Resize image cv2 how to#
Resize image cv2 code#

Return cv2.resize(image, dim, interpolation=inter)Ĭv2.imshow('width_100', maintain_aspect_ratio_resize(image, width=100))Ĭv2. GitHub - PyImageSearch/imutils: A series of convenience functions to make basic image processing operations such as translation, rotation, resizing, skeletonization, and displaying Matplotlib images easier with OpenCV and Python.

We will use Python version 3.6.0, OpenCV version 3.2.0.

Resize image cv2 how to#

# Calculate the ratio of the width and construct the dimensions Quick Recap on Comands How to Resize an Image in Python in Short In this article, we will cover the basics of image manipulation in OpenCV and how to resize an image in Python, its cropping, and rotating techniques. # We are resizing width if height is none # Calculate the ratio of the height and construct the dimensions # We are resizing height if width is none # Return original image if no need to resize # Grab the image size and initialize dimensions The aspect ratio can be preserved or not, based on the requirement. Resizing does only change the width and height of the image. Here's a function to upscale or downscale an image by desired width or height while maintaining aspect ratio # Resizes a image and maintains aspect ratioĭef maintain_aspect_ratio_resize(image, width=None, height=None, inter=cv2.INTER_AREA): To resize an image in Python, you can use cv2.resize() function of OpenCV library cv2. Thumbnail = cv.resize(im, (round(width / 10), round(height / 10)), interpolation=cv.INTER_AREA)

Resize image cv2 code#

Using your code with cv2 import cv2 as cv Note that the initial dst type or size are not taken into account. Img = cv2.resize(img, None, fx=scaling_factor, fy=scaling_factor, interpolation=cv2.INTER_AREA) The function resize resizes the image src down to or up to the specified size. Scaling_factor = max_width / float(width) If max_width/float(width) < scaling_factor: Scaling_factor = max_height / float(height) Call the thumbnail() method on the Image instance, passing a tuple argument. If max_height < height or max_width < width: Resize Images in Python With Pillow Perform steps 1 and 2 of the above procedure. # only shrink if img is bigger than required Example shrink image to fit a max height/width (keeping aspect ratio) import cv2 To shrink an image, it will generally look best with INTER_AREA interpolation, whereas to enlarge an image, it will generally look best with INTER_CUBIC (slow) or INTER_LINEAR (faster but still looks OK). Where fx is the scaling factor along the horizontal axis and fy along the vertical axis. The new size can be specified:ĭst = cv2.resize(src, (2*width, 2*height), interpolation = cv2.INTER_CUBIC)ĭst = cv2.resize(src, None, fx = 2, fy = 2, interpolation = cv2.INTER_CUBIC),