INFORMATION CODE READING DEVICE AND READING METHOD, AND INFORMATION CODE DISPLAY READING SYSTEM

摘要

It is an object to provide an information code reading device, a reading method and an information code display reading system that can obtain information code data from a photographed image signal obtained by photographing a display screen even if no symbol region is set in an information code, wherein the symbol region becomes a reference when the photographed image signal is subjected to sampling. When the information code displayed on a display device is read out, first, an image signal is extracted as a first image signal from the photographed image signal obtained by photographing the display screen when all pixel cells of the display screen emit light. Next, an image signal obtained during a displaying period of the information code is extracted as a second image signal from the photographed image signal. At this point, a center of light-emitting balance for each pixel cell based on the first image signal while the second video signal is subjected to sampling at the center of the light-emitting balance, so that information code data indicative of the information code are obtained.