Imaging and Signal Processing
Shigeyuki Ochi, Tetsuya Iizuka, Masaharu Hamasaki, Yasushi Sato, Tadakuni Narabu, Hideshi Abe, Yoshiaki Kagawa, Keiji Kato · 2022
The resolution of charge-coupled device (CCD) cameras is limited by the aliasing errors associated with spatial discrete sampling on a photosensing area. Image processing for spatially discrete sampling will be described theoretically in a spectrum space. Image processing in this way avoids the spurious spectra which reflect back into the baseband and result in aliasing errors. In order to develop practical color cameras with sufficient resolution, a novel image processing and charge-coupled device structure is proposed which results in shrinking the chip size and easing photolithography. The photosensing array arranged in a two-dimensional face-centered lattice scheme, and the spatial offsetting of three CCD&s;s avoid undesirable signal carriers accompanied by aliasing errors. The frame-transfer approach or an interline-transfer structure is generally employed in conventional charge-coupled area image sensors. In both cases, sensing sites are arranged in a primitive rectangular lattice scheme.