python PIL/cv2/base64相互转换实例
PIL和cv2是python中两个常用的图像处理库，PIL一般是anaconda自带的，cv2是opencv的python版本。base64在网络传输图片的时候经常用到。
##PIL读取、保存图片方法
from PIL import Image
img = Image.open(img_path)
img.save(img_path2)
##cv2读取、保存图片方法
import cv2
img = cv2.imread(img_path)
cv2.imwrite(img_path2, img)
##图片文件打开为base64
import base64
def img_base64(img_path):
with open(img_path,"rb") as f:
base64_str = base64.b64encode(f.read())
return base64_str
1、PIL和cv2转换
##PIL转cv2 import cv2 from PIL import Image import numpy as np def pil_cv2(img_path): image = Image.open(img_path) img = cv2.cvtColor(np.asarray(image),cv2.COLOR_RGB2BGR) return img ##cv2转PIL import cv2 from PIL import Image def cv2_pil(img_path): image = cv2.imread(img_path) image = Image.fromarray(cv2.cvtColor(image,cv2.COLOR_BGR2RGB)) return image
2、PIL和base64转换
##PIL转base64 import base64 from io import BytesIO def pil_base64(image): img_buffer = BytesIO() image.save(img_buffer, format='JPEG') byte_data = img_buffer.getvalue() base64_str = base64.b64encode(byte_data) return base64_str ##base64转PIL import base64 from io import BytesIO from PIL import Image def base64_pil(base64_str): image = base64.b64decode(base64_str) image = BytesIO(image) image = Image.open(image) return image
3、cv2和base64转换
##cv2转base64
import cv2
def cv2_base64(image):
base64_str = cv2.imencode('.jpg',image)[1].tostring()
base64_str = base64.b64encode(base64_str)
return base64_str
##base64转cv2
import base64
import numpy as np
import cv2
def base64_cv2(base64_str):
imgString = base64.b64decode(base64_str)
nparr = np.fromstring(imgString,np.uint8)
image = cv2.imdecode(nparr,cv2.IMREAD_COLOR)
return image
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