resize遅い件の謎

opencv_benchmark.py

import sys
import time
import cv2
import numpy as np

### VALUES
NUM_REPEAT = 10000

### Read source image
# img_src = cv2.imread("lena.jpg")
img_src = np.zeros((1, 1, 3), dtype=np.uint8)

size_list = list(range(100, 1001, 20))

print("resize")
for size in size_list:
  time_start = time.time()
  for i in range (NUM_REPEAT):
      img_dst = cv2.resize(img_src, (size, size))
  time_end = time.time()
  duration = (time_end - time_start) * 1000 / NUM_REPEAT
  print(f"resize:{size}x{size}, {size*size}, {duration}")


print("cvtColor")
for size in size_list:
  img_tmp = cv2.resize(img_src, (size, size))
  time_start = time.time()
  for i in range (NUM_REPEAT):
      img_dst = cv2.cvtColor(img_tmp, cv2.COLOR_BGR2RGB)
  time_end = time.time()
  duration = (time_end - time_start) * 1000 / NUM_REPEAT
  print(f"cvtColor:{size}x{size}, {size*size}, {duration}")