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If you take the fundamental concept behind run-length encoding, which is to find redundancies by identifying correlations in the data, and then apply more sophisticated pattern search algorithms and efficient symbol replacement (eg, replace a 10-byte pattern with an 8-bit symbol each time that pattern appears), you will have an even more effective version of lossless compression The PNG image format, which is primarily used for graphics on Bluray Discs, supports compression filters, which provide different search algorithms for identifying and reducing redundant patterns in the image data With these formats, even natural images can start to see at least some benefit (though it is still more effective for synthetic images where there tend to be more and larger repeating patterns) To reduce picture information even more, lossy compression is required This results in information being removed permanently The trick is to only remove detail that will not be noticed Many such compression techniques, known as psychovisual encoding systems, take advantage of a number of aspects of the human vision system j The eye is more sensitive to changes in brightness than changes in color j The eye is unable to perceive brightness levels above or below certain thresholds j The eye cannot distinguish minor changes in brightness or color This perception is not linear, with certain ranges of brightness or color more important visually than others For example, variegated shades of green such as leaves and plants in a forest are more easily discriminated than various shades of dark blue such as in the depths of a pool j Gentle gradations of brightness or color (such as a sunset blending gradually into a blue sky) are more important to the eye and more readily perceived than abrupt changes (such as pinstriped suits or confetti) The human retina has three types of color photoreceptor cells, called cones9 Each is sensitive to different wavelengths of light that roughly correspond to the colors red, green, and.

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trol channel can make their cable system nearly self-healing If not, the information received can direct the maintenance and repair staff to the problem area, thus minimizing downtime Utilization of a diagnostic ber is shown in Figure 8-17 This ber contains the diagnostic results and transmits the data to the headend or company of ce for analysis The diagnostic data analysis and compilation using a computer program provides management information on system problems and quality of service to the subscribers Many cable operators have rebuilt their systems to provide voice, video, and data services Such services consist of digital television (DTV, ADTV, and HDTV), voice over the Internet (VOIP), and Internet data and shopping services At present hybrid ber coax (HFC) technology is used here in America However, Japan is extending optical ber to the premises, making the entire distribution system optical This means the system bandwidth is enormous, right to the user When this will occur here in the United States, no one exactly knows All eyes are on Japan

9Rods, another type of photoreceptor cell, are only useful in low-light environments to provide what is commonly called night vision

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Using a PHP while Loop </title> </head> <body> <h1> Using a PHP while Loop </h1> < php $time = gettimeofday(); $start = $time[sec]; $time = gettimeofday(); $timeNow = $time[sec]; while ($timeNow < ($start + 01)){ $time = gettimeofday(); $timeNow = $time[sec]; echo "I'm going to keep going for a tenth of a second!<br>"; } > </body> </html>

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Summary

There s another version of the while loop the dowhile loop This loop checks its condition at the end of the loop, not at the beginning, which means that the loop s statement is always executed at least once (and that s good if that statement sets the condition you want to test to see if the loop should keep looping) Here s what this loop looks like formally:

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