Abstract: A CCD image detector includes an image area array, a storage area array, a buffer area array, and a readout shift register, all of which being controlled by a timing controller through separate and independent clock signals. The timing controller controls the transfer of the charge content of an image from the image area array to the storage area array and batch transfers of the charge content of the image from the storage area array to the buffer area array in bands of adjacent rows of gates. Between such batch transfers of bands, the timing controller controls the transfer of the charge content of the band stored in the buffer area array to the readout shift register one row of gates at a time at a slow rate to permit the charge content of each row to be shifted out from the readout register. The batch transfers of bands has the effect of minimizing slow rate transfers from the storage area array which reduces the impact of degraded charge transfer efficiency on performance of the image detector.

Abstract: A CCD image detector includes a buffer area array separate from an image area array and a storage area array, the buffer area array being controlled independently of the image and storage area arrays to transfer its charge contents to a read out register of the CCD in the process of reading out a collected image or portion thereof. A method of operating the CCD image detector is also disclosed.

Abstract: A system and method which substantially eliminates systematic error in a centroid determination of reconstructed waveforms from images generated by an image sensor. In accordance with the invention, a predetermined wavefront error is added to an input wavefront and the wavefront is detected. The predetermined wavefront error is effective to improve centroid determination. In the illustrative embodiment, the input wavefront is passed through a random phase plate. The phase plate is an optical window in which the thickness in a z-axis varies randomly over an X/Y plane. The random phase plate acts as a low pass filter and the output of the phase plate is an aberrated wavefront. That is, the nonuniform thickness of the phase plate generates random spatial phase errors in the optical wavefront. The autocorrelation function of the phase plate is such that random phase errors in the optical wavefront will filter out spatial frequencies higher than one cycle per pixel.