Modern Smart TV Chinese giant Xiaomi offers users a wide range of multimedia features, but the quality of the original video content often leaves much to be desired, especially when watching low-resolution or old-fashioned TV. DVD-And in these situations, we have an embedded image processing system called noise reduction that's designed to eliminate visual artifacts, making it smoother and more enjoyable.
Many owners of devices based on the Android TV operating system or proprietary PatchWall shell face incomprehensible settings in the image menu, without knowing their real purpose. The MI Noise Reduction algorithm in Xiaomi TVs analyzes neighboring pixels and frames, smoothing out sharp color transitions that the human eye perceives as “snow” or grain. Understanding the principles of this feature allows you to significantly improve the quality of viewing by adapting the image to a specific signal source.
In this article, we will discuss in detail what exactly lies behind the term “noise reduction” in the context of Mi TV and Redmi TV. You will learn how to properly configure this setting so as not to lose the detail of the image, and in which cases its use is really necessary, and when it is better to disable the function to preserve the original texture of the frame.
The principle of digital noise reduction
Digital Noise Reduction (DNR) is a complex software algorithm embedded in a TV's video processor. When a signal enters a device, the system analyzes the array of data of each frame. If the program detects single pixels whose color or brightness is sharply different from its surrounding neighbors, it classifies them as digital noise. Once the "problem" points are identified, the algorithm replaces their value with the averaged between neighboring elements, thereby smoothing the defect.
Xiaomi TVs often use a combined approach that includes both spatial and temporal processing. Spatial noise cancellation works within a single frame, comparing pixels horizontally and vertically. Temporary (or frame) noise cancellation compares the current frame with the previous and subsequent one. This allows you to more effectively deal with the dynamic noise that manifests itself in moving objects, but requires more processing power of the processor.
⚠️ Warning: Excessively increasing the noise reduction parameter can lead to a soap image effect, where fine details and textures disappear, and the movement of objects becomes unnatural.
It's worth noting that the algorithm's performance is directly dependent on the quality of the original signal. If you input a highly compressed video with a high compression level, the system can start to mistake noise for useful image details, such as fabric texture or small decor elements, so it's important to find a balance between the purity of the picture and the preservation of detail.
Types of noise and methods of their elimination
Video signals can contain different types of distortion, and Xiaomi’s MI Picture Engine system offers tools to combat them. The most common type is luma noise, which looks like a chaotic alternation of light and dark dots, resembling the graininess of film, a noise often produced when shooting in low light or when the antenna signal is amplified.
Another common problem is color noise (Chroma Noise), which manifests itself as colorful dots (red, green, blue) that do not correspond to the real color of the object. Color noise is especially noticeable on monochromatic surfaces, such as the sky or walls. TV algorithms separate the processing of brightness and color components, which allows you to work more delicately with each type of distortion.
- 📺 Compression artifacts: occur when a video stream is compressed strongly (for example, in low-bitrate online cinemas) and appear as squares or blurs in dynamic scenes.
- 📡 Analog interference: characteristic of terrestrial television and appear as "snow" or ripples, especially in low signal conditions.
- 🎮 Gradients: manifested in smooth color transitions (such as in the sky at sunset) and often mistaken by users for noise, although it requires a gamma adjustment.
To eliminate each type of interference, the TV menu has separate adjustable sliders. Some Redmi Smart TVs have automatic modes where the TV itself tries to determine the type of content and determine the optimal level of filtering. However, manual adjustment almost always gives a more predictable and qualitative result.
How to find and activate a function in the menu
The interface for setting up the image on Xiaomi TVs may vary depending on the operating system version (Android TV 9, 10, 11) and regional firmware. In most cases, the path to the desired settings is through the main menu. You need to click the Menu button on the remote control or select the gear icon in the upper corner of the screen.
Once you enter the settings, you should go to the image section, which can be called Image, Picture or Display, and within this section you should find the "Additional", "Advanced Settings" or "Professional Settings", which is where the parameters associated with video processing, including MPEG Noise Reduction and Digital Noise Reduction, are usually hidden.
☑️ Checking the image settings
In new PatchWall models, the interface can be slightly modified. Sometimes noise reduction is integrated into image modes. For example, in Movie or Standard mode, the noise reduction level is already preset by the factory. To change it, you often need to switch the image mode to Custom or Personalized, after which all the adjustment sliders become available.
