写在最前面:这是自己的毕业,参考网上了很多大神的代码,没有你们我的毕设无法完成,谢谢你们,在此,将工程中全部代码开源出来,希望对有需要的童鞋有所帮助。
系统使用ARM处理器,运行linux系统,Qt创建工程编写主程序,可以使用OpenCV进行图像处理。
通过两个摄像头采集会图像,在LCD上进行显示,然后通过LCD上的按钮实现退出程序、保存图像、显示灰度三个功能。细节的东西就不说了,网上一抓一大把,直接上代码。。。
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>走----------------你<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
这是widget.h
-
#ifndef WIDGET_H
-
#define WIDGET_H
-
-
#include <QWidget>
-
#include <QtGui>
-
#include <QDateTime>
-
#include <cv.h>
-
#include <highgui.h>
-
#include <cxcore.h>
-
#include "camthread.h"
-
#include "globaldata.h"
-
-
namespace Ui {
-
class Widget;
-
}
-
-
class Widget : public QWidget
-
{
-
Q_OBJECT
-
-
public:
-
explicit Widget(QWidget *parent = 0);
-
~Widget();
-
-
private slots:
-
void slotShowImage(int num, unsigned char* rgb);
-
void slotGrayImage();
-
void slotSaveImage();
-
-
private:
-
Ui::Widget *ui;
-
-
volatile bool m_saveFlag_L;
-
volatile bool m_saveFlag_R;
-
volatile bool m_grayFlag_L;
-
volatile bool m_grayFlag_R;
-
-
CamThread* m_cam_L;
-
CamThread* m_cam_R;
-
};
-
-
#endif // WIDGET_H
这是widget.cpp
-
#include "widget.h"
-
#include "ui_widget.h"
-
-
Widget::Widget(QWidget *parent) :
-
QWidget(parent),
-
ui(new Ui::Widget)
-
{
-
ui->setupUi(this);
-
-
//flag set
-
m_saveFlag_L = 0;
-
m_saveFlag_R = 0;
-
m_grayFlag_L = 0;
-
m_grayFlag_R = 0;
-
//camera setup
-
m_cam_L = new CamThread("/dev/video1", LEFT_CAM);
-
if(m_cam_L->initCam() == -1)
-
printf("open %s error\n", m_cam_L->m_devName.toStdString().c_str());
-
connect(m_cam_L, SIGNAL(sigGotImage(int, unsigned char*)), this, SLOT(slotShowImage(int, unsigned char*)));
-
-
m_cam_R = new CamThread("/dev/video2", RIGHT_CAM);
-
if(m_cam_R->initCam() == -1)
-
printf("open %s error\n", m_cam_L->m_devName.toStdString().c_str());
-
connect(m_cam_R, SIGNAL(sigGotImage(int, unsigned char*)), this, SLOT(slotShowImage(int, unsigned char*)));
-
-
m_cam_L->start();
-
m_cam_R->start();
-
printf("thread start\n");
-
-
connect(ui->saveButton, SIGNAL(clicked()), this, SLOT(slotSaveImage()));
-
connect(ui->grayButton, SIGNAL(clicked()), this, SLOT(slotGrayImage()));
-
connect(ui->quitButton, SIGNAL(clicked()), qApp, SLOT(quit()));
-
}
-
-
Widget::~Widget()
-
{
-
delete ui;
-
-
free(m_cam_L);
-
free(m_cam_R);
-
}
-
-
void Widget::slotShowImage(int num, unsigned char* rgb)
-
{
-
///////////////left////////////////////////
-
if(num == LEFT_CAM)
-
{
-
cv::Mat mat_src_L(IMG_HEIGHT, IMG_WIDTH, CV_8UC3, rgb);
-
QImage qimage_L;
-
-
if(m_grayFlag_L == 1)
-
{ //gray
-
cv::Mat mat_gray_L(IMG_WIDTH, IMG_HEIGHT, CV_8UC1);
-
cv::cvtColor(mat_src_L, mat_gray_L, CV_BGR2GRAY);
