Abstract: In recent years, rapid development of packaging and printing industry, print quality inspection has been given sufficient attention， In this paper, printing quality testing technology at home and abroad, explained the current study，study the development trend of print quality inspection and the traditional detection methods, including subjective visual method, the density detection, color detection method such as a detailed description and point out its advantages and disadvantages in the application. Focuses on the print quality on-line detection system, including print quality online testing works, the implementation of programs, print quality and image processing system line detection, pattern recognition system made a detailed description of instructions.
Keywords：Print Quality; Quality Inspection Method; Online testing
