提高影像文档图像质量的预处理研究

纸质文档通过扫描仪扫描后的图像质量会有所降低,为解决此情况,笔者研究并采用影像文档图像预处理技术并提出了改进方法,通过去黑边提高图像压缩比,改善视觉效果;采用二次阈值法确定图像二值化的关键阈值,使用灰度增强和Gaussian卷积滤波相结合的方式消除图像噪音,并使用Hough变换实现影像文档图像的倾斜校正。实验结果表明,这些方法效果良好。

The Preprocessing Research of Improving the Document Image Quality

To solve this problem that the image quality will be somewhat reduced after the paper documents scanned by the scanner, I study the document image pre-processing techniques and propose an improved method. Removing the dark side improves the image compression ratio, and improves the visual effects; using the second threshold determines the critical threshold value of image binary; Using gray enhancing and Gaussian convolution filter reduce image noise, using the Hough transform Achieves Tilt Correction of the image document image. The experimental results show that the proposed methods have achieved rather better result.