unsigned char, default = 0):
Lower hysteresis threshold for edge tracking.
Weak edges below this value are discarded.</p></li>
<li><p><strong>high</strong> (unsigned char, default = 20):
Upper hysteresis threshold for edge tracking.
Strong edges above this value are retained.</p></li>
</ul>
<p><strong>Returns:</strong></p>
<ul class="simple">
<li><p>pygame.Surface â€“ A new surface/image with detected edges.</p></li>
</ul>
<p><strong>Notes:</strong></p>
<ul class="simple">
<li><p>Higher <c