Improved multi-image resolution enhancement for colour images captured by single-CCD cameras

Most consumer cameras use a single CCD sensor and a colour filter array (CFA) to take colour pictures. The array samples the red, green, and blue colour planes on sparse sampling lattices that are not coincident and not necessarily orthogonal. The “raw” images are then interpolated and post-processed to prepare them for display. Existing multiframe enhancement methods use the post-processed colour frames. We present a new multi-image enhancement algorithm which uses the raw image sequence directly to produce improved enhanced-resolution enlargements. We also demonstrate the limitations to resolution enhancement that occur when performing enhanced enlargement on low-resolution CFA-interpolated sequences