docs: Update README and compilation guides for clarity and consistency, including path corrections and improved formatting. Add copyright notices to source files and adjust file permissions for several scripts and directories.

examples/blazepose_detect/cpp/build-android.sh

@@ -0,0 +1,77 @@
+#!/bin/bash
+set -e
+
+#
+# Copyright (C) 2024–2025 Amlogic, Inc. 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.
+#
+
+usage() {
+    echo "Usage: $0 [-a <target_abi>]"
+    echo "  -a <target_abi> : Target ABI (default: arm64-v8a)"
+    echo "  -h              : Show this help message"
+    exit 1
+}
+
+# Default values
+TARGET_ABI=arm64-v8a
+
+# Parse arguments
+while getopts 'a:h' opt; do
+  case "$opt" in
+    a)
+      TARGET_ABI=$OPTARG
+      ;;
+    h)
+      usage
+      ;;
+    *)
+      usage
+      ;;
+  esac
+done
+
+if [ -z "${ANDROID_NDK_PATH}" ]; then
+    if [ -n "${ANDROID_NDK}" ]; then
+        ANDROID_NDK_PATH=${ANDROID_NDK}
+    elif [ -n "${ANDROID_NDK_HOME}" ]; then
+        ANDROID_NDK_PATH=${ANDROID_NDK_HOME}
+    else
+        echo "Error: ANDROID_NDK_PATH is not set."
+        echo "Please set ANDROID_NDK_PATH to your Android NDK directory."
+        exit 1
+    fi
+fi
+
+ROOT_PWD=$(cd "$(dirname $0)" && pwd)
+BUILD_DIR=${ROOT_PWD}/build/android
+
+echo "Building for Android..."
+echo "NDK_PATH: ${ANDROID_NDK_PATH}"
+echo "TARGET_ABI: ${TARGET_ABI}"
+echo "BUILD_DIR: ${BUILD_DIR}"
+
+mkdir -p ${BUILD_DIR}
+cd ${BUILD_DIR}
+
+cmake ../../src \
+    -DCMAKE_TOOLCHAIN_FILE=${ANDROID_NDK_PATH}/build/cmake/android.toolchain.cmake \
+    -DANDROID_ABI=${TARGET_ABI} \
+    -DANDROID_PLATFORM=android-24 \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DOpenCV_DIR=${ROOT_PWD}/../../../dependency/opencv/opencv-android-sdk-build/sdk/native/jni/abi-${TARGET_ABI}
+
+make -j4
+
+echo "Build complete. Executable in ${BUILD_DIR}/blazepose_detect_demo"

examples/blazepose_detect/cpp/build-linux.sh

@@ -0,0 +1,168 @@
+#!/bin/bash
+set -e
+
+#
+# Copyright (C) 2024–2025 Amlogic, Inc. 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.
