python如何将图片转换素描画

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


import cv2
import numpy as np
from tkinter import filedialog, Tk
from os import getcwd
from re import findall


def open_path():
  # 图片路径
  root = Tk()
  root.withdraw()
  file_path = (filedialog.askopenfilename(title=\'选择图片文件\', filetypes=[(\'All Files\', \'*\')]))
  return file_path


def dodgeNaive(image, mask):
  # determine the shape of the input image
  width, height = image.shape[:2]

  # prepare output argument with same size as image
  blend = np.zeros((width, height), np.uint8)

  for col in range(width):
    for row in range(height):
      # do for every pixel
      if mask[col, row] == 255:
        # avoid division by zero
        blend[col, row] = 255
      else:
        # shift image pixel value by 8 bits
        # divide by the inverse of the mask
        tmp = (image[col, row] << 8) / (255 - mask)
        # print(\'tmp={}\'.format(tmp.shape))
        # make sure resulting value stays within bounds
        if tmp.any() > 255:
          tmp = 255
          blend[col, row] = tmp

  return blend


def dodgeV2(image, mask):
  return cv2.divide(image, 255 - mask, scale=256)


def burnV2(image, mask):
  return 255 - cv2.divide(255 - image, 255 - mask, scale=256)


def rgb_to_sketch(src_image_name):
  print(\'转换中......\')
  img_rgb = cv2.imread(src_image_name)
  img_gray = cv2.cvtColor(img_rgb, cv2.COLOR_BGR2GRAY)
  # 读取图片时直接转换操作
  # img_gray = cv2.imread(\'example.jpg\', cv2.IMREAD_GRAYSCALE)

  img_gray_inv = 255 - img_gray
  img_blur = cv2.GaussianBlur(img_gray_inv, ksize=(21, 21),
                sigmaX=0, sigmaY=0)
  img_blend = dodgeV2(img_gray, img_blur)

  # cv2.imshow(\'original\', img_rgb)
  # cv2.imshow(\'gray\', img_gray)
  # cv2.imshow(\'gray_inv\', img_gray_inv)
  # cv2.imshow(\'gray_blur\', img_blur)
  cv2.imwrite(dst_image_name, img_blend)
  save_path = getcwd() + \"\\\\\" + dst_image_name # 保存路径
  print(\'转换完成!!!\\n\')
  print(\'保存路径:\' + save_path)
  cv2.imshow(save_path, img_blend)
  cv2.waitKey(0)
  cv2.destroyAllWindows()


if __name__ == \'__main__\':
  print(\'请选择图片(路径不要含中文)：\')
  src_image_name = open_path() # 文件路径
  print(src_image_name + \'\\n\')
  image_name = \'\'.join(findall(r\'[^\\\\/:*?\"<>|\\r\\n]+$\', src_image_name)) # 获取文件名
  dst_image_name = \'Sketch_\' + image_name
  rgb_to_sketch(src_image_name)