Xiaomi smartphone owners often face the need to quickly transfer a paper document to the digital space, and built-in image processing algorithms allow you to turn a regular camera into a powerful scanner that can recognize even small print.
Modern MIUI and HyperOS firmware offer a variety of text-based tools, and fine-tuning exposure and focus helps avoid blurring and glare, which is critical for further character recognition.
In this article, we will discuss all the subtleties of shooting documents, books and manuscripts on Xiaomi devices, you will learn what modes to use for maximum clarity and how to fix recognition errors.
Preparation of the camera and workspace
The quality of the final image is directly dependent on the shooting conditions, and insufficient lighting leads to digital noise that prevents OCR (optical character recognition) algorithms from correctly interpreting letters.
Use natural light or a powerful desk lamp, placing the light source on the side of the document, this will avoid glare on glossy paper and ensure uniform illumination of the entire frame area.
Be sure to wipe the camera lens with a soft cloth before starting work, even microscopic fatty marks can create a soapy image effect, which will cause small details of the text to merge into indistinct spots.
⚠️ Note: Do not use the built-in flash when shooting glossy magazines or laminated documents - this will create a light in the center of the frame, making the text unreadable.
Stabilizing your smartphone is also key: Put your elbows on the table or use a tripod to prevent microlubrication of the image when you press the down button.
Use of the built-in "Documents" mode
In the standard Xiaomi camera app, there is a specialized mode that is sharpened for working with papers, which automatically determines the boundaries of the sheet and aligns the perspective, removing the distortion of angles.
To activate this feature, open the Camera app and select "More" from the top menu. In the mode list, look for the Documents or Scanner icon.
Once you've turned on the mode, point the lens over a piece of paper, and the system automatically highlights the outlines of the document with a yellow frame, and if the frame appears, you can take a picture, and the alignment will happen automatically.
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For quick access to scan mode, add the Scanner widget to the home screen or to the notification curtain through the MIUI widget editor.
In the mode settings, you can choose the document type: "Text", "Photo" or "ID card." For ordinary pages of books, the best option is the "Text" option, which increases contrast and makes the background white.
Manual setting through PRO mode
Sometimes automation can't handle the complex lighting conditions or the specific color of the paper, and in these cases, the professional PRO mode comes to the rescue, allowing you to manually control the sensor parameters.
Switch to PRO mode and pay attention to the following parameters:
- 📷 ISO: set a minimum value (usually 50 or 100) to reduce noise.
- ⏱ Shutter speed (S): adjust exposure time to make the text brighter but not clearer.
- 🔍 MF (Manual Focus: Slider sharpen strictly on the surface of the paper.
- ⚖️ WB (White balance: adjust the temperature so that the white sheet does not give off yellow or blue.
The use of manual focus is especially important when shooting pages of curved books. Automatic focus can walk between lines, while fixing MF will allow you to clearly highlight the desired area.
Once you have set the settings, take a test shot and rate the result in the gallery. If necessary, adjust the shutter speed or white balance to achieve the perfect black and white contrast.
Application of artificial intelligence AI
Modern Xiaomi smartphones are equipped with an AI Camera module that analyzes the scene in real time, when getting stuck over the text on the screen appears icon "Text" or "Document".
Activation. AI-The script automatically uses black sharpening and saturation filters, which is especially useful for faded checks, old newspapers or low contrast photos.
But be careful: Aggressive algorithmic processing can sometimes distort handwritten text or make thin lines too bold.
⚠️ Note: If you are photographing text for editing, disable beautify effects and filters that can change the geometry of letters.
To enable the function, go to the camera settings and make sure the "AI" switch is active, and you can also select the degree of influence of intelligent algorithms on the final image from the settings menu.
Third-party scanning applications
The hardware is good, but specialized software often offers more advanced recognition features, and applications like Google Lens, Adobe Scan, or CamScanner integrate deeper into the image processing system.
Google Lens, built into Google Assistant, allows you to not just take a picture, but immediately copy the text to the clipboard or translate it, which saves time when working with foreign documents.
Third-party scanners can automatically remove shadows from fingers, align pages around the edges and collect multi-page documents in one PDF-minimal-size.
| Annex | Recognition (OCR) | PDF export | Removal of glare |
|---|---|---|---|
| Xiaomi camera | Basic | There is. | Partially. |
| Google Lens | High. | No (text only) | No. |
| Adobe Scan | Professional | There is. | Yes. |
| Microsoft Lens | High. | There is. | Yes. |
The choice of application depends on your tasks: for quick copying of a couple of lines there will be enough built-in tools, and for archiving contracts it is better to use specialized software.
Text processing and recognition after shooting
Once a photo is taken, it is often necessary to convert the image into editable text, and in MIUI, this feature is built right into the gallery.
Open the image taken in the Gallery app. Press the "More" button (three dots) and select the "Recognize text" or "Remove text" option. The system will analyze the image and highlight the characters found.
You can copy the entire text or select individual fragments, and you can also use the translation or search feature in the browser.
What to do if the text is recognized with errors?
For batch processing of large volume of documents, it is more convenient to use cloud services such as Google Drive or Yandex.Disk, which have built-in OCR functions when downloading images.
Frequent errors and ways to fix them
Even experienced users make mistakes that reduce the quality of the scan, and one of the most common is shooting at an acute angle without using perspective correction mode.
As a result, the text is trapezoidal, and the lines at the bottom of the page become indistinct. Always try to hold the smartphone parallel to the plane of the sheet.
Another mistake is using digital zoom, and finger zooming, which is a pinch, lowers the resolution and adds compression artifacts, and you'd better get closer or use the optical zoom of the telephoto lens, if you have one in your model.
☑️ Checklist of the perfect scan
If you see fingers holding your phone, use a timer or voice control to free your hands and allow you to lock your device more firmly.
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The main secret of a quality scan on Xiaomi is good lighting and the use of the Documents mode to automatically level the boundaries.