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<h1><a name="_Toc486331862"></a><a name="_Toc486332861"></a><a
name="_Toc486338970"></a><a name="_Toc454810835"></a><a name="_Toc454856609"><span><span>前<span>
</span></span></span></a><span><span><span style='font-family:黑体;"Times New Roman"'>言</span></span></span></h1>
<p style='line-height:18.0pt'><span
style='font-family:宋体;"Times New Roman"'>当你看到那些用</span><span lang=EN-US>PhotoShop</span><span
style='font-family:宋体;"Times New Roman"'>或</span><span lang=EN-US>Corel PhotoPaint</span><span
style='font-family:宋体;"Times New Roman"'>等软件绘制出的精美图片，并被它们表现出的神奇效果所折服时，是否曾想到做一个自己的图象处理软件？就象</span><span
lang=EN-US>PhotoShop</span><span style='font-family:宋体;"Times New Roman";"Times New Roman"'>那样。“怎么可能，吹牛吧！”你一定会这么说。呵呵，别着急，待我慢慢讲来。</span></p>
<p style='line-height:18.0pt'><span
style='font-family:宋体;"Times New Roman"'>我是一名清华大学计算机系的研究生，一直对图象处理、多媒体的东西非常着迷，选修过不少这方面的课程，做过许多有意思的实验。我常常有这样一种冲动：把我做过的这些东西拿出来与大家一起分享，把有关的原理、算法、程序介绍给大家。</span></p>
<p style='line-height:18.0pt'><span
style='font-family:宋体;"Times New Roman"'>有这种想法的另一个原因是：数字图象处理</span><span lang=EN-US>(Digital
Image Processing)</span><span style='font-family:宋体;
"Times New Roman"'>技术是一门非常实用的技术。</span><span lang=EN-US>PhotoShop</span><span
style='font-family:宋体;"Times New Roman"'>的核心就是图象处理技术。而目前有关这方面的资料太少了，已有的书不是内容太陈旧</span><span
lang=EN-US>(</span><span style='font-family:宋体;
"Times New Roman"'>还停留在</span><span lang=EN-US>DOS</span><span
style='font-family:宋体;"Times New Roman"'>下的</span><span lang=EN-US>CGA</span><span style='font-family:
宋体;"Times New Roman"'>，</span><span
lang=EN-US>EGA</span><span style='font-family:宋体;
"Times New Roman"'>甚至汇编编程阶段</span><span lang=EN-US>)</span><span
style='font-family:宋体;"Times New Roman"'>，就是理论性太强，不容易懂，没有例子，看过以后也不知道该如何编程。我想：如果能够通过实际的例子来介绍这些图象处理算法，大家就很容易理解了。</span></p>
<p style='line-height:18.0pt'><span
style='font-family:宋体;"Times New Roman"'>这本书的侧重点是介绍数字图象编程，因此在内容的选择上也有所考虑，介绍的都是图象处理中的基本算法，大多可以用程序实现。而那些理论性很强，不易编程的算法，在这本书里是找不到的。书中的每一章可以看做是一个专题，后面都附有实际运行通过的源程序例子，全部程序都采用</span><span
lang=EN-US>Windows</span><span style='font-family:宋体;"Times New Roman";"Times New Roman"'>编程</span><span
lang=EN-US>(</span><span style='font-family:宋体;
"Times New Roman"'>不过我并不打算介绍</span><span lang=EN-US>Windows</span><span
style='font-family:宋体;"Times New Roman"'>的编程，这已经超出了本书的范围</span><span lang=EN-US>)</span><span
style='font-family:宋体;"Times New Roman"'>。</span></p>
<p style='line-height:18.0pt'><span
style='font-family:宋体;"Times New Roman"'>下面是本书的主要内容：</span></p>
<p style='line-height:18.0pt;
'> <span
lang=EN-US>(1)<span style='font:7.0pt "Times New Roman"'> </span></span>
<span
lang=EN-US>windows</span><span style='font-family:宋体;"Times New Roman";"Times New Roman"'>位图</span><span
lang=EN-US>bitmap(</span><span style='font-family:宋体;"Times New Roman";"Times New Roman"'>即</span><span
lang=EN-US>bmp</span><span style='font-family:宋体;
"Times New Roman"'>文件</span><span lang=EN-US>)</span><span
