The authors propose thinking in terms of histograms, which means that the output image should rely on statistical similarities with the source images.

而这篇文章的作者提出从直方图的角度思考，这意味着输出图像应该基于和原图的统计相似性。

It's essentially like a histogram or a bar chart.

它本质上类似于直方图或条形图。

I need to figure out how to use a histogram of oriented gradients to detect a face.

我需要弄清楚如何使用定向梯度直方图来检测人脸。

Now there are a couple of techniques that exist to detect edges, but we are going to use a histogram of oriented gradients, or an HOG.

现在有几种技术可以检测边缘，但我们将使用定向梯度直方图或 HOG。