REVA-QCAV/load.py
2017-08-21 18:00:07 +02:00

48 lines
1.3 KiB
Python

#
# load.py : utils on generators / lists of ids to transform from strings to
# cropped images and masks
import os
import numpy as np
from PIL import Image
from functools import partial
from utils import resize_and_crop, get_square, normalize
def get_ids(dir):
"""Returns a list of the ids in the directory"""
return (f[:-4] for f in os.listdir(dir))
def split_ids(ids, n=2):
"""Split each id in n, creating n tuples (id, k) for each id"""
return ((id, i) for i in range(n) for id in ids)
def to_cropped_imgs(ids, dir, suffix):
"""From a list of tuples, returns the correct cropped img"""
for id, pos in ids:
im = resize_and_crop(Image.open(dir + id + suffix))
yield get_square(im, pos)
def get_imgs_and_masks(ids, dir_img, dir_mask):
"""Return all the couples (img, mask)"""
imgs = to_cropped_imgs(ids, dir_img, '.jpg')
# need to transform from HWC to CHW
imgs_switched = map(partial(np.transpose, axes=[2, 0, 1]), imgs)
imgs_normalized = map(normalize, imgs_switched)
masks = to_cropped_imgs(ids, dir_mask, '_mask.gif')
return zip(imgs_normalized, masks)
def get_full_img_and_mask(id, dir_img, dir_mask):
im = Image.open(dir_img + id + '.jpg')
mask = Image.open(dir_mask + id + '_mask.gif')
return np.array(im), np.array(mask)