Commit 15ab4be

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update ch26

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Original file line number	Diff line number	Diff line change
`@@ -2,6 +2,8 @@`
`2`	`2`	`__author__ = 'play4fun'`
`3`	`3`	`"""`
`4`	`4`	`create time:15-10-25 下午12:02`
	`5`	`+一个圆环需要 3 个参数来确定。所以进行圆环夫变换的累加器必须是 3 维的`
	`6`	`+ 这样的效率就会很低。所以 OpenCV 用来一个比巧妙的办法霍夫梯度法它可以使用边界的梯度信息。`
`5`	`7`	`"""`
`6`	`8`
`7`	`9`	`import cv2`
`@@ -12,6 +14,7 @@`
`12`	`14`	`cimg = cv2.cvtColor(img, cv2.COLOR_GRAY2BGR)`
`13`	`15`
`14`	`16`	`circles = cv2.HoughCircles(img, cv2.HOUGH_GRADIENT, 1, 20, param1=50, param2=30, minRadius=0, maxRadius=0)`
	`17`	`+`
`15`	`18`	`circles = np.uint16(np.around(circles))`
`16`	`19`	`print(circles)`
`17`	`20`
`@@ -20,6 +23,7 @@`
`20`	`23`	`cv2.circle(cimg, (i[0], i[1]), i[2], (0, 255, 0), 2)`
`21`	`24`	`# draw the center of the circle`
`22`	`25`	`cv2.circle(cimg, (i[0], i[1]), 2, (0, 0, 255), 3)`
	`26`	`+`
`23`	`27`	`cv2.imshow('detected circles', cimg)`
`24`	`28`	`cv2.waitKey(0)`
`25`	`29`	`cv2.destroyAllWindows()`

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