vtk颜色映射_牛客博客

1、提取颜色组分

这里要说一下，由于255是白色 0是黑色，所以提取单色后对应的颜色就没了==

比方说，我的例图中“写代码”三个字是红色的，所以提取红通道的对应位置啥都没有了，因为超级亮啊~~

还有，分区域的时候x,y坐标千万别写反了==做题的时候犯这种低级错误，做项目居然还犯

通过这份代码，我还发现了，cmake做的事只是把编译的乱七八糟的vtk相关的东西连接上进去，如果想修改代码一些小细节，直接在/bin目录下的*.sln中打开之前的.cpp修改即可，根本不需要修改一点就重新编译==

计划自己至少还要多久学完vtk的时候翻到了”9.1.3环境变量的加载“发现把.dll文件复制到c:/windows/system就好啦~~以后再也不用把dll逐个复制到debug里面啦~~

#include <vtkImageData.h>
#include <vtkSmartPointer.h>
#include <vtkImageExtractComponents.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkBMPReader.h>
#include <vtkImageActor.h>


int main(int argc, char* argv[])
{

	vtkSmartPointer<vtkBMPReader> reader =
		vtkSmartPointer<vtkBMPReader>::New();
	reader->SetFileName("../lena.bmp");

	vtkSmartPointer<vtkImageExtractComponents> extractRedFilter =
		vtkSmartPointer<vtkImageExtractComponents>::New();
	extractRedFilter->SetInputConnection(reader->GetOutputPort());
	extractRedFilter->SetComponents(0);
	extractRedFilter->Update();

	vtkSmartPointer<vtkImageExtractComponents> extractGreenFilter =
		vtkSmartPointer<vtkImageExtractComponents>::New();
	extractGreenFilter->SetInputConnection(reader->GetOutputPort());
	extractGreenFilter->SetComponents(1);
	extractGreenFilter->Update();

	vtkSmartPointer<vtkImageExtractComponents> extractBlueFilter =
		vtkSmartPointer<vtkImageExtractComponents>::New();
	extractBlueFilter->SetInputConnection(reader->GetOutputPort());
	extractBlueFilter->SetComponents(2);
	extractBlueFilter->Update();

	// Create actors
	vtkSmartPointer<vtkImageActor> inputActor =
		vtkSmartPointer<vtkImageActor>::New();
	inputActor->SetInputData(reader->GetOutput());

	vtkSmartPointer<vtkImageActor> redActor =
		vtkSmartPointer<vtkImageActor>::New();
	redActor->SetInputData(extractRedFilter->GetOutput());

	vtkSmartPointer<vtkImageActor> greenActor =
		vtkSmartPointer<vtkImageActor>::New();
	greenActor->SetInputData(extractGreenFilter->GetOutput());

	vtkSmartPointer<vtkImageActor> blueActor =
		vtkSmartPointer<vtkImageActor>::New();
	blueActor->SetInputData(extractBlueFilter->GetOutput());

	double inputViewport[4] = { 0.0, 0.0, 0.5, 0.5 };
	double redViewport[4] = { 0.5, 0.0,1.0,0.5 };
	double greenViewport[4] = { 0.0, 0.5, 0.5, 1.0 };
	double blueViewport[4] = { 0.5, 0.5, 1.0, 1.0 };;

	vtkSmartPointer<vtkRenderer> inputRenderer =
		vtkSmartPointer<vtkRenderer>::New();
	inputRenderer->SetViewport(inputViewport);
	inputRenderer->AddActor(inputActor);
	inputRenderer->ResetCamera();
	inputRenderer->SetBackground(1.0, 1.0, 1.0);

	vtkSmartPointer<vtkRenderer> redRenderer =
		vtkSmartPointer<vtkRenderer>::New();
	redRenderer->SetViewport(redViewport);
	redRenderer->AddActor(redActor);
	redRenderer->ResetCamera();
	redRenderer->SetBackground(1.0, 1.0, 1.0);

