本文实例为大家分享了python图片验证码实现代码,供大家参考,具体内容如下
#!/usr/bin/env python
# -*- coding: UTF-8 -*-
import random
from PIL import Image, ImageDraw, ImageFont, ImageFilter
try:
import cStringIO as StringIO
except ImportError:
import StringIO
_letter_cases = "abcdefghjkmnpqrstuvwxy" # 小写字母
_upper_cases = "ABCDEFGHJKLMNPQRSTUVWXY" # 大写字母
_numbers = "1234567890" # 数字
init_chars = ''.join((_letter_cases, _upper_cases, _numbers)) # 生成允许的字符集合
default_font = "./DejaVuSans.ttf" # 验证码字体
# 生成验证码接口
def generate_verify_image(size=(120, 30),
chars=init_chars,
img_type="GIF",
mode="RGB",
bg_color=(255, 255, 255),
fg_color=(0, 0, 255),
font_size=18,
font_type=default_font,
length=4,
draw_lines=True,
n_line=(1, 2),
draw_points=True,
point_chance=2,
save_img=False):
"""
生成验证码图片
:param size: 图片的大小,格式(宽,高),默认为(120, 30)
:param chars: 允许的字符集合,格式字符串
:param img_type: 图片保存的格式,默认为GIF,可选的为GIF,JPEG,TIFF,PNG
:param mode: 图片模式,默认为RGB
:param bg_color: 背景颜色,默认为白色
:param fg_color: 前景色,验证码字符颜色,默认为蓝色#0000FF
:param font_size: 验证码字体大小
:param font_type: 验证码字体,默认为 DejaVuSans.ttf
:param length: 验证码字符个数
:param draw_lines: 是否划干扰线
:param n_line: 干扰线的条数范围,格式元组,默认为(1, 2),只有draw_lines为True时有效
:param draw_points: 是否画干扰点
:param point_chance: 干扰点出现的概率,大小范围[0, 100]
:param save_img: 是否保存为图片
:return: [0]: 验证码字节流, [1]: 验证码图片中的字符串
"""
width, height = size # 宽, 高
img = Image.new(mode, size, bg_color) # 创建图形
draw = ImageDraw.Draw(img) # 创建画笔
def get_chars():
"""生成给定长度的字符串,返回列表格式"""
return random.sample(chars, length)
def create_lines():
"""绘制干扰线"""
line_num = random.randint(*n_line) # 干扰线条数
for i in range(line_num):
# 起始点
begin = (random.randint(0, size[0]), random.randint(0, size[1]))
# 结束点
end = (random.randint(0, size[0]), random.randint(0, size[1]))
draw.line([begin, end], fill=(0, 0, 0))
def create_points():
"""绘制干扰点"""
chance = min(100, max(0, int(point_chance))) # 大小限制在[0, 100]
for w in xrange(width):
for h in xrange(height):
tmp = random.randint(0, 100)
if tmp > 100 - chance:
draw.point((w, h), fill=(0, 0, 0))
def create_strs():
"""绘制验证码字符"""
c_chars = get_chars()
strs = ' %s ' % ' '.join(c_chars) # 每个字符前后以空格隔开
font = ImageFont.truetype(font_type, font_size)
font_width, font_height = font.getsize(strs)
draw.text(((width - font_width) / 3, (height - font_height) / 3),
strs, font=font, fill=fg_color)
return ''.join(c_chars)
if draw_lines:
create_lines()
if draw_points:
create_points()
strs = create_strs()
# 图形扭曲参数
params = [1 - float(random.randint(1, 2)) / 100,
0,
0,
0,
1 - float(random.randint(1, 10)) / 100,
float(random.randint(1, 2)) / 500,
0.001,
float(random.randint(1, 2)) / 500
]
img = img.transform(size, Image.PERSPECTIVE, params) # 创建扭曲
img = img.filter(ImageFilter.EDGE_ENHANCE_MORE) # 滤镜,边界加强(阈值更大)
mstream = StringIO.StringIO()
img.save(mstream, img_type)
if save_img:
img.save("validate.gif", img_type)
return mstream, strs
if __name__ == "__main__":
mstream, strs = generate_verify_image(save_img=True)
print strs
以上就是本文的全部内容,希望对大家学习python程序设计有所帮助。
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