#!/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)