Created
October 11, 2012 08:17
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Python+OpenCV feature detection
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#!/usr/bin/env python | |
# -*- coding: utf-8 -*- | |
""" | |
Tests the various feature detector algorithms in OpenCV 2.4 on one image | |
@SINCE: Thu Sep 13 23:01:23 2012 | |
@VERSION: 0.1 | |
@REQUIRES: OpenCV 2.4 (I used 2.4.0), matplotlib | |
@AUTHOR: Ripley6811 | |
@ORGANIZATION: National Cheng Kung University, Department of Earth Sciences | |
""" | |
__author__ = 'Ripley6811' | |
__copyright__ = '' | |
__license__ = '' | |
__date__ = 'Thu Sep 13 23:01:23 2012' | |
__version__ = '0.1' | |
import matplotlib.pyplot as plt | |
import cv2 | |
import time | |
def test_feature_detector(detector, imfname): | |
image = cv2.imread(imfname) | |
forb = cv2.FeatureDetector_create(detector) | |
# Detect crashes program if image is not greyscale | |
t1 = time.time() | |
kpts = forb.detect(cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)) | |
t2 = time.time() | |
print detector, 'number of KeyPoint objects', len(kpts), '(time', t2-t1, ')' | |
return kpts | |
def main(): | |
# Replace the underscore with an image to test | |
imfname = r'_______.bmp' | |
detector_format = ["","Grid","Pyramid"] | |
# "Dense" and "SimpleBlob" omitted because they caused the program to crash | |
detector_types = ["FAST","STAR","SIFT","SURF","ORB","MSER","GFTT","HARRIS"] | |
for form in detector_format: | |
for detector in detector_types: | |
kpts = test_feature_detector(form + detector, imfname) | |
# KeyPoint class: angle, class_id, octave, pt, response, size | |
plt.figure(form + detector) | |
for k in kpts: | |
x,y = k.pt | |
plt.plot(x,-y,'ro') | |
plt.axis('equal') | |
plt.show() | |
if __name__ == '__main__': | |
main() |
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