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<div class="title">test_jpeg_top.py</div>  </div>
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<a href="test__jpeg__top_8py.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"><a class="line" href="namespacetest__jpeg__top.html">    1</a></span>&#160;<span class="stringliteral">&quot;&quot;&quot;</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="stringliteral">Example of using Cocotb to send image files in to the opencores JPEG Encoder</span></div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="stringliteral">and check that the output is sufficiently similar to the input.</span></div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="stringliteral"></span></div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="stringliteral">NB Limited to 96x96 images since we&#39;re using a static JPEG header.</span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="stringliteral">&quot;&quot;&quot;</span></div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="keyword">import</span> os</div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="keyword">import</span> logging</div><div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="keyword">from</span> itertools <span class="keyword">import</span> izip</div><div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="keyword">from</span> PIL <span class="keyword">import</span> Image</div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;</div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="keyword">import</span> cocotb</div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="keyword">from</span> cocotb.result <span class="keyword">import</span> TestFailure</div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="keyword">from</span> cocotb.regression <span class="keyword">import</span> TestFactory</div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="keyword">from</span> cocotb.clock <span class="keyword">import</span> Clock</div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;</div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="keyword">from</span> interfaces <span class="keyword">import</span> ImageDriver, JpegMonitor</div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;</div><div class="line"><a name="l00020"></a><span class="lineno"><a class="line" href="namespacetest__jpeg__top.html#a44c5558440d05c0d059de5f712a8fa88">   20</a></span>&#160;<span class="keyword">def </span><a class="code" href="namespacetest__jpeg__top.html#a44c5558440d05c0d059de5f712a8fa88">compare</a>(i1, i2):</div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;    <span class="stringliteral">&quot;&quot;&quot;</span></div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="stringliteral">    Compare the similarity of two images</span></div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="stringliteral"></span></div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="stringliteral">    From http://rosettacode.org/wiki/Percentage_difference_between_images</span></div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="stringliteral">    &quot;&quot;&quot;</span></div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;    <span class="keyword">assert</span> i1.mode == i2.mode, <span class="stringliteral">&quot;Different kinds of images.&quot;</span></div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;    <span class="keyword">assert</span> i1.size == i2.size, <span class="stringliteral">&quot;Different sizes.&quot;</span></div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;    pairs = izip(i1.getdata(), i2.getdata())</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;    dif = sum(abs(c1-c2) <span class="keywordflow">for</span> p1,p2 <span class="keywordflow">in</span> pairs <span class="keywordflow">for</span> c1,c2 <span class="keywordflow">in</span> zip(p1,p2))</div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    ncomponents = i1.size[0] * i1.size[1] * 3</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;    <span class="keywordflow">return</span> (dif / 255.0 * 100) / ncomponents</div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;</div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;</div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;@cocotb.coroutine</div><div class="line"><a name="l00036"></a><span class="lineno"><a class="line" href="namespacetest__jpeg__top.html#a1c4023ca3084258aa0b62e63a62d1a52">   36</a></span>&#160;<span class="keyword">def </span><a class="code" href="namespacetest__jpeg__top.html#a1c4023ca3084258aa0b62e63a62d1a52">process_image</a>(dut, filename=&quot;&quot;, debug=False, threshold=0.22):</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;    <span class="stringliteral">&quot;&quot;&quot;Run an image file through the jpeg encoder and compare the result&quot;&quot;&quot;</span></div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;    cocotb.fork(Clock(dut.clk, 100).start())</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;</div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    driver = ImageDriver(dut)</div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    monitor = JpegMonitor(dut)</div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;    <span class="keywordflow">if</span> debug:                                            <span class="comment"># pragma: no cover</span></div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;        driver.log.setLevel(logging.DEBUG)</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;        monitor.log.setLevel(logging.DEBUG)</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    stimulus = Image.open(filename)</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    <span class="keywordflow">yield</span> driver.send(stimulus)</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    output = <span class="keywordflow">yield</span> monitor.wait_for_recv()</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;    <span class="keywordflow">if</span> debug:                                            <span class="comment"># pragma: no cover</span></div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;        output.save(filename + <span class="stringliteral">&quot;_process.jpg&quot;</span>)</div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;    difference = <a class="code" href="namespacetest__jpeg__top.html#a44c5558440d05c0d059de5f712a8fa88">compare</a>(stimulus, output)</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;    dut.log.info(<span class="stringliteral">&quot;Compressed image differs to original by %f%%&quot;</span> % (difference))</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;    <span class="keywordflow">if</span> difference &gt; threshold:                           <span class="comment"># pragma: no cover</span></div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;        <span class="keywordflow">raise</span> TestFailure(<span class="stringliteral">&quot;Resulting image file was too different (%f &gt; %f)&quot;</span> %</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;                          (difference, threshold))</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;</div><div class="line"><a name="l00062"></a><span class="lineno"><a class="line" href="namespacetest__jpeg__top.html#ac181cb84026bf35e987ab931f6ed0d2e">   62</a></span>&#160;tf = TestFactory(process_image)</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;tf.add_option(<span class="stringliteral">&quot;filename&quot;</span>, [os.path.join(<span class="stringliteral">&#39;test_images&#39;</span>, f)</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;                            <span class="keywordflow">for</span> f <span class="keywordflow">in</span> os.listdir(<span class="stringliteral">&#39;test_images&#39;</span>)])</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;tf.generate_tests()</div><div class="ttc" id="namespacetest__jpeg__top_html_a1c4023ca3084258aa0b62e63a62d1a52"><div class="ttname"><a href="namespacetest__jpeg__top.html#a1c4023ca3084258aa0b62e63a62d1a52">test_jpeg_top.process_image</a></div><div class="ttdeci">def process_image( dut,  filename=&quot;&quot;,  debug=False,  threshold=0.22)</div><div class="ttdef"><b>Definition:</b> <a href="test__jpeg__top_8py_source.html#l00036">test_jpeg_top.py:36</a></div></div>
<div class="ttc" id="namespacetest__jpeg__top_html_a44c5558440d05c0d059de5f712a8fa88"><div class="ttname"><a href="namespacetest__jpeg__top.html#a44c5558440d05c0d059de5f712a8fa88">test_jpeg_top.compare</a></div><div class="ttdeci">def compare( i1,  i2)</div><div class="ttdef"><b>Definition:</b> <a href="test__jpeg__top_8py_source.html#l00020">test_jpeg_top.py:20</a></div></div>
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