 edges.</p></li>
<li><p>Edge Tracking by Hysteresis â€“ Retains strong edges.</p></li>
</ol>
<p><strong>Parameters:</strong></p>
<ul class="simple">
<li><p><strong>rgb_array</strong> (numpy.ndarray or memoryviewslice, shape (w, h, n), dtype uint8):
Input image as a 3D array with RGB(A), BGRA, or other pixel formats.</p></li>
<li><p><strong>threshold</strong> (unsigned char, default = 50):
Lower-bound threshold to suppress weak edges in gradient magnitude.</p></li>
<li><p><strong>low</strong> (