source/PaddleOCR/deploy/lite/cls_process.cc

// Copyright (c) 2020 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.

#include "cls_process.h" //NOLINT
#include <algorithm>
#include <memory>
#include <string>

const std::vector<int> rec_image_shape{3, 48, 192};

cv::Mat ClsResizeImg(cv::Mat img) {
  int imgC, imgH, imgW;
  imgC = rec_image_shape[0];
  imgH = rec_image_shape[1];
  imgW = rec_image_shape[2];

  float ratio = static_cast<float>(img.cols) / static_cast<float>(img.rows);

  int resize_w, resize_h;
  if (ceilf(imgH * ratio) > imgW)
    resize_w = imgW;
  else
    resize_w = int(ceilf(imgH * ratio));
  cv::Mat resize_img;
  cv::resize(img, resize_img, cv::Size(resize_w, imgH), 0.f, 0.f,
             cv::INTER_LINEAR);
  if (resize_w < imgW) {
    cv::copyMakeBorder(resize_img, resize_img, 0, 0, 0, imgW - resize_w,
                       cv::BORDER_CONSTANT, cv::Scalar(0, 0, 0));
  }
  return resize_img;
}