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def pyramid_demo(image,level):
temp = image.copy()
pyramid_images = []
for i in range(level):
dst = cv2.pyrDown(temp)
pyramid_images.append(dst)
cv2.imshow("pyramid_down_"+str(i), dst)
temp = dst.copy()
return pyramid_images[level-1]
图二是图一缩小在拉大的低分辨率图像 ,由于图像缩小后部分像素丢失,只能取周围相似像素填充,图像分辨率因此降低