Qt如何实现视频监控画面

这篇文章将为大家详细讲解有关Qt如何实现视频监控画面，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。

一、前言

视频监控系统在整个安防领域，已经做到了烂大街的程序，全国起码几百家公司做过类似的系统，当然这一方面的需求量也是非常旺盛的，各种定制化的需求越来越多，尤其是这几年借着人脸识别的东风，发展更加迅猛，人脸识别相关的技术和应用这几年处于风口浪尖，衍生了特别多的应用产品，各种人脸识别的产品遍地开花，刷脸门禁，车站机场人脸识别，刷脸取票等，但是其实大部分内行人士可能都比较绝望，外行感觉像看科幻片一样，老板们各种打鸡血，今天几个亿明天几个亿。

纵观Qt的应用场景领域，在国内，基本上在安防、航天船舶、教育、工业控制领域，占有比较大的比例，其实个人非常喜爱Qt的，从没见过如此完美的API封装，包括命名，最牛逼的就是跨平台特性，可以说完爆.NET的跨平台，甚至连那种几十兆的嵌入式linux版本都能运行，这就使得成本大大降低，提高了产品的丰富性。自从用了Qt以后，就再也不想用VC/VB/C#等。

视频监控画面在任何视频监控系统中是少不了的一个功能，基本上是需要1画面、4画面、6画面、8画面、9画面、16画面等，Qt提供的表格布局非常胜任这个工作，网上几乎没有看到qt做的最基础的视频监控画面分割的demo，今天特意花几分钟提取出来，开源放出来。欢迎大家多多点赞！现在还增加了25画面、36画面，里边的函数封装的很好，稍微加几行可以直接增加49画面等其他的。