-
-
qimage_L = QImage(mat_gray_L.cols, mat_gray_L.rows, QImage::Format_Indexed8); //Format_Indexed8
-
qimage_L.setColorCount(256);
-
for(int i = 0; i < 256; i++)
-
{
-
qimage_L.setColor(i, qRgb(i, i, i));
-
}
-
unsigned char* pSrc = mat_gray_L.data;
-
for(int row = 0; row < mat_gray_L.rows; row++)
-
{
-
unsigned char* pDest = qimage_L.scanLine(row);
-
memcpy(pDest, pSrc, mat_gray_L.cols);
-
pSrc += mat_gray_L.step;
-
}
-
}
-
else
-
{
-
qimage_L = QImage(mat_src_L.data, mat_src_L.cols, mat_src_L.rows, QImage::Format_RGB888);
-
}
-
ui->imgLabel_L->setPixmap(QPixmap::fromImage(qimage_L, Qt::AutoColor));
-
-
if(m_saveFlag_L == 1)
-
{ //save
-
QDateTime date_time_L = QDateTime::currentDateTime();
-
QString imgName_L = QString("/cam/%1-%2_%3:%4:%5_L.bmp")
-
.arg(date_time_L.date().month(), 2, 10, QChar('0'))
-
.arg(date_time_L.date().day(), 2, 10, QChar('0'))
-
.arg(date_time_L.time().hour(), 2, 10, QChar('0'))
-
.arg(date_time_L.time().minute(), 2, 10, QChar('0'))
-
.arg(date_time_L.time().second(), 2, 10, QChar('0'));
-
qimage_L.save(imgName_L);
-
imgName_L = imgName_L + " saved.";
-
ui->stateLabel_L->setText(imgName_L );
-
m_saveFlag_L = 0;
-
}
-
}
-
-
///////////////right////////////////////////
-
if(num == RIGHT_CAM)
-
{
-
cv::Mat mat_src_R(IMG_HEIGHT, IMG_WIDTH, CV_8UC3, rgb);
-
QImage qimage_R;
-
-
if(m_grayFlag_R == 1)
-
{ //gray
-
cv::Mat mat_gray_R(IMG_WIDTH, IMG_HEIGHT, CV_8UC1);
-
cv::cvtColor(mat_src_R, mat_gray_R, CV_BGR2GRAY);
-
-
qimage_R = QImage(mat_gray_R.cols, mat_gray_R.rows, QImage::Format_Indexed8); //Format_Indexed8
-
qimage_R.setColorCount(256);
-
for(int i = 0; i < 256; i++)
-
{
-
qimage_R.setColor(i, qRgb(i, i, i));
-
}
-
unsigned char* pSrc = mat_gray_R.data;
-
for(int row = 0; row < mat_gray_R.rows; row++)
-
{
-
unsigned char* pDest = qimage_R.scanLine(row);
-
memcpy(pDest, pSrc, mat_gray_R.cols);
-
pSrc += mat_gray_R.step;
-
}
-
}
-
else
-
{
-
qimage_R = QImage(mat_src_R.data, mat_src_R.cols, mat_src_R.rows, QImage::Format_RGB888);
-
}
-
ui->imgLabel_R->setPixmap(QPixmap::fromImage(qimage_R, Qt::AutoColor));
-
-
if(m_saveFlag_R == 1)
-
{ //save
-
QDateTime date_time_R = QDateTime::currentDateTime();
-
QString imgName_R = QString("/cam/%1-%2_%3:%4:%5_R.bmp")
-
.arg(date_time_R.date().month(), 2, 10, QChar('0'))
-
.arg(date_time_R.date().day(), 2, 10, QChar('0'))
-
.arg(date_time_R.time().hour(), 2, 10, QChar('0'))
-
.arg(date_time_R.time().minute(), 2, 10, QChar('0'))
-
.arg(date_time_R.time().second(), 2, 10, QChar('0'));
-
qimage_R.save(imgName_R);
-
imgName_R = imgName_R + " saved.";
-
