Automatic electronic camera for label image capture

摘要: A hand held label reader (10) is capable of illuminating a (20), capturing digital image two-dimensional information indicia (15) on the label, and decoding to provide decoded output data terminal (35). The target illuminated by low variation illuminator that includes circular LED array mounted behind plano-convave dispersing lens. automatic electronic camera, which CCD camera control circuitry, uses three images adjust intensity store properly exposed in video RAM. adjusted controlling system gain via adjusting array's integration time, amplifier, provided an analog-to-digital converter. analog-digital-converter compensate for attenuation light through camera's lens assembly. For first image, obtained using default setting gain. analyzed histogram process new settings are determined. second derived from image. intentity adjusted. These used third stored RAM, where it available be microprocessor.