+#
+
+usage() {
+    echo "Usage: $0 [-m <mode>] [-a <target_arch>] [-b <arch_bits>] [-s <yocto_sdk_root>] [-t <toolchain_file>]"
+    echo "  -m <mode>      : Build mode: 'linux' or 'yocto' (default: linux)"
+    echo "  -a <target>    : Target arch for linux mode (default: aarch64)"
+    echo "  -b <arch_bits> : Arch bits for yocto mode: 32 or 64 (default: 64)"
+    echo "  -s <sdk_root>  : Yocto SDK root path (overrides YOCTO_SDK_ROOT env var)"
+    echo "  -t <toolchain> : CMake toolchain file (overrides TOOLCHAIN_FILE env var)"
+    echo "  -h             : Show this help message"
+    exit 1
+}
+
+# Default values
+BUILD_MODE=linux
+TARGET_ARCH=aarch64
+ARCH_BITS=64
+CLI_SDK_ROOT=""
+CLI_TOOLCHAIN_FILE=""
+
+# Parse arguments
+while getopts 'm:a:b:s:t:h' opt; do
+  case "$opt" in
+    m)
+      BUILD_MODE=$OPTARG
+      ;;
+    a)
+      TARGET_ARCH=$OPTARG
+      ;;
+    b)
+      ARCH_BITS=$OPTARG
+      ;;
+    s)
+      CLI_SDK_ROOT=$OPTARG
+      ;;
+    t)
+      CLI_TOOLCHAIN_FILE=$OPTARG
+      ;;
+    h)
+      usage
+      ;;
+    *)
+      usage
+      ;;
+  esac
+done
+
+ROOT_PWD=$(cd "$(dirname $0)" && pwd)
+
+# ===========================================================================
+# Yocto build
+# ===========================================================================
+if [[ "${BUILD_MODE}" == "yocto" ]]; then
+
+    if [[ "${ARCH_BITS}" != "32" && "${ARCH_BITS}" != "64" ]]; then
+        echo "Unsupported ARCH_BITS \"${ARCH_BITS}\". Must be 32 or 64." >&2
+        exit 1
+    fi
+
+    # Configurable via environment variables (CLI args > env vars > defaults)
+    CMAKE_BIN="${CMAKE_BIN:-cmake}"
+    YOCTO_SDK_ROOT="${CLI_SDK_ROOT:-${YOCTO_SDK_ROOT:-/data/yuandian/tools/poky/4.0.20}}"
+    TOOLCHAIN_FILE="${CLI_TOOLCHAIN_FILE:-${TOOLCHAIN_FILE:-${ROOT_PWD}/../../cmake/yocto-toolchain.cmake}}"
+
+    # Export variables for CMake
+    export YOCTO_SDK_ROOT
+    export ARCH_BITS
+
+    BUILD_DIR="${ROOT_PWD}/build/yocto/${ARCH_BITS}"
+
+    echo "==> Building Yocto ${ARCH_BITS}-bit"
+    echo "    toolchain : ${TOOLCHAIN_FILE}"
+    echo "    SDK root  : ${YOCTO_SDK_ROOT}"
+    echo "    BUILD_DIR : ${BUILD_DIR}"
+
+    mkdir -p "${BUILD_DIR}"
+    rm -rf "${BUILD_DIR}"
+
+    # Select OpenCV based on target architecture
+    if [[ "${ARCH_BITS}" == "32" ]]; then
+        OPENCV_DIR="${ROOT_PWD}/../../../dependency/opencv/opencv-linux-armhf/share/OpenCV"
+    else
+        OPENCV_DIR="${ROOT_PWD}/../../../dependency/opencv/opencv-linux-aarch64/share/OpenCV"
+    fi
+
+    "${CMAKE_BIN}" \
+        -S "${ROOT_PWD}/src" \
+        -B "${BUILD_DIR}" \
+        -DCMAKE_TOOLCHAIN_FILE="${TOOLCHAIN_FILE}" \
+        -DYOCTO_SDK_ROOT="${YOCTO_SDK_ROOT}" \
+        -DARCH_BITS="${ARCH_BITS}" \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DOpenCV_DIR="${OPENCV_DIR}"
+
+    "${CMAKE_BIN}" --build "${BUILD_DIR}" --config Release
+
+    # Strip (best-effort)
+    HOST_SYSROOT="${YOCTO_SDK_ROOT}/sysroots/x86_64-pokysdk-linux"
+    if [[ "${ARCH_BITS}" == "32" ]]; then
+        CROSS_TRIPLE="arm-poky-linux-gnueabi"
+    else
+        CROSS_TRIPLE="aarch64-poky-linux"
+    fi
+    STRIP_TOOL="${HOST_SYSROOT}/usr/bin/${CROSS_TRIPLE}/${CROSS_TRIPLE}-strip"
+    if [[ -x "${STRIP_TOOL}" ]]; then
+        "${STRIP_TOOL}" --strip-unneeded "${BUILD_DIR}/blazepose_detect_demo"
+    else
+        echo "warning: strip tool not found; keeping debug info." >&2
+    fi
+
+    echo "Build complete. Executable in ${BUILD_DIR}/blazepose_detect_demo"
+    exit 0
+fi
+
+# ===========================================================================
+# Standard Linux cross-compile build
+# ===========================================================================
+
+# Default to aarch64-linux-gnu if GCC_COMPILER is not set
+GCC_COMPILER=${GCC_COMPILER:-aarch64-linux-gnu}
+
+# Set compilers
+export CC=${GCC_COMPILER}-gcc
+export CXX=${GCC_COMPILER}-g++
+
+# Validate compiler
+if ! command -v ${CC} &> /dev/null; then
+    echo "Error: Compiler ${CC} not found."
