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数字图象处理入门,非常好的书！！！！推荐！

style='font-size:10.5pt;font-family:"Times New Roman"'>(x<sub>1</sub>,y<sub>1</sub>)
</span><span lang=ZH-CN style='font-size:10.5pt'>，分几种情况进行处理。</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'><o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span lang=ZH-CN style='font-size:10.5pt'>先看</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'>x</span><span
lang=ZH-CN style='font-size:10.5pt'>方向</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'>(width</span><span lang=ZH-CN style='font-size:
10.5pt'>指图象的宽度</span><span style='font-size:10.5pt;font-family:"Times New Roman"'>)<o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span style='font-size:10.5pt;font-family:
"Times New Roman"'>(1)</span><span style='font-size:7.0pt;font-family:"Times New Roman"'>&nbsp;&nbsp;&nbsp;
</span><span style='font-size:10.5pt;font-family:"Times New Roman"'>t<sub>x</sub></span><span
lang=ZH-CN style='font-size:10.5pt'>≤</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'>-width</span><span lang=ZH-CN style='font-size:
10.5pt'>：很显然，图象完全移出了屏幕，不用做任何处理；</span><span style='font-size:10.5pt;font-family:
"Times New Roman"'><o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span style='font-size:10.5pt;font-family:
"Times New Roman"'>(2)</span><span style='font-size:7.0pt;font-family:"Times New Roman"'>&nbsp;&nbsp;&nbsp;
</span><span style='font-size:10.5pt;font-family:"Times New Roman"'>-width&lt;tx</span><span
lang=ZH-CN style='font-size:10.5pt'>≤</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'>0</span><span lang=ZH-CN style='font-size:10.5pt'>：如图</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'>2.5</span><span
lang=ZH-CN style='font-size:10.5pt'>所示。容易看出，图象区域的</span><span style='font-size:
10.5pt;font-family:"Times New Roman"'>x</span><span lang=ZH-CN
style='font-size:10.5pt'>范围从</span><span style='font-size:10.5pt;font-family:
"Times New Roman"'>0</span><span lang=ZH-CN style='font-size:10.5pt'>到</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'>width-|tx|,</span><span
lang=ZH-CN style='font-size:10.5pt'>对应原图的范围从</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'>|tx|</span><span lang=ZH-CN style='font-size:
10.5pt'>到</span><span style='font-size:10.5pt;font-family:"Times New Roman"'>width</span><span
lang=ZH-CN style='font-size:10.5pt'>；</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'><o:p></o:p></span></p>

<p class=a style='margin:0cm;margin-bottom:.0001pt;line-height:18.0pt'><!--[if gte vml 1]><v:shape
 id="_x0000_i1033" type="#_x0000_t75" alt="" style='width:297.75pt;height:273pt'>
 <v:imagedata src="./chp2.files/image009.jpg" o:href="http://www-scf.usc.edu/~flv/ipbook/chap02.files/image018.jpg"/>
</v:shape><![endif]--><![if !vml]><img width=397 height=364
src="./chp2.files/image009.jpg" v:shapes="_x0000_i1033"><![endif]></p>

<p align=center style='margin:0cm;margin-bottom:.0001pt;text-align:center;
line-height:18.0pt'><b><span lang=ZH-CN style='font-size:10.5pt'>图</span></b><b><span
style='font-size:10.5pt;font-family:"Times New Roman"'>2.5&nbsp;&nbsp;&nbsp;&nbsp;
tx</span></b><b><span lang=ZH-CN style='font-size:10.5pt'>≤</span></b><b><span
style='font-size:10.5pt;font-family:"Times New Roman"'>0</span></b><b><span
lang=ZH-CN style='font-size:10.5pt'>，</span></b><b><span style='font-size:10.5pt;
font-family:"Times New Roman"'>ty</span></b><b><span lang=ZH-CN
style='font-size:10.5pt'>≤</span></b><b><span style='font-size:10.5pt;
font-family:"Times New Roman"'>0</span></b><b><span lang=ZH-CN
style='font-size:10.5pt'>的情况</span></b><span style='font-size:10.5pt;
font-family:"Times New Roman"'><o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span style='font-size:10.5pt;font-family:
"Times New Roman"'>(3)</span><span style='font-size:7.0pt;font-family:"Times New Roman"'>&nbsp;&nbsp;&nbsp;
</span><span style='font-size:10.5pt;font-family:"Times New Roman"'>0&lt; t<sub>x</sub>
&lt;width</span><span lang=ZH-CN style='font-size:10.5pt'>：如图</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'>2.6</span><span
lang=ZH-CN style='font-size:10.5pt'>所示。容易看出，图象区域的</span><span style='font-size:
10.5pt;font-family:"Times New Roman"'>x</span><span lang=ZH-CN
style='font-size:10.5pt'>范围从</span><span style='font-size:10.5pt;font-family:
"Times New Roman"'>t<sub>x</sub> </span><span lang=ZH-CN style='font-size:10.5pt'>到</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'>width</span><span
lang=ZH-CN style='font-size:10.5pt'>，对应原图的范围从</span><span style='font-size:
10.5pt;font-family:"Times New Roman"'>0</span><span lang=ZH-CN
style='font-size:10.5pt'>到</span><span style='font-size:10.5pt;font-family:
"Times New Roman"'>width - t<sub>x </sub></span><span lang=ZH-CN
style='font-size:10.5pt'>；</span><span style='font-size:10.5pt;font-family:
"Times New Roman"'><o:p></o:p></span></p>

