With mobile applications, how can I quickly scan books and generate PDFs?

A friend sent me a private message a few days ago:

Can you scan a book of about 200 pages for me for free?

Yes, the [Scan] and [Generate PDF] functions are free every day. merge multiple photos into one pdf Even if you use them all today, the number is automatically refreshed tomorrow.

Fortunately, everyone has prepared this article, a simple demonstration of how to quickly scan books using a mobile phone, since the algorithms used to scan books are more complex.

The first step is to open the scan-scan-surface book.

Step 2: The software will automatically recognize the left and right profile pages - click the button to take a picture

The software will automatically generate four edges at the top and bottom of the page. Click the edges to adjust them.

Continue scanning the next page!

If necessary, generate pdf files or perform text recognition.

Recognizing characters

Create a PDF file

Even though the application will do most of the work for us, there are a few caveats you should be aware of. By paying attention to these key points, you can sweep the book quickly and easily.

The distance between the mobile phone camera and the scanner is moderate.

Here are two examples of errors caused by the camera being too far away from the book to tell which page was being scanned. The camera was so close to the book that the edge of the book was not visible on screen, so it was a natural mistake not to recognize the page.

The camera is too close to the book on the left. Panic: The camera is too close to the book on the right.

The scanned file should be contrasted with the background color.

Based on the color difference, the software recognizes the contours. If the colors are too close, the contour recognition will be incorrect. To demonstrate that the software may default to the white paper range when scanning a document, Agee uses an exaggerated state in the figure below.

Similarly, when the background is a stripe pattern with little color difference from the scanning technical file, the same situation may occur, which can be avoided in advance.

Don't put anything in the scanning area.

Try to keep the scan interface as clean as possible. Here's an over-the-top demo by Agy. Oh, are you scanning a book, a headphone box, or a piece of A4 paper?

Using your mobile phone to scan a good book is easy if you master the above skills and pay attention to three tips!