METHOD AND ARRANGEMENT FOR OBTAINING IMAGE INFORMATION RELATING TO SURFACE STRUCTURES

摘要

The invention relates to a method for obtaining image information, for example image information relating to the surface of the palm of a hand, the side of a hand, the four fingers extended (2) or an extended thumb, to produce a high quality image. The surface being recorded is placed on a scanning surface (11) which produces an image of the surface structure using a beam path (13). According to the invention, the scanning surface (11) has a height to width ratio of BA:HA<1. The height to width ratio of the image is altered during the optical transmission from the scanning surface (11) to the optoelectronic image converter (17). The height is compressed and/or the width is extended so that the image which is produced on the receiving surface (16) of the image converter (17) is optically distorted, with a height to width ratio BE:HE>1. This is subsequently corrected by an arithmetic operation. The invention also relates to an arrangement for carrying out this method.