+    echo "Please set GCC_COMPILER environment variable to your cross-compiler path prefix."
+    echo "Example: export GCC_COMPILER=/path/to/toolchain/bin/aarch64-linux-gnu"
+    exit 1
+fi
+
+BUILD_DIR=${ROOT_PWD}/build/linux
+
+echo "Building for Linux..."
+echo "COMPILER: ${CC}"
+echo "TARGET_ARCH: ${TARGET_ARCH}"
+echo "BUILD_DIR: ${BUILD_DIR}"
+
+mkdir -p ${BUILD_DIR}
+cd ${BUILD_DIR}
+
+cmake ../../src \
+    -DCMAKE_SYSTEM_NAME=Linux \
+    -DCMAKE_SYSTEM_PROCESSOR=${TARGET_ARCH} \
+    -DCMAKE_BUILD_TYPE=Release
+
+make -j4
+
+echo "Build complete. Executable in ${BUILD_DIR}/blazepose_detect_demo"

examples/blazepose_detect/cpp/src/CMakeLists.txt

@@ -0,0 +1,36 @@
+cmake_minimum_required(VERSION 3.10...3.27)
+project(blazepose_detect_demo)
+
+set(CMAKE_CXX_STANDARD 17)
+
+list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/../../../../cmake")
+find_package(AMLNN REQUIRED)
+include_directories(${AMLNN_INCLUDE_DIR})
+link_directories(${AMLNN_LIBRARY_DIR})
+
+include_directories(${CMAKE_SOURCE_DIR}/../../../../common)
+
+# Set 3rdparty path
+set(3RDPARTY_DIR "${CMAKE_SOURCE_DIR}/../../../../dependency")
+
+if(CMAKE_SYSTEM_NAME STREQUAL "Android")
+    # Android needs log
+    link_libraries(log)
+endif()
+
+# Find OpenCV
+message(STATUS "OpenCV_DIR: ${OpenCV_DIR}")
+find_package(OpenCV REQUIRED)
+include_directories(${OpenCV_INCLUDE_DIRS})
+
+add_executable(blazepose_detect_demo
+    main.cpp
+    postprocess.cpp
+    postprocess.h
+    ${CMAKE_SOURCE_DIR}/../../../../common/model_loader.cpp
+)
+
+target_link_libraries(blazepose_detect_demo
+    ${OpenCV_LIBS}
+    ${AMLNN_LIBRARY}
+)

examples/blazepose_detect/cpp/src/main.cpp

@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) 2024–2025 Amlogic, Inc. 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 <iostream>
+#include <string>
+#include <vector>
+#include <chrono>
+#include <tuple>
+#include <iomanip>
+#include <fstream>
+#include <opencv2/opencv.hpp>
+#include "postprocess.h"
+#include "model_loader.h"
+
+const std::string DEFAULT_OUTPUT_PATH = "./result.jpg";
+const int MODEL_INPUT_WIDTH = 224;
+const int MODEL_INPUT_HEIGHT = 224;
+const float SCORE_THRESHOLD = 0.5f;
+const float NMS_THRESHOLD = 0.3f;
+
+int main(int argc, char **argv)
+{
+    std::string model_path;
+    std::string image_path;
+
+    if (argc != 3)
+    {
+        printf("%s <model_path> <image_path>\n", argv[0]);
+        return -1;
+    }
+
+    if (argc > 1)
+        model_path = argv[1];
+    if (argc > 2)
+        image_path = argv[2];
+
+    std::cout << "Blazepose Detect Demo" << std::endl;
+    std::cout << "Model: " << model_path << std::endl;
+    std::cout << "Image: " << image_path << std::endl;
+    std::cout << "Output: " << DEFAULT_OUTPUT_PATH << std::endl;
+
+    // 1. Load Image
+    cv::Mat img = cv::imread(image_path);
+    if (img.empty())
+    {
+        std::cerr << "Failed to load image from " << image_path << std::endl;
+        return -1;
+    }
+
+    // 2. Initialize Network
+    void *context = init_network(model_path.c_str());
+    if (!context)
+    {
+        std::cerr << "Failed to initialize network." << std::endl;
