An amusing Japanese cartoon on combinatorial explosion:
Tastefully done, I would say. The target audience consists not of this blog’s readers, but rather of their children.
Hat tip: Michael Lugo
Some time ago I read an article on a forward operating base (FOB) of the U.S. Marines somewhere in Afghanistan. Because of the threat of rocket attacks, the Marines on that FOB practice strict “light discipline” at night: there are shutters on the windows, no white lights are allowed, and people move around using small red-lensed flashlights.
This reminded me of when I was a kid and watched those Vietnam War movies in which U.S. infantry soldiers used flashlights that looked like this:
The intriguing thing is that the soldiers used red filters on their flashlights. “Why red?”, I wondered back then. Well, 15 or 16 years later, I still don’t know the reason.
Now that I am a bit more educated, I can think of two possible reasons why red flashlights may be a good idea:
Therefore, I suppose that red flashlights are a good idea for both physical and physiological reasons. I searched for some material on this on the internet, and I found some stuff (like this discussion), but nothing very scientific.
Can anyone come up with a reasonable scientific explanation why the military uses flashlights with red filters? I have been waiting for a good answer for almost two decades, and your input will be appreciated.
I doubt there’s one single book on Digital Image Processing that does not contain this image. The Lena photo can be found on countless scientific papers. Numerous algorithms have been tested using her photo. Lena is definitely a celebrity in the Image Processing community.
But, who is the mysterious Lena after all?!? She’s Lena Söderberg (b. 1951), a Swedish model who is also known by her maiden name Lena Sjööblom / Lenna Sjööblom. She appeared in the centerfold of the November 1972 issue of the Playboy magazine. In mid-1973, engineers at the Signal & Image Processing Institute (SIPI) were searching for good test images. Someone found a copy of the November 1972 issue of the Playboy magazine, and the engineers scanned the centerfold photo of Lena. Over the past decades, the Lena image has been the de facto standard for testing Image Processing algorithms. The mysterious Lena is considered the “First Lady of the Internet”, and an “Information Age Madonna”. Apart from Mona Lisa, no image has been studied harder.
In 1988, Lena Söderberg was pleasantly amused to find out what had happened to her picture. In 1997, she was a guest at the 50th annual Conference of the Society for Imaging Science and Technology, where she was busy signing autographs, posing for pictures, and giving a presentation about herself.
I am sure all of you have encountered CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) tests before. CAPTCHA tests are generated by computers, but only humans should be able to solve them. Hence, one can tell human users from computers.