	vtkSmartPointer<vtkRenderer> greenRenderer =
		vtkSmartPointer<vtkRenderer>::New();
	greenRenderer->SetViewport(greenViewport);
	greenRenderer->AddActor(greenActor);
	greenRenderer->ResetCamera();
	greenRenderer->SetBackground(1.0, 1.0, 1.0);

	vtkSmartPointer<vtkRenderer> blueRenderer =
		vtkSmartPointer<vtkRenderer>::New();
	blueRenderer->SetViewport(blueViewport);
	blueRenderer->AddActor(blueActor);
	blueRenderer->ResetCamera();
	blueRenderer->SetBackground(1.0, 1.0, 1.0);

	vtkSmartPointer<vtkRenderWindow> renderWindow =
		vtkSmartPointer<vtkRenderWindow>::New();
	renderWindow->AddRenderer(inputRenderer);
	renderWindow->AddRenderer(redRenderer);
	renderWindow->AddRenderer(greenRenderer);
	renderWindow->AddRenderer(blueRenderer);

	renderWindow->SetSize(800, 600);
	renderWindow->Render();
	renderWindow->SetWindowName("ImageExtractComponentsExample");

	vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
		vtkSmartPointer<vtkRenderWindowInteractor>::New();
	vtkSmartPointer<vtkInteractorStyleImage> style =
		vtkSmartPointer<vtkInteractorStyleImage>::New();

	renderWindowInteractor->SetInteractorStyle(style);
	renderWindowInteractor->SetRenderWindow(renderWindow);
	renderWindowInteractor->Initialize();
	renderWindowInteractor->Start();

	return EXIT_SUCCESS;
}

2、既然有把颜色提取分离，一定会有把颜色合并的算法~~

下面的就是是的，我又把区域范围调整了==

#include <vtkSmartPointer.h>
#include <vtkImageData.h>
#include <vtkImageAppendComponents.h>
#include <vtkImageCanvasSource2D.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkInteractorStyleImage.h>
#include <vtkRenderer.h>
#include <vtkJPEGReader.h>
#include <vtkImageActor.h>

int main(int, char *[])
{
	vtkSmartPointer<vtkImageCanvasSource2D> red =
		vtkSmartPointer<vtkImageCanvasSource2D>::New();
	red->SetScalarTypeToUnsignedChar();
	red->SetNumberOfScalarComponents(1);
	red->SetExtent(0, 100, 0, 100, 0, 0);
	red->SetDrawColor(0, 0, 0, 0);
	red->FillBox(0, 100, 0, 100);
	red->SetDrawColor(255, 0, 0, 0);//灰度图像只加入了一个通道颜色==
	red->FillBox(20, 40, 20, 40);//这两步骤相当于是先设置画笔颜色，再用这个画笔涂色~~
	red->Update();

	vtkSmartPointer<vtkImageCanvasSource2D> green =
		vtkSmartPointer<vtkImageCanvasSource2D>::New();
	green->SetScalarTypeToUnsignedChar();
	green->SetNumberOfScalarComponents(1);
	green->SetExtent(0, 100, 0, 100, 0, 0);
	green->SetDrawColor(0, 0, 0, 0);
	green->FillBox(0, 100, 0, 100);
	green->SetDrawColor(255, 0, 0, 0);
	green->FillBox(30, 50, 30, 50);
	green->Update();

	vtkSmartPointer<vtkImageCanvasSource2D> blue =
		vtkSmartPointer<vtkImageCanvasSource2D>::New();
	blue->SetScalarTypeToUnsignedChar();
	blue->SetNumberOfScalarComponents(1);
	blue->SetExtent(0, 100, 0, 100, 0, 0);
	blue->SetDrawColor(0, 0, 0, 0);
	blue->FillBox(0, 100, 0, 100);
	blue->SetDrawColor(255, 0, 0, 0);
	blue->FillBox(40, 60, 40, 60);
	blue->Update();

	vtkSmartPointer<vtkImageAppendComponents> appendFilter =
		vtkSmartPointer<vtkImageAppendComponents>::New();
	//先将R通道颜色设置进去，然后是G 最后是B 
	//第一行的用SetInputConnection  Add~都可以的
	appendFilter->AddInputConnection(0, red->GetOutputPort());
	appendFilter->AddInputConnection(0, green->GetOutputPort());
	appendFilter->AddInputConnection(0, blue->GetOutputPort());
	appendFilter->Update();


