This is a continuation of my blog post on intro to digital watermarking. In that post, we discussed what digital watermarking is and how it can be achieved. Here, we will discuss the intuition behind image watermarking and a few techniques that can be used. If you look at enough number of images, you will … Continue reading The Intuition Behind Image Watermarking
Tag: Pixel
Digital Watermarking
Let's say you want to verify the authenticity of a signal. The signal can take any form like an image, audio, video, or any other kind of bit stream. By now, everybody would have heard the term "watermark" being used in the general sense. The most common example would be currency notes. Watermarks are embedded … Continue reading Digital Watermarking
Image Steganography
As discussed in my previous post, steganography is the art of hiding the fact that communication is taking place. We achieve this by hiding original information inside other information known as carrier files. Many different carrier file formats can be used, but digital images are the most popular because of their frequency of occurrence on … Continue reading Image Steganography
Panoramic Images
Consider a situation where you are standing on top of a mountain or some other beautiful natural scenery. You are enjoying a beautiful view that seems to span from far left to far right and you want to take a nice picture of the whole thing. Your camera allows you to capture only a limited … Continue reading Panoramic Images
Fingerprint Recognition
Fingerprint recognition was one of the first forms of biometric authentication techniques developed. Biometric authentication refers to the process of identifying humans by their natural traits. This can include fingerprints, face, voice, iris etc. When you want machines to authenticate a particular person, you choose a feature of that person which he cannot control. Fingerprints … Continue reading Fingerprint Recognition
Touch Me Not
We are increasingly moving towards touchscreen technology. Every new mobile gadget that's coming to the market has a touchscreen. Most of us interact with touchscreen technology on a daily basis. I'm sure you would have gotten curious some time or the other to know how it actually works. What happens when you touch the screen? … Continue reading Touch Me Not
Understanding Camera Resolution
Cameras are being embedded everywhere. We find them on our phones, tablets, laptops and other types of gadgets as well. Digital cameras are getting sharper and smarter by the day. Some cameras capture good quality pictures while some cameras don't. We frequently come across the camera specs which mention the 'MP' value of the camera. You understand … Continue reading Understanding Camera Resolution
Perpetual Enigma 