normalized box kernel (a matrix of 1s divided by the number of pixels in the
 kernel). The result is a blurred version of the source image.</p>
    </div>

    <div class="section level2">
    <h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">blur</span><span class="op">(</span><span class="va">image</span>, k_height <span class="op">=</span> <span class="fl">5</span>, k_width <span cla