Consider what the index action scenes and how it technically works on the TV. This description is appropriate for the index action scenes of any manufacturer.

  • Active Motion & Resolution(AMR): TV Toshiba
  • Clear motion rate (CMR), Picture Quality Index (PQI): TV Samsung
  • Motion Clarity Index (MCI), Tru Motion: TV LG
  • Motionflow XR: TV Sony
  • Backlight scanning (BLS): TV Panasonic
  • Clear Motion Index (CMI): TV Thomson
  • Perfect Motion Rate (PMR): TV Philips
  • Subfield Motion в plasma: Samsung

This article was written in 2015; I decided to update it and remember how TV manufacturers advertised their televisions by inventing different index scenes of picture quality.

History of the Dynamic Scene Index in TV’s

After the advent of digital television, there were more options for content management since the television’s processor was already processing it. This made it possible to develop different indices, which were supposed to rank the TVs in terms of image quality. But in practice, it was just marketing, with some manufacturer’s image quality indexes or dynamic scenes reaching unfathomable numbers in the tens of thousands. Also, to indicate the hertz were used initially, you could find a TV with an index of 10000 Hz, which was utterly impossible.

Then people started to sue the TV manufacturers, and as they couldn’t explain what Hertzian is, they disappeared pretty fast, and the only numbers we have are the ones without an explanation of what they mean. The peak of all indexes was in 2013, then some TV manufacturers’ original indexes were replaced by new indexes. For example, Samsung started using the Picture Quality Index instead of the Clear motion rate (CMR). LG initially used the Motion Clarity Index (MCI), which Tru Motion later replaced.

Let’s look at index action scenes and how they technically work on a TV. This description applies to any TV.

What does the dynamic scene index mean in TVs

As TV manufacturers told us in 2011-2015. Our TV has the technology to improve picture quality in dynamic scenes. The TV creates intermediate frames between the existing image frames, increasing the number of frames. Due to this, the image on the TV screen will look smoother. The higher the index, the better the quality of TV image processing. No one knows how to calculate the index itself; it just is.

But as it turned out, TV sets do not create intermediate images; they do not have this technical possibility, insufficient CPU resources, and memory.

As told by TV manufacturers about the dynamic scene index after 2015. Thanks to the built-in software, the original image, which has a low frame rate, can be shown at an increased frequency for this use of duplicate frames and the insertion of a black frame. Visually, you can see an image commensurate with an image with a higher frame rate.

How this can be told for understanding. If the original image has a lower frame rate than the TV can show, for example, the TV can show 60 frames per second, but the image sent to the TV has a frame rate of 30. In this case, the dynamic scene enhancement mode works as follows. The frames begin to overlap, and the TV shows 60 frames instead of the original 30. If the TV has a display that supports 120 frames per second, extra black frames are inserted between frames to make the picture clearer.

If the TV gets the original quality video with a sufficient frame rate, these technologies are useless and do not work.

Disadvantages of all technologies that improve dynamic content

The most significant disadvantage is getting a soap opera effect. This is when the image becomes unnaturally smooth due to double frames. Alas, you can not do anything with this; if you want to get a normal video, watch it in the original, turn on the improvement program, and get a soap opera.

Indexes of dynamic scenes these days

Now almost ceased to use different indexes. The U.S. last used indices in 2017, but Europe almost stopped using them in 2021. They are outdated and do not reflect any clear parameters. Considering the increase in content with initially high image parameters, such as frame rate, makes programs to improve the quality of dynamic scenes simply unnecessary.

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