The Bayer checkboard pattern is used on most color digital sensor R G R G R G G B G B G B R G R G R G Blur Pattern: G B G B G B ys R G R G R G G B G B G B Xs The sensor is used with a four-spot optical low pass filter. The spot separation is half the pixel pitch (X.=ys). (a) What is the effective blue pixel aperture for the sensor? (b) Plot the blue pixel MTFs for the original sensor and for the sensor combine with the optical low pass filter. Also show the sensor Nyquist frequency on the plot. (c) Describe the system performance difference between the original sensor and the sensor combined with the optical low pass filter? Has the aliasing issue be eliminated? (d) When you design an imaging lens for this sensor without optical low pass filter, what is the requirement on MTF so that the sensor is the limiting factor in imaging performance