二、代码思路

void VideoPanel::change_video(int index, int flag){    int count = 0;    int row = 0;    int column = 0;    for (int i = 0; i < videoCount; i++) {        if (i >= index) {            gridLayout->addWidget(widgets.at(i), row, column);            widgets.at(i)->setVisible(true);            count++;            column++;            if (column == flag) {                row++;                column = 0;            }        }        if (count == (flag * flag)) {            break;        }    }}void VideoPanel::change_video_4(int index){    hide_video_all();    change_video(index, 2);}void VideoPanel::change_video_6(int index){    hide_video_all();    if (index == 0) {        gridLayout->addWidget(widgets.at(0), 0, 0, 2, 2);        gridLayout->addWidget(widgets.at(1), 0, 2, 1, 1);        gridLayout->addWidget(widgets.at(2), 1, 2, 1, 1);        gridLayout->addWidget(widgets.at(3), 2, 2, 1, 1);        gridLayout->addWidget(widgets.at(4), 2, 1, 1, 1);        gridLayout->addWidget(widgets.at(5), 2, 0, 1, 1);        for (int i = 0; i < 6; i++) {            widgets.at(i)->setVisible(true);        }    } else if (index == 5) {        gridLayout->addWidget(widgets.at(5), 0, 0, 2, 2);        gridLayout->addWidget(widgets.at(6), 0, 2, 1, 1);        gridLayout->addWidget(widgets.at(7), 1, 2, 1, 1);        gridLayout->addWidget(widgets.at(8), 2, 2, 1, 1);        gridLayout->addWidget(widgets.at(9), 2, 1, 1, 1);        gridLayout->addWidget(widgets.at(10), 2, 0, 1, 1);        for (int i = 5; i < 11; i++) {            widgets.at(i)->setVisible(true);        }    } else if (index == 10) {        gridLayout->addWidget(widgets.at(10), 0, 0, 2, 2);        gridLayout->addWidget(widgets.at(11), 0, 2, 1, 1);        gridLayout->addWidget(widgets.at(12), 1, 2, 1, 1);        gridLayout->addWidget(widgets.at(13), 2, 2, 1, 1);        gridLayout->addWidget(widgets.at(14), 2, 1, 1, 1);        gridLayout->addWidget(widgets.at(15), 2, 0, 1, 1);        for (int i = 10; i < 16; i++) {            widgets.at(i)->setVisible(true);        }    }}void VideoPanel::change_video_8(int index){    hide_video_all();    if (index == 0) {        gridLayout->addWidget(widgets.at(0), 0, 0, 3, 3);        gridLayout->addWidget(widgets.at(1), 0, 3, 1, 1);        gridLayout->addWidget(widgets.at(2), 1, 3, 1, 1);        gridLayout->addWidget(widgets.at(3), 2, 3, 1, 1);        gridLayout->addWidget(widgets.at(4), 3, 3, 1, 1);        gridLayout->addWidget(widgets.at(5), 3, 2, 1, 1);        gridLayout->addWidget(widgets.at(6), 3, 1, 1, 1);        gridLayout->addWidget(widgets.at(7), 3, 0, 1, 1);        for (int i = 0; i < 8; i++) {            widgets.at(i)->setVisible(true);        }    } else if (index == 8) {        gridLayout->addWidget(widgets.at(8), 0, 0, 3, 3);        gridLayout->addWidget(widgets.at(9), 0, 3, 1, 1);        gridLayout->addWidget(widgets.at(10), 1, 3, 1, 1);        gridLayout->addWidget(widgets.at(11), 2, 3, 1, 1);        gridLayout->addWidget(widgets.at(12), 3, 3, 1, 1);        gridLayout->addWidget(widgets.at(13), 3, 2, 1, 1);        gridLayout->addWidget(widgets.at(14), 3, 1, 1, 1);        gridLayout->addWidget(widgets.at(15), 3, 0, 1, 1);        for (int i = 8; i < 16; i++) {            widgets.at(i)->setVisible(true);        }    }}void VideoPanel::change_video_9(int index){    hide_video_all();    change_video(index, 3);}void VideoPanel::change_video_13(int index){    hide_video_all();    if (index == 0) {        gridLayout->addWidget(widgets.at(0), 0, 0, 1, 1);        gridLayout->addWidget(widgets.at(1), 0, 1, 1, 1);        gridLayout->addWidget(widgets.at(2), 0, 2, 1, 1);        gridLayout->addWidget(widgets.at(3), 0, 3, 1, 1);        gridLayout->addWidget(widgets.at(4), 1, 0, 1, 1);        gridLayout->addWidget(widgets.at(5), 2, 0, 1, 1);        gridLayout->addWidget(widgets.at(6), 1, 1, 2, 2);        gridLayout->addWidget(widgets.at(7), 1, 3, 1, 1);        gridLayout->addWidget(widgets.at(8), 2, 3, 1, 1);        gridLayout->addWidget(widgets.at(9), 3, 0, 1, 1);        gridLayout->addWidget(widgets.at(10), 3, 1, 1, 1);        gridLayout->addWidget(widgets.at(11), 3, 2, 1, 1);        gridLayout->addWidget(widgets.at(12), 3, 3, 1, 1);        for (int i = 0; i < 13; i++) {            widgets.at(i)->setVisible(true);        }    } else if (index == 3) {        gridLayout->addWidget(widgets.at(3), 0, 0, 1, 1);        gridLayout->addWidget(widgets.at(4), 0, 1, 1, 1);        gridLayout->addWidget(widgets.at(5), 0, 2, 1, 1);        gridLayout->addWidget(widgets.at(6), 0, 3, 1, 1);        gridLayout->addWidget(widgets.at(7), 1, 0, 1, 1);        gridLayout->addWidget(widgets.at(8), 2, 0, 1, 1);        gridLayout->addWidget(widgets.at(9), 1, 1, 2, 2);        gridLayout->addWidget(widgets.at(10), 1, 3, 1, 1);        gridLayout->addWidget(widgets.at(11), 2, 3, 1, 1);        gridLayout->addWidget(widgets.at(12), 3, 0, 1, 1);        gridLayout->addWidget(widgets.at(13), 3, 1, 1, 1);        gridLayout->addWidget(widgets.at(14), 3, 2, 1, 1);        gridLayout->addWidget(widgets.at(15), 3, 3, 1, 1);        for (int i = 3; i < 16; i++) {            widgets.at(i)->setVisible(true);        }    }}void VideoPanel::change_video_16(int index){    hide_video_all();    change_video(index, 4);}void VideoPanel::change_video_25(int index){    hide_video_all();    change_video(index, 5);}void VideoPanel::change_video_36(int index){    hide_video_all();    change_video(index, 6);}void VideoPanel::change_video_64(int index){    hide_video_all();    change_video(index, 8);}

三、效果图

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