<p class=a style='margin:0cm;margin-bottom:.0001pt;line-height:18.0pt'><!--[if gte vml 1]><v:shape
 id="_x0000_i1034" type="#_x0000_t75" alt="" style='width:312.75pt;height:256.5pt'>
 <v:imagedata src="./chp2.files/image010.jpg" o:href="http://www-scf.usc.edu/~flv/ipbook/chap02.files/image020.jpg"/>
</v:shape><![endif]--><![if !vml]><img width=417 height=342
src="./chp2.files/image010.jpg" v:shapes="_x0000_i1034"><![endif]></p>

<p align=center style='margin:0cm;margin-bottom:.0001pt;text-align:center;
line-height:18.0pt'><b><span lang=ZH-CN style='font-size:10.5pt'>图</span></b><b><span
style='font-size:10.5pt;font-family:"Times New Roman"'>2.6&nbsp;&nbsp;&nbsp;&nbsp;
0&lt; tx&lt;width</span></b><b><span lang=ZH-CN style='font-size:10.5pt'>，</span></b><b><span
style='font-size:10.5pt;font-family:"Times New Roman"'>0&lt;ty&lt;height</span></b><b><span
lang=ZH-CN style='font-size:10.5pt'>的情况</span></b><span style='font-size:10.5pt;
font-family:"Times New Roman"'><o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span style='font-size:10.5pt;font-family:
"Times New Roman"'>(4)</span><span style='font-size:7.0pt;font-family:"Times New Roman"'>&nbsp;&nbsp;&nbsp;
</span><span style='font-size:10.5pt;font-family:"Times New Roman"'>t<sub>x</sub>
</span><span lang=ZH-CN style='font-size:10.5pt'>≥</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'>width</span><span
lang=ZH-CN style='font-size:10.5pt'>：很显然，图象完全移出了屏幕，不用做任何处理。</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'><o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span style='font-size:10.5pt;font-family:
"Times New Roman"'>y</span><span lang=ZH-CN style='font-size:10.5pt'>方向是对应的</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'>(height</span><span
lang=ZH-CN style='font-size:10.5pt'>表示图象的高度</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'>)</span><span lang=ZH-CN style='font-size:10.5pt'>：</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'><o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span style='font-size:10.5pt;font-family:
"Times New Roman"'>(1)</span><span style='font-size:7.0pt;font-family:"Times New Roman"'>&nbsp;&nbsp;&nbsp;
</span><span style='font-size:10.5pt;font-family:"Times New Roman"'>t<sub>y</sub></span><span
lang=ZH-CN style='font-size:10.5pt'>≤</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'>-height</span><span lang=ZH-CN style='font-size:
10.5pt'>，图象完全移出了屏幕，不用做任何处理；</span><span style='font-size:10.5pt;font-family:
"Times New Roman"'><o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span style='font-size:10.5pt;font-family:
"Times New Roman"'>(2)</span><span style='font-size:7.0pt;font-family:"Times New Roman"'>&nbsp;&nbsp;&nbsp;
</span><span style='font-size:10.5pt;font-family:"Times New Roman"'>-height&lt;t<sub>y</sub></span><span
lang=ZH-CN style='font-size:10.5pt'>≤</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'>0</span><span lang=ZH-CN style='font-size:10.5pt'>，图象区域的</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'>y</span><span
lang=ZH-CN style='font-size:10.5pt'>范围从</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'>0</span><span lang=ZH-CN style='font-size:10.5pt'>到</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'>height-|t<sub>y</sub>|,</span><span
lang=ZH-CN style='font-size:10.5pt'>对应原图的范围从</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'>|t<sub>y</sub>|</span><span lang=ZH-CN
style='font-size:10.5pt'>到</span><span style='font-size:10.5pt;font-family:
"Times New Roman"'>height</span><span lang=ZH-CN style='font-size:10.5pt'>；</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'><o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span style='font-size:10.5pt;font-family:
