init - 初始化项目

samples/python/mouse_and_match.py

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+#!/usr/bin/env python
+'''
+mouse_and_match.py [-i path | --input path: default ../data/]
+
+Demonstrate using a mouse to interact with an image:
+ Read in the images in a directory one by one
+ Allow the user to select parts of an image with a mouse
+ When they let go of the mouse, it correlates (using matchTemplate) that patch with the image.
+
+ SPACE for next image
+ ESC to exit
+'''
+
+# Python 2/3 compatibility
+from __future__ import print_function
+
+import numpy as np
+import cv2 as cv
+
+# built-in modules
+import os
+import sys
+import glob
+import argparse
+from math import *
+
+
+class App():
+    drag_start = None
+    sel = (0,0,0,0)
+
+    def onmouse(self, event, x, y, flags, param):
+        if event == cv.EVENT_LBUTTONDOWN:
+            self.drag_start = x, y
+            self.sel = (0,0,0,0)
+        elif event == cv.EVENT_LBUTTONUP:
+            if self.sel[2] > self.sel[0] and self.sel[3] > self.sel[1]:
+                patch = self.gray[self.sel[1]:self.sel[3], self.sel[0]:self.sel[2]]
+                result = cv.matchTemplate(self.gray, patch, cv.TM_CCOEFF_NORMED)
+                result = np.abs(result)**3
+                _val, result = cv.threshold(result, 0.01, 0, cv.THRESH_TOZERO)
+                result8 = cv.normalize(result, None, 0, 255, cv.NORM_MINMAX, cv.CV_8U)
+                cv.imshow("result", result8)
+            self.drag_start = None
+        elif self.drag_start:
+            #print flags
+            if flags & cv.EVENT_FLAG_LBUTTON:
+                minpos = min(self.drag_start[0], x), min(self.drag_start[1], y)
+                maxpos = max(self.drag_start[0], x), max(self.drag_start[1], y)
+                self.sel = (minpos[0], minpos[1], maxpos[0], maxpos[1])
+                img = cv.cvtColor(self.gray, cv.COLOR_GRAY2BGR)
+                cv.rectangle(img, (self.sel[0], self.sel[1]), (self.sel[2], self.sel[3]), (0,255,255), 1)
+                cv.imshow("gray", img)
+            else:
+                print("selection is complete")
+                self.drag_start = None
+
+    def run(self):
+        parser = argparse.ArgumentParser(description='Demonstrate mouse interaction with images')
+        parser.add_argument("-i","--input", default='../data/', help="Input directory.")
+        args = parser.parse_args()
+        path = args.input
+
+        cv.namedWindow("gray",1)
+        cv.setMouseCallback("gray", self.onmouse)
+        '''Loop through all the images in the directory'''
+        for infile in glob.glob( os.path.join(path, '*.*') ):
+            ext = os.path.splitext(infile)[1][1:] #get the filename extension
+            if ext == "png" or ext == "jpg" or ext == "bmp" or ext == "tiff" or ext == "pbm":
+                print(infile)
+
+                img = cv.imread(infile,1)
+                if img is None:
+                    continue
+                self.sel = (0,0,0,0)
+                self.drag_start = None
+                self.gray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
+                cv.imshow("gray", self.gray)
+                if cv.waitKey() == 27:
+                    break
+
+        print('Done')
+
+
+if __name__ == '__main__':
+    print(__doc__)
+    App().run()
+    cv.destroyAllWindows()