| 摘要 |
<p>A digitized image obtained by sensing noisy radiations is processed in a central unit. The image is considered to be an array of pixel intensity values that is decomposed into p elementary arrays of n pixels which are then ordered into a processing array with p rows and n columns. A discrete cosine transform is applied to this array so as to deduce the n significant factors. A reconstructed processing array is then reconstructed by taking account of the most significant functions, and from this is deduced a reconstituted image in which the high-frequency noise is reduced, preserving satisfactory contrast.</p> |
