Resize images using openCV in python

Question

I have the follow method to get all the images from a dir:

def ReadImages(Path):
    LabelList = list()
    ImageCV = list()
    classes = ["nonPdr", "pdr"]
    width = 605
    height = 700
    dim = (width, height)


    # Get all subdirectories
    FolderList = os.listdir(Path)

    # Loop over each directory
    for File in FolderList:
        if(os.path.isdir(os.path.join(Path, File))):
            for Image in os.listdir(os.path.join(Path, File)):
                # Convert the path into a file
                ImageCV.append(cv2.imread(os.path.join(Path, File) + os.path.sep + Image))
                # Add a label for each image and remove the file extension
                LabelList.append(classes.index(os.path.splitext(File)[0]))
        else:
            ImageCV.append(cv2.imread(os.path.join(Path, File) + os.path.sep + Image))    
            # Add a label for each image and remove the file extension
            LabelList.append(classes.index(os.path.splitext(File)[0]))
    return ImageCV, LabelList

But my images are bigger and a want to reduce its wxh to 605x700, then I tried to do something like This:

imgR = cv2.resize(ImageCV[Image])

And it not works.. What can I do to resize all these images? I appreciate any help.

It always helps to read the documentation for a method such as cv2.resize(). See the arguments needed. See tutorialkart.com/opencv/python/opencv-python-resize-image, for example. — fmw42
– fmw42, Commented Sep 2, 2019 at 19:03

Tarun Kolla · Accepted Answer · 2019-09-02 18:35:54Z

1

You may have to pass in the shape to resize() function of cv2.

This will resize the image to have 605 cols (width) and 700 rows (height):

imgR = cv2.resize(ImageCV[Image], (605, 700))

For more options you can read the documentation for cv2.resize.

Also, I would suggest using python coding conventions like imgR -> img_r, Image -> image, ImageCV -> image_cv etc. Hope this helps.

edited Sep 2, 2019 at 18:35

answered Sep 2, 2019 at 18:30

Tarun Kolla

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4 Comments

0nroth1 Over a year ago

TypeError: list indices must be integers or slices, not str

Tarun Kolla Over a year ago

It's something to do with your for loop. Try for index, value in enumerate(list): I can help if you post the code for it.

0nroth1 Over a year ago

Must I delete this : for Image in os.listdir(os.path.join(Path, File)):?

Tarun Kolla Over a year ago

I'm not sure as to where you are adding resize() to your code. But if its in that loop change it to for index, Image in enumerate(os.listdir(os.path.join(Path, File))): . Now, you could access list items by ImageCV[index].

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