在Opencv Python中查找位掩码中的最高点

Question

我有一个对象的按位掩码，我想从中检测它的最高点。如何使用OpenCV Python实现这一点

^{tb1}$

原始图像：

这是代码

import cv2
import numpy as np

def line(im, pt1, pt2, color, thickness):
    im = cv2.line(im, pt1, pt2, color=color, thickness=thickness, lineType=cv2.LINE_AA)
    return im

def empty(a):
    pass

path = 'images/m_1.jpg'

global img
img = cv2.imread(path)
img = cv2.resize(img, (640, 480))
org_img = img.copy()
copy_img = img.copy()

img_blur = cv2.blur(img,(5,5))
imgHSV = cv2.cvtColor(img_blur, cv2.COLOR_BGR2HSV)

h_min = 0
h_max = 179
s_min = 0
s_max = 255
v_min = 48
v_max = 166

lower = np.array([h_min, s_min, v_min])
upper = np.array([h_max, s_max, v_max])

mask = cv2.inRange(imgHSV, lower, upper)

global imgResult
imgResult = cv2.bitwise_and(img, img, mask=mask)
imgResult = cv2.resize(imgResult, (640, 480))

cont, _ = cv2.findContours(mask, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE)

c = max(cont, key=cv2.contourArea)
x, y, w, h = cv2.boundingRect(c)
cv2.rectangle(img, (x, y), (x + w, y + h), (0, 255, 0), 2)

image = cv2.line(img, (int(w/2),y), (int(w/2),y+h), (0,0,255), 2)

global cropped_img
cropped_img = copy_img[y:y + h, x:x + w]

draw_img = np.zeros((img.shape[0], img.shape[1], img.shape[2]), dtype="uint8")
cv2.drawContours(draw_img,[c],-1,(255,255,255),thickness=-1)

img_bitwise = cv2.bitwise_and(org_img, draw_img)

margin = 90
draw_img = draw_img[margin:-margin]
imgResult = imgResult[margin:-margin]
img = img[margin:-margin]
img_bitwise = img_bitwise[margin:-margin]

print(draw_img.shape[:2])

has_white = print(np.any(draw_img, axis=1))
print(np.argmin(has_white))

result_i = np.argmin(has_white)
print(np.argmin(img_bitwise[result_i,:]))


cv2.imwrite('bit_img.png',img_bitwise)

cv2.imshow("Track Images", imgResult)
cv2.imshow("Result Images", img)
cv2.imshow("Cropped Image", cropped_img)
cv2.imshow("Draw Image", draw_img)
cv2.imshow("bit_img", img_bitwise)


k = cv2.waitKey(0)

if k == 27:  # wait for ESC key to exit
    cv2.destroyAllWindows()
elif k == ord('s'):  # wait for 's' key to save and exit
    cv2.imwrite(r'C:\Users\Anush\PycharmProjects\WeldPoolAnalysis\resultImages\imgResult.png', img)
    cv2.imwrite(r'C:\Users\Anush\PycharmProjects\WeldPoolAnalysis\resultImages\imgCropped.png', cropped_img)
    cv2.destroyAllWindows()

脚本的输出

(300, 640)
[[False False False]
 [False False False]
 [False False False]
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0
0

在下面的程序中使用原始图像作为主图像，这样您就可以轻松地调试问题

Answer 1

How can I retrieve my MainActivity context inside the runnable?

无法获取MainActivity上下文，因为它与正在运行的服务无关

如果确实希望直接显示对话框以响应推送通知，则应明确启动以对话框为主题的活动。比如：

protected void createAlert() {
    startActivity(new Intent(this, DialogThemedActivity.class).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK));
}