'''
threshold segmentation
'''
import cv2
import imutils
import numpy as np

def threshold_seg(args):
    ''''''
    threshold = cv2.getTrackbarPos(trackbar_name1, wname)
    cimg = np.ones(img.shape, dtype=np.uint8)
    cimg[img <= threshold] = 0
    cimg[img > threshold] = 255
    cv2.imshow(wname, cimg)
if __name__ == '__main__':
    wname = 'threshold segmentation'
    trackbar_name1 = 'threshold'
    img = cv2.imread("./img_1596.png", 0)
    cv2.imshow('img', img)

    cv2.namedWindow(wname)
    cv2.createTrackbar(trackbar_name1, wname, 100, 255, threshold_seg)

    threshold_seg(0)
    if cv2.waitKey(0) == 27:
        cv2.destroyAllWindows()