sciscripts / cropimages.py

"""Crop images from pipette aspiration experiment.

Crops images from pipette aspiration experiment according to parameters 
stored in 'vampy.cfg' to reduce the disk size or to allow splitting the image if 
two pipettes are visible. The vampy.cfg file is then rewritten with zero crops.

"""

import glob
import Image
import sys
import os

CONFIGFILE = 'vampy.cfg'

def read_conf_file(filename):
	"""Read VAMPy configuration file."""
    imgcfg = {}
    try:
        conffile = open(filename, 'r')
    except IOError:
        return imgcfg
    lines = conffile.readlines()
    conffile.close()
    for line in lines:
        key, value = line.split(None,1)
        imgcfg[key] = value.rstrip('\n')
    return imgcfg
    
def rewrite_conf_file(params, filename):
	"""Rewrite VAMPy configuration file."""
    for side in ('left', 'right', 'top', 'bottom'):
        params[side] = '0'
    file = open(filename, 'w')
    for key, value in params.items():
        if isinstance(value, str):
            line = '%s\t%s\n'%(key, value)
        elif isinstance(value, (list, tuple)):
            line = str(key)+len(value)*'\t%s'%value+'\n'
        file.write(line)
    file.close()
    
def cropnsave(dirname):
	"""Perform crop of all files in a folder and save them in another folder."""
    savedir = dirname+'-croped'
    os.mkdir(savedir)
    configfile = os.path.join(dirname, CONFIGFILE)
    imgparams = read_conf_file(configfile)
    filelist = glob.glob(os.path.join(dirname, '*.png'))
    for i, file in enumerate(filelist):
        img = Image.open(file)
        w, h = img.size
        box = (int(imgparams['left']), int(imgparams['top']), 
                w-int(imgparams['right']), h-int(imgparams['bottom']))
        imgc = img.crop(box)
        dir, name = os.path.split(file)
        savename = os.path.join(savedir, name)
        imgc.save(savename)
        print 'Saved image %i of %i'%(i+1, len(filelist))
    saveconfig = os.path.join(savedir, CONFIGFILE)
    rewrite_conf_file(imgparams, saveconfig)
    
if __name__=='__main__':
    dirname = sys.argv[1]
    cropnsave(dirname)
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