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/*
* SPDX-FileCopyrightText: Copyright 2022 Arm Limited and/or its affiliates <open-source-office@arm.com>
* SPDX-License-Identifier: Apache-2.0
*
* 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.
*/
#ifndef IMAGE_UTILS_HPP
#define IMAGE_UTILS_HPP
#include <cstddef>
#include <cstdint>
#include <forward_list>
#include <vector>
/* Helper macro to convert RGB888 to RGB565 format. */
#define RGB888_TO_RGB565(R8,G8,B8) ((((R8>>3) & 0x1F) << 11) | \
(((G8>>2) & 0x3F) << 5) | \
((B8>>3) & 0x1F))
constexpr uint16_t COLOR_BLACK = 0;
constexpr uint16_t COLOR_GREEN = RGB888_TO_RGB565( 0, 255, 0); // 2016;
constexpr uint16_t COLOR_YELLOW = RGB888_TO_RGB565(255, 255, 0); // 65504;
namespace arm {
namespace app {
namespace image {
/**
* Contains the x,y co-ordinates of a box centre along with the box width and height.
*/
struct Box {
float x;
float y;
float w;
float h;
};
struct Detection {
Box bbox;
std::vector<float> prob;
float objectness;
};
/**
* @brief Calculate the 1D overlap.
* @param[in] x1Center First center point.
* @param[in] width1 First width.
* @param[in] x2Center Second center point.
* @param[in] width2 Second width.
* @return The overlap between the two lines.
**/
float Calculate1DOverlap(float x1Center, float width1, float x2Center, float width2);
/**
* @brief Calculate the intersection between the two given boxes.
* @param[in] box1 First box.
* @param[in] box2 Second box.
* @return The intersection value.
**/
float CalculateBoxIntersect(Box& box1, Box& box2);
/**
* @brief Calculate the union between the two given boxes.
* @param[in] box1 First box.
* @param[in] box2 Second box.
* @return The two given boxes union value.
**/
float CalculateBoxUnion(Box& box1, Box& box2);
/**
* @brief Calculate the intersection over union between the two given boxes.
* @param[in] box1 First box.
* @param[in] box2 Second box.
* @return The intersection over union value.
**/
float CalculateBoxIOU(Box& box1, Box& box2);
/**
* @brief Calculate the Non-Maxima suppression on the given detection boxes.
* @param[in] detections List of Detection boxes.
* @param[in] classes Number of classes.
* @param[in] iouThreshold Intersection over union threshold.
**/
void CalculateNMS(std::forward_list<Detection>& detections, int classes, float iouThreshold);
/**
* @brief Helper function to convert a UINT8 image to INT8 format.
* @param[in,out] data Pointer to the data start.
* @param[in] kMaxImageSize Total number of pixels in the image.
**/
void ConvertImgToInt8(void* data, size_t kMaxImageSize);
/**
* @brief Converts RGB image to grayscale.
* @param[in] srcPtr Pointer to RGB source image.
* @param[out] dstPtr Pointer to grayscale destination image.
* @param[in] imgSz Destination image size.
**/
void RgbToGrayscale(const uint8_t* srcPtr, uint8_t* dstPtr, size_t dstImgSz);
} /* namespace image */
} /* namespace app */
} /* namespace arm */
#endif /* IMAGE_UTILS_HPP */
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