上一張經典的圖
這張圖表示FAST取角點的方法
底下是python的範例
#!/usr/bin/env python3.4
import numpy as np
import cv2
from matplotlib import pyplot as plt
def main():
""" Main behaviour """
print("test")
image = cv2.imread("lena.png")
gray=cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
fast = cv2.FastFeatureDetector_create()
keypoints = fast.detect(gray,None)
image2 = cv2.drawKeypoints(gray, keypoints, image, color=(255,0,0))
cv2.imshow("Image",image2)
#取出keypoint的x,y用numpy版本
np_pts = np.asarray([kp.pt for kp in keypoints])
print(np_pts[0])
#keypoint轉成List格式
index = []
for point in keypoints:
temp = (point.pt, point.size, point.angle, point.response, point.octave, point.class_id)
index.append(temp)
print(index[0])
#---------------List轉keypoint----------------------------------
#kps = []
#for point in index:
# temp = cv2.KeyPoint(x=point[0][0],y=point[0][1],_size=point[1], _angle=point[2], _response=point[3], _octave=point[4], _class_id=point[5])
# kps.append(temp)
#image3 = cv2.drawKeypoints(gray, kps, image, color=(0,0,255))
#-------------------------------------------------
#cv2.imwrite('fast_false.png',image2)
cv2.waitKey(0)
if __name__ == "__main__":
main()
