用VisualC++实现数字图像处理研究

Digital Image Processing Research Based on VisualC++

在信息处理和信息传输中,为了提高其传输的效率并减少信息损失量,需要将大量信息进行压缩编码。数字图像处理中的变换域压缩编码技术是将图像信号以图像数据块为单位作二维变换,然后对各变换系数逐个地进行量化和编码,达到压缩信息的作用。离散余弦变换(DCT)在实数域中得到变换结果,并且有快速算法。本文通过VisualC++编程,对图像进行傅立叶变换、离散余弦变换,通过分析比较原图像和经过变换后的图像及它们的直方图,比较DFT与DCT两种变换域分析方法和两种变换域分析法的特点。

In the information processing and transmission, it is necessary that the data must be encoded and compressed to improve the efficiency of the data transmission and reduce the loss of information. The compressing-code technique in the digital image processing transforming-fieid, based on the unit of image data-block, processes two-dimension transform to the image data. Then, using the coefficient of the transform coefficient matrix, each image data-block is qualified and encoded one by one. Thus, it can be used to code the information. DCT gets the results in the field of real number, and it has efficacious arithmetic. Using the Visual C＋＋ program, this paper process the image transforms of FFT and DCT. By the analysis and comparison of the original image, the image being processed and their histogram, the author shows the methods and characteristics of DFT and DCT.