?? opencv用戶手冊之圖像處理部分（之二）：采樣、差值與幾何變換（中文翻譯） - hunnish的opencv專欄.htm
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<DT>fillval
<DD>用來填充邊界外面的值 </DD></DL>
<P>函數 <SPAN lang=EN-US><A
href="file:///C:/DOCUME~1/user/LOCALS~1/Temp/FrontPageTempDir/pvw1.htm#decl_cvWarpAffine">cvWarpAffine</A>
利用下面指定的矩陣變換輸入圖像：</SPAN></P><PRE>dst(x&apos;,y&apos;)<-src(x,y)
如果沒有指定<SPAN lang=EN-US> CV_WARP_INVERSE_MAP ， (x&apos;,y&apos;)<SUP>T</SUP>=map_matrix?(x,y,1)<SUP>T</SUP>+b ,</SPAN>
否則，<SPAN lang=EN-US> (x, y)<SUP>T</SUP>=map_matrix?(x&apos;,y&apos,1)<SUP>T</SUP>+b</SPAN>
</PRE>
<P>函數與 <SPAN lang=EN-US><A
href="file:///C:/DOCUME~1/user/LOCALS~1/Temp/FrontPageTempDir/pvw1.htm#decl_cvGetQuadrangleSubPix">cvGetQuadrangleSubPix</A>
類似，但是不完全相同。 <A
href="file:///C:/DOCUME~1/user/LOCALS~1/Temp/FrontPageTempDir/pvw1.htm#decl_cvWarpAffine">cvWarpAffine</A>
要求輸入和輸出圖像具有同樣的數據類型，有更大的資源開銷（因此對大圖像不太合適）而且輸出圖像的部分可以保留不變。而 <A
href="file:///C:/DOCUME~1/user/LOCALS~1/Temp/FrontPageTempDir/pvw1.htm#decl_cvGetQuadrangleSubPix">cvGetQuadrangleSubPix</A>
可以精確地從8位圖像中提取四邊形到浮點數緩存區中，具有比較小的系統開銷，而且總是全部改變輸出圖像的內容。</SPAN></P>
<P>要變換稀疏矩陣，使用<SPAN lang=EN-US> cxcore 中的函數 <A
href="file:///C:/DOCUME~1/user/LOCALS~1/Temp/FrontPageTempDir/pvw1.htm#decl_cvTransform">cvTransform</A>
。</SPAN></P>
<HR>
<H3><A name=decl_cv2DRotationMatrix>2DRotationMatrix</A></H3>
<P class=Blurb><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: Helvetica; mso-hansi-font-family: Helvetica">計算二維旋轉的仿射變換矩陣</SPAN></P><PRE>CvMat* cv2DRotationMatrix( CvPoint2D32f center, double angle,
double scale, CvMat* map_matrix );
</PRE>
<P>
<DL>
<DT>center
<DD>輸入圖像的旋轉中心
<DT>angle
<DD>旋轉角度（度）。正值表示逆時針旋轉<SPAN lang=EN-US>(坐標原點假設在左上角).</SPAN>
<DT>scale
<DD>各項同性的尺度因子
<DT>map_matrix
<DD>輸出<SPAN lang=EN-US> 2×3 矩陣的指針</SPAN> </DD></DL>
<P>函數 <SPAN lang=EN-US><A
href="file:///C:/DOCUME~1/user/LOCALS~1/Temp/FrontPageTempDir/pvw1.htm#decl_cv2DRotationMatrix">cv2DRotationMatrix</A>
計算矩陣:</SPAN></P><PRE>[ α β | (1-α)*center.x - β*center.y ]
[ -β α | β*center.x + (1-α)*center.y ]
where α=scale*cos(angle), β=scale*sin(angle)
</PRE>
<P>該變換映射旋轉中心到它本身。如果這不是目的的話，應該調整平移（<SPAN lang=EN-US>Hunnish: 這段話令人費解：The
transformation maps the rotation center to itself. If this is not the purpose,
the shift should be adjusted）</SPAN></P>
<HR>
<H3><A name=decl_cvWarpPerspective>WarpPerspective</A></H3>
<P class=Blurb><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: Helvetica; mso-hansi-font-family: Helvetica">對圖像進行透視變換</SPAN></P><PRE>void cvWarpPerspective( const CvArr* src, CvArr* dst, const CvMat* map_matrix,
int flags=CV_INTER_LINEAR+CV_WARP_FILL_OUTLIERS,
CvScalar fillval=cvScalarAll(0) );
</PRE>
<P>
<DL>
<DT>src
<DD>輸入圖像.
