| 摘要 |
<p>1511268 High contrast images R E ROTHFJELL 10 June 1975 [14 June 1974] 24882/75 Heading G2X [Also in Division B6] An identity document comprises, mounted on a support, a multi-coloured photograph 1 of the person to be identified and a corresponding photograph 5 in one colour, preferably blue, in which the contrast is enhanced so that only those areas having greater intensity of the said one colour reproduce. The photographs may be taken simultaneously by using a camera with two imaging systems, or alternatively the one colour photograph is produced from the multi-colour one. The document may have several pairs of corresponding photographs as in Figs. 1 and 2.</p> |
