Image recording method

Abstract

Abstract PURPOSE: To enable expression of bright parts of images even in the case of a recorder which conventionally cannot express bright portions by a method wherein the shade of high optical density regions is recorded by the change of voltage while the shade of low optical density regions is recorded by the combinations of density levels and the background density level. CONSTITUTION: Recording optical density is set to 16 levels differentiated by equal density difference, and the signal steps providing respective density levels are set to 16 steps, i.e. from step O to step 15, the step 0 being the background density of a recording surface. For the steps 7W15, each density level is provided by only changing the voltage, and the matrix sizes for the steps are minimum unit of 1×1. For the steps 1W6, use is made of not only the voltage changes but such tendency of matrix size that it increases with brightness. The larger the matrix size is, the smaller the image element information density is, as indicated in a broken line. Suppose each optical density level occurs in equal probability in an image surface, then the average image information density will be as indicated in a single- dotted line. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Hiroyoshi Tsuchiya

Bibliographic Details