original perception
1.Sensation and perception are sensible cognition that thesense organs produce when objective tings act on sense organs, and they conserve the original experiences of human in the log.
2.It is shown that,if the scanning resolution meets the recommendation by CCITT on G_3 and G_4 facsimile apparatus,then the visual-perception effect of the two-level rendition by comparison with the Bayer ma-trix is almost the same as that of the original half-tone pictures.