	//下面都是千篇一律的了~~
	vtkSmartPointer<vtkImageActor> redActor =
		vtkSmartPointer<vtkImageActor>::New();
	redActor->SetInputData(red->GetOutput());

	vtkSmartPointer<vtkImageActor> greenActor =
		vtkSmartPointer<vtkImageActor>::New();
	greenActor->SetInputData(green->GetOutput());

	vtkSmartPointer<vtkImageActor> blueActor =
		vtkSmartPointer<vtkImageActor>::New();
	blueActor->SetInputData(blue->GetOutput());

	vtkSmartPointer<vtkImageActor> combinedActor =
		vtkSmartPointer<vtkImageActor>::New();
	combinedActor->SetInputData(appendFilter->GetOutput());

	// Define viewport ranges
	// (xmin, ymin, xmax, ymax)
	double redViewport[4] = { 0.0, 0.0, 0.5, 0.5 };
	double greenViewport[4] = { 0.5, 0.0, 1.0, 0.5 };
	double blueViewport[4] = { 0.0, 0.5, 0.5, 1.0 };
	double combinedViewport[4] = { 0.5, 0.5, 1.0, 1.0 };

	// Setup renderers
	vtkSmartPointer<vtkRenderer> redRenderer =
		vtkSmartPointer<vtkRenderer>::New();
	redRenderer->SetViewport(redViewport);
	redRenderer->AddActor(redActor);
	redRenderer->ResetCamera();
	redRenderer->SetBackground(1.0, 1.0, 1.0);

	vtkSmartPointer<vtkRenderer> greenRenderer =
		vtkSmartPointer<vtkRenderer>::New();
	greenRenderer->SetViewport(greenViewport);
	greenRenderer->AddActor(greenActor);
	greenRenderer->ResetCamera();
	greenRenderer->SetBackground(1.0, 1.0, 1.0);

	vtkSmartPointer<vtkRenderer> blueRenderer =
		vtkSmartPointer<vtkRenderer>::New();
	blueRenderer->SetViewport(blueViewport);
	blueRenderer->AddActor(blueActor);
	blueRenderer->ResetCamera();
	blueRenderer->SetBackground(1.0, 1.0, 1.0);

	vtkSmartPointer<vtkRenderer> combinedRenderer =
		vtkSmartPointer<vtkRenderer>::New();
	combinedRenderer->SetViewport(combinedViewport);
	combinedRenderer->AddActor(combinedActor);
	combinedRenderer->ResetCamera();
	combinedRenderer->SetBackground(1.0, 1.0, 1.0);

	vtkSmartPointer<vtkRenderWindow> renderWindow =
		vtkSmartPointer<vtkRenderWindow>::New();
	renderWindow->AddRenderer(redRenderer);
	renderWindow->AddRenderer(greenRenderer);
	renderWindow->AddRenderer(blueRenderer);
	renderWindow->AddRenderer(combinedRenderer);
	renderWindow->SetSize(600, 600);
	renderWindow->Render();
	renderWindow->SetWindowName("ImageAppendComponentsExample");

	vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
		vtkSmartPointer<vtkRenderWindowInteractor>::New();
	vtkSmartPointer<vtkInteractorStyleImage> style =
		vtkSmartPointer<vtkInteractorStyleImage>::New();

	renderWindowInteractor->SetInteractorStyle(style);
	renderWindowInteractor->SetRenderWindow(renderWindow);
	renderWindowInteractor->Initialize();
	renderWindowInteractor->Start();

	return EXIT_SUCCESS;
}