preprocessor.h

// Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#pragma once
#include "fastdeploy/vision/common/processors/transform.h"
#include "fastdeploy/vision/common/result.h"

namespace fastdeploy {
namespace vision {

namespace detection {
class FASTDEPLOY_DECL YOLOv5Preprocessor {
 public:
  YOLOv5Preprocessor();

  bool Run(std::vector<FDMat>* images, std::vector<FDTensor>* outputs,
           std::vector<std::map<std::string, std::array<float, 2>>>* ims_info);

  void SetSize(const std::vector<int>& size) { size_ = size; }

  std::vector<int> GetSize() const { return size_; }

  void SetPaddingValue(const std::vector<float>& padding_value) {
    padding_value_ = padding_value;
  }

  std::vector<float> GetPaddingValue() const { return padding_value_; }

  void SetScaleUp(bool is_scale_up) {
    is_scale_up_ = is_scale_up;
  }

  bool GetScaleUp() const { return is_scale_up_; }

  void SetMiniPad(bool is_mini_pad) {
    is_mini_pad_ = is_mini_pad;
  }

  bool GetMiniPad() const { return is_mini_pad_; }

  void SetStride(int stride) {
    stride_ = stride;
  }

  bool GetStride() const { return stride_; }

 protected:
  bool Preprocess(FDMat* mat, FDTensor* output,
                  std::map<std::string, std::array<float, 2>>* im_info);

  void LetterBox(FDMat* mat);

  // target size, tuple of (width, height), default size = {640, 640}
  std::vector<int> size_;

  // padding value, size should be the same as channels
  std::vector<float> padding_value_;

  // only pad to the minimum rectange which height and width is times of stride
  bool is_mini_pad_;

  // while is_mini_pad = false and is_no_pad = true,
  // will resize the image to the set size
  bool is_no_pad_;

  // if is_scale_up is false, the input image only can be zoom out,
  // the maximum resize scale cannot exceed 1.0
  bool is_scale_up_;

  // padding stride, for is_mini_pad
  int stride_;

  // for offseting the boxes by classes when using NMS
  float max_wh_;
};

}  // namespace detection
}  // namespace vision
}  // namespace fastdeploy