+        return -1;
+    }
+
+    // 3. Preprocess
+    auto start_time = std::chrono::high_resolution_clock::now();
+
+    auto [preprocessed, scale, pad] = preprocess(img, std::make_tuple(MODEL_INPUT_HEIGHT, MODEL_INPUT_WIDTH));
+    std::cout << "scale" << scale << std::endl;
+    std::cout << "pad: ("
+              << std::get<0>(pad) << ", "
+              << std::get<1>(pad) << ")"
+              << std::endl;
+    // Quantize to int8 (model expects quantized input)
+    cv::Mat quantized_img = quantize_input(preprocessed, 0.007843137718737125, -1);
+
+    // 4. Set input and run inference
+    nn_input inData;
+    memset(&inData, 0, sizeof(nn_input));
+    inData.input_type = BINARY_RAW_DATA;
+    inData.input = quantized_img.data;
+    inData.input_index = 0;
+    inData.size = quantized_img.total() * quantized_img.elemSize();
+
+    if (aml_module_input_set(context, &inData) != 0)
+    {
+        std::cerr << "Failed to set input." << std::endl;
+        uninit_network(context);
+        return -1;
+    }
+
+    aml_output_config_t outconfig;
+    memset(&outconfig, 0, sizeof(aml_output_config_t));
+    outconfig.typeSize = sizeof(aml_output_config_t);
+    outconfig.format = AML_OUTDATA_FLOAT32;
+
+    nn_output *outdata = (nn_output *)aml_module_output_get(context, outconfig);
+    if (!outdata)
+    {
+        std::cerr << "Failed to run network." << std::endl;
+        uninit_network(context);
+        return -1;
+    }
+
+    // 5. Postprocess
+    float *ori_boxes = (float *)outdata->out[0].buf;  // 2254 * 12
+    float *raw_scores = (float *)outdata->out[1].buf; // 2254 * 1
+
+    std::vector<BlazePoseDetection> detections = postprocess(
+        ori_boxes,
+        raw_scores,
+        std::make_tuple(preprocessed, scale, pad),
+        SCORE_THRESHOLD,
+        NMS_THRESHOLD);
+
+    auto end_time = std::chrono::high_resolution_clock::now();
+    std::chrono::duration<double, std::milli> inference_time = end_time - start_time;
+
+    std::cout << "Inference time: " << inference_time.count() << " ms" << std::endl;
+    std::cout << "Detections: " << detections.size() << std::endl;
+
+    // 6. Draw and Save
+    cv::Mat result_img = draw_detections(img, detections);
+    cv::imwrite(DEFAULT_OUTPUT_PATH, result_img);
+    std::cout << "Result saved to " << DEFAULT_OUTPUT_PATH << std::endl;
+
+    // image_path -> txt_path
+    std::string txt_path = image_path.substr(0, image_path.find_last_of('.'));
+    txt_path += ".txt";
+    std::ofstream ofs(txt_path);
+    if (ofs.is_open())
+    {
+        for (const auto &det : detections)
+        {
+            for (int i = 0; i < NUM_COORDS + 1; ++i)
+                ofs << det.coords[i] << (i < NUM_COORDS ? " " : "\n");
+        }
+    }
+    std::cout << "Detections saved to " << txt_path << std::endl;
+
+    // 7. Cleanup
+    uninit_network(context);
+
+    return 0;
+}

examples/blazepose_detect/cpp/src/postprocess.cpp

@@ -0,0 +1,306 @@
+/*
+ * Copyright (C) 2024–2025 Amlogic, Inc. 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 "postprocess.h"
+#include <iostream>
+#include <cmath>
