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本文主要演示如何使用LockAI视觉识别模块进行视频流的读取,同时使用Edit模块进行图像传输。
例程源代码地址:https://gitee.com/LockzhinerAI/LockzhinerVisionModule/tree/master/Cpp_example/A01_capture
OpenCV(Open Source Computer Vision Library)是一个开源的计算机视觉库,提供丰富的图像处理和视频捕获功能。通过其VideoCapture
类,开发者可以轻松调用摄像头设备并获取视频流。
cv::VideoCapture
是OpenCV中用于管理视频输入的核心类,支持从摄像头、视频文件或网络流读取帧。常用功能包括:
#include <opencv2/opencv.hpp>
cv::VideoCapture cap;
open()
前不占用硬件资源cap.set(cv::CAP_PROP_FRAME_WIDTH, width);
cap.set(cv::CAP_PROP_FRAME_HEIGHT, height);
cv::CAP_PROP_FRAME_WIDTH
: 帧宽度(像素)cv::CAP_PROP_FRAME_HEIGHT
: 帧高度(像素)分辨率对照表:根据摄像头的分辨率和帧率,选择合适的分辨率和帧率。以下为常见分辨率与帧率对照表
摄像头分辨率(4:3) | FPS |
---|---|
480x360 | 25 |
640x480 | 25 |
960x720 | 14 |
1280x960 | 13 |
1920x1440 | 13 |
摄像头分辨率(16:9) | FPS |
---|---|
480x270 | 25 |
640x360 | 25 |
960x540 | 25 |
1280x720 | 15 |
1920x1080 | 12 |
cap.open(0);
true
,否则返回false
cap >> frame;
false
#include <lockzhiner_vision_module/edit/edit.h>
Edit edit;
edit.StartAndAcceptConnection();
true
,否则返回false
edit.Print(frame);
cv::Mat
对象,表示图像帧cv::VideoCapture cap;
const int width = 640;
const int height = 480;
cap.set(cv::CAP_PROP_FRAME_WIDTH, width);
cap.set(cv::CAP_PROP_FRAME_HEIGHT, height);
while (true) {
cv::Mat frame;
cap >> frame;
if (frame.empty()) {
std::cerr << "Warning: Couldn't read a frame from the camera."
<< std::endl;
continue;
}
}
#include <iostream>
#include <opencv2/opencv.hpp>
int main() {
cv::VideoCapture cap;
cap.set(cv::CAP_PROP_FRAME_WIDTH, 640);
cap.set(cv::CAP_PROP_FRAME_HEIGHT, 480);
cap.open(0); // 参数0表示默认摄像头设备
if (!cap.isOpened()) {
std::cerr << "Error: Could not open camera." << std::endl;
return EXIT_FAILURE;
}
while (true) {
cv::Mat frame;
cap >> frame;
if (frame.empty()) {
std::cerr << "Warning: Couldn't read a frame from the camera."
<< std::endl;
continue;
}
}
cap.release();
return 0;
}
cv::VideoCapture cap;
const int width = 640;
const int height = 480;
cap.set(cv::CAP_PROP_FRAME_WIDTH, width);
cap.set(cv::CAP_PROP_FRAME_HEIGHT, height);
lockzhiner_vision_module::edit::Edit edit;
if (!edit.StartAndAcceptConnection()) {
std::cerr << "Error: Failed to start and accept connection." << std::endl;
return EXIT_FAILURE;
}
while (true) {
cv::Mat frame;
cap >> frame;
if (frame.empty()) {
std::cerr << "Warning: Couldn't read a frame from the camera."
