plurality of first values by performing a spatial domain signal processing operation on the plurality of sequential image frames, obtain a plurality of second values by performing a frequency domain signal processing operation on the plurality of sequential image frames, obtain one of the plurality of sequential image frames as a first reference image for optical object recognition associated with a first object based on the plurality of the first values and the plurality of second values, the first reference image being an image that does not include the first object, obtain another one of the plurality of sequential image frames as a first object image for optical object recognition associated with the first object based on the plurality of first values and the plurality of, second values, the first object image being an image that includes the first object;
• and
• a memory configured to store the first reference image.

A biometric device comprising:

• a plurality of light-emitting pixels disposed behind a pattern recognition window of a larger display panel;
• a plurality of light-sensing pixels disposed behind the light-emitting pixels in a reflective light path from the pattern recognition window;
• a plurality of memory cells in signal communication with the plurality of light-sensing pixels, respectively, wherein the plurality of memory cells is configured to receive from the plurality of light-sensing pixels a plurality of sequential image frames;
• and
• a processor configured to obtain a plurality of first values by performing a spatial domain signal processing operation on the plurality of sequential image frames, obtain a plurality of second values by performing a frequency domain signal processing operation on the plurality of sequential image frames, obtain one of the plurality of sequential image frames as a reference image based on the plurality of first values and image frames as a raw image based on the plurality of first values and the plurality of second values,
• wherein the raw image and the reference image are contemporaneous,
• wherein the reference image is indicative of a shadow cast by at least the plurality of light-emitting pixels when light emitted by the plurality of light-emitting pixels is reflected back through the pattern recognition window.