Film digitizers vs. CCD scanners

Sensor Model for Airborne Ccd Linear Scanners

This paper describes a sensor model for the georeferencing of imagery acquired by CCD linear array sensors with along-track stereo viewing carried on airplane. The model consists of two main algorithms for direct and indirect georeferencing. If positioning instruments (GPS,INS) provide the sensor external orientation (position, attitude) during the image acquisition, the ground coordinates of p...

Hummingbird , Automatic Film Digitizers at the Stanford Linear Accelerator Center

Sensor Calibration of Three-line Ccd Scanners on Zy-3

ZY-3 is the first Chinese civilian high-resolution stereo mapping satellite. ZY-3 is equipped with three-line scanners (nadir, backward and forward views with 2.5m and 4.0m resolutions, respectively) and an additional multispectral scanner. In order to improve the mapping and positioning accuracy, sensor in-orbit calibration is a crucial procedure especially for high-resolution mapping-enabled ...

CCD vs. CMOS: Facts and Fiction

past five years of the potential for CMOS imagers and of the impending demise of the incumbent image-sensing technology, CCDs. Strong claims by the proponents of a resurgent CMOS technology have been countered by equally forceful claims by CCD defenders. In a pattern typical of battling technologies (both with significant merits but also lacking maturity in some regards), users have become leer...

An Evaluation of MTF Determination Methods for 35mm Film Scanners

Three different techniques were used to determine the Modulation Transfer Function (MTF) of a 35mm film scanner. The first involved scanning sine wave charts comprising a number of patches with different frequencies of known modulation. The second method involved the scanning and Fourier transform of a photographic grain noise pattern to simulate low modulation white noise. Finally, the ISO 122...