Digital filtering of APT images from NOAA series satellites

Comparative tests of various filters have been conducted on NOAA/APT meteorological satellite images. It is demonstrated that the best results in terms of noise reduction and blurring effect have been obtained by weighted mean and extremal filters, while other techniques show a nonuniform behavior. It is concluded that these techniques are very useful for 'restoring' noisy received images in connection with the efficient utilization of APT analog data for many applications in which low resolution is acceptable and low cost is required.