摘要
本篇博文記錄一下,用VS+Qt+Halcon實(shí)現(xiàn)對(duì)圖片的讀取以及鼠標(biāo)縮放,移動(dòng)(鼠標(biāo)事件調(diào)用了halcon自帶的算子)的過(guò)程。以及遇到的坑.....
先來(lái)看一下動(dòng)態(tài)效果圖:
主要控件:
- 添加一個(gè)Label控件,對(duì)象名設(shè)為label,用于顯示圖片,并將背景設(shè)為黑色,設(shè)置方法為:選中Label控件,在屬性編輯器中找到styleSheet屬性,在其后的值中輸入background-color:black即可;
- 添加四個(gè)Push Button控件,如上圖所示從左至右,對(duì)象名依次為:btn_prePic、btn_openPic、btn_nextPic,btn_resetPic,用于打開(kāi)圖片和前后瀏覽,以及恢復(fù)原圖;
- 添加一個(gè)Label,對(duì)象名設(shè)為label_status,用于實(shí)時(shí)顯示坐標(biāo)和灰度值;
- 將label_show控件提升為CMyLabel類,用于接收鼠標(biāo)事件。
代碼例程
在Visual Studio中新建一個(gè)Qt GUI項(xiàng)目,名稱設(shè)為BrowsePic,并新建Mylabel類(繼承自QLabel)用于label控件的提升。
Mylabel.h
#pragma once #include "qlabel.h" #include"QWheelEvent" #include<HalconCpp.h> using namespace HalconCpp; class Mylabel : public QLabel { Q_OBJECT public: Mylabel(QWidget* parent = Q_NULLPTR); ~Mylabel(); //設(shè)置Halcon圖像和Halcon窗口句柄,用戶響應(yīng)鼠標(biāo)事件后實(shí)時(shí)更新圖像 void setHalconWnd(HObject img, HTuple hHalconID, QLabel* label); //鼠標(biāo)滾輪縮放事件 void wheelEvent(QWheelEvent* ev); //鼠標(biāo)按下事件 void mousePressEvent(QMouseEvent* ev); //鼠標(biāo)釋放事件 void mouseReleaseEvent(QMouseEvent* ev); //鼠標(biāo)移動(dòng)事件 void mouseMoveEvent(QMouseEvent* ev); public: HTuple m_labelID; //Qt標(biāo)簽句柄 HTuple m_hHalconID; //Halcon窗口句柄 HObject m_currentImg; //當(dāng)前的圖像 //主界面顯示坐標(biāo)的標(biāo)簽 QLabel* m_label; //鼠標(biāo)按下的位置 HTuple m_tMouseDownRow; HTuple m_tMouseDownCol; bool m_bIsMove; //是否移動(dòng)圖像標(biāo)識(shí) };
Mylabel.cpp
#include "Mylabel.h" //定義單步放大倍率 #define ZOOMRATIO 2.0 Mylabel::Mylabel(QWidget* parent) : QLabel(parent) { m_bIsMove = false; this->setMouseTracking(true); } Mylabel::~Mylabel() { } //設(shè)置Halcon圖像和Halcon窗口句柄,用戶響應(yīng)鼠標(biāo)事件后實(shí)時(shí)更新圖像 void Mylabel::setHalconWnd(HObject img, HTuple hHalconID, QLabel* label) { m_hHalconID = hHalconID; m_currentImg = img; m_label = label; } //鼠標(biāo)滾輪縮放事件,用于縮放圖像 void Mylabel::wheelEvent(QWheelEvent* ev) { double Zoom; //放大或縮小倍率 HTuple mouseRow, mouseCol, Button; HTuple startRowBf, startColBf, endRowBf, endColBf, Ht, Wt, startRowAft, startColAft, endRowAft, endColAft; //滾輪前滑,放大 if (ev->delta()>0) { Zoom = ZOOMRATIO; } else//否則縮小 { Zoom = 1 / ZOOMRATIO; } //獲取光標(biāo)在原圖上的位置,注意是原圖坐標(biāo),不是Label下的坐標(biāo) HTuple hv_Exception, hv_ErrMsg; try { GetMposition(m_hHalconID, &mouseRow, &mouseCol, &Button); } catch (HException& HDevExpDefaultException) { return; } //獲取原圖顯示的部分,注意也是原圖坐標(biāo) GetPart(m_hHalconID, &startRowBf, &startColBf, &endRowBf, &endColBf); //縮放前顯示的圖像寬高 Ht = endRowBf - startRowBf; Wt = endColBf - startColBf; //普通版halcon能處理的圖像最大尺寸是32K*32K。如果無(wú)限縮小原圖像,導(dǎo)致顯示的圖像超出限制,則會(huì)造成程序崩潰 if (Ht*Wt<20000*20000||Zoom==ZOOMRATIO) { //計(jì)算縮放后的圖像區(qū)域 startRowAft = mouseRow - ((mouseRow - startRowBf) / Zoom); startColAft = mouseCol - ((mouseCol - startColBf) / Zoom); endRowAft = startRowAft + (Ht / Zoom); endColAft = startColAft + (Wt / Zoom); //如果放大過(guò)大,則返回 if (endRowAft - startRowAft < 2) { return; } if (m_hHalconID != NULL) { //如果有圖像,則先清空?qǐng)D像 