Dirty hack to fake long exposure from a quicktime movie

long_exposure.py

import os
import tempfile
import subprocess
import skimage
from skimage import exposure
import skimage.io as io
import argparse
import shutil
import numpy as np

for movfile in os.listdir("./"):
    if not movfile.lower().endswith(".mov"):
        continue
    
    # movfile = "IMG_1318.MOV"
    basechunk = os.path.splitext(movfile)[0]
    # outdir = tempfile.mkdtemp()
    outdir = basechunk
    try:
        os.mkdir(outdir)
    except OSError, e:
        pass
    
    subprocess.check_call(["ffmpeg", "-i", movfile, os.path.join(outdir, "frame-%0d.png")])
    coll = io.ImageCollection(
      os.path.join(outdir, "frame-*.png"),
      conserve_memory=True,
      load_func=lambda f: io.imread(f).astype(np.float32))
    # calculate an averaged frame
    sumd = reduce(np.add, coll)
    sumd = exposure.rescale_intensity(sumd)
    io.imsave(basechunk+"_sum.png", sumd, )
    # create a frame made up of all the brightest pixels
    maxd = reduce(np.maximum, coll)
    maxd = exposure.rescale_intensity(maxd)
    io.imsave(basechunk+"_max.png", maxd, )
    # Smush these two together in an arbitrary way to get some combination of brightness and detail
    combd = sumd*3 + maxd
    combd = exposure.rescale_intensity(combd)
    io.imsave(basechunk+"_comb.png", combd, )
    
    shutil.rmtree(outdir)