Application of Barcode Technology and Digital Watermarking Technology in Anti-Counterfeiting [Buk Printing]

Application of Barcode Technology and Digital Watermarking Technology in Anti-counterfeiting【Step Shell Printing】

(1) Provability and Security. Provability refers to the watermark's ability to provide complete and reliable evidence for the attribution of copyright-protected information products. Security means that the methods for embedding and detecting the watermark are absolutely confidential and not easily decipherable by unauthorized third parties (even if detected by hackers, it cannot be read). In other words, digital watermark information should be secure, difficult to tamper with or forge, thus requiring encryption.

(2) Imperceptibility, also known as concealment, means that the digital watermark should be imperceptible and should not affect the normal use of the protected data. Imperceptibility encompasses two aspects: first, visual imperceptibility, meaning the changes in the image caused by embedding the watermark are imperceptible to the observer's visual system, making it difficult for ordinary people to determine the location of the embedded watermark (ideally, the watermarked image is identical to the original). The presence of the watermark should not alter the visual quality of the original image or affect its visual effect. Second, the watermark cannot be recovered by statistical methods, meaning that using statistical methods on a large number of information products processed with the same method and watermark cannot extract the watermark or confirm its existence.

(3) Robustness. Also known as sturdiness, it means that after undergoing some common alterations, the watermark in the image remains highly detectable. It refers to the ability of the digital watermark to not be destroyed (still maintaining partial integrity and being accurately identifiable) after undergoing various unintentional (such as image compression, low-pass filtering, image enhancement, scanning and copying noise pollution, size changes, etc.) or intentional (such as malicious attacks, etc.) signal processing. Possible signal processing includes channel noise, filtering, digital-to-analog and analog/digital conversion, resampling, cropping, rotation, distortion, displacement, scaling, and lossy compression encoding, etc. Of course, different applications require different levels of robustness. It should be noted that there exists a watermark with opposite properties, called a fragile watermark, which can be used to achieve a different purpose compared to robust watermarks.

Application of Barcode Technology and Digital Watermarking Technology in Anti-counterfeiting【Step Shell Printing】