style='font-family:宋体;"Times New Roman"'>的结构和调色版的概念；</span></p>
<p style='line-height:18.0pt;
'> <span
lang=EN-US>(2)<span style='font:7.0pt "Times New Roman"'> </span></span>
<span
style='font-family:宋体;"Times New Roman"'>图象的平移、旋转、镜象变换、转置变换、放缩；</span></p>
<p style='line-height:18.0pt;
'> <span
lang=EN-US>(3)<span style='font:7.0pt "Times New Roman"'> </span></span>
<span
style='font-family:宋体;"Times New Roman"'>图象的平滑</span><span lang=EN-US>(</span><span style='font-family:
宋体;"Times New Roman"'>去噪声</span><span
lang=EN-US>)</span><span style='font-family:宋体;
"Times New Roman"'>、锐化；</span></p>
<p style='line-height:18.0pt;
'> <span
lang=EN-US>(4)<span style='font:7.0pt "Times New Roman"'> </span></span>
<span
style='font-family:宋体;"Times New Roman"'>图象的半影调、抖动技术；</span></p>
<p style='line-height:18.0pt;
'> <span
lang=EN-US>(5)<span style='font:7.0pt "Times New Roman"'> </span></span>
<span
style='font-family:宋体;"Times New Roman"'>图象的直方图修正、彩色变换；</span></p>
<p style='line-height:18.0pt;
'> <span
lang=EN-US>(6)<span style='font:7.0pt "Times New Roman"'> </span></span>
<span
style='font-family:宋体;"Times New Roman"'>图象的腐蚀和膨胀效果、细化算法、骨架的提取；</span></p>
<p style='line-height:18.0pt;
'> <span
lang=EN-US>(7)<span style='font:7.0pt "Times New Roman"'> </span></span>
<span
style='font-family:宋体;"Times New Roman"'>图象的边沿检测与抽取、</span><span lang=EN-US>hough</span><span
style='font-family:宋体;"Times New Roman"'>变换、轮廓跟踪；</span></p>
<p style='line-height:18.0pt;
'> <span
lang=EN-US>(8)<span style='font:7.0pt "Times New Roman"'> </span></span>
<span
style='font-family:宋体;"Times New Roman"'>图象的检测、模板匹配；</span></p>
<p style='line-height:18.0pt;
'> <span
lang=EN-US>(9)<span style='font:7.0pt "Times New Roman"'> </span></span>
<span
style='font-family:宋体;"Times New Roman"'>图象的压缩编码、</span><span lang=EN-US>JPEG</span><span
style='font-family:宋体;"Times New Roman"'>压缩编码标准；</span></p>
<p style='line-height:18.0pt;
'> <span
lang=EN-US>(10)</span> <span style='font-family:宋体;"Times New Roman";"Times New Roman"'>图象处理编程工具</span><span
lang=EN-US>lead.ocx</span><span style='font-family:宋体;"Times New Roman";"Times New Roman"'>、</span><span
lang=EN-US>DirectDraw</span><span style='font-family:宋体;"Times New Roman";"Times New Roman"'>及简单的多媒体编程技术。</span></p>
<p style='line-height:18.0pt'><span
style='font-family:宋体;"Times New Roman"'>这里面有一些非常有趣的应用。例如第</span><span lang=EN-US>4</span><span
style='font-family:宋体;"Times New Roman"'>章介绍了一个将一幅图象转换成</span><span lang=EN-US>ASCII</span><span
style='font-family:宋体;"Times New Roman"'>码的算法。对于喜欢上</span><span lang=EN-US>BBS</span><span
style='font-family:宋体;"Times New Roman"'>的读者，这个算法是非常有用的。在第</span><span lang=EN-US>10</span><span
style='font-family:宋体;"Times New Roman"'>章，介绍了一款非常实用的图象处理编程工具</span><span lang=EN-US>lead.ocx</span><span
style='font-family:宋体;"Times New Roman"'>，利用它可以很快地开发出非常棒的图象处理软件。</span></p>
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