教程:用整洁视频插件去除视频噪声

在本教程中 I'll demonstrate how you can use the 整洁的视频 plug-in to remove noise from video, 提高所有输出的输出质量.

对我们大多数人来说，在弱光条件下拍摄是一个现实. A few weeks ago I shot a speech by Democratic congressional candidate Anthony Flaccavento at a local incubator facility, 你可以看到 图1(下面) and in the video above, there's lots of noise in the background, and even on the candidate's face. That's because I had to boost gain to achieve the proper exposure.

图1. Note the video noise in the background and on the subject's face in this clip.

应用视频滤镜

幸运的是, 增益相关的噪声——这很常见, and precisely the problem we're dealing with here—is exactly what the 整洁的视频 filter was designed to correct. 顺便说一下背景, 过滤器, 你可以通过谷歌搜索“整洁的视频过滤器?,起价约为50美元. 它支持流行的专业NLEs，如Premiere pro, Final Cut Pro(包括FCP X), 和拉斯维加斯(以及Adobe After Effects).

Once you've purchased and installed the plug-in for your NLE of choice, you apply it to the clip as you would any other included or installed filter. 图2(下面) 展示了如何在Premiere Pro CS6中选择它.

图2. Selecting the 整洁的视频 filter and applying it to the noisy clip.

创建噪音配置文件

然后单击设置按钮(下面的图3)，将显示全屏视图.

图3. 点击设置按钮.

If you've worked with video that you've created a profile for in the past, 点击加载配置文件按钮(下面的图4)加载配置文件. When you have a number of clips that have the same noise issues, saving a profile—as with audio noise—allows you to save and later reload a noise file from a comparable clip.

图4. 加载配置文件按钮

如果这是你第一次处理某个视频, click Auto Profile instead (to the left of the Load Profile button in 图4, 上图). This tells the 整洁的视频 filter to scan for an area in the image that's flat and has little detail, and thus is a region where it's easy to tell whether the changes it detects between frames are noise, 或者说坐标系中的真实运动. 在部分的框架显示在 图5(下面), 没有真正的运动, so all the motion relates to noise that 过滤器 will attempt to eliminate.

图5. The blue square identifies a section of the frame with no true motion to identify and isolate the video noise.

Over on the right you'll see the 设备噪音概况设置 for the clip (下面的图6). 这里的关键是确保质量设置超过60, which means that 过滤器 found a region that will enable it to accurately discriminate between noise and motion.

图6. 设备噪音概况设置

If you don't have a flat region in the video—if all your video looked like the section of the image highlighted in 图7(下图)-then you'll have to set some of the original noise-related settings manually. 我们稍后会看到如何做到这一点.

图7. A section of the video that's not flat enough to use for auto-profiling