python 讀圖片效能測試

 

pil讀圖片需要0ms，但是轉換opencv需要13ms

opencv讀圖片需要13ms

 

import numpy as np
import cv2
import time

from PIL import Image


def a():
    path='d:/1.jpg'
    for i in range(10):
        start=time.time()
        roiImg=Image.open(path)

        img = cv2.cvtColor(np.asarray(roiImg), cv2.COLOR_RGB2BGR)
        read_time=time.time()-start
        start = time.time()
        imgByteArr = io.BytesIO()
        roiImg.save(imgByteArr, format='BMP')
        # roiImg.save(imgByteArr, format='Jpeg')
        # imgByteArr = imgByteArr.getvalue()
        print('pil time',read_time,time.time()-start)
        start = time.time()
        img=Image.open(imgByteArr)
        print('read io time',  time.time() - start)
        # img.show()
        # cv2.imshow('',img_decode)
        # cv2.waitKey(1)