opencv實(shí)現(xiàn)圖像縮放效果

cv2.resize(src,dsize,fx=0,fy=0,interpolation=cv2.INTER_LINEAR)

import cv2 as cv
import matplotlib.pyplot as plt
# 中文顯示配置
plt.rcParams['font.sans-serif']=['SimHei']  # 用來(lái)正常顯示中文標(biāo)簽
plt.rcParams['axes.unicode_minus']=False  # 用來(lái)正常顯示負(fù)號(hào)

# 載入圖像
img0 = cv.imread('img/img1.jpeg')

# 圖像縮放
# 絕對(duì)尺寸縮放
rows, cols = img0.shape[:2]
res0 = cv.resize(img0,(3*cols,3*rows),interpolation=cv.INTER_CUBIC)
# 相對(duì)尺寸縮放，若用相對(duì)縮放則第二個(gè)參數(shù)要設(shè)置為None
res1 = cv.resize(img0, None, fx = 0.5, fy = 0.5)

# 查看圖像大小
print(res0.shape)
print(res1.shape)
print(img0.shape)

# 圖像顯示
fig, axes = plt.subplots(nrows=1,ncols=3,figsize=(10,8),dpi=100)
axes[0].imshow(res0[:,:,::-1])
axes[0].set_title("絕對(duì)尺度放大")
axes[1].imshow(res1[:,:,::-1])
axes[1].set_title("相對(duì)尺度縮小")
axes[2].imshow(img0[:,:,::-1])
axes[2].set_title("原圖")
plt.show()