import cv2

def draw_line_P(img, x1, y1, x2, y2, color = (255,255, 255), thickness = 3, lineType=cv2.LINE_AA):
    cv2.line(img, (x1, y1), (x2, y2), color, thickness, lineType)

img=cv2.imread("C:\Program Files (x86)\Photos for TZ\6_2.png")
img_gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
img_grayinv = cv2.bitwise_not(img_gray)
result = img.copy()
lines = cv2.HoughLinesP(img_grayinv, rho=1, theta=np.pi/720, threshold=230 ,minLineLength=150, maxLineGap = 15)
for line in lines:
    x1, y1, x2, y2 = line[0]
    draw_line_P(result, x1, y1, x2, y2)

cv2.imwrite("C:\Program Files (x86)\Photos for TZ\result", result)