Their method is to scan every checked baggage with a bomb detector.
Their method is to scan every checked bag with a bomb? Detector.
Similar phrase: want to scan? Scanning; Scan it in Scan input; Scan code? N scan code; Skip the scan? Jump scanning; Spiral scan? Spiral scanning; Sector scanning? Sector search; Serial scanning? Continuous scanning.
2. QR code; In English; QR code; Dimension bar code; Two-dimensional barcode.
For example, at present, most of the QR codes used in China have only one algorithm, which has been copied and cracked.
Most QR codes in China have only one algorithm, which is easy to be copied. It's cracked
Extended data
Compared with traditional bar codes, two-dimensional codes can store more information and represent more data types.
The data symbol information is recorded by black and white graphics of specific geometric figures distributed on a plane (two-dimensional direction) according to certain rules.
The concept of 0, 1 bit stream, which constitutes the internal logic foundation of computer, is skillfully used in coding.
A number of geometric figures corresponding to binary are used to represent alphanumeric information, which is automatically read by image input equipment or photoelectric scanning equipment to realize automatic information processing.
Two-dimensional code has some characteristics of barcode technology: each code system has its own specific character set; Each character occupies a certain width; It has certain verification function.
At the same time, it also has the function of automatically identifying different line information and processing graphics rotation change points. ?
2065438+On August 3, 2006, the Payment and Clearing Association issued the Code for Barcode Payment Services to payment institutions, and the opinion draft clearly pointed out the security standards that payment institutions need to follow in developing barcode services.
This is the first time that the central bank officially recognized the status of QR code payment after 20 14 stopped QR code payment.
Function of QR code
1. information acquisition (business card, map, WIFI password, data).
2. Website jump (jump to Weibo, mobile website, website).
3. Advertisement push (users scan the code to directly browse the video and audio advertisements pushed by the merchants).
4. Mobile phone e-commerce (users scan the code, shop directly on mobile phones, and place orders).
5. Safety traceability (users can scan the code to see the origin; At the same time, the background can obtain the final consumption location).
6. Preferential promotion (users scan codes, download electronic coupons, and draw prizes).
7. Member management (get E-member information and VIP service on the user's mobile phone).
8. Mobile payment (scan the QR code of the goods and complete the payment through the mobile phone channel provided by the bank or the third party payment.
References:
Baidu encyclopedia-QR code