A tire pressure monitoring device, being installed in a motor vehicle having a plurality of tires, includes: a plurality of sensor modules being installed onto the tire and having a wireless communication signal transmitter for transmitting a radio frequency signal. The lamp has a reflector, a base connected to the reflector, a burner installed in the reflector, and the base, a first opening located at the reflector and a front part of the lamp, and a second opening located at a rear part of the lamp and exposing the burner. For each platform and language on which a product developer wants a product tested, the product developer provides a test packet that defines tests that the product developer wants conducted on the product in that group. When an image processing is performed based on the combination of the outline information and the chromaticity information, a thickness determination signal is corrected so that the thickness of the character, lines, and like changes continuously.