ChessBoard | Java library for working with a chess game | Game Engine library

I tried a camera calibration with python and opencv to find the camera matrix. I used the following code from this link

https://automaticaddison.com/how-to-perform-camera-calibration-using-opencv/

I wanted to implement a chessboard with gridlayout & framelayout. When I hardcoded the xml everything works fine. But when I tried to implement it programmatically all things fall apart. In xml I added

I'm making chess in c++, by making an array of pointers to class Piece.

I try to create Structured-light 3D scanner.

Camera calibration is copy of OpenCV official tutorial. As resutlt I have camera intrinsic parameters(camera matrix).

Projector calibration maybe is not correct but process was: Projector show chessboard pattern and camera take some photos from different angles. Images are cv.undistored with camera parameters and then result images are used for calibration with OpenCV official tutorial. As result I have projector intrinsic parameters(projector matrix).

From cv.calibrate I have rotarion and transition vectors as results but vectors count are equal to images count and I thing it is not corect ones because I move camera and projector in calibration. My new idea is to project chessboard on scanning background, perform calibration and in this way I will have Rotation vector and Transition vector. I don't know is that correct way.

Process of scanning is:

Generate patterns -> undistor patterns with projector matrix -> Project pattern and take photos with camera -> undistort taken photos with camera matrix

I use GrayCode pattern and with cv.graycode.getProjPixel and have pixels mapping between camera and projector. My projector is not very high resolution and last patterns are not very readable. I will create custom function that generate mapping without the last patterns.

I don't know how to get depth map(Z) from all this information. My confution is because there are 3 coordinate systems - camera, projector and world coordinate system.

How to find 'Z' with code? Can I just get Z from pixels mapping between image and pattern?

Information that have:

• p(x,y,1) = R*q(x,y,z) + T - where p is image point, q is real world point(maybe), R and T are rotation vector and transition vector. How to find R and T?
• Z = B.f/(x-x') - where Z is coordinate(depth), B-baseline(distanse between camera and projector) I can measure it by hand but maybe this is not the way, (x-x') - distance between camera pixel and projector pixel. I don't know how to get baseline. Maybe this is Transition vector?
• I tried to get 4 meaning point, use them in cv.getPerspectiveTransform and this result to be used in cv.reprojectImageTo3D. But cv.getPerspectiveTransform return 3x3 matrix and cv.reprojectImageTo3D use Q-4×4 perspective transformation matrix that can be obtained with stereoRectify.

Similar Questions:

• How is point cloud data acquired from the structured light 3D scanning? - Answer is you need to define a vector that goes from the camera perspective center to the pixel in the image and then rotate this vector by the camera rotation. But I don't know how to define/find thid vercor and Rotation vector is needed.
• How to compute the rotation and translation between 2 cameras? - Question is about R and T between two cameras but almost everywhere writes that projector is inverse camera. One good answer is The only thing you have to do is to make sure that the calibration chessboard is seen by both of the cameras. But I think if I project chessboard pattern it will be additional distored by wall(Projective transormation)

There are many other resources and I will update list with comment. I missed something and I can't figure out how to implement it.

I have a Lego mindstorms 51515 and like to program it with python.

There are some default image in the module I'd like to loop over and use.

I'm trying to create a ConstraintLayout to do the following;

1. on the left, a chessboard
2. on the right, controls
3. Chessboard should be a square, as big as the parent will allow
4. however at least 1/3 of parent should be left for the controls
5. importantly, if the squareness/size of the chessboard means MORE than 1/3 can be used for the control, then make the controls bigger.

Can this be done in XML? NB: obviously I can have two layouts, one for portrait, one for landscape. Happy to do this.

Beginner programmer here currently trying to learn Tkinter for a school assignment. I have a GUI class that stores the Tkinter labels etc, the labels are innitiated like this:

I am trying to solve this question from the USACO website. Problem Link: http://www.usaco.org/index.php?page=viewproblem2&cpid=1061

Farmer John has recently expanded the size of his farm, so from the perspective of his cows it is effectively now infinite in size! The cows think of the grazing area of the farm as an infinite 2D grid of square "cells", each filled with delicious grass (think of each cell as a square in an infinite chessboard). Each of Farmer John's N cows (1≤N≤50) starts out in a different cell; some start facing north, and some start facing east.

Every hour, every cow either

• Stops if the grass in her current cell was already eaten by another cow.
• Eats all the grass in her current cell and moves one cell forward according to the direction she faces.

Over time, each cow therefore leaves a barren "rut" of empty cells behind her.

If two cows move onto the same grassy cell in the same move, they share the cell and continue moving in their respective directions in the next hour.

Please determine the amount of grass eaten by each cow. Some cows never stop, and therefore eat an infinite amount of grass.

INPUT FORMAT (input arrives from the terminal / stdin):

The first line of input contains N. Each of the next N lines describes the starting location of a cow, in terms of a character that is either N (for north-facing) or E (for east-facing) and two nonnegative integers x and y (0≤x≤1000000000, 0≤y≤1000000000) giving the coordinates of a cell. All x-coordinates are distinct from each-other, and similarly for the y-coordinates. To be as clear as possible regarding directions and coordinates, if a cow is in cell (x,y) and moves north, she ends up in cell (x,y+1). If she instead had moved east, she would end up in cell (x+1,y).

OUTPUT FORMAT (print output to the terminal / stdout):

Print N lines of output. Line i in the output should describe the number of cells worth of grass that the ith cow in the input eats. If a cow eats an infinite amount of grass, output "Infinity" for that cow.

SAMPLE INPUT:

The Chessboard virus problem is similar to Conway's "Game of Life". The rule is that any two squares with infected neighbours will become infected.

I have tried to implement the simulation in Python, but there is a logic error. I think what is happening is that the board is being updated within a single round, so intermediate steps are missed. For example, with