Skillfully use python to convert images into sketch and comic formats

# -*- coding: utf-8 -*-

import cv2

from PIL import Image, ImageOps, ImageFilter


# 转换成漫画风格
def toCarttonStyle(picturePath):
 # 设置输入输出路径和文件名称
 imgInput_FileName = picturePath
 imgOutput_FileName = picturePath.split(".")[0] + '_cartoon.' + picturePath.split(".")[1]

 # 属性设置
 num_down = 2 # 缩减像素采样的数目
 num_bilateral = 7 # 定义双边滤波的数目

 # 读取图片
 img_rgb = cv2.imread(imgInput_FileName)

 # 用高斯金字塔降低取样
 img_color = img_rgb
 for _ in range(num_down):
 img_color = cv2.pyrDown(img_color)

 # 重复使用小的双边滤波代替一个大的滤波
 for _ in range(num_bilateral):
 img_color = cv2.bilateralFilter(img_color, d=9, sigmaColor=9, sigmaSpace=7)

 # 升采样图片到原始大小
 for _ in range(num_down):
 img_color = cv2.pyrUp(img_color)

 # 转换为灰度并且使其产生中等的模糊
 img_gray = cv2.cvtColor(img_rgb, cv2.COLOR_RGB2GRAY)
 img_blur = cv2.medianBlur(img_gray, 7)

 # 检测到边缘并且增强其效果
 img_edge = cv2.adaptiveThreshold(img_blur, 255,
     cv2.ADAPTIVE_THRESH_MEAN_C,
     cv2.THRESH_BINARY,
     blockSize=9,
     C=2)
 
 # 算法处理后，照片的尺寸可能会不统一
 # 把照片的尺寸统一化
 height=img_rgb.shape[0]
 width = img_rgb.shape[1]
 img_color=cv2.resize(img_color,(width,height))
 
 # 转换回彩色图像
 img_edge = cv2.cvtColor(img_edge, cv2.COLOR_GRAY2RGB)
 img_cartoon = cv2.bitwise_and(img_color, img_edge)

 # 保存转换后的图片
 cv2.imwrite(imgOutput_FileName, img_cartoon)
 print('文件转换成漫画成功，保存在' + imgOutput_FileName)


# 透明度转换 素描转换的一部分
def dodge(a, b, alpha):
 # alpha为图片透明度
 return min(int(a * 255 / (256 - b * alpha)), 255)


# 图片转换为素描
def toSketchStyle(picturePath, blur=25, alpha=1.0):
 # 设置输入输出路径和文件名称
 imgInput_FileName = picturePath
 imgOutput_FileName = picturePath.split(".")[0] + '_Sketch.' + picturePath.split(".")[1]

 # 转化成ima对象
 img = Image.open(picturePath)
 # 将文件转成灰色
 img1 = img.convert('L')

 img2 = img1.copy()

 img2 = ImageOps.invert(img2)

 # 模糊度
 for i in range(blur):
 img2 = img2.filter(ImageFilter.BLUR)
 width, height = img1.size
 for x in range(width):
 for y in range(height):
  a = img1.getpixel((x, y))
  b = img2.getpixel((x, y))
  img1.putpixel((x, y), dodge(a, b, alpha))

 # 保存转换后文件
 img1.save(imgOutput_FileName)
 print('文件转换成漫画成功，保存在' + imgOutput_FileName)


if __name__ == '__main__':
 imgInput_FileName = input('输入文件路径：')
 while True:
 print('1、漫画风格')
 print('2、素描风格')
 userChoose = input('请选择风格（输入序号即可）：')
 if userChoose.__eq__('1'):
  toCarttonStyle(imgInput_FileName)
  break
 elif userChoose.__eq__('2'):
  toSketchStyle(imgInput_FileName)
  break
 else:
  print('违法输入（请输入序号）')
  break