+#include <algorithm>
+#include <unordered_map>
+
+#define LOGI(...)            \
+    do                       \
+    {                        \
+        printf(__VA_ARGS__); \
+        printf("\n");        \
+    } while (0)
+#define LOGE(...)                     \
+    do                                \
+    {                                 \
+        fprintf(stderr, __VA_ARGS__); \
+        fprintf(stderr, "\n");        \
+    } while (0)
+
+// SHOW class names (1 classes)
+const char *SHOW_CLASSES[1] = {"pose"};
+
+inline float sigmoid(float x)
+{
+    return 1.0f / (1.0f + std::exp(-x));
+}
+
+void decode_boxes(const float *ori_boxes, std::vector<std::vector<float>> &boxes)
+{
+    const float x_scale = 224.0f;
+    const float y_scale = 224.0f;
+    const float h_scale = 224.0f;
+    const float w_scale = 224.0f;
+    boxes.resize(NUM_ANCHORS, std::vector<float>(NUM_COORDS, 0.0f));
+    for (int i = 0; i < NUM_ANCHORS; ++i)
+    {
+        float x_center = ori_boxes[i * NUM_COORDS + 0] / x_scale * anchors[i * 4 + 2] + anchors[i * 4 + 0];
+        float y_center = ori_boxes[i * NUM_COORDS + 1] / y_scale * anchors[i * 4 + 3] + anchors[i * 4 + 1];
+        float w = ori_boxes[i * NUM_COORDS + 2] / w_scale * anchors[i * 4 + 2];
+        float h = ori_boxes[i * NUM_COORDS + 3] / h_scale * anchors[i * 4 + 3];
+        boxes[i][0] = y_center - h / 2.0f;
+        boxes[i][1] = x_center - w / 2.0f;
+        boxes[i][2] = y_center + h / 2.0f;
+        boxes[i][3] = x_center + w / 2.0f;
+        for (int k = 0; k < 4; ++k)
+        {
+            int offset = 4 + k * 2;
+            float keypoint_x = ori_boxes[i * NUM_COORDS + offset] / x_scale * anchors[i * 4 + 2] + anchors[i * 4 + 0];
+            float keypoint_y = ori_boxes[i * NUM_COORDS + offset + 1] / y_scale * anchors[i * 4 + 3] + anchors[i * 4 + 1];
+            boxes[i][offset] = keypoint_x;
+            boxes[i][offset + 1] = keypoint_y;
+        }
+    }
+}
+
+void convert_output_to_detections(const float *ori_boxes, const float *ori_scores, std::vector<BlazePoseDetection> &detections, float min_score_thresh = 0.3f)
+{
+    std::vector<std::vector<float>> decoded_boxes;
+    decode_boxes(ori_boxes, decoded_boxes);
+    detections.clear();
+    for (int i = 0; i < NUM_ANCHORS; ++i)
+    {
+        float s = sigmoid(std::min(std::max(ori_scores[i], -100.0f), 100.0f));
+        if (s < min_score_thresh)
+            continue;
+        BlazePoseDetection det;
+        for (int j = 0; j < NUM_COORDS; ++j)
+            det.coords[j] = decoded_boxes[i][j];
+        det.coords[NUM_COORDS] = s;
+        detections.push_back(det);
+    }
+}
+
+static inline float iou(const float *a, const float *b)
+{
+    float xA = std::max(a[1], b[1]);
+    float yA = std::max(a[0], b[0]);
+    float xB = std::min(a[3], b[3]);
+    float yB = std::min(a[2], b[2]);
+    float interW = std::max(0.0f, xB - xA);
+    float interH = std::max(0.0f, yB - yA);
+    float inter = interW * interH;
+    float areaA = (a[3] - a[1]) * (a[2] - a[0]);
+    float areaB = (b[3] - b[1]) * (b[2] - b[0]);
+    float unionAB = areaA + areaB - inter;
