StephenWei – Page 63

Run The First ITK Example On Mac

Environment: cmake 3.16.0-rc4 InsightToolkit-5.0.1 macOS Catalina 10.15 Build And Install ITK Download tar.gz file, extract it, create a building directory and go into it. Then build the ITK project and install it. cmake ../ -G “Unix Makefiles” \ -DModule_ItkVtkGlue:BOOL=ON make sudo make install — Installing: /usr/local/include/ITK-5.0/itkWatershedSegmentTree.h — Installing: /usr/local/include/ITK-5.0/itkMorphologicalWatershedImageFilter.h — Read more…

By StephenWei, 5 years2019-11-23 ago

CPlusPlus

OpenCV Changes Image Color By Lookup Table

We can use a lookup table to change the original image, the lookup table is like a simple map tool which returns a result if we give input data. #include <iostream> #include <stdio.h> #include <opencv2/opencv.hpp> using namespace cv; using namespace std; int main(int argc, char* argv[]) { if (argc < Read more…

By StephenWei, 5 years2019-11-19 ago

OpenCV

OpenCV Mat

The copy operation for mat: cv::Mat::clone() or cv::Mat::copyTo(). Most of the copying interfaces are under the reference count mechanism. All image information is expressed by a single matrix in OpenCV. The tuple (r, g, b) is used by men to watch the colorful world. #include <iostream> #include <stdio.h> #include <opencv2/opencv.hpp> Read more…

By StephenWei, 5 years2019-11-19 ago

OpenCV

Install And Run OpenCV On Mac

Learn from website：https://sites.google.com/site/yonasstephenfyp2013/updates/tutorialinstallingopencvonmacosxmountainlionDownload opencv-4.0.1 compressed file and extract it, then go into it and build project. mkdir opencv_build cd opencv_build cmake -G “Unix Makefiles” ../ Generate Makefile successfully： — Found JNI: /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/JavaVM.framework — Found VTK 8.1.1 (/usr/local/lib/cmake/vtk-8.1/UseVTK.cmake) — Looking for dlerror in dl — Looking for dlerror in dl – Read more…

By StephenWei, 5 years2019-11-19 ago

VTK

Can’t Show Progress Bar Above QVTKOpenGLWidget On Windows

After upgrade vtk from 7.1.0 to 8.2.0, the old project shows a warning window about VTKWidget. The newest vtk-qt program suggest me not to use old QVTKWidget anymore, so I rewrite my qt UI file I have qt UI file as the following code snippet, a few widgets are put Read more…

By StephenWei, 5 years2019-11-08 ago

VTK

Create A Big Plane By Center And Normal

Draw The Plane Manually We can create a big plane if we know its origin and normal. The algorithm class vtkPlaneSource is a solution for it, but the generated plane is too small, it’s hard to create a big plane based on vtkPlaneSource, so I wrote a function for the Read more…

By StephenWei, 5 years2019-11-08 ago

VTK

Review Every Cell In VTK 3D Model

They are many different cells in VTK, they can be divided into two kinds, linear cells, and non-linear cells. The following images are from VTKUsersGuide. Linear Cells Non-Linear Cells Although vtkUnstructuredGrid and vtkPolyData are similar, there are substantial differences. vtkPolyData can only represent cells of topological dimension 2 or less Read more…

By StephenWei, 5 years2019-10-28 ago

VTK

Create And Show ImageData In VTK

Here is relevant introduction about vtkImageData from VTKUsersGuide. A vtkImageData dataset is defined by data dimensions, interpoint spacing, and the origin (i.e., lower-left corner) of the dataset. If the dimension of the dataset is two, then we call the vtkImageData dataset an image, and it is composed of vtkPixel cell Read more…

By StephenWei, 5 years2019-10-28 ago

Mac

Using LLDB To Explore Why My Program Crashed

Last night I read some pages in VTKUsersGuide to learn VTK factory mechanism. I got the basic steps of defining my own factory and use it. Implement virtual function which is declared in vtkObjectFactory. virtual const char* GetVTKSourceVersion(); virtual const char* GetDescription(); Create Object Use the protected function RegisterOverride which Read more…

By StephenWei, 5 years2019-10-19 ago