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# DiffBIR
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## 论文
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**DiffBIR: Towards Blind Image Restoration with Generative Diffusion Prior**
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* https://arxiv.org/abs/2308.15070
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## 模型结构
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第一阶段模型使用8个Swin Transformer blocks(RSTB),每个RSTB中包含6个Swin Transformer Layers(STL),其中head数为6,window size为8.
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第二阶段模型基于Stable Diffusioin 2.1-base,创建了一个与Unet中encoder block与middle block相同的网络。
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![Alt text](images/image.png)
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## 算法原理
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用途:该算法为两阶段算法,可以提升图像的分辨率。
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第一阶段使用复原模块,从具有未知和复杂降质的低质量(LQ)图像中恢复清晰图像;
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![Alt text](images/s1.png)

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第二阶段使用生成模块来重新生成丢失的信息。
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![Alt text](images/s2.png)

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## 环境配置
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### Docker(方法一)
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    # 需要在对应的目录下
    docker build -t <IMAGE_NAME>:<TAG> .
    # <your IMAGE ID>用以上拉取的docker的镜像ID替换
    docker run -it --shm-size 10g --network=host --name=diffbir --privileged --device=/dev/kfd --device=/dev/dri --group-add video --cap-add=SYS_PTRACE --security-opt seccomp=unconfined <your IMAGE ID> bash
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### Docker(方法二)

    docker pull image.sourcefind.cn:5000/dcu/admin/base/pytorch:1.13.1-centos7.6-dtk-23.04.1-py39-latest
    docker run --shm-size 10g --network=host --name=diffbir --privileged --device=/dev/kfd --device=/dev/dri --group-add video --cap-add=SYS_PTRACE --security-opt seccomp=unconfined -v 项目地址(绝对路径):/home/ -it <your IMAGE ID> bash
    pip install -r requirements.txt


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### Anaconda (方法三)
1、关于本项目DCU显卡所需的特殊深度学习库可从光合开发者社区下载安装:
https://developer.hpccube.com/tool/
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    DTK驱动:dtk23.04.1
    python:python3.9
    torch:1.13.1
    torchvision:0.14.1
    torchaudio:0.13.1
    deepspeed:0.9.2
    apex:0.1
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Tips:以上dtk驱动、python、torch等DCU相关工具版本需要严格一一对应
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2、其它非特殊库参照requirements.txt安装
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    pip install -r requirements.txt
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## 数据集
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下载地址(训练+测试集):https://www.image-net.org/ (imagenet1k)
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    datasets
        |- train
            |- n01440764
                |- xxx.JPEG
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下载地址(训练+测试集):https://www.robots.ox.ac.uk/~vgg/data/pets/

    datasets
        |- images
            |- xxx.JPG

注意:以上两个数据集都可以使用,可任选其一。
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## 训练
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### 阶段一
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1、数据准备:该操作用于生成训练以及验证数据路径列表

    python scripts/make_file_list.py \  
    --img_folder [hq_dir_path] \         # 包含图片的文件夹
    --val_size [validation_set_size] \   # 验证集大小
    --save_folder [save_dir_path] \      # 路径列表保存文件夹
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    --follow_links
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2、修改配置文件

    修改 `configs/dataset`中相应的yaml配置文件
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    修改 `configs/train_swinir.yaml`配置文件
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注意:在修改`configs/dataset`中的配置文件时,可以选择修改"realesrgan"或"codeformer"中的任意一个。
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3、训练

    python train.py --config [training_config_path]
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注意:该阶段训练得到的模型将用于第二阶段的训练。
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### 阶段二
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1、模型准备(Stable Diffusion v2.1): https://huggingface.co/stabilityai/stable-diffusion-2-1-base/resolve/main/v2-1_512-ema-pruned.ckpt
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2、初始化模型参数

    python scripts/make_stage2_init_weight.py \
    --cldm_config configs/model/cldm.yaml \
    --sd_weight [sd_v2.1_ckpt_path] \
    --swinir_weight [swinir_ckpt_path] \  # 第一阶段训练得到的模型
    --output [init_weight_output_path]    # 初始化模型保存地址

3、修改配置文件

    修改`configs/train_cldm.yaml`配置文件

4、训练
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    python train.py --config [training_config_path]

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## 推理
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### general Image
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模型下载地址:
* https://huggingface.co/lxq007/DiffBIR/resolve/main/general_full_v1.ckpt
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* https://huggingface.co/lxq007/DiffBIR/resolve/main/general_swinir_v1.ckpt
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        python inference.py \
        --input inputs/demo/general \
        --config configs/model/cldm.yaml \
        --ckpt weights/general_full_v1.ckpt \  
        --reload_swinir --swinir_ckpt weights/general_swinir_v1.ckpt \  
        --steps 50 \
        --sr_scale 4 \
        --color_fix_type wavelet \
        --output results/demo/general \
        --device cuda [--tiled --tile_size 512 --tile_stride 256]
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注意:方括号中的参数为可选项,模型也可以替换为在训练阶段得到的
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### Face Image
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模型下载地址:
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* https://huggingface.co/lxq007/DiffBIR/resolve/main/face_full_v1.ckpt
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for aligned face inputs
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    python inference_face.py \
    --input inputs/demo/face/aligned \
    --sr_scale 1 \
    --output results/demo/face/aligned \
    --has_aligned \
    --device cuda

for unaligned face inputs

    python inference_face.py \
    --input inputs/demo/face/whole_img \
    --sr_scale 2 \
    --output results/demo/face/whole_img \
    --bg_upsampler DiffBIR \
    --device cuda

## result

恢复后的图像

![Alt text](images/samples_step-004900_e-000008_b-001203.png)

低质量图像

![Alt text](images/lq_step-004900_e-000008_b-001203.png)

### 精度



## 应用场景
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### 算法类别
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`图像超分`
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### 热点应用行业
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`媒体,科研,教育`
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## 源码仓库及问题反馈
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https://developer.hpccube.com/codes/modelzoo/diffbir_pytorch
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## 参考资料
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* https://github.com/XPixelGroup/DiffBIR
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* https://github.com/XPixelGroup/DiffBIR/issues/55