ui->stateLabel_R->setText(imgName_R);
-
m_saveFlag_R = 0;
-
}
-
}
-
}
-
-
void Widget::slotSaveImage()
-
{
-
m_saveFlag_L = 1;
-
m_saveFlag_R = 1;
-
}
-
-
void Widget::slotGrayImage()
-
{
-
if(m_grayFlag_L == 0)
-
{
-
//change state
-
ui->garyLabel->setText("gray");
-
m_grayFlag_L =1;
-
m_grayFlag_R =1;
-
return;
-
}
-
-
if(m_grayFlag_L == 1)
-
{
-
//change state
-
ui->garyLabel->setText("orig");
-
m_grayFlag_L = 0;
-
m_grayFlag_R = 0;
-
return;
-
}
-
}
上面这的代码中使用了一个自定义的CamThread类,这是为了实现对两个摄像头进行多线操作而创建的类。
值得注意的是在
connect(m_cam_X, SIGNAL(sigGotImage(int, unsigned char*)), this, SLOT(slotShowImage(int, unsigned char*)));中,子线程中图像数据是如何被传入主线程中的,这里实验了很久才成功。
还有将OpenCV中的图像数据进行灰度转化时,长x宽 和 宽x长 似乎有变化,这里感谢佩佩童鞋帮我找出了这个问题。
这是camthread.h
-
/* 相机线程类
-
* 完成对相机的所用的操作,包括控制,采集
-
* 最后发送数据到主线程
-
*/
-
#ifndef CAMTHREAD_H
-
#define CAMTHREAD_H
-
-
#include <string.h>
-
#include <stdlib.h>
-
#include <errno.h>
-
#include <fcntl.h>
-
#include <unistd.h>
-
#include <sys/ioctl.h>
-
#include <sys/mman.h>
-
#include <asm/types.h>
-
#include <linux/videodev2.h>
-
#include <QString>
-
#include <QObject>
-
#include <QThread>
-
#include <QFile>
-
#include <QtGui>
-
#include <stdio.h>
-
#include "globaldata.h"
-
-
#define PIXE_FORMAT V4L2_PIX_FMT_YUYV//V4L2_PIX_FMT_MJPEG
-
#define CLEAR(x) memset(&(x), 0, sizeof(x))
-
-
class CamThread : public QThread
-
{
-
Q_OBJECT
-
-
public:
-
CamThread(QString devName, int num);
-
~CamThread();
-
-
int initCam(); //初始化设备
-
-
private:
-
int openDevice();
-
int initDevice();
-
int startCapturing();
-
//int getFrame(void** frameBuf, size_t* len);
-
int getFrame();
-
int ungetFrame();
-
int stopCapturing();
-
int uninitDevice();
-
int closeDevice();
-
-
int initMmap();
-
-
//MJPEG
-
//int is_huffman(unsigned char *buf);
-
-
//YUYV
-
int convertYUVtoRGBpixel(int y, int u, int v);
-
int convertYUVtoRGBbuffer(unsigned char* yuv, unsigned char* rgb, unsigned int w, unsigned int h);
-
-
protected:
-
void run();
-
-
signals:
-
//void sigGotImage(int num, unsigned char* &rgb);
-
void sigGotImage(int num, unsigned char* rgb);
-
-
public:
-
struct camBuffer //定义一个结构体来映射每个缓存帧
-
{
-
void* start;
-
size_t length;
-
};
-
-
QString m_devName; //设备文件名
-
int m_camNum; //用于区别左右摄像头
-
int m_fd; //文件描述符
-
camBuffer* m_buffers; //数据缓存
-
unsigned int m_nbuffers; //记录分配内存数量
-
int m_index;
-
-
unsigned char* m_yuv;
-
unsigned char* m_rgb;
-
-
};
-
-
#endif // CAMTHREAD_H
这是camthread.cpp
-
#include "camthread.h"
-
-
CamThread::CamThread(QString devName, int num)
-
{
-
m_devName = devName; //设备文件名
-
m_camNum = num; //用于区别左右摄像头
-
m_fd = -1; //文件描述符
-
