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/******************************************************************
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Copyright © Deng Zhimao Co., Ltd. 1990-2021. All rights reserved.
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* @projectName 05_opencv_camera
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* @brief camera.cpp
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* @author Deng Zhimao
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* @email 1252699831@qq.com
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* @net www.openedv.com
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* @date 2021-03-17
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*******************************************************************/
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#include "camera.h"
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/* opencv4 */
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#if __arm__
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#include "opencv4/opencv2/core/core.hpp"
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#include "opencv4/opencv2/highgui/highgui.hpp"
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/* CV_CAP_PROP_FRAME_WIDTH这样的宏在此头文件里 */
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#include "opencv4/opencv2/videoio/legacy/constants_c.h"
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#else
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/* Ubuntu18上使用的opencv3，头文件路径 */
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#include "opencv2/core/core.hpp"
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#include "opencv2/highgui/highgui.hpp"
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#endif
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#include <QImage>
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#include <QDebug>
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Camera::Camera(QObject *parent) :
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QObject(parent)
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{
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/* 实例化 */
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capture = new cv::VideoCapture();
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timer = new QTimer(this);
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/* 信号槽连接 */
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connect(timer, SIGNAL(timeout()), this, SLOT(timerTimeOut()));
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}
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Camera::~Camera()
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{
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delete capture;
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capture = NULL;
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}
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void Camera::selectCameraDevice(int index)
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{
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/* 如果有其他摄像头打开了，先释放 */
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if (capture->isOpened()) {
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capture->release();
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}
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/* 打开摄像头设备 */
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capture->open(index);
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/* 设置采集摄像头的分辨率的宽度 */
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capture ->set(CV_CAP_PROP_FRAME_WIDTH, 640);
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/* 设置采集摄像头的分辨率的高度 */
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capture ->set(CV_CAP_PROP_FRAME_HEIGHT, 480);
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/* 设置亮度 */
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capture ->set(CV_CAP_PROP_BRIGHTNESS, 1);
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/* 设置曝光 */
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capture ->set(CV_CAP_PROP_EXPOSURE, -7);
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/* 设置对比度 */
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capture ->set(CV_CAP_PROP_CONTRAST, 60);
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}
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bool Camera::cameraProcess(bool bl)
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{
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if (bl) {
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/* 为什么是33？1000/33约等于30帧，也就是一秒最多显示30帧 */
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timer->start(33);
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} else {
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timer->stop();
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}
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/* 返回摄像头的状态 */
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return capture->isOpened();
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}
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void Camera::timerTimeOut()
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{
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/* 如果摄像头没有打开，停止定时器，返回 */
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if (!capture->isOpened()) {
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timer->stop();
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return;
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}
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static cv::Mat frame;
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*capture >> frame;
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if (frame.cols)
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/* 发送图片信号 */
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emit readyImage(matToQImage(frame));
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}
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QImage Camera::matToQImage(const cv::Mat &img)
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{
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/* USB摄像头和OV5640等都是RGB三通道，不考虑单/四通道摄像头 */
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if(img.type() == CV_8UC3) {
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/* 得到图像的的首地址 */
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const uchar *pimg = (const uchar*)img.data;
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/* 以img构造图片 */
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QImage qImage(pimg, img.cols, img.rows, img.step,
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QImage::Format_RGB888);
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/* 在不改变实际图像数据的条件下，交换红蓝通道 */
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return qImage.rgbSwapped();
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}
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/* 返回QImage */
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return QImage();
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}
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