Creating professional video content today is possible right in your pocket. The question how to make a background on a video on an Android phonebecomes relevant for bloggers, students and those who hold online meetings. Mobile technologies have stepped far forward, and now you don’t need a studio with a green screen or a powerful computer to replace the background.
Modern artificial intelligence algorithms allow AI to segment the image in real time, separating a person from the environment with amazing accuracy. You can transform a boring wall in your room into a dynamic cityscape or blur the background to focus the viewer's attention on you. This process has become accessible thanks to specialized applications and built-in functions of new smartphones.
In this article we will examine in detail various methods of changing the background: from automatic replacement in video calls to post-processing in editing apps. We'll look at the tools that will help you look professional, no matter where you are.
Use the built-in camera and video calling features
Many users are unaware that their smartphone is already equipped with the necessary tools. Manufacturers of flagship devices, such as Samsung in the series Galaxy S or Xiaomi in the line Mi, are implementing background blur and image replacement functionality directly into the camera app. Typically, this option is activated before starting recording or during a video call through the settings menu.
To activate, you need to open the camera application, switch to video mode and look for an icon that resembles a silhouette of a person or a blurry circle. Clicking on it opens the effects menu, where you can select the degree of blur (Blur) or upload your own image. The quality of the algorithm’s work directly depends on processor and the presence of a dedicated module NPU in your device.
However, it is worth considering the limitations. Built-in functions often only work in native applications or instant messengers optimized for a specific phone model. If you are using third-party conferencing software, system background replacement may not be available without obtaining root access, which is not recommended for general users for security reasons.
Before recording a video with background replacement, make sure that the lighting in the room is even. Sharp shadows can throw off the silhouette recognition algorithm, and the background will begin to “flicker.”
⚠️ Attention: The real-time background replacement feature significantly increases the load on the battery and can cause overheating of the body during long-term recording in high resolution.
Applications for real-time background replacement
If your smartphone does not support native background replacement, third-party solutions come to the rescue. The leader in this niche is an application Chroma Camera or specialized launchers for video calls. These apps create a virtual layer on top of the camera image, replacing the background on the fly before transferring the data to the messenger.
The operating principle of such utilities is often based on technology chromakey or advanced AI segmentation. In the first case, you will need a physical green screen, which guarantees perfect cutting quality. In the second case, the application itself analyzes the frame, but the result may be less stable in difficult lighting or colorful clothing.
The setup process usually looks like this: you launch the camera application, select the desired background from the gallery or effects library, and then select this application as the video source in Zoom, Skype or Google Meet. It is important to give the app all the necessary permissions to access the camera and microphone in the settings Settings → Applications.
Video post-processing in mobile video editors
The highest quality results are achieved during post-processing. Editing apps like CapCut, KineMaster or InShotoffer powerful tools for working with backgrounds after recording. This method takes more time, but allows you to achieve a cinematic effect and correct mistakes made during shooting.
In modern editors, the background removal function is often called "Chroma Key" or "Cutout". If you shot on a plain background, the tool will remove it with one click. If the background was ordinary, advanced algorithms Auto Cutout will try to select the object automatically. Accuracy depends on the contrast between the subject and the background.
For best results, follow these recommendations:
- 🎥 Shoot video in the highest available resolution to make it easier for the algorithm to distinguish details.
- 💡 Use contrasting clothing that does not blend into the intended new background.
- 📱 Mount the phone on a tripod to eliminate shaking, which complicates object tracking.
- 🖌️ Manually modify the mask in the editor if the automation missed sections of hair or clothes.
☑️ Preparation for editing with replacing the background
Chroma key technology: a professional approach on a smartphone
Despite development neural networks, the classic green screen remains the gold standard for video production. On Android, this method is the easiest to implement and gives a predictable result. You will need fabric or paper of a bright green color, which is not found in your clothes and accessories.
