Store totalUse to disk & use si_prefixing for totalUse
This commit is contained in:
Ruben
parent
b6cef14d64
commit
8e409451e4
2 changed files with 276 additions and 4 deletions
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@ -6,7 +6,8 @@ import cv2
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import numpy as np
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import datetime
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import time
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import os
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from si_prefix import si_format
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import Adafruit_CharLCD as LCD
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# Set FPS (though RPi is probably to slow to meet it ;-)
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@ -51,6 +52,23 @@ lcd.message("Init scanner...")
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prevFaceCount = 0
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totalUse = 0 #in face-seconds
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# make sure log file exists
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if not os.path.exists("scan_face.log")
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with open("scan_face.log","w") as f:
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f.write("{},{},{}".format(time.time(), 0,0))
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# get last line of log file and update 'total use' using that.
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with open("scan_face.log", "rb") as f:
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first = f.readline() # Read the first line.
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f.seek(-2, os.SEEK_END) # Jump to the second last byte.
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while f.read(1) != b"\n": # Until EOL is found...
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f.seek(-2, os.SEEK_CUR) # ...jump back the read byte plus one more.
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last = f.readline() # Read last line.
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bits = last.split(",")
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totalUse = bits[2]
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log = open("scan_face.log", "a")
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lastFaceTime = datetime.datetime.utcnow()
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while True:
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@ -64,8 +82,7 @@ while True:
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gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
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print(time.time(),"grayed")
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faces = classifier.detectMultiScale(gray, 1.2, 5, minSize=(30,20))
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# TODO: time passed since last * prevFaceCount = usage
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print(time.time(),"Found {} faces".format(len(faces)))
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@ -76,7 +93,13 @@ while True:
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lcd.clear()
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#~ lcd.message("viewers {:>8}\nview-min. {:>7.2f}".format(len(faces), totalUse/60))
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lcd.message("viewers {:>8}\nview-sec {:>7}".format(len(faces), int(totalUse)))
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lcd.message("{:>7} viewers \n{:>7}view-sec".format(len(faces), si_format(totalUse,precision=1)))
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log.write("{},{},{}".format(time.time(), len(faces), int(totalUse)))
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log.flush()
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os.fsync(log.fileno())
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if len(faces) < 1 and end - lastFaceTime > dimTimeDelta:
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lcd.set_backlight(0)
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else:
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249
si_prefix.py
Normal file
249
si_prefix.py
Normal file
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@ -0,0 +1,249 @@
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# coding: utf-8
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from __future__ import division
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import math
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import re
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# Print a floating-point number in engineering notation.
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# Ported from [C version][1] written by
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# Jukka “Yucca” Korpela <jkorpela@cs.tut.fi>.
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#
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# [1]: http://www.cs.tut.fi/~jkorpela/c/eng.html
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SI_PREFIX_UNITS = "yzafpnum kMGTPEZY"
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CRE_SI_NUMBER = re.compile(r'\s*(?P<sign>[\+\-])?'
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r'(?P<integer>\d+)'
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r'(?P<fraction>.\d+)?\s*'
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r'(?P<si_unit>[%s])?\s*' % SI_PREFIX_UNITS)
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def split(value, precision=1):
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'''
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Split `value` into value and "exponent-of-10", where "exponent-of-10" is a
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multiple of 3. This corresponds to SI prefixes.
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Returns tuple, where the second value is the "exponent-of-10" and the first
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value is `value` divided by the "exponent-of-10".
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Args
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----
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value : int, float
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Input value.
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precision : int
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Number of digits after decimal place to include.
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Returns
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-------
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tuple
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The second value is the "exponent-of-10" and the first value is `value`
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divided by the "exponent-of-10".
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Examples
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--------
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.. code-block:: python
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si_prefix.split(0.04781) -> (47.8, -3)
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si_prefix.split(4781.123) -> (4.8, 3)
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See `si_prefix.format` for more examples.
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'''
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negative = False
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digits = precision + 1
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if value < 0.:
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value = -value
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negative = True
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elif value == 0.:
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return 0., 0
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expof10 = int(math.log10(value))
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if expof10 > 0:
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expof10 = (expof10 // 3) * 3
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else:
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expof10 = (-expof10 + 3) // 3 * (-3)
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value *= 10 ** (-expof10)
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if value >= 1000.:
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value /= 1000.0
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expof10 += 3
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elif value >= 100.0:
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digits -= 2
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elif value >= 10.0:
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digits -= 1
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if negative:
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value *= -1
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return value, int(expof10)
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def prefix(expof10):
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'''
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Args:
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expof10 : Exponent of a power of 10 associated with a SI unit
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character.
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Returns:
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str : One of the characters in "yzafpnum kMGTPEZY".
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'''
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prefix_levels = (len(SI_PREFIX_UNITS) - 1) // 2
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si_level = expof10 // 3
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if abs(si_level) > prefix_levels:
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raise ValueError("Exponent out range of available prefixes.")
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return SI_PREFIX_UNITS[si_level + prefix_levels]
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def si_format(value, precision=1, format_str='{value} {prefix}',
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exp_format_str='{value}e{expof10}'):
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'''
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Format value to string with SI prefix, using the specified precision.
