def showImageGray(image_file):
    image_gray = cv2.imread(image_file, 0)
    plt.title('Gray')
    plt.gray()
    plt.imshow(image_gray)
    plt.axis('off')
    plt.show()
def showImageGray(image_file):
    image_gray = cv2.imread(image_file, 0)
    plt.title('Gray')
    plt.gray()
    plt.imshow(image_gray)
    plt.axis('off')
    plt.show()