Green Signal Interpolation of a Single-Imaging Device Color Camera with a Bayer Array of Primary Color Filters
Naoki Ozawa · The Journal of The Institute of Image Information and Television Engineers · 2003
A new method for producing interpolated signals between a sampled green signal of a single-imaging device color camera with a Bayer array of primary color filters was developed. The method is accomplished by extracting a block of 8-by-8 signals so that sampled green signals exist on all the pixel locations of the block by rotating the axes of the block. The method provides a set of frequency coefficients using a discrete cosine transformation with the block. It also provides interpolated signals that correspond to the interpolation location using inverse discrete cosine transformations with the set of frequency coefficients. The method can reduce errors in the signals by more than 18dB compared with the conventional linear interpolation method.