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POExplanation of cascade.xml in a haar classifier
 

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  1. POExplanation of cascade.xml in a haar classifier
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    <p>It would be best if someone could explain the numbers/values in the cascade.xml entirely. Example in:</p> <pre><code>&lt;!-- stage 0 --&gt; &lt;_&gt; &lt;maxWeakCount&gt;3&lt;/maxWeakCount&gt; &lt;stageThreshold&gt;-8.8384145498275757e-001&lt;/stageThreshold&gt; &lt;weakClassifiers&gt; &lt;_&gt; &lt;internalNodes&gt; 0 -1 66 5.1593100652098656e-003&lt;/internalNodes&gt; &lt;leafValues&gt; -8.0555558204650879e-001 8.0694979429244995e-001&lt;/leafValues&gt;&lt;/_&gt; &lt;_&gt; &lt;internalNodes&gt; 0 -1 108 1.5044789761304855e-002&lt;/internalNodes&gt; &lt;leafValues&gt; -6.2940740585327148e-001 7.5122624635696411e-001&lt;/leafValues&gt;&lt;/_&gt; &lt;_&gt; &lt;internalNodes&gt; 0 -1 99 -4.7172707127174363e-005&lt;/internalNodes&gt; &lt;leafValues&gt; 5.5112153291702271e-001 -8.6111217737197876e-001&lt;/leafValues&gt;&lt;/_&gt;&lt;/weakClassifiers&gt;&lt;/_&gt; </code></pre> <p>What are the meanings of these values</p> <pre><code> &lt;internalNodes&gt; 0 -1 99 -4.7172707127174363e-005&lt;/internalNodes&gt; </code></pre> <p>Another question is, how does the program know which feature to use for a particular stage? As far as I know, features are in the form as below</p> <pre><code>&lt;_&gt; &lt;rects&gt; &lt;_&gt; 21 6 3 5 -1.&lt;/_&gt; &lt;_&gt; 22 6 1 5 3.&lt;/_&gt;&lt;/rects&gt; &lt;tilted&gt;0&lt;/tilted&gt;&lt;/_&gt; </code></pre> <p>Whereby it's the coordinates of two rectangles, forming something like below:</p> <pre><code>=-= = Black colored rectangle =-= - White colored rectangle =-= =-= =-= </code></pre> <p>What are the values -1. and 3. mean? I know it's weights but how is it used to calculate the feature?</p> <p><strong>Summary</strong></p> <ol> <li>What are the meaning of the values inside <code>&lt;internalNodes&gt;</code>?</li> <li>How is the feature calculated? How are the weights in <code>&lt;rects&gt;</code> use?</li> <li>Most importantly, which field denotes that which features are being used in a particular stage/node.</li> </ol> <p>Thanks!</p>
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    1. COhttp://stackoverflow.com/questions/4482123/whats-inside-a-haar-cascade-classifier-in-open-cv-computer-vision
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    2. CO@AbidRahmanK thanks for the link. FYI i have already read that before posting this. It doesn't provide any answers to my questions.
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