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特征提取之关键点检测 - GFTTDetector

该方法是基于shi-tomas角点检测变化而来的一种特征提取方法,OpenCV创建该检测器的API与goodfeaturetotrack的API参数极其类似:

Ptr<GFTTDetector> cv::GFTTDetector::create(
	int maxCorners = 1000,
	double qualityLevel = 0.01,
	double minDistance = 1,
	int blockSize = 3,
	bool useHarrisDetector = false,
	double k = 0.04
)

唯一不同的,该方法返回一个指针。

PS:

需要注意的是该方法无法提取描述子,只支持提取关键点!

代码:

import cv2 as cv


image = cv.imread("hist_02.jpg");
cv.imshow("input", image)

# 创建GFTT特征检测器
gftt = cv.GFTTDetector_create(100, 0.01,1, 3, False, 0.04)
kp1 = gftt.detect(image,None)
result = cv.drawKeypoints(image, kp1, None, (0, 255, 0), cv.DrawMatchesFlags_DEFAULT)

cv.imshow("GFTT-Keypoint-Detect", result)
cv.imwrite("GFTT-Keypoint-Detect.jpg", result)
cv.waitKey(0)
cv.destroyAllWindows()