So far , the researches on font recognition are time - wasting in feature extraction , or strict in printed quality of those document . so , these methods can not be applied in ocr system 到目前为止，对字体识别所作的研究，或者提取特征花费大量时间，或者对待识别文本的印刷质量要求较为严格，使得研究结果不能应用于ocr系统。
The color printing register marks detection system based on computer vision is used in on - line of off - line detection of the color register marks in the printing industry in the purpose of positioning the printing plate on - line or analyzing the printing quality off - line 本文研究的基于计算机视觉的彩色印刷套准标识检测系统应用于印刷工业中彩色套准标识的在线或离线检测,目的是为了在线控制印刷设备印版的机械定位或离线分析印刷设备的彩色印刷质量。
1 background as well as emphasizing the quality of commodity , package quality should be focused on , like fruit package , food and beverage package . in the past , we just focused on rigidity of packaging box , not on printing quality of exterior package . now both are involved in 商品除加强本身的质量外，更注重的是包装质量的竟争，像水果包装食品饮料包装，过去只求包装箱的强度，不强调外包装的印刷质量，现在已发展到要求外包装能印刷出高质量的彩色物品图案。
Lifting and lowering of the pringting arm of this machine is vertical , therefore , in case of half - tone printing , presence of screen wire and consistency of aberration are improved ; in case of spot printing , stability and uniformity of inking are enhanced ; fine adjustment and lock of the worktable is independent of each other , so positioning error caused by lock of the worktable can be controlled ; height and pressure of the printing blade and ink - returning blade can be stepless - regulated separately , which improver printing quality and service life of half - tone ; printing travel and half - tone fixing mechanism can be fast adjusted , which is suitable for printing area with different size 本机印刷大臂升降为垂直升隆式，网线版印刷时网线表现率为色差一致性得到提高，实地版印刷的施墨稳定性及均匀性得以加强；工作台微调与锁紧独立，因工作台锁紧而带来的定位误差得以控制；印刷刀、回墨刀高度及压力均可单独无级调节，提高了印刷质量和网版的使用寿命，印刷行程和网版固定机构大小可快速调节，方便不同规格的印刷面积。
Apply computer chip to control the circuit ; omron opto - elecrtonic control - ler and panasonic and mitsubishi inverter have stable performance , high precision , rapid reaction and long life - span ; the controlling plate applies tactile operation board which is handled easily ; vertical structural screen is easy to adjust the vertical printing pressure so as to ensure the quality of printing ; the frame lift is driven by electrical motor and installed with imported linear guide rails , of which the speed - adjust device , scraper and scraping blade can be adjusted within15 to 45 and can be set for many times so as to repeatedly printing with good precision and output , the flat bed is made of 2mm stain - less steel plates which are flat , smooth and indeformable ; it is also equiped with micromatic setting device in order to ensure the precision of multi - color overprint and auto air - intake device to ensure strong adsorption 采用电脑板控制电路,欧姆龙光电控制器,松下,三菱变频器,行直稳定.精度高,反应快,寿命长,控制面板采用触摸式操作面板,操作方便,六式结构型网版垂直升降印刷压力可调保证印刷质量,机架升降采用电机驱动安装进口直线导轨,刮刀、回墨刀可在15一45角调整,可设置多次,重复印刷保证产品精度.平台板采用2毫米不锈钢板制作,平整光滑不变形配有微调装置,确保多色套印精度,配自动吸气装置,确保强有力的吸附。
According to the ink color evaluation of the water - soluble ink color performance analysis , timely in the production of films for separation of trichromatic color ink deviation compensation adjustment so that indian goods to achieve the desired color and density , the higher the quality of printing 根据油墨颜色的评价指标对水性油墨的呈色性能进行分析，及时的在制作分色片时对三原色油墨的颜色偏差进行补偿调节，从而使印品达到预期的色调及密度，得到较高的印刷质量。
The thesis will directly help to further developing the close looped color control system of modern printers . the principle of transforming color spaces and color separation greatly contributes to the deep research of color reproduction in theory and the software developed has some applied value in printing quality control and image processing 本课题的研究对进一步开发现代印刷机的闭环色彩控制有直接的指导作用：课题中提出的色空间转换及分色原理对深入研究色彩复制理论有重要的理论价值；开发出的软件在印刷质量检测和控制以及图像处理中有一定的应用价值。