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Args
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----
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value : int, float
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Input value.
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precision : int
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Number of digits after decimal place to include.
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format_str : str
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Format string where `{prefix}` and `{value}` represent the SI prefix
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and the value (scaled according to the prefix), respectively. The
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default format matches the `SI prefix style`_ format.
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exp_str : str
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Format string where `{expof10}` and `{value}` represent the exponent of
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10 and the value (scaled according to the exponent of 10),
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respectively. This format is used if the absolute exponent of 10 value
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is greater than 24.
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Returns
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-------
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str
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`value` formatted according to the `SI prefix style`_.
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Examples
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--------
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For example, with `precision=2`:
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.. code-block:: python
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1e-27 --> 1.00e-27
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1.764e-24 --> 1.76 y
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7.4088e-23 --> 74.09 y
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3.1117e-21 --> 3.11 z
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1.30691e-19 --> 130.69 z
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5.48903e-18 --> 5.49 a
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2.30539e-16 --> 230.54 a
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9.68265e-15 --> 9.68 f
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4.06671e-13 --> 406.67 f
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1.70802e-11 --> 17.08 p
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7.17368e-10 --> 717.37 p
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3.01295e-08 --> 30.13 n
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1.26544e-06 --> 1.27 u
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5.31484e-05 --> 53.15 u
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0.00223223 --> 2.23 m
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0.0937537 --> 93.75 m
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3.93766 --> 3.94
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165.382 --> 165.38
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6946.03 --> 6.95 k
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291733 --> 291.73 k
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1.22528e+07 --> 12.25 M
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5.14617e+08 --> 514.62 M
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2.16139e+10 --> 21.61 G
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9.07785e+11 --> 907.78 G
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3.8127e+13 --> 38.13 T
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1.60133e+15 --> 1.60 P
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6.7256e+16 --> 67.26 P
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2.82475e+18 --> 2.82 E
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1.1864e+20 --> 118.64 E
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4.98286e+21 --> 4.98 Z
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2.0928e+23 --> 209.28 Z
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8.78977e+24 --> 8.79 Y
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3.6917e+26 --> 369.17 Y
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1.55051e+28 --> 15.51e+27
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6.51216e+29 --> 651.22e+27
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.. _SI prefix style:
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http://physics.nist.gov/cuu/Units/checklist.html
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'''
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svalue, expof10 = split(value, precision)
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value_format = '%%.%df' % precision
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value_str = value_format % svalue
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try:
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return format_str.format(value=value_str,
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prefix=prefix(expof10).strip())
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except ValueError:
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sign = ''
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if expof10 > 0:
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sign = "+"
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return exp_format_str.format(value=value_str,
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expof10=''.join([sign, str(expof10)]))
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def si_parse(value):
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'''
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Parse a value expressed using SI prefix units to a floating point number.
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Args:
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value (str) : Value expressed using SI prefix units (as returned by
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`si_format` function).
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'''
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CRE_10E_NUMBER = re.compile(r'^\s*(?P<integer>[\+\-]?\d+)?'
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r'(?P<fraction>.\d+)?\s*([eE]\s*'
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r'(?P<expof10>[\+\-]?\d+))?$')
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CRE_SI_NUMBER = re.compile(r'^\s*(?P<number>(?P<integer>[\+\-]?\d+)?'
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r'(?P<fraction>.\d+)?)\s*'
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r'(?P<si_unit>[%s])?\s*$' % SI_PREFIX_UNITS)
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match = CRE_10E_NUMBER.match(value)
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if match:
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# Can be parse using `float`.
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assert(match.group('integer') is not None or
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match.group('fraction') is not None)
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return float(value)
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match = CRE_SI_NUMBER.match(value)
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assert(match.group('integer') is not None or
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match.group('fraction') is not None)
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d = match.groupdict()
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si_unit = d['si_unit'] if d['si_unit'] else ' '
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prefix_levels = (len(SI_PREFIX_UNITS) - 1) // 2
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scale = 10 ** (3 * (SI_PREFIX_UNITS.index(si_unit) - prefix_levels))
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return float(d['number']) * scale
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def si_prefix_scale(si_unit):
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'''
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Parameters
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----------
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si_unit : str
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SI unit character, i.e., one of "yzafpnum kMGTPEZY".
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Returns
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-------
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int
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Multiple associated with `si_unit`, e.g., 1000 for `si_unit=k`.
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'''
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return 10 ** si_prefix_expof10(si_unit)
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def si_prefix_expof10(si_unit):
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'''
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Parameters
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----------
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si_unit : str
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SI unit character, i.e., one of "yzafpnum kMGTPEZY".
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Returns
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-------
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int
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Exponent of the power of ten associated with `si_unit`, e.g., 3 for
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`si_unit=k` and -6 for `si_unit=u`.
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'''
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prefix_levels = (len(SI_PREFIX_UNITS) - 1) // 2
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return (3 * (SI_PREFIX_UNITS.index(si_unit) - prefix_levels))
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