title: Sensor modulation transfer function measurement using band-limited laser speckle.
abstract: 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.
authors.affiliation: Aptina Imaging, 3080 N. First Street, San Jose, CA 95124, USA. xchen@aptina.com
authors.forename: Xi
authors.initials: X
authors.lastname: Chen
authors.forename: Nicholas
authors.initials: N
authors.lastname: George
authors.forename: Gennadiy
authors.initials: G
authors.lastname: Agranov
authors.forename: Changmeng
authors.initials: C
authors.lastname: Liu
authors.forename: Bob
authors.initials: B
authors.lastname: Gravelle