Use Transform We have both points on the image, the distance weight on the x-axis between the two points is 1. What is the distance weight on the vector (p1−p2) between the two points? It’s easy to calculate the result because we know Pythagorean theorem and the special direction is Read more…
I don’t know the difference between center and origin in vtkPlane when I use it in my project for the first time. I thought the center of the plane is its origin until today, it’s the reason why I could not get a correct rectangle when I tried to set Read more…
The library OpenCTM can be used to compress 3D data files. The new compressed file has only about 1/10 size compared with the original file. We can use vertex property to store the model’s color which is often PointData’s scalar in VTK. The following code snippet shows how to use Read more…
The vtkCamera object has a front clipping plane and back clipping plane. Users can only see the middle part between the clipping planes. So we can change the clipping plane's position, clipping range, to get a different 3D scene. The relevant variable in VTK is double vtkCamera: ClippingRange[2];. When we Read more…
We want to calculate a new vector that has no weight on the special axis. Calculate the projected vector on the special axis and remove it, the result is what we want. PointStruct CalculateVectorWeight(PointStruct vec0, PointStruct vec1) { vec0.Unit(); double dotValue = vec1.Dot( vec0 ); PointStruct onVec0 = vec0 * Read more…
The Basic Knowledge About Docker. To find all containers and images: [parallels@localhost ~]$ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES [parallels@localhost ~]$ docker images REPOSITORY TAG IMAGE ID CREATED SIZE mono latest 2ba93b1033ba 2 weeks ago 690MB hello-world latest fce289e99eb9 11 months ago 1.84kB To read information Read more…
The algorithm class vtkPolyDataNormals can be used to calculate normals of points and cells in polydata. The following example shows how to use it. Cube Create a cube in which every cell is a single square. All information can be found in polydata, we use vtkPolyDataNormals to handle it and Read more…
Gamma correction is a very useful method to make the original image brighter. It is a non-linear transform for every input value, the relevant math equation is in the following section. O：output value I：input value #include <stdio.h> #include <opencv2/opencv.hpp> using namespace cv; int main(int argc, char** argv ) { Mat Read more…
The linear blend operator for two images: dst = α⋅src1+β⋅src2+γ we can use the following interface to support combine two pictures. CV_EXPORTS_W void addWeighted(InputArray src1, double alpha, InputArray src2, double beta, double gamma, OutputArray dst, int dtype = -1); Notice: we need to use the images which have the same Read more…