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9 seconds |
11 seconds |
14 seconds |
20 seconds |
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45 seconds |
2 min. 21 sec. |
8 min. 44 sec. |
14 min. 34 sec. |
The Progressive Image Transmission (PIT) system delivers large digital images over slow networks in a small fraction of the time usually needed. Viewers get a good view in as little as 1/100th of the expected download time, at which point they can interact with the server by outlining rectangular regions of interest, which will be delivered losslessly at a higher priority. The user controls the lossiness of the image, which is not chosen in advance by the server.
PIT supports 24-bit true-color images as well as 16-bit gray-scale data. The algorithms used are quantitatively well behaved; the pixel statistics are preserved even for the early versions of the image. This provides good visual fidelity for general users and good numerical fidelity for professional users.
