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#!/usr/bin/env python
from mincepie import mapreducer, launcher
import gflags
import os
import cv2
from PIL import Image
# gflags
gflags.DEFINE_string('image_lib', 'opencv',
'OpenCV or PIL, case insensitive. The default value is the faster OpenCV.')
gflags.DEFINE_string('input_folder', '',
'The folder that contains all input images, organized in synsets.')
gflags.DEFINE_integer('output_side_length', 256,
'Expected side length of the output image.')
gflags.DEFINE_string('output_folder', '',
'The folder that we write output resized and cropped images to')
FLAGS = gflags.FLAGS
class OpenCVResizeCrop:
def resize_and_crop_image(self, input_file, output_file, output_side_length = 256):
'''Takes an image name, resize it and crop the center square
'''
img = cv2.imread(input_file)
height, width, depth = img.shape
new_height = output_side_length
new_width = output_side_length
if height > width:
new_height = output_side_length * height / width
else:
new_width = output_side_length * width / height
resized_img = cv2.resize(img, (new_width, new_height))
height_offset = (new_height - output_side_length) / 2
width_offset = (new_width - output_side_length) / 2
cropped_img = resized_img[height_offset:height_offset + output_side_length,
width_offset:width_offset + output_side_length]
cv2.imwrite(output_file, cropped_img)
class PILResizeCrop:
## http://united-coders.com/christian-harms/image-resizing-tips-every-coder-should-know/
def resize_and_crop_image(self, input_file, output_file, output_side_length = 256, fit = True):
'''Downsample the image.
'''
img = Image.open(input_file)
box = (output_side_length, output_side_length)
#preresize image with factor 2, 4, 8 and fast algorithm
factor = 1
while img.size[0]/factor > 2*box[0] and img.size[1]*2/factor > 2*box[1]:
factor *=2
if factor > 1:
img.thumbnail((img.size[0]/factor, img.size[1]/factor), Image.NEAREST)
#calculate the cropping box and get the cropped part
if fit:
x1 = y1 = 0
x2, y2 = img.size
wRatio = 1.0 * x2/box[0]
hRatio = 1.0 * y2/box[1]
if hRatio > wRatio:
y1 = int(y2/2-box[1]*wRatio/2)
y2 = int(y2/2+box[1]*wRatio/2)
else:
x1 = int(x2/2-box[0]*hRatio/2)
x2 = int(x2/2+box[0]*hRatio/2)
img = img.crop((x1,y1,x2,y2))
#Resize the image with best quality algorithm ANTI-ALIAS
img.thumbnail(box, Image.ANTIALIAS)
#save it into a file-like object
with open(output_file, 'wb') as out:
img.save(out, 'JPEG', quality=75)
class ResizeCropImagesMapper(mapreducer.BasicMapper):
'''The ImageNet Compute mapper.
The input value would be the file listing images' paths relative to input_folder.
'''
def map(self, key, value):
if type(value) is not str:
value = str(value)
files = [value]
image_lib = FLAGS.image_lib.lower()
if image_lib == 'pil':
resize_crop = PILResizeCrop()
else:
resize_crop = OpenCVResizeCrop()
for i, line in enumerate(files):
try:
line = line.replace(FLAGS.input_folder, '').strip()
line = line.split()
image_file_name = line[0]
input_file = os.path.join(FLAGS.input_folder, image_file_name)
output_file = os.path.join(FLAGS.output_folder, image_file_name)
output_dir = output_file[:output_file.rfind('/')]
if not os.path.exists(output_dir):
os.makedirs(output_dir)
feat = resize_crop.resize_and_crop_image(input_file, output_file,
FLAGS.output_side_length)
except Exception, e:
# we ignore the exception (maybe the image is corrupted?)
print line, Exception, e
yield value, FLAGS.output_folder
mapreducer.REGISTER_DEFAULT_MAPPER(ResizeCropImagesMapper)
mapreducer.REGISTER_DEFAULT_REDUCER(mapreducer.NoPassReducer)
mapreducer.REGISTER_DEFAULT_READER(mapreducer.FileReader)
mapreducer.REGISTER_DEFAULT_WRITER(mapreducer.FileWriter)
if __name__ == '__main__':
launcher.launch()
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