m_buffers = NULL; //数据缓存
-
m_nbuffers = 0; //记录分配内存数量
-
-
m_yuv = NULL;
-
m_rgb = NULL;
-
//m_qimage = NULL;
-
}
-
-
CamThread::~CamThread()
-
{
-
-
}
-
-
-
//////////////////////////图像获取///////////////////////////////////////////////////
-
int CamThread::initCam()
-
{
-
if(openDevice() == -1)
-
{
-
printf("open %s error\n", m_devName.toStdString().c_str());
-
closeDevice();
-
return -1;
-
}
-
if(initDevice() == -1)
-
{
-
printf("init %s error\n", m_devName.toStdString().c_str());
-
closeDevice();
-
return -1;
-
}
-
if(startCapturing() == -1)
-
{
-
printf("startCapturing %s error\n", m_devName.toStdString().c_str());
-
closeDevice();
-
return -1;
-
}
-
-
return 0;
-
}
-
-
void CamThread::run()
-
{
-
while(1)
-
{
-
getFrame();
-
//printf("getFrame()\n");
-
convertYUVtoRGBbuffer(m_yuv, m_rgb, IMG_WIDTH, IMG_HEIGHT);
-
//printf("YUV2RGB\n");
-
emit sigGotImage(m_camNum, m_rgb);
-
//printf("emit signal\n");
-
ungetFrame();
-
msleep(30);
-
}
-
}
-
-
////////////////////////摄像头具体操作/////////////////////////////////////////////////////
-
int CamThread::openDevice()
-
{
-
m_fd = open(m_devName.toStdString().c_str(), O_RDWR, 0);
-
if(m_fd == -1)
-
{
-
printf("open: %s\n", strerror(errno));
-
return -1;
-
}
-
-
return 0;
-
}
-
-
int CamThread::initDevice()
-
{
-
//查询设备属性
-
v4l2_capability cap;
-
if(ioctl(m_fd, VIDIOC_QUERYCAP, &cap) == -1)
-
{
-
if(EINVAL == errno)
-
printf("%s is no v4l2 device\n", (char*)&m_devName);
-
else
-
printf("VIDIOC_QUERYCAP: %s\n", strerror(errno));
-
return -1;
-
}
-
if(!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
-
{
-
printf("%s is not video capture device\n", (char*)&m_devName);
-
return -1;
-
}
-
if(!(cap.capabilities & V4L2_CAP_STREAMING))
-
{
-
printf("%s dose not support streaming\n", (char*)&m_devName);
-
return -1;
-
}
-
if(!(cap.capabilities & V4L2_CAP_READWRITE))
-
{
-
printf("%s dose not support read.write\n", m_devName.toStdString().c_str());
-
//return -1;
-
}
-
-
//图像的缩放
-
v4l2_cropcap cropcap;
-
v4l2_crop crop;
-
CLEAR(cropcap);
-
cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
if(ioctl(m_fd, VIDIOC_CROPCAP, &cropcap) == 0)
-
{
-
CLEAR(crop);
-
crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
crop.c = cropcap.defrect;
-
if(ioctl(m_fd, VIDIOC_S_CROP, &crop) == -1)
-
{
-
if(EINVAL == errno)
-
{
-
printf("VIDIOC_S_CROP not supported\n");
-
}
-
else
-
{
-
printf("VIDIOC_S_CROP: %s\n", strerror(errno));
-
return -1;
-
}
-
}
-
}
-
else
-
{
-
printf("VIDIOC_CROPCAP: %s\n", strerror(errno));
-
return -1;
-
}
-
-
//查询所有支持格式
-
v4l2_fmtdesc fmtdesc;
-
CLEAR(fmtdesc);
-
fmtdesc.index = 0;
-
