滑动验证码 图片处理部分

Question

from PIL import Image


class ImgProcess:
location_list = [
    {'y': -58, 'x': -157},
    {'y': -58, 'x': -145},
    {'y': -58, 'x': -265},
    {'y': -58, 'x': -277},
    {'y': -58, 'x': -181},
    {'y': -58, 'x': -169},
    {'y': -58, 'x': -241},
    {'y': -58, 'x': -253},
    {'y': -58, 'x': -109},
    {'y': -58, 'x': -97},
    {'y': -58, 'x': -289},
    {'y': -58, 'x': -301},
    {'y': -58, 'x': -85},
    {'y': -58, 'x': -73},
    {'y': -58, 'x': -25},
    {'y': -58, 'x': -37},
    {'y': -58, 'x': -13},
    {'y': -58, 'x': -1},
    {'y': -58, 'x': -121},
    {'y': -58, 'x': -133},
    {'y': -58, 'x': -61},
    {'y': -58, 'x': -49},
    {'y': -58, 'x': -217},
    {'y': -58, 'x': -229},
    {'y': -58, 'x': -205},
    {'y': -58, 'x': -193},
    {'y': 0, 'x': -145},
    {'y': 0, 'x': -157},
    {'y': 0, 'x': -277},
    {'y': 0, 'x': -265},
    {'y': 0, 'x': -169},
    {'y': 0, 'x': -181},
    {'y': 0, 'x': -253},
    {'y': 0, 'x': -241},
    {'y': 0, 'x': -97},
    {'y': 0, 'x': -109},
    {'y': 0, 'x': -301},
    {'y': 0, 'x': -289},
    {'y': 0, 'x': -73},
    {'y': 0, 'x': -85},
    {'y': 0, 'x': -37},
    {'y': 0, 'x': -25},
    {'y': 0, 'x': -1},
    {'y': 0, 'x': -13},
    {'y': 0, 'x': -133},
    {'y': 0, 'x': -121},
    {'y': 0, 'x': -49},
    {'y': 0, 'x': -61},
    {'y': 0, 'x': -229},
    {'y': 0, 'x': -217},
    {'y': 0, 'x': -193},
    {'y': 0, 'x': -205}
]

def get_merge_image(self, filename):
    """
    根据图片位置合并还原
    :param filename: 图片
    :param location: 位置
    :return:合并后的图片对象
    """
    im = Image.open(filename)

    new_im = Image.new('RGB', (260, 116))
    im_list_upper = []
    im_list_lower = []

    for location in self.location_list:
        if location['y'] == -58:
            im_list_upper.append(im.crop((abs(location['x']), 58, abs(location['x']) + 10, 116)))
        if location['y'] == 0:
            im_list_lower.append(im.crop((abs(location['x']), 0, abs(location['x']) + 10, 58)))

    x_offset = 0
    for img in im_list_upper:
        new_im.paste(img, (x_offset, 0))
        x_offset += img.size[0]

    x_offset = 0
    for img in im_list_lower:
        new_im.paste(img, (x_offset, 58))
        x_offset += img.size[0]
    return new_im

def is_px_equal(self, img1, img2, x, y):
    """
    判断两个像素是否相同
    :param img1: 图片1
    :param img2:图片2
    :param x:位置1
    :param y:位置2
    :return:像素是否相同
    """
    pix1 = img1.load()[x, y]
    pix2 = img2.load()[x, y]
    threshold = 60

    if abs(pix1[0] - pix2[0]) < threshold and abs(pix1[1] - pix2[1]) < threshold and abs(pix1[2] - pix2[2]) < threshold:
        return True
    else:
        return False

def get_gap(self, img1, img2):
    """
    获取缺口偏移量
    :param img1: 不带缺口图片
    :param img2: 带缺口图片
    :return:
    """
    left = 0
    for i in range(left, img1.size[0]):
        for j in range(img1.size[1]):
            if not self.is_px_equal(img1, img2, i, j):
                left = i
                return left
    return left

这里的 list_upper ，ist_lower 有什么用？