# coding:utf-8
import cv2
import numpy as np
import glob

# 找棋盤格角點
# 閾值
criteria = (cv2.TERM_CRITERIA_EPS + cv2.TERM_CRITERIA_MAX_ITER, 30, 0.001)
# 棋盤格模板規(guī)格 從0開始計算
w = 9
h = 6
# 世界坐標系中的棋盤格點,例如(0,0,0), (1,0,0), (2,0,0) ....,(8,5,0)，去掉Z坐標，記為二維矩陣
objp = np.zeros((w * h, 3), np.float32)
objp[:, :2] = np.mgrid[0:w, 0:h].T.reshape(-1, 2)
# 儲存棋盤格角點的世界坐標和圖像坐標對
objpoints = []  # 在世界坐標系中的三維點
imgpoints = []  # 在圖像平面的二維點

# 匹配讀取文件夾內的特定文件
images = glob.glob('jz/*.jpg')
for fname in images:
    img = cv2.imread(fname)
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
# 找到棋盤格角點
    ret, corners = cv2.findChessboardCorners(gray, (w, h), None)
    # 將角點在圖像上顯示
    cv2.drawChessboardCorners(img, (w, h), corners, ret)
    cv2.imshow('findCorners', img)
    cv2.waitKey(500)
    cv2.destroyAllWindows()
    # 如果找到足夠點對，將其存儲起來
    if ret == True:
        cv2.cornerSubPix(gray, corners, (11, 11), (-1, -1), criteria)
        objpoints.append(objp)
        imgpoints.append(corners)


# 標定
ret, mtx, dist, rvecs, tvecs = cv2.calibrateCamera(objpoints, imgpoints, gray.shape[::-1], None, None)

# 在應用時，將下面兩個寫死
print(mtx)
print(dist)

# 去畸變
img2 = cv2.imread('77.jpg')
h, w = img2.shape[:2]
newcameramtx, roi = cv2.getOptimalNewCameraMatrix(mtx, dist, (w, h), 0, (w, h))  # 自由比例參數
dst = cv2.undistort(img2, mtx, dist, None, newcameramtx)
# 根據前面ROI區(qū)域裁剪圖片
# x,y,w,h = roi
# dst = dst[y:y+h, x:x+w]
cv2.imwrite('1.jpg', dst)
cv2.imshow('findCorners', dst)
cv2.waitKey(0)
cv2.destroyAllWindows()