rong>b</strong>: the output matrix.</li>
  <li><strong>type</strong>:the type of output matrix, if 0, ccv will create a CCV_8U | CCV_C1 matrix.</li>
  <li><strong>size</strong>: the underlying Sobel filter size.</li>
  <li><strong>low_thresh</strong>: the low threshold that makes the point interesting.</li>
  <li><strong>high_thresh</strong>: the high threshold that makes the point acceptable.</li>
</ul>

<h2 id="ccvotsu">ccv_otsu</h2>

<pre><code>int ccv_otsu(ccv_dense_matrix_t* a, double* outvar, int rang