| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To improve quality of a photographed image to be displayed, even when an image quality level is switched-over according to increase/decrease of travel speed. <P>SOLUTION: Brightness L of an image quality preset value is fixed to a reference preset value Ls in a stopping speed region (V=0), and it is fixed to a reference preset value Lc in a travel speed region (V≥Vs). Between the stopping speed region and the travel speed region, a continuous variation speed region (0<V<Vs) is provided, in which the brightness L is continuously changed according to vehicle speed V. In the continuous variation speed region, the brightness L is changed between the brightness values Ls, Lc fixedly set to the two fixed speed regions (V=0, V≥Vs) before and after the continuous variation speed region, respectively, in linear proportion to the vehicle speed V. That is, the brightness is fixed to satisfy brightness L=Ls in the stopping speed region (V=0), proportionally changed to satisfy brightness L=((Lc-Ls)/Vs)V+Ls in the continuous variation speed region (0<V<Vs), and fixed to satisfy brightness L=Lc in the travel speed region (V≥Vs). <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
