代码收藏家技术教程 2022-07-25

Python实现照片卡通化，一拳打破次元壁 | 机器学习

前言

接着我上一篇开源机器学习的使用：如何将照片变成卡通图，animegan2-pytorch机器学习项目使用 | 机器学习_阿良的博客-CSDN博客

我还是继续把项目稍微魔改一下，依然变为一个python文件就可以执行单一图片的处理。变为可以直接拿去使用的工具。

项目github地址：github地址

项目结构

samples目录里面有一些样例图片，可以测试用。weights目录放了原项目的4个模型。python环境需要安装一些依赖，主要是pytorch。pytorch的环境安装可以参考我的另一篇文章：机器学习基础环境部署 | 机器学习系列_阿良的博客-CSDN博客

核心代码

不废话，上核心代码了。

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2021/12/4 22:34
# @Author  : 剑客阿良_ALiang
# @Site    : 
# @File    : image_cartoon_tool.py

from PIL import Image
import torch
from torchvision.transforms.functional import to_tensor, to_pil_image
from torch import nn
import os
import torch.nn.functional as F
import uuid


# -------------------------- hy add 01 --------------------------
class ConvNormLReLU(nn.Sequential):
    def __init__(self, in_ch, out_ch, kernel_size=3, stride=1, padding=1, pad_mode="reflect", groups=1, bias=False):
        pad_layer = {
            "zero": nn.ZeroPad2d,
            "same": nn.ReplicationPad2d,
            "reflect": nn.ReflectionPad2d,
        }
        if pad_mode not in pad_layer:
            raise NotImplementedError

        super(ConvNormLReLU, self).__init__(
            pad_layer[pad_mode](padding),
            nn.Conv2d(in_ch, out_ch, kernel_size=kernel_size, stride=stride, padding=0, groups=groups, bias=bias),
            nn.GroupNorm(num_groups=1, num_channels=out_ch, affine=True),
            nn.LeakyReLU(0.2, inplace=True)
        )


class InvertedResBlock(nn.Module):
    def __init__(self, in_ch, out_ch, expansion_ratio=2):
        super(InvertedResBlock, self).__init__()

        self.use_res_connect = in_ch == out_ch
        bottleneck = int(round(in_ch * expansion_ratio))
        layers = []
        if expansion_ratio != 1:
            layers.append(ConvNormLReLU(in_ch, bottleneck, kernel_size=1, padding=0))

        # dw
        layers.append(ConvNormLReLU(bottleneck, bottleneck, groups=bottleneck, bias=True))
        # pw
        layers.append(nn.Conv2d(bottleneck, out_ch, kernel_size=1, padding=0, bias=False))
        layers.append(nn.GroupNorm(num_groups=1, num_channels=out_ch, affine=True))

        self.layers = nn.Sequential(*layers)

    def forward(self, input):
        out = self.layers(input)
        if self.use_res_connect:
            out = input + out
        return out


class Generator(nn.Module):
    def __init__(self, ):
        super().__init__()

        self.block_a = nn.Sequential(
            ConvNormLReLU(3, 32, kernel_size=7, padding=3),
            ConvNormLReLU(32, 64, stride=2, padding=(0, 1, 0, 1)),
            ConvNormLReLU(64, 64)
        )

        self.block_b = nn.Sequential(
            ConvNormLReLU(64, 128, stride=2, padding=(0, 1, 0, 1)),
            ConvNormLReLU(128, 128)
        )

        self.block_c = nn.Sequential(
            ConvNormLReLU(128, 128),
            InvertedResBlock(128, 256, 2),
            InvertedResBlock(256, 256, 2),
            InvertedResBlock(256, 256, 2),
            InvertedResBlock(256, 256, 2),
            ConvNormLReLU(256, 128),
        )

        self.block_d = nn.Sequential(
            ConvNormLReLU(128, 128),
            ConvNormLReLU(128, 128)
        )

        self.block_e = nn.Sequential(
            ConvNormLReLU(128, 64),
            ConvNormLReLU(64, 64),
            ConvNormLReLU(64, 32, kernel_size=7, padding=3)
        )

        self.out_layer = nn.Sequential(
            nn.Conv2d(32, 3, kernel_size=1, stride=1, padding=0, bias=False),
            nn.Tanh()
        )

    def forward(self, input, align_corners=True):
        out = self.block_a(input)
        half_size = out.size()[-2:]
        out = self.block_b(out)
        out = self.block_c(out)

        if align_corners:
            out = F.interpolate(out, half_size, mode="bilinear", align_corners=True)
        else:
            out = F.interpolate(out, scale_factor=2, mode="bilinear", align_corners=False)
        out = self.block_d(out)

        if align_corners:
            out = F.interpolate(out, input.size()[-2:], mode="bilinear", align_corners=True)
        else:
            out = F.interpolate(out, scale_factor=2, mode="bilinear", align_corners=False)
        out = self.block_e(out)

        out = self.out_layer(out)
        return out


# -------------------------- hy add 02 --------------------------

def load_image(image_path, x32=False):
    img = Image.open(image_path).convert("RGB")

    if x32:
        def to_32s(x):
            return 256 if x < 256 else x - x % 32

        w, h = img.size
        img = img.resize((to_32s(w), to_32s(h)))

    return img


def handle(image_path: str, output_dir: str, type: int, device='cpu'):
    _ext = os.path.basename(image_path).strip().split('.')[-1]
    if type == 1:
        _checkpoint = './weights/paprika.pt'
    elif type == 2:
        _checkpoint = './weights/face_paint_512_v2.pt'
    else:
        raise Exception('type not support')
    os.makedirs(output_dir, exist_ok=True)
    net = Generator()
    net.load_state_dict(torch.load(_checkpoint, map_location="cpu"))
    net.to(device).eval()
    image = load_image(image_path)

    with torch.no_grad():
        image = to_tensor(image).unsqueeze(0) * 2 - 1
        out = net(image.to(device), False).cpu()
        out = out.squeeze(0).clip(-1, 1) * 0.5 + 0.5
        out = to_pil_image(out)
    result = os.path.join(output_dir, '{}.{}'.format(uuid.uuid1().hex, _ext))
    out.save(result)
    return result


if __name__ == '__main__':
    print(handle('samples/images/fengjing.jpg', 'samples/images_result/', 1))
    print(handle('samples/images/renxiang.jpg', 'samples/images_result/', 2))

代码说明

1、handle方法可以将一张图片变为卡通化图片，入参为：图片路径、输出目录、类型（1为景色类型图片、2为人物人像图片）、设备类型（默认cpu，可以选择cuda）

2、按照我上一篇文章的测试，适合风景的模型和适合人像的模型不太一样，所以做了区分。

3、输出结果图片名字为了不重复，使用uuid。

验证一下

先发一下准备的图片