利用OpenCV实现图像矫正

# 图像校正示例
import cv2
import numpy as np

im = cv2.imread("../dataset/data/paper.jpg")
gray = cv2.cvtColor(im, cv2.COLOR_BGR2GRAY)
cv2.imshow('im', im)

# 模糊第三个0  ，拿去翻译Gaussian kernel standard deviation in X direction.
blurred = cv2.GaussianBlur(gray, (5, 5), 0)
# 膨胀
dilate = cv2.dilate(blurred,                cv2.getStructuringElement(cv2.MORPH_RECT, (3, 3))) # 根据函数返回kernel
# 检测边沿
edged = cv2.Canny(dilate,  # 原始图像
                  30, 120,  # 滞后阈值、模糊度
                  3)  # 孔径大小
#