DetachBackgroundFromWindow(m_hHalconID); } SetPart(m_hHalconID, startRowAft, startColAft, endRowAft, endColAft); AttachBackgroundToWindow(m_currentImg, m_hHalconID); } } void Mylabel::mousePressEvent(QMouseEvent* ev) { HTuple mouseRow, mouseCol, Button; try { GetMposition(m_hHalconID, &mouseRow, &mouseCol, &Button); } catch (HException) { return; } //鼠標(biāo)按下時(shí)的行列坐標(biāo) m_tMouseDownRow = mouseRow; m_tMouseDownCol = mouseCol; m_bIsMove = true; } //鼠標(biāo)釋放事件 void Mylabel::mouseReleaseEvent(QMouseEvent* ev) { m_bIsMove = false; } //鼠標(biāo)移動(dòng)事件 void Mylabel::mouseMoveEvent(QMouseEvent* ev) { HTuple startRowBf, startColBf, endRowBf, endColBf, mouseRow, mouseCol, Button; try { GetMposition(m_hHalconID, &mouseRow, &mouseCol, &Button); } catch (HException) { return; } //鼠標(biāo)按下并移動(dòng)時(shí),移動(dòng)圖像,否則只顯示坐標(biāo) if (m_bIsMove) { //計(jì)算移動(dòng)值 double RowMove = mouseRow[0].D() - m_tMouseDownRow[0].D(); double ColMove = mouseCol[0].D() - m_tMouseDownCol[0].D(); //得到當(dāng)前的窗口坐標(biāo) GetPart(m_hHalconID, &startRowBf, &startColBf, &endRowBf, &endColBf); //移動(dòng)圖像 if (m_hHalconID!=NULL) { //如果有圖像,則先清空?qǐng)D像 DetachBackgroundFromWindow(m_hHalconID); } SetPart(m_hHalconID, startRowBf - RowMove, startColBf - ColMove, endRowBf - RowMove, endColBf - ColMove); AttachBackgroundToWindow(m_currentImg, m_hHalconID); } //獲取灰度值 HTuple pointGray; try { GetGrayval(m_currentImg, mouseRow, mouseCol, &pointGray); } catch (HException) { m_label->setText(QString::fromLocal8Bit("X坐標(biāo):- Y坐標(biāo):- 灰度值:-")); return; } //設(shè)置坐標(biāo) m_label->setText(QString::fromLocal8Bit("X坐標(biāo):%1 Y坐標(biāo):%2 灰度值:%3").arg(mouseCol[0].D()).arg(mouseRow[0].D()).arg(pointGray[0].D())); }
BrowsePic.h
#pragma once #include <QtWidgets/QWidget> #include "ui_BrowsePic.h" #include<HalconCpp.h> #include"qtoolbar.h" using namespace HalconCpp; #pragma execution_character_set("utf-8"); class BrowsePic : public QWidget { Q_OBJECT public: BrowsePic(QWidget *parent = Q_NULLPTR); ~BrowsePic(); //初始化 void init(); //顯示圖像 void showImg(); int currentIndex; //顯示圖像的控件id HTuple m_hLabelID; //QLabel控件句柄 HTuple m_hHalconID; //Halcon顯示窗口句柄 //原始圖像的尺寸 HTuple m_imgWidth, m_imgHeight; //圖片路徑列表 HTuple m_imgFiles; //當(dāng)前圖像 HObject m_hCurrentImg; //縮放后的圖像 HObject m_hResizedImg; //縮放系數(shù) HTuple m_hvScaledRate; //縮放后圖像的大小 HTuple m_scaledHeight, m_scaledWidth; QToolBar* m_toolBar; public slots: //打開(kāi)圖片 void on_btn_openPic_clicked(); //瀏覽前一張 void on_btn_prePic_clicked(); //瀏覽后一張 void on_btn_nextPic_clicked(); //恢復(fù)圖片 void on_btn_resetPic_clicked(); private: Ui::BrowsePicClass ui; };
BrowsePic.cpp
#include "browsepic.h" #include"Mylabel.h" #include <QFileDialog> #include <QFileInfo> BrowsePic::BrowsePic(QWidget *parent) : QWidget(parent) { ui.setupUi(this); init(); } BrowsePic::~BrowsePic() { } void BrowsePic::init() { //設(shè)置halcon的文件路徑為utf8,解決中文亂碼 SetSystem("filename_encoding", "utf8"); //生成空?qǐng)D像 GenEmptyObj(&m_hCurrentImg); m_hHalconID = NULL; m_hLabelID = (Hlong)ui.label->winId(); currentIndex = -1; } //顯示圖像 void BrowsePic::showImg() { if (m_hHalconID!