In video editors, the process of setting up chromakey requires precision. You need to use the eyedropper to select the shade of green, and then adjust the Intensity (intensity) and Shadow (shadow) parameters. Incorrect settings can lead to the appearance of a green halo around the figure or to “holes” in the image.
There is a table of popular applications and their support for background functions:
| Application | Replacement type | Complexity | Quality |
|---|---|---|---|
| CapCut | AI / Chroma Key | Low | High |
| KineMaster | Chroma Key | Medium | Professional |
| YouCam Video | AI in real time | Low | Medium |
| PowerDirector | Chroma key / Masks | High | High |
⚠️ Attention: When using a green screen, avoid wearing green, lime or turquoise colors, otherwise these parts of the body will become transparent in the final video.
Setting background blur (Bokeh) for portrait video
Sometimes a complete replacement of the background is not required, and it is enough to simply separate the object from the background using blur. This effect, known as bokeh, gives the video volume and artistic expression. On Android, this is implemented through the “Portrait” mode in video shooting or through blur plugins in editors.
Hardware blur depends on the number of cameras and their characteristics. Smartphones with a telephoto lens and a depth sensor ToF build a scene depth map more accurately. Software blur, applied after shooting, allows you to adjust the strength of the effect with a slider, giving you flexibility in the creative process.
If you use an editor to add blur, a layering technique is often used. You copy the video track, apply the effect Gaussian Blur (Gaussian blur) to the bottom layer, and clear the background from the top layer using a mask. This allows you to control the degree of blur regardless of the clarity of the object.
Why does blur sometimes look unnatural?
Algorithms can make mistakes at the boundaries of contrasting objects or during fast movement. Hair and transparent objects (glasses, veil) are often blurred along with the background, creating the effect of a “cut off head.”
Common problems and ways to solve them
When working with background replacement, users often encounter artifacts. The most common problem is “jelly,” or jittering of the edges of an object. This occurs due to insufficient processing power of the processor or low quality of the source video. The solution is to lower the recording resolution or use a more powerful device.
Another difficulty is the incorrect determination of boundaries in poor lighting. Shadows falling on chromakey can be perceived by the app as part of the object. In such cases, it is necessary to reshoot the scene with brighter and more uniform light, directed separately at the background and at the person.
It is also worth remembering the compatibility of formats. Some heavy effects may not display correctly when exported to social networks that compress the video. It is recommended to check the final file on different devices before publishing.
⚠️ Attention: Application interfaces and function names may differ depending on the Android version and the manufacturer's shell (MIUI, OneUI, ColorOS). Always check the current menus in your device.
The quality of background replacement depends 80% on the lighting and contrast of the scene, and only 20% on the capabilities of the application. Even the most expensive software will not save you from bad light.
FAQ: Frequently Asked Questions
Is it possible to change the background during a video call in WhatsApp on Android?
At the moment, WhatsApp on Android does not have a built-in function for changing the background during calls, unlike some versions for iOS or desktop applications. You will need to use third-party camera applications that intercept the video stream, but this is unstable and depends on the phone model.
Which phone is best for replacing the background?
The best results are shown by flagships with powerful processors and dedicated AI units, such as Samsung Galaxy S23/S24 Ultra, Google Pixel 7/8 or Xiaomi 13/14 Pro. They do the best job of isolating complex objects, such as hair, in real time.
Is a green screen necessary for a high-quality replacement?
No, modern ones AI algorithms allow you to cut out an object without a green background using segmentation technology. However, a green screen gives a cleaner and more professional result, especially if the object has a complex shape or is moving quickly.
Why does the background flicker when moving?
Flickering occurs due to the fact that the algorithm does not have time to recalculate the mask frame by frame or makes an error in determining the boundaries due to similarity of colors of clothing and background. Try reducing the speed of movement or improving the lighting.
Are background replacement apps free?
Most popular apps (CapCut, YouCam) operate on a Freemium model: basic functions are free, but advanced effects, high-resolution exports or watermark removal require a paid subscription.