Apparatus and method for compensating for black level

摘要

An apparatus and method for compensating for a black level in order to solve a screen flickering phenomenon and a problem of convergence speed of a black level value. The apparatus for compensating for a black level includes: a black pixel average value extraction unit averaging black pixel values of a current frame to determine a black pixel average value; a luminance value extraction unit extracting a luminance value from an analog gain and concentration time information of an image sensor; a black level extraction unit calculating a frame weight by using the luminance value and acquiring a black level value of a current frame by using the frame weight, the black pixel average value, and a black level value of a previous frame; and a black level compensation unit compensating for valid pixel values of the current frame by using the black level value of the current frame.

主权项

1. An apparatus for compensating for a black level, the apparatus comprising:
a black pixel average value extraction unit, operative to determine a black pixel average value of a current frame by averaging black pixel values of the current frame; a luminance value extraction unit, operative to extract a luminance value from an analog gain and concentration time information of an image sensor; a black level extraction unit, connected to the black pixel average value extraction unit and the luminance value extraction unit, operative to calculate a frame weight by using the luminance value and determine a black level value of the current frame by using the frame weight, the black pixel average value, and a black level value of a previous frame; and a black level compensation unit, connected to the black level extraction unit, operative to compensate for valid pixel values of the current frame by using the black level value of the current frame, wherein the luminance value extraction unit is operative to determine the luminance value by multiplying the analog gain by the concentration time information to obtain a resultant value, and dividing the resultant value by a normalization factor.