If you can't find the settings, try resetting the image to factory values. Sometimes after updating the firmware, some parameters may stick or hide, and it's also worth checking whether the "Eco" or "Energy Saving" mode is enabled, since in these modes some image processing functions can be automatically disabled to reduce the load on the processor.
Set up parameters for different signal sources
There is no universal noise reduction setting, as the optimal level depends on the source of the video signal. For terrestrial digital television (DVB-T2), which is often broadcast at 720p or compressed to a minimum, more aggressive noise cancellation is required, in which case it is recommended to set the parameter value to the "Mediternary" or even "High" level to smooth out the compression artifacts.
When you view content in high resolution (Full HD, 4K) through embedded apps like Netflix, YouTube or Kinopoisk, that changes. Here, the original image quality is usually high, and turning on strong noise cancellation can only harm by blurring out the details. For such sources, Low mode or shutting down the feature completely to see the image as the director intended it.
| Signal source | Recommended DNR level | Recommended level of MPEG NR | Commentary |
|---|---|---|---|
| Television (antenna) | Medium/High | Medium. | Removes "snow" and compression squares |
| Cable/Satellite TV | Low/Mediocre | Low. | Depends on the quality of the provider |
| Online Cinemas (4K HDR) | Off. | Off. | Keeps maximum detail |
| Game consoles (PS5, Xbox) | Off. | Off. | Critical for reducing input delay |
| Old DVD/VHS | High-pitched | High-pitched | It is necessary to smooth out the grain |
Special attention should be paid to the use of Xiaomi TV in conjunction with game consoles. In game mode (Game Mode), the system automatically disables most post-processing effects, including noise cancellation, to minimize Input Lag (entry delay).
What is MPEG Noise Reduction?
Effects of noise reduction on productivity and delay
The processing of a video signal requires computational resources. When you activate noise reduction functions, the TV's video processor performs additional operations on each frame. This inevitably introduces a small delay between receiving the signal and displaying it on the matrix. For watching movies, this delay of a few milliseconds is completely invisible, but for gamers it can become critical.
In low-end models of Redmi or Mi TV Stick, where the cooling system can be passive or simplified, prolonged use of maximum noise reduction settings in combination with other effects (for example, dynamic contrast) can theoretically lead to trolling (decreased performance) or slowing the interface.
⚠️ Note: When connecting the PC to the TV through HDMI As a monitor, always turn off noise cancellation, otherwise the mouse cursor will move with a noticeable delay, and the text on the screen may become fuzzy (“floating»).
And it's also worth mentioning the impact on power consumption. Although the contribution of one algorithm is small, the integrated operation of all image enhancement systems increases the power consumption of the TV. If you want to maximize energy efficiency, turning off the extra signal processors is a smart move.
💡
Use Movie Mode or Filmmaker Mode to watch movies, and in these modes, the TV automatically turns off any unnecessary improvements and noise reduction, showing the picture according to the creators’ intent.
Comparison with competitors and features of MI UI
Xiaomi TVs’ noise-cancelling technologies are based on solutions from matrix manufacturers (most commonly BOE, CSOT or LG) and chipsets (mostly MediaTek or Amlogic). Compared to top-end models from Sony (X-Reality PRO) or Samsung (NQ processors), Xiaomi mass-market solutions work easier, effectively removing big noise, but may not be able to handle fine details in complex scenes, sometimes eating away at textures.
The MIUI for TV software shell features fine-tuning through hidden engineering menus or third-party apps, although standard tools give the user enough tools. Unlike some competitors, where settings are spread across different menus, Xiaomi tries to group image enhancement options in one place, which makes calibration easier.
- 🚀 Speed: Xiaomi algorithms work fast enough and rarely cause noticeable artifacts of plumes (ghosting) at an average level of customization.
- 🎨 Color Rendering: Aggressive noise cancellation can slightly desaturate colors, making them fainter, which is worth considering when setting up.
- ⚙️ Adaptability: New models are better at defining content type and automatically adjusting filtering levels than previous generations.
Users who require a professional level of image processing are advised not to rely solely on the TV's built-in algorithms. AV-Receivers with more powerful processors can take on the task of noise reduction and scaling, transmitting to the TV already ready, cleaned signal.
💡
Optimal noise reduction is always a trade-off between keeping the picture clean and keeping the detail natural. Don't try to remove all the noise completely if it turns the image into soap.