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-# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserve.
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-#
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-#Licensed under the Apache License, Version 2.0 (the "License");
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-#you may not use this file except in compliance with the License.
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-#You may obtain a copy of the License at
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-#
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-# http://www.apache.org/licenses/LICENSE-2.0
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-#
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-#Unless required by applicable law or agreed to in writing, software
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-#distributed under the License is distributed on an "AS IS" BASIS,
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-#WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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-#See the License for the specific language governing permissions and
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-#limitations under the License.
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-
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-import os
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-import numpy as np
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-from PIL import Image
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-
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-import paddle
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-from ppgan.models.generators import PAN
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-from ppgan.utils.download import get_path_from_url
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-from ppgan.utils.logger import get_logger
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-
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-from .base_predictor import BasePredictor
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-
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-REALSR_WEIGHT_URL = 'https://paddlegan.bj.bcebos.com/models/pan_x4.pdparams'
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-
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-
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-class PANPredictor(BasePredictor):
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- def __init__(self, output='output', weight_path=None):
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- self.input = input
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- self.output = os.path.join(output,
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- 'PAN') #定义超分的结果保存的路径,为output路径+模型名所在文件夹
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- self.model = PAN(3, 3, 40, 24, 16) # 实例化模型
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- if weight_path is None:
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- weight_path = get_path_from_url(REALSR_WEIGHT_URL)
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- state_dict = paddle.load(weight_path) #加载权重
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- state_dict = state_dict['generator']
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- self.model.load_dict(state_dict)
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- self.model.eval()
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-
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- # 标准化
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- def norm(self, img):
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- img = np.array(img).transpose([2, 0, 1]).astype('float32') / 255.0
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- return img.astype('float32')
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-
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- # 去标准化
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- def denorm(self, img):
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- img = img.transpose((1, 2, 0))
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- return (img * 255).clip(0, 255).astype('uint8')
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-
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- # 对图片输入进行预测,输入可以是图像路径,也可以是cv2读取的矩阵,或者PIL读取的图像文件
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- def run_image(self, img):
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- if isinstance(img, str):
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- ori_img = Image.open(img).convert('RGB')
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- elif isinstance(img, np.ndarray):
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- ori_img = Image.fromarray(img).convert('RGB')
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- elif isinstance(img, Image.Image):
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- ori_img = img
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-
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- img = self.norm(ori_img) #图像标准化
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- x = paddle.to_tensor(img[np.newaxis, ...]) #转成tensor
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- with paddle.no_grad():
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- out = self.model(x)
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-
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- pred_img = self.denorm(out.numpy()[0]) #tensor转成numpy的array并去标准化
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- pred_img = Image.fromarray(pred_img) # array转图像
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- return pred_img
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-
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- #输入图像文件路径
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- def run(self, input):
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- # 如果输出路径不存在则新建一个
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- if not os.path.exists(self.output):
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- os.makedirs(self.output)
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-
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- pred_img = self.run_image(input) #对输入的图片进行预测
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- out_path = None
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- if self.output:
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- try:
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- base_name = os.path.splitext(os.path.basename(input))[0]
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- except:
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- base_name = 'result'
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- out_path = os.path.join(self.output, base_name + '.png') #保存路径
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- pred_img.save(out_path) #保存输出图片
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- logger = get_logger()
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- logger.info('Image saved to {}'.format(out_path))
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-
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- return pred_img, out_path
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