+    if (unionAB <= 0.0f)
+        return 0.0f;
+    return inter / unionAB;
+}
+
+void weighted_nms(
+    std::vector<BlazePoseDetection> &detections, std::vector<BlazePoseDetection> &output, float iou_threshold = 0.3f)
+{
+    output.clear();
+    if (detections.empty())
+        return;
+    std::sort(detections.begin(), detections.end(),
+              [](const BlazePoseDetection &a, const BlazePoseDetection &b)
+              {
+                  return a.coords[NUM_COORDS] > b.coords[NUM_COORDS];
+              });
+    std::vector<bool> removed(detections.size(), false);
+    for (size_t i = 0; i < detections.size(); ++i)
+    {
+        if (removed[i])
+            continue;
+        std::vector<size_t> overlap_indices;
+        overlap_indices.push_back(i);
+        for (size_t j = i + 1; j < detections.size(); ++j)
+        {
+            if (removed[j])
+                continue;
+            if (iou(detections[i].coords, detections[j].coords) > iou_threshold)
+                overlap_indices.push_back(j);
+        }
+        float total_score = 0.0f;
+        std::vector<float> weighted(NUM_COORDS, 0.0f);
+        for (size_t idx : overlap_indices)
+        {
+            float score = detections[idx].coords[NUM_COORDS];
+            total_score += score;
+            for (int k = 0; k < NUM_COORDS; ++k)
+                weighted[k] += detections[idx].coords[k] * score;
+            removed[idx] = true;
+        }
+        BlazePoseDetection wdet;
+        for (int k = 0; k < NUM_COORDS; ++k)
+            wdet.coords[k] = weighted[k] / total_score;
+        wdet.coords[NUM_COORDS] = total_score / overlap_indices.size();
+        output.push_back(wdet);
+    }
+}
+
+std::tuple<cv::Mat, float, std::tuple<int, int>> preprocess(cv::Mat img, std::tuple<int, int> new_shape)
+{
+    cv::Mat img_rgb;
+
+    if (img.empty())
+    {
+        LOGE("Preprocess received empty image");
+        return {};
+    }
+
+    // Convert to RGB
+    if (img.channels() == 4)
+        cv::cvtColor(img, img_rgb, cv::COLOR_RGBA2RGB);
+    else if (img.channels() == 3)
+        cv::cvtColor(img, img_rgb, cv::COLOR_BGR2RGB);
+    else
+        img_rgb = img.clone();
+
+    int orig_h = img.rows;
+    int orig_w = img.cols;
+    float scale = std::min(static_cast<float>(std::get<0>(new_shape)) / orig_h,
+                           static_cast<float>(std::get<1>(new_shape)) / orig_w);
+    int new_h = static_cast<int>(round(orig_h * scale));
+    int new_w = static_cast<int>(round(orig_w * scale));
+
+    cv::Mat img_resized;
+    cv::resize(img_rgb, img_resized, cv::Size(new_w, new_h), 0, 0, cv::INTER_LINEAR);
+
+    int pad_h = std::get<0>(new_shape) - new_h;
+    int pad_w = std::get<1>(new_shape) - new_w;
+    int pad_left = static_cast<int>(round(pad_w / 2.0 - 0.1));
+    int pad_right = static_cast<int>(round(pad_w / 2.0 + 0.1));
+    int pad_top = static_cast<int>(round(pad_h / 2.0 - 0.1));
+    int pad_bottom = static_cast<int>(round(pad_h / 2.0 + 0.1));
+
+    cv::Mat img_padded;
+    cv::copyMakeBorder(img_resized, img_padded, pad_top, pad_bottom, pad_left, pad_right, cv::BORDER_CONSTANT, cv::Scalar(0, 0, 0));
