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- <h1>Source code for ipfml.processing.segmentation</h1><div class="highlight"><pre>
- <span></span><span class="sd">"""</span>
- <span class="sd">All segmentation methods applied on images</span>
- <span class="sd">"""</span>
- <span class="c1"># main imports</span>
- <span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
- <span class="c1"># image processing imports</span>
- <span class="kn">from</span> <span class="nn">PIL</span> <span class="k">import</span> <span class="n">Image</span>
- <div class="viewcode-block" id="divide_in_blocks"><a class="viewcode-back" href="../../../ipfml/ipfml.processing.segmentation.html#ipfml.processing.segmentation.divide_in_blocks">[docs]</a><span class="k">def</span> <span class="nf">divide_in_blocks</span><span class="p">(</span><span class="n">image</span><span class="p">,</span> <span class="n">block_size</span><span class="p">,</span> <span class="n">pil</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
- <span class="sd">'''Divide image into equal size blocks</span>
- <span class="sd"> Args:</span>
- <span class="sd"> image: PIL Image or Numpy array</span>
- <span class="sd"> block: tuple (width, height) representing the size of each dimension of the block</span>
- <span class="sd"> pil: block type returned as PIL Image (default True)</span>
- <span class="sd"> Returns:</span>
- <span class="sd"> list containing all 2D Numpy blocks (in RGB or not)</span>
- <span class="sd"> Raises:</span>
- <span class="sd"> ValueError: If `image_width` or `image_height` are not compatible to produce correct block sizes</span>
- <span class="sd"> Example:</span>
- <span class="sd"> >>> import numpy as np</span>
- <span class="sd"> >>> from PIL import Image</span>
- <span class="sd"> >>> from ipfml.processing import transform, segmentation</span>
- <span class="sd"> >>> image_values = np.random.randint(255, size=(800, 800, 3))</span>
- <span class="sd"> >>> blocks = segmentation.divide_in_blocks(image_values, (20, 20))</span>
- <span class="sd"> >>> len(blocks)</span>
- <span class="sd"> 1600</span>
- <span class="sd"> >>> blocks[0].width</span>
- <span class="sd"> 20</span>
- <span class="sd"> >>> blocks[0].height</span>
- <span class="sd"> 20</span>
- <span class="sd"> >>> img_l = Image.open('./images/test_img.png')</span>
- <span class="sd"> >>> L = transform.get_LAB_L(img_l)</span>
- <span class="sd"> >>> blocks_L = segmentation.divide_in_blocks(L, (100, 100))</span>
- <span class="sd"> >>> len(blocks_L)</span>
- <span class="sd"> 4</span>
- <span class="sd"> >>> blocks_L[0].width</span>
- <span class="sd"> 100</span>
- <span class="sd"> '''</span>
- <span class="n">blocks</span> <span class="o">=</span> <span class="p">[]</span>
- <span class="n">mode</span> <span class="o">=</span> <span class="s1">'RGB'</span>
- <span class="c1"># convert in Numpy array</span>
- <span class="n">image_array</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">(</span><span class="n">image</span><span class="p">)</span>
- <span class="c1"># check dimension of input image</span>
- <span class="k">if</span> <span class="n">image_array</span><span class="o">.</span><span class="n">ndim</span> <span class="o">!=</span> <span class="mi">3</span><span class="p">:</span>
- <span class="n">mode</span> <span class="o">=</span> <span class="s1">'L'</span>
- <span class="n">image_width</span><span class="p">,</span> <span class="n">image_height</span> <span class="o">=</span> <span class="n">image_array</span><span class="o">.</span><span class="n">shape</span>
- <span class="k">else</span><span class="p">:</span>
- <span class="n">image_width</span><span class="p">,</span> <span class="n">image_height</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">image_array</span><span class="o">.</span><span class="n">shape</span>
- <span class="c1"># check size compatibility</span>
- <span class="n">width</span><span class="p">,</span> <span class="n">height</span> <span class="o">=</span> <span class="n">block_size</span>
- <span class="k">if</span> <span class="p">(</span><span class="n">image_width</span> <span class="o">%</span> <span class="n">width</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">):</span>
- <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">"Width size issue, block size not compatible"</span><span class="p">)</span>
- <span class="k">if</span> <span class="p">(</span><span class="n">image_height</span> <span class="o">%</span> <span class="n">height</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">):</span>
- <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">"Height size issue, block size not compatible"</span><span class="p">)</span>
- <span class="n">nb_block_width</span> <span class="o">=</span> <span class="n">image_width</span> <span class="o">/</span> <span class="n">width</span>
- <span class="n">nb_block_height</span> <span class="o">=</span> <span class="n">image_height</span> <span class="o">/</span> <span class="n">height</span>
- <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">nb_block_width</span><span class="p">)):</span>
- <span class="n">begin_x</span> <span class="o">=</span> <span class="n">i</span> <span class="o">*</span> <span class="n">width</span>
- <span class="k">for</span> <span class="n">j</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="nb">int</span><span class="p">(</span><span class="n">nb_block_height</span><span class="p">)):</span>
- <span class="n">begin_y</span> <span class="o">=</span> <span class="n">j</span> <span class="o">*</span> <span class="n">height</span>
- <span class="c1"># getting sub block information</span>
- <span class="n">current_block</span> <span class="o">=</span> <span class="n">image_array</span><span class="p">[</span><span class="n">begin_x</span><span class="p">:(</span><span class="n">begin_x</span> <span class="o">+</span> <span class="n">width</span><span class="p">),</span> <span class="n">begin_y</span><span class="p">:(</span>
- <span class="n">begin_y</span> <span class="o">+</span> <span class="n">height</span><span class="p">)]</span>
- <span class="k">if</span> <span class="n">pil</span><span class="p">:</span>
- <span class="n">blocks</span><span class="o">.</span><span class="n">append</span><span class="p">(</span>
- <span class="n">Image</span><span class="o">.</span><span class="n">fromarray</span><span class="p">(</span><span class="n">current_block</span><span class="o">.</span><span class="n">astype</span><span class="p">(</span><span class="s1">'uint8'</span><span class="p">),</span> <span class="n">mode</span><span class="p">))</span>
- <span class="k">else</span><span class="p">:</span>
- <span class="n">blocks</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">current_block</span><span class="p">)</span>
- <span class="k">return</span> <span class="n">blocks</span></div>
- </pre></div>
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