nanodet.h

// Tencent is pleased to support the open source community by making ncnn available.
//
// Copyright (C) 2021 THL A29 Limited, a Tencent company. All rights reserved.
//
// Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
//
// https://opensource.org/licenses/BSD-3-Clause
//
// 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 NANODET_H
#define NANODET_H

#include <net.h>
#include <simpleocv.h>

struct Object
{
    cv::Rect_<float> rect;
    int label;
    float prob;
};

class NanoDet
{
public:
    NanoDet();

    int load(const char* modeltype, bool use_gpu = false);

    int detect(const cv::Mat& rgba, std::vector<Object>& objects, float prob_threshold = 0.4f, float nms_threshold = 0.5f);

    int draw(cv::Mat& rgba, const std::vector<Object>& objects);

private:
    ncnn::Net nanodet;
    int target_size = 416;
    std::vector<int> strides = {8, 16, 32, 64};
    std::vector<std::string> class_names{
        "person", "bicycle", "car", "motorcycle", "airplane", "bus",
        "train", "truck", "boat", "traffic light", "fire hydrant",
        "stop sign", "parking meter", "bench", "bird", "cat", "dog",
        "horse", "sheep", "cow", "elephant", "bear", "zebra", "giraffe",
        "backpack", "umbrella", "handbag", "tie", "suitcase", "frisbee",
        "skis", "snowboard", "sports ball", "kite", "baseball bat",
        "baseball glove", "skateboard", "surfboard", "tennis racket",
        "bottle", "wine glass", "cup", "fork", "knife", "spoon", "bowl",
        "banana", "apple", "sandwich", "orange", "broccoli", "carrot",
        "hot dog", "pizza", "donut", "cake", "chair", "couch",
        "potted plant", "bed", "dining table", "toilet", "tv", "laptop",
        "mouse", "remote", "keyboard", "cell phone", "microwave", "oven",
        "toaster", "sink", "refrigerator", "book", "clock", "vase",
        "scissors", "teddy bear", "hair drier", "toothbrush"};
    float mean_vals[3] = {103.53f, 116.28f, 123.675f};
    float norm_vals[3] = {1.f / 57.375f, 1.f / 57.12f, 1.f / 58.395f};
    ncnn::UnlockedPoolAllocator blob_pool_allocator;
    ncnn::PoolAllocator workspace_pool_allocator;
};

#endif // NANODET_H