fmtdesc.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
printf("support format:\n");
-
while(ioctl(m_fd, VIDIOC_ENUM_FMT, &fmtdesc) != -1)
-
{
-
printf("\t%d.%s\n", fmtdesc.index+1, fmtdesc.description);
-
fmtdesc.index++;
-
}
-
-
//设置格式
-
v4l2_format fmt;
-
CLEAR(fmt);
-
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
fmt.fmt.pix.width = IMG_WIDTH;
-
fmt.fmt.pix.height = IMG_HEIGHT;
-
fmt.fmt.pix.pixelformat = PIXE_FORMAT;
-
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
-
if(ioctl(m_fd, VIDIOC_S_FMT, &fmt) == -1)
-
{
-
printf("VIDIOC_S_FMT: %s\n", strerror(errno));
-
return -1;
-
}
-
-
//mmap
-
if(initMmap() == -1)
-
{
-
printf("init mmap error \n");
-
return -1;
-
}
-
-
//m_rgb m_qimage
-
m_yuv = (unsigned char*)malloc(IMG_WIDTH*IMG_HEIGHT*3*sizeof(char));
-
m_rgb = (unsigned char*)malloc(IMG_WIDTH*IMG_HEIGHT*3*sizeof(char));
-
-
return 0;
-
}
-
-
int CamThread::startCapturing()
-
{
-
//把四个缓冲帧放入队列,并启动数据流
-
for(unsigned int i = 0; i < m_nbuffers; ++i)
-
{
-
v4l2_buffer buf;
-
CLEAR(buf);
-
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
buf.memory = V4L2_MEMORY_MMAP;
-
buf.index = i;
-
if(ioctl(m_fd, VIDIOC_QBUF, &buf) == -1) //缓冲帧放入队列
-
{
-
printf("VIDIOC_QBUF %s\n",strerror(errno));
-
return -1;
-
}
-
}
-
-
v4l2_buf_type type;
-
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
if(ioctl(m_fd, VIDIOC_STREAMON, &type) == -1)
-
{
-
printf("VIDIOC_STREAMON %s\n", strerror(errno));
-
return -1;
-
}
-
-
return 0;
-
}
-
-
//int CamThread::getFrame(void** frameBuf, size_t* len)
-
int CamThread::getFrame()
-
{
-
//从缓冲区取出一帧,并保存
-
v4l2_buffer queue_buf;
-
CLEAR(queue_buf);
-
queue_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
queue_buf.memory = V4L2_MEMORY_MMAP;
-
if(ioctl(m_fd, VIDIOC_DQBUF, &queue_buf) == -1)
-
{
-
switch(errno)
-
{
-
case EAGAIN:
-
return -1;
-
case EIO:
-
return -1;
-
default:
-
printf("VIDIOC_DQUBUF: %s\n", strerror(errno));
-
return -1;
-
}
-
}
-
//printf("DQBUF done\n");
-
//*frameBuf = m_buffers[queue_buf.index].start;
-
//*len = m_buffers[queue_buf.index].length; //queue_buf.bytesused;
-
m_index = queue_buf.index; //buffer的序号
-
-
//YUYV
-
memcpy(m_yuv, m_buffers[queue_buf.index].start, m_buffers[queue_buf.index].length);
-
//printf("memcpy done\n");
-
-
/*
-
//MJPEG
-
memcpy(m_tmpBuffer, m_buffers[queue_buf.index].start, queue_buf.bytesused );
-
-
m_fileFd = fopen("cam.jpg", "wb");
-
unsigned char *ptdeb, *ptcur = m_tmpBuffer;
-
int sizein;
-
if(!is_huffman(m_tmpBuffer))
-
{
-
ptdeb = ptcur = m_tmpBuffer;
-
while (((ptcur[0] << 8) | ptcur[1]) != 0xffc0)
-
ptcur++;
-
