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// 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 <string>
#include <thread>
#include <vector>
#include "include/preprocess_op.h"
namespace PaddleDetection {
void InitInfo::Run(cv::Mat* im, ImageBlob* data) {
data->im_shape_ = {static_cast<float>(im->rows),
static_cast<float>(im->cols)};
data->scale_factor_ = {1., 1.};
data->in_net_shape_ = {static_cast<float>(im->rows),
static_cast<float>(im->cols)};
}
void NormalizeImage::Run(cv::Mat* im, ImageBlob* data) {
double e = 1.0;
if (is_scale_) {
e /= 255.0;
}
(*im).convertTo(*im, CV_32FC3, e);
for (int h = 0; h < im->rows; h++) {
for (int w = 0; w < im->cols; w++) {
im->at<cv::Vec3f>(h, w)[0] =
(im->at<cv::Vec3f>(h, w)[0] - mean_[0]) / scale_[0];
im->at<cv::Vec3f>(h, w)[1] =
(im->at<cv::Vec3f>(h, w)[1] - mean_[1]) / scale_[1];
im->at<cv::Vec3f>(h, w)[2] =
(im->at<cv::Vec3f>(h, w)[2] - mean_[2]) / scale_[2];
}
}
}
void Permute::Run(cv::Mat* im, ImageBlob* data) {
(*im).convertTo(*im, CV_32FC3);
int rh = im->rows;
int rw = im->cols;
int rc = im->channels();
(data->im_data_).resize(rc * rh * rw);
float* base = (data->im_data_).data();
for (int i = 0; i < rc; ++i) {
cv::extractChannel(*im, cv::Mat(rh, rw, CV_32FC1, base + i * rh * rw), i);
}
}
void Resize::Run(cv::Mat* im, ImageBlob* data) {
auto resize_scale = GenerateScale(*im);
data->im_shape_ = {static_cast<float>(im->cols * resize_scale.first),
static_cast<float>(im->rows * resize_scale.second)};
data->in_net_shape_ = {static_cast<float>(im->cols * resize_scale.first),
static_cast<float>(im->rows * resize_scale.second)};
cv::resize(
*im, *im, cv::Size(), resize_scale.first, resize_scale.second, interp_);
data->im_shape_ = {
static_cast<float>(im->rows), static_cast<float>(im->cols),
};
data->scale_factor_ = {
resize_scale.second, resize_scale.first,
};
}
std::pair<float, float> Resize::GenerateScale(const cv::Mat& im) {
std::pair<float, float> resize_scale;
int origin_w = im.cols;
int origin_h = im.rows;
if (keep_ratio_) {
int im_size_max = std::max(origin_w, origin_h);
int im_size_min = std::min(origin_w, origin_h);
int target_size_max =
*std::max_element(target_size_.begin(), target_size_.end());
int target_size_min =
*std::min_element(target_size_.begin(), target_size_.end());
float scale_min =
static_cast<float>(target_size_min) / static_cast<float>(im_size_min);
float scale_max =
static_cast<float>(target_size_max) / static_cast<float>(im_size_max);
float scale_ratio = std::min(scale_min, scale_max);
resize_scale = {scale_ratio, scale_ratio};
} else {
resize_scale.first =
static_cast<float>(target_size_[1]) / static_cast<float>(origin_w);
resize_scale.second =
static_cast<float>(target_size_[0]) / static_cast<float>(origin_h);
}
return resize_scale;
}
void LetterBoxResize::Run(cv::Mat* im, ImageBlob* data) {
float resize_scale = GenerateScale(*im);
int new_shape_w = std::round(im->cols * resize_scale);
int new_shape_h = std::round(im->rows * resize_scale);
data->im_shape_ = {static_cast<float>(new_shape_h),
static_cast<float>(new_shape_w)};
float padw = (target_size_[1] - new_shape_w) / 2.;
float padh = (target_size_[0] - new_shape_h) / 2.;
int top = std::round(padh - 0.1);
int bottom = std::round(padh + 0.1);
int left = std::round(padw - 0.1);
int right = std::round(padw + 0.1);
cv::resize(
*im, *im, cv::Size(new_shape_w, new_shape_h), 0, 0, cv::INTER_AREA);
data->in_net_shape_ = {
static_cast<float>(im->rows), static_cast<float>(im->cols),
};
cv::copyMakeBorder(*im,
*im,
top,
bottom,
left,
right,
cv::BORDER_CONSTANT,
cv::Scalar(127.5));
data->in_net_shape_ = {
static_cast<float>(im->rows), static_cast<float>(im->cols),
};
data->scale_factor_ = {
resize_scale, resize_scale,
};
}
float LetterBoxResize::GenerateScale(const cv::Mat& im) {
int origin_w = im.cols;
int origin_h = im.rows;
int target_h = target_size_[0];
int target_w = target_size_[1];
float ratio_h = static_cast<float>(target_h) / static_cast<float>(origin_h);
float ratio_w = static_cast<float>(target_w) / static_cast<float>(origin_w);
float resize_scale = std::min(ratio_h, ratio_w);
return resize_scale;
}
void PadStride::Run(cv::Mat* im, ImageBlob* data) {
if (stride_ <= 0) {
return;
}
int rc = im->channels();
int rh = im->rows;
int rw = im->cols;
int nh = (rh / stride_) * stride_ + (rh % stride_ != 0) * stride_;
int nw = (rw / stride_) * stride_ + (rw % stride_ != 0) * stride_;
cv::copyMakeBorder(
*im, *im, 0, nh - rh, 0, nw - rw, cv::BORDER_CONSTANT, cv::Scalar(0));
data->in_net_shape_ = {
static_cast<float>(im->rows), static_cast<float>(im->cols),
};
}
// Preprocessor op running order
const std::vector<std::string> Preprocessor::RUN_ORDER = {"InitInfo",
"Resize",
"LetterBoxResize",
"NormalizeImage",
"PadStride",
"Permute"};
void Preprocessor::Run(cv::Mat* im, ImageBlob* data) {
for (const auto& name : RUN_ORDER) {
if (ops_.find(name) != ops_.end()) {
ops_[name]->Run(im, data);
}
}
}
} // namespace PaddleDetection
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