<DT>dst
<DD>輸出圖像.
<DT>map_matrix
<DD><SPAN lang=EN-US>3×3 變換矩陣</SPAN>
<DT>flags
<DD>差值方法的開關選項:
<UL>
<LI>CV_WARP_FILL_OUTLIERS - <SPAN
lang=EN-US>填充所有縮小圖像的象素。如果部分象素落在輸入圖像的邊界外，那么它們的值設定為 </SPAN><CODE><SPAN
lang=EN-US>fillval</SPAN></CODE><SPAN lang=EN-US>.</SPAN>
<LI>CV_WARP_INVERSE_MAP - <SPAN lang=EN-US>指定 </SPAN><CODE><SPAN
lang=EN-US>matrix</SPAN></CODE><SPAN lang=EN-US>
是輸出圖像到輸入圖像的反變換，因此可以直接用來做象素差值。否則, 函數從 </SPAN><CODE><SPAN
lang=EN-US>map_matrix 得到反變換。</SPAN></CODE> </LI></UL>
<DT>fillval
<DD>用來填充邊界外面的值 </DD></DL>
<P>函數 <SPAN lang=EN-US><A
href="file:///C:/DOCUME~1/user/LOCALS~1/Temp/FrontPageTempDir/pvw1.htm#decl_cvWarpPerspective">cvWarpPerspective</A>
利用下面指定矩陣變換輸入圖像：</SPAN></P><PRE>dst(x&apos;,y&apos;)<-src(x,y)
若指定<SPAN lang=EN-US> CV_WARP_INVERSE_MAP， (tx&apos;,ty&apos;,t)<SUP>T</SUP>=map_matrix?(x,y,1)<SUP>T</SUP>+b</SPAN>
否則，<SPAN lang=EN-US> (tx, ty, t)<SUP>T</SUP>=map_matrix?(x&apos;,y&apos,1)<SUP>T</SUP>+b</SPAN>
</PRE>
<P>要變換稀疏矩陣，使用<SPAN lang=EN-US> cxcore 中的函數 <A
href="file:///C:/DOCUME~1/user/LOCALS~1/Temp/FrontPageTempDir/pvw1.htm#decl_cvTransform">cvTransform</A>
。</SPAN></P>
<HR>
<H3><A name=decl_cvWarpPerspectiveQMatrix>WarpPerspectiveQMatrix</A></H3>
<P class=Blurb><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: Helvetica; mso-hansi-font-family: Helvetica">用</SPAN><SPAN
lang=EN-US>4</SPAN><SPAN
style="FONT-FAMILY: 宋體; mso-ascii-font-family: Helvetica; mso-hansi-font-family: Helvetica">個對應點計算透視變換矩陣</SPAN></P><PRE>CvMat* cvWarpPerspectiveQMatrix( const CvPoint2D32f* src,
const CvPoint2D32f* dst,
CvMat* map_matrix );
</PRE>
<P>
<DL>
<DT>src
<DD>輸入圖像的四邊形的<SPAN lang=EN-US>4個點坐標</SPAN>
<DT>dst
<DD>輸出圖像的對應四邊形的<SPAN lang=EN-US>4個點坐標</SPAN>
<DT>map_matrix
<DD>輸出的<SPAN lang=EN-US> 3×3 矩陣</SPAN> </DD></DL>
<P>函數 <SPAN lang=EN-US><A
href="file:///C:/DOCUME~1/user/LOCALS~1/Temp/FrontPageTempDir/pvw1.htm#decl_cvWarpPerspectiveQMatrix">cvWarpPerspectiveQMatrix</A>
計算透視變換矩陣，使得：</SPAN></P><PRE>(t<SUB>i</SUB>x'<SUB>i</SUB>,t<SUB>i</SUB>y'<SUB>i</SUB>,t<SUB>i</SUB>)<SUP>T</SUP>=matrix?(x<SUB>i</SUB>,y<SUB>i</SUB>,1)<SUP>T</SUP>
</PRE>
<P>where <CODE>dst(i)=(x'<SUB>i</SUB>,y'<SUB>i</SUB>),
src(i)=(x<SUB>i</SUB>,y<SUB>i</SUB>), i=0..3</CODE>.</P><BR><BR>
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<DIV class=postTitle>stone 發表于2004-09-03 2:48 PM IP:
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