sizein = ptcur - ptdeb;
-
fwrite(m_tmpBuffer, sizein, 1, m_fileFd);
-
fwrite(dht_data, DHT_SIZE, 1, m_fileFd);
-
fwrite(ptcur, queue_buf.bytesused-sizein, 1, m_fileFd);
-
}
-
else
-
{
-
fwrite(ptcur, queue_buf.bytesused, 1, m_fileFd);
-
}
-
fclose(m_fileFd);
-
*/
-
-
return 0;
-
}
-
-
int CamThread::ungetFrame()
-
{
-
if(m_index != -1)
-
{
-
//将取出的帧放回缓冲区(队列)
-
v4l2_buffer queue_buf;
-
CLEAR(queue_buf);
-
queue_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
queue_buf.memory = V4L2_MEMORY_MMAP;
-
queue_buf.index = m_index;
-
if(ioctl(m_fd, VIDIOC_QBUF, &queue_buf) == -1)
-
{
-
printf("VIDIOC_QBUF: %s\n", strerror(errno));
-
return -1;
-
}
-
-
return 0;
-
}
-
printf("m_index = -1\n");
-
return -1;
-
}
-
-
int CamThread::stopCapturing()
-
{
-
v4l2_buf_type type;
-
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
if(ioctl(m_fd, VIDIOC_STREAMOFF, &type) == -1)
-
{
-
printf("VIDIOC_STREAMOFF %s\n", strerror(errno));
-
return -1;
-
}
-
-
return 0;
-
}
-
-
int CamThread::uninitDevice()
-
{
-
for(unsigned int i = 0; i < m_nbuffers; ++i)
-
{
-
if(munmap(m_buffers[i].start, m_buffers[i].length))
-
{
-
printf("munmap %s\n", strerror(errno));
-
return -1;
-
}
-
}
-
free(m_buffers);
-
free(m_yuv);
-
free(m_rgb);
-
-
return 0;
-
}
-
-
int CamThread::closeDevice()
-
{
-
if(close(m_fd) == -1)
-
{
-
printf("close: %s", strerror(errno));
-
return -1;
-
}
-
-
return 0;
-
}
-
-
int CamThread::initMmap()
-
{
-
//申请缓冲区 ?申请设备中的缓存帧
-
v4l2_requestbuffers reqbuf;
-
CLEAR(reqbuf);
-
reqbuf.count = 4; //缓冲区内缓冲帧数目
-
reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; //缓存帧数据格式
-
reqbuf.memory = V4L2_MEMORY_MMAP; //I/O方式,内存映射的方式
-
if(ioctl(m_fd, VIDIOC_REQBUFS, &reqbuf) == -1)
-
{
-
if(EINVAL == errno)
-
printf("%s does not support memory mapping\n", (char*)&m_devName);
-
else
-
printf("VIDIOC_REQUBUF %s\n", strerror(errno));
-
return -1;
-
}
-
if(reqbuf.count < 2)
-
{
-
printf("insufficient buffer memory on %s\n", (char*)&m_devName);
-
return -1;
-
}
-
-
//映射缓存区帧
-
m_buffers = (camBuffer*)calloc(reqbuf.count, sizeof(*m_buffers));
-
if(!m_buffers)
-
{
-
printf("out of memory\n");
-
return -1;
-
}
-
for(m_nbuffers = 0; m_nbuffers < reqbuf.count; ++m_nbuffers)
-
{
-
v4l2_buffer buf; //缓存帧
-
CLEAR(buf);
-
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-
buf.memory = V4L2_MEMORY_MMAP;
-
buf.index = m_nbuffers; //buffer的序号
-
// 查询序号为n_buffers 的缓冲区,得到其起始物理地址和大小
-
if(ioctl(m_fd, VIDIOC_QUERYBUF, &buf) == -1) //获取(查询)这些缓存帧的地址、长度
-
{
-
printf("VIDIOC_QUERYBUF: %s\n", strerror(errno));
-
return -1;
-
}
-
m_buffers[m_nbuffers].length = buf.length; //设置
-
