CAMBI，一个带状伪影检测器

Introducing the banding artifacts detector developed by Netflix aiming at further improving the delivered video quality

介绍Netflix开发的带状伪影检测器，旨在进一步提高交付的视频质量。

Banding artifacts can be pretty annoying. But, first of all, you may wonder, what is a banding artifact?

带状伪影可能是相当恼人的。但是，首先，你可能想知道，什么是带状伪影？

Banding artifact?

带状伪装？

You are at home enjoying a show on your brand-new TV. Great content delivered at excellent quality. But then, you notice some bands in an otherwise beautiful sunset scene. What was that? A sci-fi plot twist? Some device glitch? More likely, banding artifacts, which appear as false staircase edges in what should be smoothly varying image areas.

你在家里用你的全新电视欣赏节目。伟大的内容以卓越的质量传送。但是，你注意到在一个美丽的夕阳场景中出现了一些带子。那是什么？一个科幻情节的转折？一些设备故障？更有可能的是，带状伪影，在本应平滑变化的图像区域出现虚假的阶梯状边缘。

Bands can show up in the sky in that sunset scene, in dark scenes, in flat backgrounds, etc. In any case, we don’t like them, nor should anybody be distracted from the storyline by their presence.

带子可以出现在那个日落场景的天空中，在黑暗的场景中，在平坦的背景中，等等。在任何情况下，我们都不喜欢它们，也不应该让任何人因为它们的存在而分散对故事情节的注意力。

Just a subtle change in the video signal can cause banding artifacts. This slight variation in the value of some pixels disproportionately impacts the perceived quality. Bands are more visible (and annoying) when the viewing conditions are right: large TV with good contrast and a dark environment without screen reflections.

视频信号中的一个细微变化就会导致带状伪影。一些像素值的轻微变化会对感知质量产生不成比例的影响。在观看条件合适的情况下，频带更明显（也更烦人）：大电视有良好的对比度，黑暗环境没有屏幕反射。

Some examples below. Since we don’t know where and when you are reading this blog post, we exaggerate the banding artifacts, so you get the gist. The first example is from the opening scene of one of our first shows. Check out the sky. Do you see the bands? The viewing environment (background brightness, ambient lighting, screen brightness, contrast, viewing distance) influences the bands’ visibility. You may play with those factors and observe how the perception of banding is affected.

下面是一些例子。由于我们不知道你在何时何地阅读这篇博文，所以我们夸大了带状伪影，这样你就会明白其中的要点。第一个例子来自我们第一个节目的开场。看一下天空。你看到带...