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#!/usr/bin/python
import os
import sys
import cv
numbins = 255
runs = []
for arg in sys.argv[2:]:
runs += [[open(arg), sys.argv[1].rstrip('/') + '/' + arg.split('/')[-2] + '/']]
print "#name,run,frame,brightness"
for lines, pic_dir in runs:
for line in lines:
line = line.strip().split(',')
out = line[0:3]
name,run,frame = out
if frame != 'frame':
filename = pic_dir + frame + '.jpg'
image = cv.LoadImage(filename,cv.CV_LOAD_IMAGE_GRAYSCALE)
hist = cv.CreateHist([numbins+1],cv.CV_HIST_ARRAY,[[0,255]],1)
cv.CalcHist([image],hist)
#compute brightness
num = 0.
brightness = 0.
for i in range(numbins+1):
temp = cv.QueryHistValue_1D(hist,i)
num += temp
brightness += temp*i
out += [str(brightness/num)]
print ','.join(out)
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