Method for correcting image quality based on predicted illuminance of projection surface and projector thereof

A projector comprising:

• an input/output interface comprising circuitry configured to input and output an image;
• a projection unit comprising a lamp and/or lens and configured to project the image onto a projection surface;
• a sensor configured to sense the image projected onto the projection surface;
• memory storing at least one instruction;
• and
• at least one processor, comprising processing circuitry, electrically connected to the input/output interface, the projection unit, the sensor, and the memory, and individually and/or collectively, configured to execute the at least one instruction and to cause the projector to:
• obtain an input image of a specified section from the input/output interface;
• obtain a sensing image corresponding to the input image for each specified section from the sensor;
• determine validity of the input image based on at least one of uniformity of color histograms of frames, uniformity of an average picture level, uniformity of variance of the color histograms, and the variance of the color histograms, respectively corresponding to the input image;
• based on determining that the input image is valid, predict illuminance of the projection surface based on a relationship between the input image and the sensing image;
• correct image quality of the input image based on the predicted illuminance of the projection surface;
• and
• output the corrected image through the input/output interface.