+
+    cv::Mat img_float;
+    img_padded.convertTo(img_float, CV_32F, 1.0 / 127.5, -1.0);
+
+    scale = 1.0f / scale;
+    int pad_orig_h = static_cast<int>(pad_top * scale);
+    int pad_orig_w = static_cast<int>(pad_left * scale);
+
+    return std::make_tuple(img_float, scale, std::make_tuple(pad_orig_h, pad_orig_w));
+}
+
+cv::Mat quantize_input(const cv::Mat &float_img, float scale, int8_t zero_point)
+{
+    if (float_img.empty() || float_img.type() != CV_32FC3)
+    {
+        LOGE("quantize_input: Invalid input image (must be CV_32FC3)");
+        return cv::Mat();
+    }
+
+    cv::Mat quantized_img(float_img.rows, float_img.cols, CV_8SC3);
+    const float *src_ptr = (const float *)float_img.data;
+    int8_t *dst_ptr = (int8_t *)quantized_img.data;
+
+    int total_elements = float_img.total() * float_img.channels();
+    for (int i = 0; i < total_elements; ++i)
+    {
+        dst_ptr[i] = static_cast<int8_t>(std::round(src_ptr[i] / scale + zero_point));
+    }
+
+    return quantized_img;
+}
+
+void denorm_detections(std::vector<float> &detection, float scale, const float pad[2])
+{
+    detection[0] = detection[0] * scale * 224.0f - pad[0];
+    detection[1] = detection[1] * scale * 224.0f - pad[1];
+    detection[2] = detection[2] * scale * 224.0f - pad[0];
+    detection[3] = detection[3] * scale * 224.0f - pad[1];
+
+    for (size_t k = 4; k + 1 < detection.size(); k += 2)
+    {
+        detection[k] = detection[k] * scale * 224.0f - pad[1];
+        detection[k + 1] = detection[k + 1] * scale * 224.0f - pad[0];
+    }
+}
+
+std::vector<BlazePoseDetection> postprocess(float *ori_boxes, float *ori_scores,
+                                            std::tuple<cv::Mat, float, std::tuple<int, int>> input_tuple,
+                                            float conf_threshold, float iou_threshold)
+{
+    float scale = std::get<1>(input_tuple);
+    int pad_left = std::get<0>(std::get<2>(input_tuple));
+    int pad_top = std::get<1>(std::get<2>(input_tuple));
+    float pad[2] = {static_cast<float>(pad_left), static_cast<float>(pad_top)};
+
+    std::vector<BlazePoseDetection> detections;
+    convert_output_to_detections(ori_boxes, ori_scores, detections, conf_threshold);
+
+    std::vector<BlazePoseDetection> filtered;
+    weighted_nms(detections, filtered, iou_threshold);
+
+    int pose_num = filtered.size();
+    for (size_t b = 0; b < pose_num; ++b)
+    {
+        std::vector<float> coords(filtered[b].coords, filtered[b].coords + NUM_COORDS + 1);
+        // mapping to original size
+        denorm_detections(coords, scale, pad);
+        for (size_t i = 0; i < NUM_COORDS + 1; ++i)
+            filtered[b].coords[i] = coords[i];
+    }
+
+    return filtered;
+}
+
+cv::Mat draw_detections(cv::Mat image, const std::vector<BlazePoseDetection> &detections)
+{
+    cv::Mat drawn_image = image.clone();
+    int class_id = 0;
+    for (const auto &det : detections)
+    {
+        // Generate color based on class_id using HSV
+        float hue = fmod(class_id * 137.508f, 360.0f);
+        cv::Mat hsv(1, 1, CV_8UC3, cv::Scalar(hue / 2.0f, 204, 230));
