Popular recipes by J W J http://code.activestate.com/recipes/users/4181154/2012-09-14T17:07:50-07:00ActiveState Code RecipesSaving a Tkinter canvas image or animation using PIL (Python)
2012-03-05T04:09:00-08:00J W Jhttp://code.activestate.com/recipes/users/4181154/http://code.activestate.com/recipes/578063-saving-a-tkinter-canvas-image-or-animation-using-p/
<p style="color: grey">
Python
recipe 578063
by <a href="/recipes/users/4181154/">J W J</a>
(<a href="/recipes/tags/borderless/">borderless</a>, <a href="/recipes/tags/canvas_save/">canvas_save</a>, <a href="/recipes/tags/imagegrab/">imagegrab</a>).
Revision 2.
</p>
<p>Demonstrates saving an animation done on Tkinter canvas as a series of jpeg images</p>
Sudoku Game Generator (Python)
2012-09-14T17:07:50-07:00J W Jhttp://code.activestate.com/recipes/users/4181154/http://code.activestate.com/recipes/578250-sudoku-game-generator/
<p style="color: grey">
Python
recipe 578250
by <a href="/recipes/users/4181154/">J W J</a>
(<a href="/recipes/tags/game/">game</a>, <a href="/recipes/tags/python/">python</a>, <a href="/recipes/tags/sudoku/">sudoku</a>).
Revision 3.
</p>
<p>Outputs difficult games with solutions.</p>
Test various OpenCV feature detectors in Python (Python)
2012-09-13T16:07:21-07:00J W Jhttp://code.activestate.com/recipes/users/4181154/http://code.activestate.com/recipes/578261-test-various-opencv-feature-detectors-in-python/
<p style="color: grey">
Python
recipe 578261
by <a href="/recipes/users/4181154/">J W J</a>
(<a href="/recipes/tags/feature_detection/">feature_detection</a>, <a href="/recipes/tags/opencv/">opencv</a>).
</p>
<p>Iterates through all feature detectors (that didn't crash my computer) and plots the point results.</p>
Trifocal Tensor class (Python)
2012-08-28T14:16:47-07:00J W Jhttp://code.activestate.com/recipes/users/4181154/http://code.activestate.com/recipes/578248-trifocal-tensor-class/
<p style="color: grey">
Python
recipe 578248
by <a href="/recipes/users/4181154/">J W J</a>
.
</p>
<p>A class that creates a trifocal tensor from either a pair of camera matrices or three corresponding point sets.
<code>Trifocal( Pi, Pii )</code>
<code>Trifocal( x0, x1, x2 )</code>
Includes methods for testing constraints, retrieving epipoles and fundamental matrices.</p>
trifocal tensor from two camera matrices (Python)
2012-06-27T03:38:35-07:00J W Jhttp://code.activestate.com/recipes/users/4181154/http://code.activestate.com/recipes/578170-trifocal-tensor-from-two-camera-matrices/
<p style="color: grey">
Python
recipe 578170
by <a href="/recipes/users/4181154/">J W J</a>
(<a href="/recipes/tags/tensor/">tensor</a>, <a href="/recipes/tags/trifocal/">trifocal</a>).
Revision 4.
</p>
<p>Get the 3x3x3 (27 element) trifocal tensor from two 3x4 camera matrices.</p>
<pre class="prettyprint"><code>T[i,j,k] = A[j,i]*B[k,4] - A[j,4]*B[k,i]
</code></pre>
Python+OpenCV: Camera frame grab and sobel display (Python)
2012-03-22T07:21:35-07:00J W Jhttp://code.activestate.com/recipes/users/4181154/http://code.activestate.com/recipes/578085-pythonopencv-camera-frame-grab-and-sobel-display/
<p style="color: grey">
Python
recipe 578085
by <a href="/recipes/users/4181154/">J W J</a>
(<a href="/recipes/tags/opencv/">opencv</a>, <a href="/recipes/tags/python/">python</a>).
Revision 2.
</p>
<p>A couple snippets grabbed from other sources and put together here.
Demonstrates:
Conversion to greyscale: cv.CvtColor,
Sobel operator: cv.Sobel,
Smoothing: cv.Smooth</p>