Patent ID: 7982785
Filing Date: 2011-07-19
Classification: H04N

Abstract:
1. A streaking correction signal generating circuit comprising: a light-shield waveform detecting unit configured to detect signal levels of respective lines in a horizontal light shield by using an output signal of the horizontal light shield of an image sensor; a black level detecting unit configured to detect a black level by using an output signal of a vertical light shield of the image sensor; and a subtracting unit configured to subtract the black level detected by the black level detecting unit from each of the signal levels of the respective lines in the horizontal light shield detected by the light-shield waveform detecting unit so as to generate streaking correction signals of the respective lines, wherein the light-shield waveform detecting unit includes an average calculator configured to calculate averages of values of pixels constituting the horizontal light shield in units of lines; a digital filter configured to average the pixel averages of the respective lines calculated in the average calculator in a time direction; an ε filter applied in a vertical direction to the pixel averages of the respective lines output from the digital filter; and a median filter applied in the vertical direction to the pixel averages of the respective lines output from the ε filter, and wherein the signal levels of the respective lines in the horizontal light shield are obtained from the median filter.