Mon, Apr 24, 2017 | updated 06:57 AM IST

Innovative way to restrict illegal replication of digital media

Updated: Nov 25, 2016 16:31 IST      
Innovative way to restrict illegal replication of digital media

WashingtonD.C [US], Nov. 25 (ANI): As per a recent study, scientists have developed a new light-based technique which will make it more practical to create secure, invisible watermarks that can be used to detect and prosecute counterfeiting.

The research has been published in Optics Express journal.

"In our research, we use a complex pattern of light, or diffraction pattern, as a unique watermark," said Yishi Shi, lead author of the study.

Adding, "The invisible watermark is embedded into the content we are trying to protect. Imperceptibility is one of the most significant advantages of optical watermarking."

The researchers report a new approach that encodes the optical watermark in a single step.

This new technique is faster and uses a less complex optical setup than other optical watermarking approaches previously pursued.

The new technique can also be used to optically encrypt data or to hide information within images.

The method is based on a technique called single-shot ptychography encoding (SPE) that uses multiple partially-overlapping beams of light to generate a diffraction pattern from a complex object.

Unlike other methods, SPE can encode the optical watermark in a single exposure with no mechanical scanning.

SPE is also less prone to error than other methods and uses a simpler optical setup.

In addition to conducting numerical simulations to test their method, the researchers carried out an optical experiment showing the usefulness of SPE.

"Most methods for optical watermarking have only been demonstrated with simulations. Our experiment shows that our method is suitable for practical optical watermarking," Shi said.

For the optical experiment, the researchers used SPE to create a complex watermark consisting of a diffraction pattern of multiple tiny spots.

Prior to embedding the watermark into a host image, they used computer processing to remove any repeated data and to scramble the diffraction pattern, making it easier to embed the watermark and further improving its security.

The spot size can be reduced to smaller than 10 microns, which helps prevent degradation of the host image.

Once a watermark is embedded into digital media, there are multiple ways to detect it to check for authenticity.

If someone knows an optical watermark is present, it can be detected by subtracting the host image from the watermarked image and then using a special security key and extraction algorithm.

For cases where the presence of a watermark is unknown, the watermark could be extracted using existing algorithm-based detection methods.

The researchers are now working to apply SPE to dynamic watermarking, which creates watermarks from objects that change quickly.

For example, the variations that occur within a biological cell could be recorded and used to create a special watermark.

They also plan to use SPE for multi-image watermarking and even 3D watermarking, while also working to further enhance the imaging quality of single-shot ptychography. (ANI)

Washington D.C. [USA], April 23 (ANI): For clean and safe environment, start placing bins at a distance of 1.5 metres away from suite doors as a study reveals that it can drastically boost recycling and composting rates by 141 percent.

Full Story >>

Hitting the gym? Take your friend along

Updated: Apr 23, 2017 18:25 IST

London [UK], Apr 23 (ANI): Believe it or not, exercising with a friend is anyday more productive than working out alone.

Full Story >>

London [UK], Apr 23 (ANI): Living in a fast paced environment can leave us stressed.

Full Story >>

Not male, VIP's now demand female bodyguards

Updated: Apr 23, 2017 17:40 IST

London [UK], Apr 23 (ANI): The trend's changing. While earlier you would imagine a tall, big man with biceps as someone's bodyguard, people these days are hiring women (average-sized women too) for their protection.

Full Story >>

London [UK], Apr 23 (ANI): In stark contrast to the generation before them, young adults are turning away from marriage and children so as to pursue education and career.

Full Story >>

Here's why you should stop drinking diet sodas

Updated: Apr 23, 2017 14:26 IST

Atlanta [US], Apr 23 (ANI): Rise in temperature is directly proportional to the increased intake of artificially sweetened drinks.

Full Story >>

What! This animal can survive without oxygen

Updated: Apr 23, 2017 14:00 IST

Atlanta [US], Apr 23 (ANI): The naked mole rat, one of the world's most bizarre and remarkable animals is surprising scientists once again.

Full Story >>

Tuns out, craving junk food is in your genes!

Updated: Apr 23, 2017 13:36 IST

Washington D.C. [USA], Apr 23 (ANI): If you are a slave to junk food and facing a seemingly endless struggle to curb your cravings, then good news as according to a recent study, you might be able to blame it on your genes.

Full Story >>

Washington D.C. [USA], Apr 23 (ANI): Winding back the clock has never been so delicious! A team of researchers has found that dark chocolates can reverse ageing.

Full Story >>

By Pallavi Aman Singh

Full Story >>

Find out what's new in Dubai!

Updated: Apr 22, 2017 15:03 IST

New Delhi [India], Apr. 22 (ANI): Dubai truly never stands still!

Full Story >>

Playfully scented love, now in your pocket!

Updated: Apr 22, 2017 14:53 IST

New Delhi [India], Apr. 22 (ANI): Looks like the sweating summer, this year, will remain stink-free, courtesy the perfumes in your pockets.

Full Story >>

Insta-gyaan to communicate better!

Updated: Apr 22, 2017 14:46 IST

New Delhi [India], Apr. 22 (ANI): When the 'virtual' world has turned the new 'reality,' Instagram has come up with a guide for the Indian community to make the connection better.

Full Story >>

Washington D.C. [USA], April 22 (ANI): A team of researchers has found that the patients with hyperpigmentation, a medical disorder that leads to darkening or increase in the natural color of the skin, are likelier to use sunscreen but not follow other sun protection measures like reapplying sunscreen after every two hours.

Full Story >>

This Summer, put the right foot forward

Updated: Apr 22, 2017 14:32 IST

New Delhi [India], Apr. 22 (ANI): Summer is here and with it, we have sun tan and sun burns too.

Full Story >>

Eat-n- Drink your way to a hydrated summer

Updated: Apr 22, 2017 14:31 IST

New Delhi [India], Apr. 22 (ANI): With heat and sweat, Summer brings some refreshing foods and drinks.

Full Story >>

Meditation, yoga work better for women: Study

Updated: Apr 22, 2017 13:25 IST

London [UK], April 22 (ANI): A team of American researchers have found that practicing mindfulness - meditation and yoga - benefits women more than men.

Full Story >>

Hence proved! Women are the better bosses

Updated: Apr 22, 2017 12:06 IST

London [UK], April 22 (ANI): In the battle of sexes as to who could be the better boss, here is another reason for women to rejoice!

Full Story >>

Skinny women are more likely to be depressed!

Updated: Apr 22, 2017 10:10 IST

London [UK], April 22 (ANI): Skinny jeans or small sized clothes may fit the thin women well, but when it comes to mental health, things may not be the same for them.

Full Story >>

London [U.K.], Apr 22 (ANI): If you are of the opinion that, when it comes to dating, you can attract partners by your wit, inherent charm, warmth and creativity as much as your physical appearance, you can pat yourself at your back, but only if you're a man.

Full Story >>