=NULL) { //如果有圖像,則先清空?qǐng)D像 DetachBackgroundFromWindow(m_hHalconID); } else { //打開(kāi)窗口 OpenWindow(0, 0, ui.label->width(), ui.label->height(), m_hLabelID, "visible", "", &m_hHalconID); } ui.label-> setHalconWnd(m_hCurrentImg, m_hHalconID, ui.label_status); //獲取圖像大小 GetImageSize(m_hCurrentImg, &m_imgWidth, &m_imgHeight); //獲取縮放系數(shù) TupleMin2(1.0 * ui.label->width() / m_imgWidth, 1.0 * ui.label->height() / m_imgHeight, &m_hvScaledRate); //縮放圖像 ZoomImageFactor(m_hCurrentImg, &m_hResizedImg, m_hvScaledRate, m_hvScaledRate, "constant"); //獲取縮放后的大小 GetImageSize(m_hResizedImg, &m_scaledWidth, &m_scaledHeight); //打開(kāi)窗口 if (1.0 * ui.label->width() / m_imgWidth < 1.0 * ui.label->height() / m_imgHeight) { SetWindowExtents(m_hHalconID, ui.label->height() / 2.0 - m_scaledHeight / 2.0, 0, ui.label->width(), m_scaledHeight); } else { SetWindowExtents(m_hHalconID, 0, ui.label->width() / 2.0 - m_scaledWidth / 2.0, m_scaledWidth, ui.label->height()); } SetPart(m_hHalconID, 0, 0, m_imgHeight - 1, m_imgWidth - 1); AttachBackgroundToWindow(m_hCurrentImg, m_hHalconID); } //打開(kāi)圖片 void BrowsePic::on_btn_openPic_clicked() { QString path = QFileDialog::getOpenFileName(this, "加載圖像", "./", "圖像文件(*.bmp *.png *.jpg)"); QFileInfo fileInfo(path); QString dir = fileInfo.path(); if (!path.isEmpty()) { ListFiles(dir.toStdString().c_str(), "files", &m_imgFiles); TupleRegexpSelect(m_imgFiles, HTuple("\\.bmp|png|jpg").Append("ignore_case"), &m_imgFiles); for (int i = 0; i < m_imgFiles.Length(); i++) { QString currentPath = m_imgFiles[i]; currentPath.replace("\\", "/"); if (currentPath == path) { currentIndex = i; ReadImage(&m_hCurrentImg, m_imgFiles[i]); showImg(); } } } } //瀏覽前一張 void BrowsePic::on_btn_prePic_clicked() { if (currentIndex > 0) { currentIndex--; ReadImage(&m_hCurrentImg, m_imgFiles[currentIndex]); showImg(); } } //瀏覽后一張 void BrowsePic::on_btn_nextPic_clicked() { if (currentIndex >= 0 && currentIndex < m_imgFiles.Length() - 1) { currentIndex++; ReadImage(&m_hCurrentImg, m_imgFiles[currentIndex]); showImg(); } } //恢復(fù)圖片 void BrowsePic::on_btn_resetPic_clicked() { showImg(); }
關(guān)鍵代碼解釋
Qt函數(shù)與Halcon算子獲取的文件路徑字符串的區(qū)別
Halcon算子獲取的文件路徑格式
list_files()的原型如下:
第一個(gè)參數(shù)為路徑,提取的文件路徑格式與參數(shù)Directory的形式有關(guān),在HDevelop中測(cè)試:
CDirectory以"\\"分隔時(shí),即list_files ('E:\\TEST', 'files', Files)
CDirectory以“/”分隔時(shí),即list_files ('E:/TEST', 'files', Files)
可以發(fā)現(xiàn)兩種方式提取的文件路徑字符串的區(qū)別。
Qt函數(shù)獲取的文件路徑格式
getOpenFileName()獲得的路徑:
如何將二者路徑保持一致?
先讀取halcon算子獲取的路徑:
QString currentPath = m_imgFiles[i];
然后將" \ "全部換成" /":
currentPath.replace("\\", "/");
2??在VS中使用Halcon時(shí)的編碼及中文亂碼問(wèn)題
默認(rèn)條件下,可使用以下C++語(yǔ)句獲取Halcon的文件名編碼:
HTuple codeType; get_system("filename_encoding", &codeType); QString strCodeType = codeType[0].S();
可以發(fā)現(xiàn)默認(rèn)的編碼是locale,此時(shí)用Halcon算子list_files獲取的文件路徑中如果包含中文,則會(huì)出現(xiàn)亂碼
解決方法:將Halcon的文件名編碼格式設(shè)置為utf8,代碼如下:
set_system("filename_encoding", "utf8");
參考鏈接:
VS+Qt應(yīng)用開(kāi)發(fā)-使用Halcon算子實(shí)現(xiàn)從文件夾打開(kāi)圖片、前后瀏覽、縮放居中顯示_羽士的博客-CSDN博客
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原文鏈接:https://www.cnblogs.com/xyf327/p/15186230.html