opencv and PIL of pillow Conversion Operations in python

opencv > pil

import cv2 
from PIL import Image
img = cv2.imread("test.png")
image = Image.fromarray(cv2.cvtColor(img,cv2.COLOR_BGR2RGB)) 

pil > opencv

import cv2 
from PIL import Image 
image = Image.open("test.png") 
img = cv2.cvtColor(numpy.asarray(image),cv2.COLOR_RGB2BGR) 

Supplement: skimage and opencv picture format conversion

skimage is an image library of python, which is often used as the basic library of video and image classes together with matplotlib1. As a very popular visual library, opencv is very common in image processing. This paper introduces the conversion of image formats between the two libraries.

skimage

Image format

Channel: RGB

Pixel value: [0, 1]

Opencv

Image format

Channel: BGR

Pixel value: [0,255]

Conversion

The conversion process is now encapsulated as follows:

def skimage2opencv(src):
  src *= 255
  src.astype(int)
  cv2.cvtColor(src,cv2.COLOR_RGB2BGR)
  return src

def opencv2skimage(src):
  cv2.cvtColor(src,cv2.COLOR_BGR2RGB)
  src.astype(float32)
  src /= 255
  return src