int imgwidth=img->width();
int imgheight=img->height();
unsigned char* graydata =img->bits();
vector<int> hist(256);
//初始为0;
for(int i=0;i<256;i++;)
{
hist[i]=0;
}
for(int i=0;i<imgheight;i++)
{
for(int j=0;i<imgwidth;j++)
{
QColor color=img->pixelcolor(j,i);
int redcolor=color.red();
int greencolor=color.green();
int bluecolor=color.blue();
int index=(redColor+greenColor+blueColor);
hist[index]=hist[index]++;
graydata+=3;
}
}
//画图
QtCharts::QLineSeries *series=new QtCharts::QLineSeries();
for(int i=0;i<256;i++;)
{
series->append(i,hist[i]);
}
QtCharts::QChartView *chartView=new QtCharts::QChartView(ui.graphicsView_4);
chartView->chart()->addSeries(series);
series->setName("直方图");
QtCharts::QValueAxis *axisx=new QtCharts::QValueAxis();
axisx->setTitleText("像元个数");
chartView->chart()->setAxisX(axisx,series);
QtCharts::QValueAxis *axisy=new QtCharts::QValueAxis();
axisy->setTitleText("灰度值");
chartView->chart()->setAxisY(axisY,series);
charView->resize(ui.graphicsView_4->width(),ui.graphicsView_4->heigtht());
charView->show();