OpenCV高斯滤波
blur_img_cv = cv2.GaussianBlur(ba_img, (ksize, ksize), sigma)
PIL.ImageFilter中高斯滤波
from PIL import ImageFilter
pil_blur = ba_img.filter(ImageFilter.GaussianBlur(sigma))
PIL滤波和OpenCV滤波之间的转换
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OpenCV滤波转换为PIL滤波
根据cv2.GaussianBlur(ba_img, (ksize, ksize), sigma)和ba_img.filter(ImageFilter.GaussianBlur(sigma))知,OpenCV滤波函数参数比PIL多一个ksize参数,sigma参数相同,直接转换即可。 -
PIL滤波转换为OpenCV滤波
OpenCV滤波函数比PIL多了一个ksize滤波参数,需要根据sigma计算ksize,根据OpenCV中滤波函数的参数计算可以得到,并且保证是奇数。
k s i z e = 2 × ( s i g m a − 0.8 0.3 + 1 ) + 1 ksize=2 \times(\frac{sigma-0.8}{0.3}+1)+1 ksize=2×(0.3sigma−0.8+1)+1ksize = int(2*((sigma-0.8)/0.3+1)+1) if ksize % 2.0 == 0: ksize = ksize + 1 blur_img_cv = cv2.GaussianBlur(ba_img, (ksize, ksize), sigma)
参考资料
OpenCV高斯滤波GaussianBlur
Why is Gaussian Filter different between cv2 and skimage?
For PIL.ImageFilter.GaussianBlur how what kernel is used and does the radius parameter relate to standard deviation?