utils_8h.html

Rob Hess Linux下的SIFT提取源码

          <td class="paramname"> <em>n</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>size</em></td><td>&nbsp;</td>
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Doubles the size of an array with error checking. 
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<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>array</em>&nbsp;</td><td>pointer to an array whose size is to be doubled </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>n</em>&nbsp;</td><td>number of elements allocated for <em>array</em> </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>size</em>&nbsp;</td><td>size in bytes of elements in <em>array</em> </td></tr>
  </table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>Returns the new number of elements allocated for <em>array</em>. If no memory is available, returns 0 and frees <em>array</em>. </dd></dl>

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<a class="anchor" name="3ad1a19568fd7f596f8b21818f08ea50"></a><!-- doxytag: member="utils.h::dist_sq_2D" ref="3ad1a19568fd7f596f8b21818f08ea50" args="(CvPoint2D64f p1, CvPoint2D64f p2)" -->
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          <td class="memname">double dist_sq_2D           </td>
          <td>(</td>
          <td class="paramtype">CvPoint2D64f&nbsp;</td>
          <td class="paramname"> <em>p1</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">CvPoint2D64f&nbsp;</td>
          <td class="paramname"> <em>p2</em></td><td>&nbsp;</td>
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<p>
Calculates the squared distance between two points. 
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<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>p1</em>&nbsp;</td><td>a point </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>p2</em>&nbsp;</td><td>another point </td></tr>
  </table>
</dl>

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<a class="anchor" name="52d9d9b5ed7ada25ef5bef84d758d8c5"></a><!-- doxytag: member="utils.h::draw_x" ref="52d9d9b5ed7ada25ef5bef84d758d8c5" args="(IplImage *img, CvPoint pt, int r, int w, CvScalar color)" -->
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          <td class="memname">void draw_x           </td>
          <td>(</td>
          <td class="paramtype">IplImage *&nbsp;</td>
          <td class="paramname"> <em>img</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">CvPoint&nbsp;</td>
          <td class="paramname"> <em>pt</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>r</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>w</em>, </td>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">CvScalar&nbsp;</td>
          <td class="paramname"> <em>color</em></td><td>&nbsp;</td>
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<p>
Draws an x on an image. 
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<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>img</em>&nbsp;</td><td>an image </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>pt</em>&nbsp;</td><td>the center point of the x </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>r</em>&nbsp;</td><td>the x's radius </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>w</em>&nbsp;</td><td>the x's line weight </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>color</em>&nbsp;</td><td>the color of the x </td></tr>
  </table>
</dl>

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<a class="anchor" name="62a43907f02f475f0ca519d7e1eaee6e"></a><!-- doxytag: member="utils.h::stack_imgs" ref="62a43907f02f475f0ca519d7e1eaee6e" args="(IplImage *img1, IplImage *img2)" -->
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          <td class="memname">IplImage* stack_imgs           </td>
          <td>(</td>
          <td class="paramtype">IplImage *&nbsp;</td>
          <td class="paramname"> <em>img1</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">IplImage *&nbsp;</td>
          <td class="paramname"> <em>img2</em></td><td>&nbsp;</td>
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          <td>)</td>
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<p>
Combines two images by scacking one on top of the other. 
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<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>img1</em>&nbsp;</td><td>top image </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>img2</em>&nbsp;</td><td>bottom image</td></tr>
  </table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>Returns the image resulting from stacking <em>img1</em> on top if <em>img2</em> </dd></dl>

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<a class="anchor" name="62f1a48fde6b4a897386edb971119b03"></a><!-- doxytag: member="utils.h::display_big_img" ref="62f1a48fde6b4a897386edb971119b03" args="(IplImage *img, char *title)" -->
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          <td class="memname">void display_big_img           </td>
          <td>(</td>
          <td class="paramtype">IplImage *&nbsp;</td>
          <td class="paramname"> <em>img</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">char *&nbsp;</td>
          <td class="paramname"> <em>title</em></td><td>&nbsp;</td>
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          <td>)</td>
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Displays an image, making sure it fits on screen. 
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cvWaitKey() must be called after this function so the event loop is entered and the image is displayed.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>img</em>&nbsp;</td><td>an image, possibly too large to display on-screen </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>title</em>&nbsp;</td><td>the title of the window in which <em>img</em> is displayed </td></tr>
  </table>
</dl>

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<a class="anchor" name="99b420fa13b30911347fe2cf958c7ca2"></a><!-- doxytag: member="utils.h::vid_view" ref="99b420fa13b30911347fe2cf958c7ca2" args="(IplImage **imgs, int n, char *win_name)" -->
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          <td class="memname">void vid_view           </td>
          <td>(</td>
          <td class="paramtype">IplImage **&nbsp;</td>
          <td class="paramname"> <em>imgs</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&nbsp;</td>
          <td class="paramname"> <em>n</em>, </td>
        </tr>
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          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">char *&nbsp;</td>
          <td class="paramname"> <em>win_name</em></td><td>&nbsp;</td>
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<p>
Allows user to view an array of images as a video. 
<p>
Keyboard controls are as follows:<p>
<ul>
<li>
Space - start and pause playback </li>
<li>
Page Up - skip forward 10 frames </li>
<li>
Page Down - jump back 10 frames </li>
<li>
Right Arrow - skip forward 1 frame </li>
<li>
Left Arrow - jump back 1 frame </li>
<li>
Backspace - jump back to beginning </li>
<li>
Esc - exit playback </li>
<li>
Closing the window also exits playback </li>
</ul>
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<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>imgs</em>&nbsp;</td><td>an array of images </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>n</em>&nbsp;</td><td>number of images in <em>imgs</em> </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>win_name</em>&nbsp;</td><td>name of window in which images are displayed </td></tr>
  </table>
</dl>

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<a class="anchor" name="86394d4951bb8b183ad48ec1d59b1690"></a><!-- doxytag: member="utils.h::win_closed" ref="86394d4951bb8b183ad48ec1d59b1690" args="(char *name)" -->
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          <td class="memname">int win_closed           </td>
          <td>(</td>
          <td class="paramtype">char *&nbsp;</td>
          <td class="paramname"> <em>name</em>          </td>
          <td>&nbsp;)&nbsp;</td>
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<p>
Checks if a HighGUI window is still open or not. 
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<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td valign="top"></td><td valign="top"><em>name</em>&nbsp;</td><td>the name of the window we're checking</td></tr>
  </table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>Returns 1 if the window named <em>name</em> has been closed or 0 otherwise </dd></dl>

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<hr size="1"><address style="text-align: right;"><small>Generated on Tue Oct 30 11:37:27 2007 for SIFT by&nbsp;
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