1 | Binary-file format
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2 | |<h4>Camera and histogram file format</h4>
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3 | The first line of the file always contains a thirteen-digit number
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4 | which is the time (in UTC) corresponding to the contained data as Unix
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5 | time (milli-seconds since 1/1/1970). The second line contains a
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6 | floating point number (in human readable ascii format) representing the
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7 | lower limit if the scale and the third line the upper limit. The next three
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8 | lines contain the three numbers displayed on top of the graphics,
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9 | usually the minumum, median and maximum data value. Everything
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10 | after is considered to be the data. For some restrictions of the HTML
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11 | GET mechanism available in JavaScript the data must not exceed ascii
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12 | character 127. So the full scale displayed, either in colors or as
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13 | graph, is from 0 to 127. Eeach ascii character represents one entry in
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14 | the camera or the histogram. The number of entries in the histogram can
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15 | be between 0 to hundreds, although more entries than a typical screen
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16 | has pixels does not make much sense. Keep in mind that the data is
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17 | reloaded every few seconds and the larger the file is the higher the
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18 | network traffic is. For the camera the number of entries is fixed and
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19 | must either be 40 (boards), 160 (patches), 320 (HV channels) or 1440
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20 | (pixels). They must be ordered by crate, board, chip, group, channel.
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21 | |
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