python使用OpenCV库将图片转为字符串

淩亂°似流年 2022-09-11 14:27 138阅读 0赞

[原文][Link 1]:`https://www.blog.hiyj.cn/article/detail/110`

# 简笔画图片转字符串 #

## 效果 ##

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAd2luZFNub3dMaQ_size_20_color_FFFFFF_t_70_g_se_x_16]

## 结果 ##

![在这里插入图片描述][watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAd2luZFNub3dMaQ_size_10_color_FFFFFF_t_70_g_se_x_16]

## [源码示例][Link 2]:`https://github.com/WindSnowLi/My-python-tools/tree/main/Img->Str` ##

# encoding:utf-8
    
    # 简笔画图片转字符串
    
    import cv2
    
    # 字符
    char = [' ', '`', '.', '^', ',', ':', '~', '"', '<', '!', 'c', 't', '+', '{', 'i', '7', '?', 'u', '3', '0', 'p',
            'w', '4', 'A', '8', 'D', 'X', '%', '#', 'H', 'W', 'M']
    # 对应的字符
    target = [0, 5, 7, 9, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 59,
              61, 63, 66,
              68, 70]
    
    
    def get_index(num):
        """ 查找像素值对应字符 :param num: :return: """
        if num > 70:
            return ' '
        for _ in range(0, 5):
            if num not in target:
                num = num + 1
                if num > 70:
                    return ' '
            else:
                return char[target.index(num)]
    
    
    def get_block(img, x, y, block_size):
        """ 获取块平均像素值 :param img: 图片 :param x: 起点X轴 :param y: 起点y轴 :param block_size: 块边长 :return: 块平均像素值 """
        rs = 0
        for i in range(block_size):
            if x + i >= img.shape[0]:
                return int(rs / block_size ** 2)
            for j in range(block_size):
                if y + i >= img.shape[1]:
                    return int(rs / block_size ** 2)
                rs = rs + img[x + i][y + j]
        return int(rs / block_size ** 2)
    
    
    if __name__ == '__main__':
        # 读取图片
        img = cv2.imread('./test.jpg')
        # 转为灰度图
        img = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY)
        height, width = img.shape
        # 最大宽度设为192
        rate = width / 192
        if rate > 1:
            width = int(width / rate)
            height = int(height / rate)
        # 重设为宽度小于192的图片
        img = cv2.resize(img, (width, height))
    
        with open('./pic.txt', 'w') as fp:
            step = 4
            for i in range(0, height, step):
                for j in range(0, width, step):
                    # 反转图片并把像素值设为0~70
                    value = 70 - int(get_block(img, i, j, step) * 70 / 255)
                    fp.write(str(get_index(value)) + ' ')
                fp.write('\n')

[Link 1]: https://www.blog.hiyj.cn/article/detail/110
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAd2luZFNub3dMaQ_size_20_color_FFFFFF_t_70_g_se_x_16]: /images/20220828/270b1eb30b4c41b98f0b0348ad06af39.png
[watermark_type_ZHJvaWRzYW5zZmFsbGJhY2s_shadow_50_text_Q1NETiBAd2luZFNub3dMaQ_size_10_color_FFFFFF_t_70_g_se_x_16]: /images/20220828/10471f5bb84845f5b622aed2e7b97b7f.png
[Link 2]: https://github.com/WindSnowLi/My-python-tools/tree/main/Img-%3EStr