How to create thumbnails using opencv-python?
Question:
I’m trying to downsample my image(using anti-aliasing) using Python-Pillow's im.thumbnail() method.
My code looks like:
MAXSIZE = 1024
im.thumbnail(MAXSIZE, Image.ANTIALIAS)
Can you tell me some alternative in opencv-python to perform this re-sizing operation ?
Answers:
You can use cv2.resize . Documentation here: http://docs.opencv.org/modules/imgproc/doc/geometric_transformations.html#resize
In your case, assuming the input image im is a numpy array:
maxsize = (1024,1024)
imRes = cv2.resize(im,maxsize,interpolation=cv2.CV_INTER_AREA)
There are different types of interpolation available (INTER_CUBIC, INTER_NEAREST, INTER_AREA,…) but according to the documentation if you need to shrink the image, you should get better results with CV_INTER_AREA.
I got error:
AttributeError: module ‘cv2’ has no attribute ‘CV_INTER_AREA’
Following is worked for me:
imRes = cv2.resize(im,maxsize,interpolation=cv2.INTER_AREA
I’m trying to downsample my image(using anti-aliasing) using Python-Pillow's im.thumbnail() method.
My code looks like:
MAXSIZE = 1024
im.thumbnail(MAXSIZE, Image.ANTIALIAS)
Can you tell me some alternative in opencv-python to perform this re-sizing operation ?
You can use cv2.resize . Documentation here: http://docs.opencv.org/modules/imgproc/doc/geometric_transformations.html#resize
In your case, assuming the input image im is a numpy array:
maxsize = (1024,1024)
imRes = cv2.resize(im,maxsize,interpolation=cv2.CV_INTER_AREA)
There are different types of interpolation available (INTER_CUBIC, INTER_NEAREST, INTER_AREA,…) but according to the documentation if you need to shrink the image, you should get better results with CV_INTER_AREA.
I got error:
AttributeError: module ‘cv2’ has no attribute ‘CV_INTER_AREA’
Following is worked for me:
imRes = cv2.resize(im,maxsize,interpolation=cv2.INTER_AREA