"Times New Roman"'>(3)</span><span style='font-size:7.0pt;font-family:"Times New Roman"'>&nbsp;&nbsp;&nbsp;
</span><span style='font-size:10.5pt;font-family:"Times New Roman"'>0&lt;t<sub>y</sub>&lt;height
</span><span lang=ZH-CN style='font-size:10.5pt'>，图象区域的</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'>y</span><span
lang=ZH-CN style='font-size:10.5pt'>范围从</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'>t<sub>y</sub></span><span lang=ZH-CN
style='font-size:10.5pt'>到</span><span style='font-size:10.5pt;font-family:
"Times New Roman"'>height,</span><span lang=ZH-CN style='font-size:10.5pt'>对应原图的范围从</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'>0</span><span
lang=ZH-CN style='font-size:10.5pt'>到</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'>height-t<sub>y</sub></span><span lang=ZH-CN
style='font-size:10.5pt'>；</span><span style='font-size:10.5pt;font-family:
"Times New Roman"'><o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span style='font-size:10.5pt;font-family:
"Times New Roman"'>(4)</span><span style='font-size:7.0pt;font-family:"Times New Roman"'>&nbsp;&nbsp;&nbsp;
</span><span style='font-size:10.5pt;font-family:"Times New Roman"'>t<sub>y</sub></span><span
lang=ZH-CN style='font-size:10.5pt'>≥</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'>height</span><span lang=ZH-CN style='font-size:
10.5pt'>，图象完全移出了屏幕，不用做任何处理。</span><span style='font-size:10.5pt;font-family:
"Times New Roman"'><o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span lang=ZH-CN style='font-size:10.5pt'>这种做法利用了位图存储的连续性，即同一行的象素在内存中是相邻的。利用</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'>memcpy</span><span
lang=ZH-CN style='font-size:10.5pt'>函数，从</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'>(x<sub>0</sub>,y<sub>0</sub>)</span><span
lang=ZH-CN style='font-size:10.5pt'>点开始，一次可以拷贝一整行</span><span style='font-size:
10.5pt;font-family:"Times New Roman"'>(</span><span lang=ZH-CN
style='font-size:10.5pt'>宽度为</span><span style='font-size:10.5pt;font-family:
"Times New Roman"'>x<sub>1</sub></span><span lang=ZH-CN style='font-size:10.5pt'>－</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'>x<sub>0</sub>)</span><span
lang=ZH-CN style='font-size:10.5pt'>，然后将内存指针移到</span><span style='font-size:
10.5pt;font-family:"Times New Roman"'>(x<sub>0</sub>,y<sub>0</sub>+1)</span><span
lang=ZH-CN style='font-size:10.5pt'>处，拷贝下一行。这样拷贝</span><span style='font-size:
10.5pt;font-family:"Times New Roman"'>(y<sub>1</sub>-y<sub>0</sub>)</span><span
lang=ZH-CN style='font-size:10.5pt'>行就完成了全部操作，避免了一个一个象素的计算，提高了效率。</span><span
style='font-size:10.5pt;font-family:"Times New Roman"'>Translation</span><span
lang=ZH-CN style='font-size:10.5pt'>的源代码如下：</span><span style='font-size:10.5pt;
font-family:"Times New Roman"'><o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span style='font-size:10.5pt;font-family:
"Times New Roman"'>int&nbsp;&nbsp;&nbsp; xOffset=0,yOffset=0;<o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span style='font-size:10.5pt;font-family:
"Times New Roman"'>BOOL Translation(HWND hWnd)<o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span style='font-size:10.5pt;font-family:
"Times New Roman"'>{<o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify:
inter-ideograph;line-height:18.0pt'><span style='font-size:10.5pt;font-family:
"Times New Roman"'>DLGPROC&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; dlgInputBox = NULL;<o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;text-align:justify;text-justify: