iCandy: July 2010

IEEE Spectrum's monthly slideshow proves that an image is worth a thousand bytes

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Photo: Imaginechina/AP Photo
This robot is flexing its circuits and servomotors in pursuit of gold at the first International Humanoid Robot Olympic Games held in Harbin City, China, in June. Along with weightlifting, automatons competed in 24 events, including track and field, dancing, and medical care.
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From WinZips to Cat GIFs, Jacob Ziv’s Algorithms Have Powered Decades of Compression

The lossless-compression pioneer received the 2021 IEEE Medal of Honor

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Photo of Jacob Ziv
Photo: Rami Shlush
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Lossless data compression seems a bit like a magic trick. Its cousin, lossy compression, is easier to comprehend. Lossy algorithms are used to get music into the popular MP3 format and turn a digital image into a standard JPEG file. They do this by selectively removing bits, taking what scientists know about the way we see and hear to determine which bits we'd least miss. But no one can make the case that the resulting file is a perfect replica of the original.

Not so with lossless data compression. Bits do disappear, making the data file dramatically smaller and thus easier to store and transmit. The important difference is that the bits reappear on command. It's as if the bits are rabbits in a magician's act, disappearing and then reappearing from inside a hat at the wave of a wand.

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