Qt 实现 图片 二值化 灰度化代码

#include "mark_system.h" QString image_path = "UI/image/"; Mark_System::Mark_System(QWidget *parent) : QMainWindow(parent) { QTextCodec::setCodecForLocale(QTextCodec::codecForName("GBK")); ui.setupUi(this); connect(ui.btn_Origin,SIGNAL(clicked()),this,SLOT(slot_Origin())); connect(ui.btn_GrayScale,SIGNAL(clicked()),this,SLOT(slot_GrayScale())); connect(ui.btn_Binaryzation,SIGNAL(clicked()),this,SLOT(slot_Binaryzation())); connect(ui.btn_Save,SIGNAL(clicked()),this,SLOT(slot_Save())); root_widget = NULL; image = NULL; image_widget_label =NULL; root_widget = new QWidget(this); //这里用电脑屏幕做测试，所以写死0,0,实际上用rootwidget.location.x和rootwidget.location.y root_widget->move(0,0); root_widget->resize(500,375); root_widget->setAutoFillBackground(true); QPalette palette; palette.setColor(QPalette::Background, QColor(0,0,0,0)); root_widget->setPalette(palette); image_widget_label = new QLabel(root_widget); image_widget_label->move(0, 0); //image_widget_label->setPixmap(QPixmap(image_path + "love.png")); image = new QImage(500,375,QImage::Format_Indexed8); QString filename = QFileDialog::getOpenFileName(this,tr("选择图片"),"",tr("Images (*.bmp *.png *.jpg)")); image->load(filename); image_widget_label->setPixmap(QPixmap::fromImage(*image)); } Mark_System::~Mark_System() { } void Mark_System::slot_Origin() { image_widget_label->setPixmap(QPixmap::fromImage(*image)); } void Mark_System::slot_GrayScale() { int height = image->height(); int width = image->width(); QImage ret(width, height, QImage::Format_Indexed8); ret.setColorCount(256); for(int i = 0; i < 256; i++) { ret.setColor(i, qRgb(i, i, i)); } switch(image->format()) { case QImage::Format_Indexed8: /*for(int i = 0; i < height; i ++) { const uchar *pSrc = (uchar *)image->constScanLine(i); uchar *pDest = (uchar *)ret.scanLine(i); memcpy(pDest, pSrc, width); } */ break; case QImage::Format_RGB32: case QImage::Format_ARGB32: case QImage::Format_ARGB32_Premultiplied: for(int i = 0; i < height; i ++) { const QRgb *pSrc = (QRgb *)image->constScanLine(i); uchar *pDest = (uchar *)ret.scanLine(i); for( int j = 0; j < width; j ++) { pDest[j] = qGray(pSrc[j]); } } break; } image_widget_label->setPixmap(QPixmap::fromImage(ret)); } void Mark_System::slot_Binaryzation() { int height = image->height(); int width = image->width(); QImage ret(width, height, QImage::Format_Indexed8); ret.setColorCount(256); for(int i = 0; i < 256; i++) { ret.setColor(i, qRgb(i, i, i)); } switch(image->format()) { case QImage::Format_Indexed8: /*for(int i = 0; i < height; i ++) { const uchar *pSrc = (uchar *)image->constScanLine(i); uchar *pDest = (uchar *)ret.scanLine(i); memcpy(pDest, pSrc, width); } */ break; case QImage::Format_RGB32: case QImage::Format_ARGB32: case QImage::Format_ARGB32_Premultiplied: unsigned long tmp = 0; for(int i = 0; i < height; i ++) { const QRgb *pSrc = (QRgb *)image->constScanLine(i); uchar *pDest = (uchar *)ret.scanLine(i); for( int j = 0; j < width; j ++) { pDest[j] = qGray(pSrc[j]); tmp +=pDest[j]; } } if(ui.binaryzation_Value->text().toInt() > 0) tmp = ui.binaryzation_Value->text().toInt(); else tmp = tmp/(height*width); qDebug()<<tmp; for(int i = 0; i < height; i ++) { const QRgb *pSrc = (QRgb *)image->constScanLine(i); uchar *pDest = (uchar *)ret.scanLine(i); for( int j = 0; j < width; j ++) { if(qGray(pSrc[j])>tmp) pDest[j] = 255; else pDest[j] = 0; } } break; } image_widget_label->setPixmap(QPixmap::fromImage(ret)); } void Mark_System::slot_Save() { QString filename1 = QFileDialog::getSaveFileName(this,tr("Save Image"),"",tr("Images (*.png *.bmp *.jpg)")); //选择路径 QScreen *screen = QGuiApplication::primaryScreen(); screen->grabWindow(image_widget_label->winId()).save(filename1); }