rk1126, 实现 yolov8 目标检测-编程知识

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基于 RKNN 1126 实现 yolov8 目标检测

Ⓜ️ RKNN 模型转换

ONNX

yolo export model=./weights/yolov8s.pt format=onnx

导出 RKNN

这里选择输出 concat 输入两个节点 onnx::Concat_425 和 onnx::Concat_426

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from rknn.api import RKNNONNX_MODEL = './weights/yolov8s.onnx'RKNN_MODEL = './weights/yolov8s.rknn'QUA_DATASETS = './data/coco/datasets.txt'QUA_DATASETS_analysis = './data/coco/images/datasets_ans.txt'QUANTIZE_ON = Trueif __name__ == '__main__':# Create RKNN objectrknn = RKNN(verbose=True)# pre-process config  # asymmetric_affine-u8, dynamic_fixed_point-i8, dynamic_fixed_point-i16print('--> config model')rknn.config(reorder_channel='0 1 2',mean_values=[[0, 0, 0]],std_values=[[255, 255, 255]],quantized_algorithm="normal",optimization_level=3,target_platform = 'rk1126',quantize_input_node= QUANTIZE_ON,quantized_dtype='asymmetric_quantized-u8',batch_size = 64,force_builtin_perm = False)print('done')print('--> Loading model')ret = rknn.load_onnx(model=ONNX_MODEL, outputs=['onnx::Concat_425', 'onnx::Concat_426'])if ret != 0:print('Load model  failed!')exit(ret)print('done')# Build modelprint('--> Building model')ret = rknn.build(do_quantization=QUANTIZE_ON, dataset=QUA_DATASETS,pre_compile=True)  # ,pre_compile=Trueif ret != 0:print('Build occ_model failed!')exit(ret)print('done')# Export rknn modelprint('--> Export RKNN model')ret = rknn.export_rknn(RKNN_MODEL)if ret != 0:print('Export occ_model failed!')exit(ret)print('done')

🚀 RKNN板子上推理

前处理，为了简单方便直接 resize

cv::Mat resize_img(INPUT_H, INPUT_W, CV_8UC3);
cv::resize(src, resize_img, resize_img.size(), 0, 0, cv::INTER_LINEAR);
cv::Mat pr_img;
cvtColor(resize_img, pr_img, COLOR_BGR2RGB);

模型推理

/* Init input tensor */
rknn_input inputs[1];
memset(inputs, 0, sizeof(inputs));
inputs[0].index = 0;
inputs[0].buf = pr_img.data;
// inputs[0].buf = input_data;
inputs[0].type = RKNN_TENSOR_UINT8;
inputs[0].size = input_width * input_height * input_channel;
inputs[0].fmt = RKNN_TENSOR_NHWC;
inputs[0].pass_through = 0;// printf("img.cols: %d, img.rows: %d\n", pr_img.cols, pr_img.rows);
printf("input io_num: %d, output io_num: %d\n", io_num.n_input, io_num.n_output);
auto t1 = std::chrono::steady_clock::now();
rknn_inputs_set(ctx, io_num.n_input, inputs);
std::cout << "rknn_inputs_set time: " << std::chrono::duration_cast<std::chrono::duration<double>>(std::chrono::steady_clock::now() - t1).count() * 1000 << " ms." << std::endl;
ret = rknn_run(ctx, NULL);
std::cout << "rknn_run time: " << std::chrono::duration_cast<std::chrono::duration<double>>(std::chrono::steady_clock::now() - t1).count() * 1000 << " ms." << std::endl;
if (ret < 0)
{printf("ctx error ret=%d\n", ret);return -1;
}/* Init output tensor */
rknn_output outputs[io_num.n_output];
memset(outputs, 0, sizeof(outputs));
for (int i = 0; i < io_num.n_output; i++)
{outputs[i].want_float = 1;
}
ret = rknn_outputs_get(ctx, io_num.n_output, outputs, NULL);
if (ret < 0)
{printf("outputs error ret=%d\n", ret);return -1;
}

后处理

导出模型没有进行 concat 操作，所以自行处理.

cv::Mat out_buffer0_mat;
std::vector<Mat> vImgs;
cv::Mat out0_mat = cv::Mat(4, Num_box, CV_32F, (float*)outputs[0].buf);
cv::Mat out1_mat = cv::Mat(CLASSES, Num_box, CV_32F, (float*)outputs[1].buf);
vImgs.push_back(out0_mat);       // 4 * 8400
vImgs.push_back(out1_mat);       // CLASSES * 8400
vconcat(vImgs, out_buffer0_mat); // 垂直方向拼接  (CLASSES + 4) * 8400

后处理

std::vector<Detection> detections; // 结果id数组std::vector<int> classIds;      // 结果id数组
std::vector<float> confidences; // 结果每个id对应置信度数组
std::vector<cv::Rect> boxes;    // 每个id矩形框
auto start = std::chrono::system_clock::now();
for (int i = 0; i < Num_box; i++)
{// 输出是1*net_length*Num_box;所以每个box的属性是每隔Num_box取一个值，共net_length个值cv::Mat scores = out_buffer0_mat(Rect(i, 4, 1, CLASSES)).clone();Point classIdPoint;Point minclassIdPoint;double max_class_socre;double min_class_socre;minMaxLoc(scores, &min_class_socre, &max_class_socre, &minclassIdPoint, &classIdPoint);// if (max_class_socre > CONF_THRESHOLD)//     std::cout << "max_class_socre:" << max_class_socre << std::endl;max_class_socre = (float)max_class_socre;if (max_class_socre >= CONF_THRESHOLD){float x = (out_buffer0_mat.at<float>(0, i)) * ratio_w; // cxfloat y = (out_buffer0_mat.at<float>(1, i)) * ratio_h; // cyfloat w = out_buffer0_mat.at<float>(2, i) * ratio_w;   // wfloat h = out_buffer0_mat.at<float>(3, i) * ratio_h;   // hint left = MAX((x - 0.5 * w), 0);int top = MAX((y - 0.5 * h), 0);int width = (int)w;int height = (int)h;if (width <= 0 || height <= 0)continue;printf("====> id: %d \n", classIdPoint.y);classIds.push_back(classIdPoint.y);confidences.push_back(max_class_socre);boxes.push_back(Rect(left, top, width, height));}
}// 执行非最大抑制以消除具有较低置信度的冗余重叠框（NMS）![在这里插入图片描述](https://img-blog.csdnimg.cn/direct/a9897fddb01642358b2a9047ccd98067.jpeg#pic_center)std::vector<int> nms_result;
cv::dnn::NMSBoxes(boxes, confidences, CONF_THRESHOLD, NMS_THRESHOLD, nms_result);std::cout << ">>>>> nms_result: " << boxes.size() << " " << nms_result.size() << std::endl;for (int i = 0; i < nms_result.size(); ++i)
{Detection detection;int idx = nms_result[i];detection.class_id = classIds[idx];detection.conf = confidences[idx];detection.box = boxes[idx];detections.push_back(detection);
}