<< std::endl;
continue;
}
edit.Print(frame);
}
#include <lockzhiner_vision_module/edit/edit.h>
#include <iostream>
#include <opencv2/opencv.hpp>
int main()
{
// 初始化 edit 模块
lockzhiner_vision_module::edit::Edit edit;
if (!edit.StartAndAcceptConnection())
{
std::cerr << "Error: Failed to start and accept connection." << std::endl;
return EXIT_FAILURE;
}
std::cout << "Device connected successfully." << std::endl;
// 初始化摄像头
cv::VideoCapture cap;
int width = 640; // 设置摄像头分辨率宽度
int height = 480; // 设置摄像头分辨率高度
cap.set(cv::CAP_PROP_FRAME_WIDTH, width);
cap.set(cv::CAP_PROP_FRAME_HEIGHT, height);
// 打开摄像头设备
cap.open(0); // 参数 0 表示默认摄像头设备
if (!cap.isOpened())
{
std::cerr << "Error: Could not open camera." << std::endl;
return EXIT_FAILURE;
}
// 主循环:读取摄像头帧并传递给 edit 模块
while (true)
{
cv::Mat frame; // 存储每一帧图像
cap >> frame; // 获取新的一帧
// 检查是否成功读取帧
if (frame.empty())
{
std::cerr << "Warning: Couldn't read a frame from the camera."
<< std::endl;
continue;
}
// 使用 edit 模块处理帧
edit.Print(frame);
}
// 释放摄像头资源
cap.release();
return 0;
}
# CMake最低版本要求
cmake_minimum_required(VERSION 3.10)
project(test_capture)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
# 定义项目根目录路径
set(PROJECT_ROOT_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../..")
message("PROJECT_ROOT_PATH = " ${PROJECT_ROOT_PATH})
include("${PROJECT_ROOT_PATH}/toolchains/arm-rockchip830-linux-uclibcgnueabihf.toolchain.cmake")
# 定义 OpenCV SDK 路径
set(OpenCV_ROOT_PATH "${PROJECT_ROOT_PATH}/third_party/opencv-mobile-4.10.0-lockzhiner-vision-module")
set(OpenCV_DIR "${OpenCV_ROOT_PATH}/lib/cmake/opencv4")
find_package(OpenCV REQUIRED)
set(OPENCV_LIBRARIES "${OpenCV_LIBS}")
# 定义 LockzhinerVisionModule SDK 路径
set(LockzhinerVisionModule_ROOT_PATH "${PROJECT_ROOT_PATH}/third_party/lockzhiner_vision_module_sdk")
set(LockzhinerVisionModule_DIR "${LockzhinerVisionModule_ROOT_PATH}/lib/cmake/lockzhiner_vision_module")
find_package(LockzhinerVisionModule REQUIRED)
# 配置摄像头数据
add_executable(Test-Capture test_capture.cc)
target_include_directories(Test-Capture PRIVATE ${LOCKZHINER_VISION_MODULE_INCLUDE_DIRS})
target_link_libraries(Test-Capture PRIVATE ${OPENCV_LIBRARIES} ${LOCKZHINER_VISION_MODULE_LIBRARIES})
install(
TARGETS Test-Capture
RUNTIME DESTINATION .
)
使用 Docker Destop 打开 LockzhinerVisionModule 容器并执行以下命令来编译项目
# 进入Demo所在目录
cd /LockzhinerVisionModuleWorkSpace/LockzhinerVisionModule/Cpp_example/A01_capture
# 创建编译目录
rm -rf build && mkdir build && cd build
# 配置交叉编译工具链
export TOOLCHAIN_ROOT_PATH="/LockzhinerVisionModuleWorkSpace/arm-rockchip830-linux-uclibcgnueabihf"
# 使用cmake配置项目
cmake ..
# 执行编译项目
make -j8 && make install
在执行完上述命令后,会在build目录下生成可执行文件。
在凌智视觉模块中输入以下命令:
chmod 777 Test_Capture
./Test_Capture
本文档介绍了如何使用 LockAI 和 OpenCV 实现摄像头模块的视频流读取与图像传输。核心步骤包括:
注意事项:
640x480
分辨率以平衡性能和画质;