CODEWITHSUNDEEP
python-2.7opencvimage-processing
Thamasha
Thamasha

Reputation: 347

Read Multiple images on a folder in OpenCv (python)

I want to read multiple images on a same folder using opencv (python). To do that do I need to use for loop or while loop with imread funcion? If so, how? please help me...

I want to get images into an array and then processed them one at a time through a loop.

Upvotes: 19

Views: 147059

Answers (7)

Dhiren Biren
Dhiren Biren

Reputation: 530

def flatten_images(folder):               # Path of folder (dataset)
    images=[]                             # list contatining  all images
    for filename in os.listdir(folder):
        print(filename)
        img=plt.imread(folder+filename)  # reading image (Folder path and image name )
        img=np.array(img)                #
        img=img.flatten()                # Flatten image 
        images.append(img)               # Appending all images in 'images' list 
    return(images)

Upvotes: 0

knowledge_seeker
knowledge_seeker

Reputation: 937

Here is how I did it without using glob, but with using the os module instead, since I could not get it to work with glob on my computer:

# This is to get the names of all the files in the desired directory
# Here I assume that they are all images
original_images = os.listdir('./path/containing/images')

# Here I construct a list of relative path strings for each image
original_images = [f"./path/containing/images/{file_name}" for file_name in original_images]

original_images = [cv2.imread(file) for file in original_images]

Upvotes: 1

Shivaraj
Shivaraj

Reputation: 41

This one has better time efficiency.

def read_img(img_list, img):
    n = cv2.imread(img, 0)
    img_list.append(n)
    return img_list

path = glob.glob("*.bmp") #or jpg
list_ = []`

cv_image = [read_img(list_, img) for img in path]

Upvotes: 4

Felipe Weber
Felipe Weber

Reputation: 59

import glob
import cv2 as cv

path = glob.glob("/path/to/folder/*.jpg")
cv_img = []
for img in path:
    n = cv.imread(img)
    cv_img.append(n)

Upvotes: 5

Dr Sokoban
Dr Sokoban

Reputation: 1638

import glob
import cv2

images = [cv2.imread(file) for file in glob.glob("path/to/files/*.png")]

Upvotes: 43

Bharat Kumar
Bharat Kumar

Reputation: 937

import cv2
from pathlib import Path

path=Path(".")

path=path.glob("*.jpg")

images=[]`


for imagepath in path.glob("*.jpg"):

        img=cv2.imread(str(imagepath))
        img=cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)                         
        img=cv2.resize(img,(200,200))
        images.append(img)
print(images)

Upvotes: 1

Anonymous Coward
Anonymous Coward

Reputation: 3200

This will get all the files in a folder in onlyfiles. And then it will read them all and store them in the array images.

from os import listdir
from os.path import isfile, join
import numpy
import cv2

mypath='/path/to/folder'
onlyfiles = [ f for f in listdir(mypath) if isfile(join(mypath,f)) ]
images = numpy.empty(len(onlyfiles), dtype=object)
for n in range(0, len(onlyfiles)):
  images[n] = cv2.imread( join(mypath,onlyfiles[n]) )

Upvotes: 14

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