//将申请到的缓存帧映射到应用程序,用m_buffers指针记录
-
m_buffers[m_nbuffers].start = mmap(NULL,
-
buf.length,
-
PROT_READ | PROT_WRITE,
-
MAP_SHARED,
-
m_fd,
-
buf.m.offset);
-
if(m_buffers[m_nbuffers].start == MAP_FAILED)
-
{
-
printf("mmap %s\n", strerror(errno));
-
return -1;
-
}
-
}
-
-
return 0;
-
}
-
-
//////////////////////MJPEG/////////////////////////////////
-
/*
-
int CamThread::is_huffman(unsigned char *buf)
-
{
-
unsigned char *ptbuf;
-
int i = 0;
-
ptbuf = buf;
-
while (((ptbuf[0] << 8) | ptbuf[1]) != 0xffda)
-
{
-
if(i++ > 2048)
-
return 0;
-
if(((ptbuf[0] << 8) | ptbuf[1]) == 0xffc4)
-
return 1;
-
ptbuf++;
-
}
-
return 0;
-
}
-
*/
-
-
//////////////////////YUYV图像转换////////////////////////////////////////
-
int CamThread::convertYUVtoRGBpixel(int y, int u, int v)
-
{
-
unsigned int pixel_32 = 0;
-
unsigned char *pixel = (unsigned char *)&pixel_32;
-
int r, g, b;
-
r = y + (1.370705 * (v-128));
-
g = y - (0.698001 * (v-128)) - (0.337633 * (u-128));
-
b = y + (1.732446 * (u-128));
-
if(r > 255)
-
r = 255;
-
if(g > 255)
-
g = 255;
-
if(b > 255)
-
b = 255;
-
if(r < 0)
-
r = 0;
-
if(g < 0)
-
g = 0;
-
if(b < 0)
-
b = 0;
-
pixel[0] = r*220/256;
-
pixel[1] = g*220/256;
-
pixel[2] = b*220/256;
-
-
return pixel_32;
-
}
-
-
int CamThread::convertYUVtoRGBbuffer(unsigned char* yuv, unsigned char* rgb, unsigned int w, unsigned int h)
-
{
-
unsigned int in, out = 0;
-
unsigned int pixel_16;
-
unsigned char pixel_24[3];
-
unsigned int pixel_32;
-
int y0, u, y1, v;
-
-
for(in = 0; in < w*h*2; in+=4)
-
{
-
pixel_16 = yuv[in+3]<<24 |
-
yuv[in+2]<<16 |
-
yuv[in+1]<<8 |
-
yuv[in+0];
-
y0 = (pixel_16 & 0x000000ff);
-
u = (pixel_16 & 0x0000ff00) >> 8;
-
y1 = (pixel_16 & 0x00ff0000) >> 16;
-
v = (pixel_16 & 0xff000000) >> 24;
-
-
pixel_32 = convertYUVtoRGBpixel(y0, u, v);
-
pixel_24[0] = (pixel_32 & 0x000000ff);
-
pixel_24[1] = (pixel_32 & 0x0000ff00) >> 8;
-
pixel_24[2] = (pixel_32 & 0x00ff0000) >> 16;
-
rgb[out++] = pixel_24[0];
-
rgb[out++] = pixel_24[1];
-
rgb[out++] = pixel_24[2];
-
-
pixel_32 = convertYUVtoRGBpixel(y1, u, v);
-
pixel_24[0] = (pixel_32 & 0x000000ff);
-
pixel_24[1] = (pixel_32 & 0x0000ff00) >> 8;
-
pixel_24[2] = (pixel_32 & 0x00ff0000) >> 16;
-
rgb[out++] = pixel_24[0];
-
rgb[out++] = pixel_24[1];
-
rgb[out++] = pixel_24[2];
-
}
-
-
return 0;
-
}
CamThread类是通过V4L2来实现对摄像头的操作,从摄像头中获取到YUV格式的数据后,还要将其转换为RGB格式的,这里看了关于YUV与RGB颜色空间之间关系的论文,他俩之间是可以相互转换的,最后参考了网上一位大神的代码,时间久远查找不便,不能给出出处请见谅。发现论文中的参数和大神代码中的参数是有些微不同的,但大神的代码运行良好而且参数差值很小,因此没有修改。
至于main.cpp就不用在赘述了。。。
附上运行图
个人水平有限难免有错误之处,希望不吝敕教
未能详尽解说,之后会再进行补充
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