Study On The Newspaper Of Printing Quality Detection Based On Microphtograhy

In the process of newspaper printing, the detection and control of ink volume is an importantnode. At present, the main approach is to add measurement control at the edge of the prints, and tomeasure the field density on the bars using densitometer in order to realize the detection and controlof printing ink quantity. However, the newspaper print puts emphasizes on the timeliness andaesthetics to supply customers directly without cutting. The sample edge cannot add the controlstrip, and the newspaper pressmen can only estimate ink quantity based on personal experience bynaked eye. The newspaper pressmen cannot give accurate quantitative values in the process ofnewspaper printing, so a new method to make the ink quantity control should be proposed toreplace of the existing subjective evaluation based on the pressmen’s experience.In order to make up the existing problems of the control and detection of ink quantity in theprocess of the newspaper printing, this paper puts forward a newspaper printing detection methodbased on microscopic photography. Firstly, use CCD micro camera to get the partial enlargedimages of the sample text and color images on newspaper. Secondly, the partial enlarged images areprocessed by image preprocessing techniques such as image equalization processing, morphologicalprocessing and the OSTU threshold segmentation, and then calculate the printing ink quantity of thegreen, magenta, yellow and black color. Finally, calculate the differences between the calculatedquantity of inks and the predefined quantity of inks to realize the direct detection and control of theink quantity. In the research process, the newspaper printing ink detection system is developedbased on the method of the paper, and makes the error analysis and verification using densitometer.The newspaper printing ink detection system is easy to operate and has been achieved good resultsin the printing factory. Through the constantly improving, the newspaper printing ink detectionsystem can solve the problems of the real-time detection and control of the newspaper printing inkquantity, and has high application value to improve the domestic newspaper printing quality control.