Sensor modulation transfer function measurement using band-limited laser speckle.
A new methodology for image sensor modulation transfer function measurement using band-limited laser speckle is presented. We use a circular opal milk glass diffuser illuminated by a 5 mW He-Ne laser and a linear polarizer to generate band-limited speckle on the sensor. The power spectral density cut-off frequency of the speckle is chosen to be twice that of the sensor Nyquist frequency by placing the sensor at the specific Z location along the optical axis. For the speckle input, we calculate the power spectral density at the sensor using the Rayleigh-Sommerfeld integral and then measure the output power spectral density for the speckle pattern captured by the sensor. With these data, the two-dimensional image sensor modulation transfer function (MTF) is calculated.
Chen
Xi
X
Aptina Imaging, 3080 N. First Street, San Jose, CA 95124, USA. xchen@aptina.com
George
Nicholas
N
Agranov
Gennadiy
G
Liu
Changmeng
C
Gravelle
Bob
B