Optical scanner do not distinguish text from illustrations.
光学扫描仪不能区分文本和图形。
Absrtact: Document text images captured by book scanner or camera usually require resolution enhancement for other usage, present a text image enhancement algorithm based on Markov random field.
摘要：对于扫描或相机拍摄的低分辨率文本图片，提出一种基于马尔科夫随机场的文本图像清晰化算法。
Scanner: An equipment that converts photographic or hand-drawn original into digital data. An OCR machine can converts typed or printed text into digital data.
扫描机：把书稿或相片转为数码资料的机器。光学文字识别机是扫描机的一种，它把打字字体或印刷字体转为数码资料。
Electronic page composition system: a complete system comprises the colour scanner, text input, a CPU that provides masking, page assembly, tint applying functions and a laser image setter.
电子排版系统：一套完整的系统设备包括分色机、文字输入机、具有拼版及在版面上加蒙片和平网等功能的中央处理机和激光图文影排机。
Electronic page composition system: a complete system comprises the colour scanner, text input, a CPU that provides masking, page assembly, tint applying functions and a laser image setter.
电子排版系统：一套完整的系统设备包括分色机、文字输入机、具有拼版及在版面上加蒙片和平网等功能的中央处理机和激光图文影排机。
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