+        cv::Mat rgb;
+        cv::cvtColor(hsv, rgb, cv::COLOR_HSV2BGR);
+        cv::Scalar color(rgb.at<cv::Vec3b>(0, 0)[0], rgb.at<cv::Vec3b>(0, 0)[1], rgb.at<cv::Vec3b>(0, 0)[2]);
+
+        // Draw bounding box
+        int x1 = static_cast<int>(det.coords[1]);
+        int y1 = static_cast<int>(det.coords[0]);
+        int x2 = static_cast<int>(det.coords[3]);
+        int y2 = static_cast<int>(det.coords[2]);
+        cv::rectangle(drawn_image, cv::Point(x1, y1), cv::Point(x2, y2), color, 2);
+
+        // Draw label
+        std::string label = std::string(SHOW_CLASSES[class_id]) + ": " + cv::format("%.2f", det.coords[12]);
+        int baseline = 0;
+        cv::Size text_size = cv::getTextSize(label, cv::FONT_HERSHEY_SIMPLEX, 0.6, 1, &baseline);
+
+        int label_x = x1;
+        int label_y = y1 - 5;
+        if (label_y < text_size.height)
+            label_y = x1 + text_size.height + 5;
+
+        // Draw label background
+        cv::rectangle(drawn_image,
+                      cv::Point(label_x, label_y - text_size.height - baseline),
+                      cv::Point(label_x + text_size.width, label_y + baseline),
+                      color, cv::FILLED);
+
+        // Determine text color based on background brightness
+        int brightness = (color[0] + color[1] + color[2]) / 3;
+        cv::Scalar text_color = brightness < 128 ? cv::Scalar(255, 255, 255) : cv::Scalar(0, 0, 0);
+
+        cv::putText(drawn_image, label,
+                    cv::Point(label_x, label_y),
+                    cv::FONT_HERSHEY_SIMPLEX, 0.6, text_color, 1, cv::LINE_AA);
+    }
+    return drawn_image;
+}

examples/blazepose_detect/cpp/src/postprocess.h

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2024–2025 Amlogic, Inc. 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.
+ */
+
+#ifndef _AMLNN_BLAZEPOSE_DETECT_POSTPROCESS_H_
+#define _AMLNN_BLAZEPOSE_DETECT_POSTPROCESS_H_
+
+#include <opencv2/opencv.hpp>
+#include <vector>
+#include <tuple>
+#include <string>
+
+#include "anchors.h"
+
+#define NUM_COORDS 12
+
+// BlazePoseDetection result structure
+struct BlazePoseDetection
+{
+    float coords[NUM_COORDS + 1]; // 12 coords + 1 score
+};
+
+// COCO class names (80 classes)
+extern const char *COCO_CLASSES[80];
+
+// Preprocess image with letterbox resizing
+std::tuple<cv::Mat, float, std::tuple<int, int>> preprocess(cv::Mat img, std::tuple<int, int> new_shape);
+
+// Quantize float32 image to int8 for model input
+cv::Mat quantize_input(const cv::Mat &float_img, float scale = 0.007843137718737125, int8_t zero_point = -1);
+
+// Postprocess blazepose_detect outputs with DFL decoding
+std::vector<BlazePoseDetection> postprocess(float *raw_boxes, float *raw_scores,
+                                            std::tuple<cv::Mat, float, std::tuple<int, int>> input_tuple,
+                                            float conf_threshold, float iou_threshold);
+
+// Draw detections on image
+cv::Mat draw_detections(cv::Mat image, const std::vector<BlazePoseDetection> &detections);
+
+#endif // _AMLNN_BLAZEPOSE_DETECT_POSTPROCESS_H_