In addition, when the background is a stripe pattern with little color difference from the scanning technical file

How to quickly scan books and generate PDFS with mobile applications?

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

I need to scan a book of about 200 pages to make a PDF document. circuit printing service Can I do this for free?

I'm proud to say yes. The [Scan] function is completely free, PCB fabrication company and the [Generate PDF] function is free to use every day. Even if it is used up today, the number of times can be automatically refreshed the next day.

But given that the algorithms used to scan books are more complex, china PCB the scanning process will be more complex than a single scan. So everyone has prepared this article, a simple demonstration of how to quickly scan books through mobile phones.

Step 1: Open the scan-scan-surface book.

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

Step 3: The software will automatically generate four edges at the top and bottom of the page-click to adjust the edges.

Step 4: Done, continue scanning the next page!

Then generate pdf files or text recognition as needed.

Character recognition

Generate PDF

However, while the application will do most of the work for us, there are a few caveats that we need to be aware of. Pay attention to these key points, you can quickly and well sweep the book.

The distance between the mobile phone camera and scanning technical documents is moderate.

The camera was too far away from the book to identify which page it was scanning. The camera was so close that the edge of the book wasn't on the screen, so it was natural not to recognize it. Here are two examples of errors.

Left: The camera is too close to the book. Panic: The camera is too close to the book.

Contrast the scanned file with the background color.

The software will recognize the contour according to the color difference. If the colors are too close, the contour recognition will be wrong. For example, in the figure below, Agee uses a very exaggerated state to demonstrate that the software may default to the white paper range as the outline of the scanned document.

In addition, when the background is a stripe pattern with little color difference from the scanning technical file, the same situation may also occur, which is something we can avoid in advance.

Try not to put anything in the scanning area.

In addition to the contrast between the scan file and the background color, try to keep the scan interface as clean as possible. Here's an over-the-top demo by Agy that could be confusing. Oh, are you scanning a book, a headphone box, or a piece of A4 paper?

Master the above operation skills and pay attention to three tips, and you can quickly scan a good book with your mobile phone!