Qr codes web
- 1. QR Codes PRESENTED BY : SIMRAN GUPTA GUIDED BY: MR. DISHANT AGRAWAL MS. SONIKA GUPTA
- 2. A QR code consists of black modules arranged in a square grid on a white background, which can be readable by an imaging device. A QR Code is a two-dimensional barcode that is readable by smart-phones or other handheld devices. WHAT IS A QR CODE?
- 3. BAR CODE VS QR CODE
- 4. HISTORY Created by Toyota subsidiary Denso-Wave in 1994. First used for tracking parts during vehicle manufacture.
- 5. STRUCTURE OF QR CODE VERSION 2 1. Finder Pattern 2. Separators 3. Timing Pattern 4. Alignment Patterns 5. Format Information 6. Data 7. Error Correction 8. Remainder Bits
- 6. 1. Finder Patterns : It enable the decoder software to recognize the QR Code and determine the correct orientation. 2. Separators : It improve the recognizability of the Finder Patters as they separate them from the actual data. 3. Timing Pattern : Alternating black and white modules in the Timing Pattern enable the decoder software to determine the width of a single module. 4. Alignment Patterns: It support the decoder software in compensating for moderate image distortions.
- 7. 5. Format Information: It consists of 15 bits next to the separators and stores information about the error correction level of the QR Code and the chosen masking pattern. 6. Data : Data (bit stream) stored in 8 bit parts. 7. Error Correction : error correction codes are stored in 8 bit long code words. 8. Remainder Bits : It consists of empty bits if data and error correction bits can not be divided into 8 bit code words without remainder.
- 8. How to Create QR Codes
- 9. How to Read a QR Code • Mobile device must have a camera. • Start the QR reader application. • Point the camera at the code ( orient code within designated area ).
- 10. Text
- 11. SOME QR SCAN RESULTS
- 12. URL of my website
- 13. Phone Number
- 14. Email Address
- 15. V-Card
- 16. Uses and Applications QR Codes may be used to display: Text URL(most common) Contact information Email V-Card Convenience-oriented applications ,etc.
- 17. Storage
- 18. Error Correction Level L (Low) : 7% of codewords can be restored. Level M (Medium): 15% of codewords can be restored. Level Q (Quartile) : 25% of codewords can be restored. Level H (High) : 30% of codewords can be restored. Codewords are 8 bits long and use the Reed–Solomon error correction algorithm with four error correction levels. The higher the error correction level, the lesser storage capacity.
- 19. Encoding • The format information records two things: -the error correction level -the mask pattern used for the symbol • Masking is used to break up patterns in the data area that might confuse a scanner, such as large blank areas or misleading features that look like the locator marks. The mask patterns are defined on a grid that is repeated as necessary to cover the whole symbol. Modules corresponding to the dark areas of the mask are inverted.
- 20. •The format information is protected from errors with a BCH code. •Two complete copies are included in each QR symbol. The message dataset is placed from right to left in a zigzag pattern, as shown below. Fig: Meaning of format information
- 21. Advantages of QR code • QR Codes are beneficial for both customers and businesses. For example, a business saves money and advertising costs by distributing a QR code to their website or URL. A customer can scan this QR code and this allows them to store the information for future reference. • Huge storage capacity.
- 22. Disadvantages of QR code • Lack of familiarity of the QR code among people. • Dependability on a mobile device or smart-phone.
- 23. Examples
- 24. Object hyperlinking Object hyperlinking aims to extend the Internet to the real world by attaching tags with URLs to tangible objects or locations. These tags can then be read by a wireless mobile device and information about objects and locations retrieved and displayed.
- 25. “Finally, the greatest importance of QR codes could lie not in their specific use, which may be superseded by newer codes and interpreters, but in the opportunities they offer for moving away from keyboards as input devices in learning environments.” Conclusion
- 26. References
Editor's Notes
- #9: Many QR code generator sites on the web… they are free to use.
- #14: –need a phone for this… not ipod touch
- #20: I don’t think I really have to emphasize how important it is to test your codes. Does your code do everything it’s supposed to? If not, check your reader….. Is it appropriate for your device, specifically the version, OS model of your device?
- #25: So what is really going on in the previous real world examples is - object hyperlinking.