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Questions tagged [calibration]

Use this tag for questions related to the process of adjusting the output or indication on a measurement instrument.

443 questions
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reset a printer with VB.NET

I've been working on a label system in VB web app that prints to the Toshiba TEC Barcode printers for quite a while lately and it never seems to line up properly. I've tried changing the settings, and adjusting paper size, only re-calibrating the…
Robert
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If you use a non-square (=non-NxN) grid and findChessboardCorners()

I posted this on the OpenCV forum, but so far no replies so trying here. Page 352 of the 2.4.0 reference manual has this note: Note: If you use a non-square (=non-NxN) grid and findChessboardCorners() for calibration,and calibrateCamera returns …
Dave Thomas
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touchscreen calibration

Is there an easy way, without using higher math, to calibrate a touchscreen? I have written my own LCD library and my own touchpad library, both do work great, but of course I need to calibrate the touchpad before it gets usable results. The only…
Joel Bodenmann
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Calibrating 3d Accelerometer for 2d Game

I am making a 2d game. The phone is held horizontally and a character moves up/down & left/right to avoid obstacles. The character is controlled by the accelerometer on the phone. Everything works fine if the player doesn't mind (0,0) (the point…
JohnnyV
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CORElearn package Isotonic regression calibration

Considering the following script, why does the isotonic regression calibration with this package return a full zero vector after calibration? Any idea (i asked the author of the package but he didn't answered sadly)? library("CORElearn") #Dataset…
Vincent ISOZ
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Access Compass Calibration from android app programatically

I'm writing an app to measure magnetic field, and I'd like the first thing that user sees after launching the app is a request for accessing compass calibration feature like google map with infinity or eight pattern. Is there a way to launch…
Jay Dwivedi
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What is the correct way to calibrate probabilities when you have multiclass problem?

I am training a model to predict the label (target) based on loan status e.g. 0,1,2,3. So i have 4 classes. I have so far trained a model as follows: from HyperclassifierSearch import HyperclassifierSearch X = data.iloc[:, :-1] y = data.label …
Maths12
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Read coordinates of a 4-wired-resistive touchscreen

I connected my 4-wires-Touchscreen with an Arduino Mega2560. I used the guide from: https://www.instructables.com/Resistive-Touch-Screen-on-the-DP32/. But the coordinates I'm getting from the output of my touchscreen arent't exactly enough. While…
futurepi
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how to draw a calibration plot of a binary classifier in mlr3

In mlr there was a function to draw calibration plots: ## mlr approach # train predict library(mlr) lrn = makeLearner("classif.rpart", predict.type = "prob") mod = train(lrn, task = sonar.task) pred = predict(mod, task = sonar.task) # make…
ava
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Stereo Calibration and 3D Reconstruction Issue

I am trying to perform stereo camera calibration and 3D reprojection of a calculated disparity image. For the sake of simplicity I made this example in Matlab but getting the same result in Python and OpenCV. I use this piece of code for the…
schurist
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Camera calibration at image corners

I'm using OpenCV and working on calibrating a camera, testing a charuco-type calibrator for the first time. I had many expectations about this calibrator, thinking with it I could get much closer to the corners of the image than with a standard…
Andrea Quattrini
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Improve result of minimize scipy function

I'm using minimize() function on the loop, trying to find rotation-translation matrix between pointcloud and camera pixels. As a parameters I'm giving 6 points coordinates in camera frame (uvs) and corresponding xyz (points) and calculate…
Victoria Kepler
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Android sensor accuracy

I made an android app that relies heavily on very accurate sensor data (magnetometer, gravitymeter and accelerometer). To achieve this I validate all these device sensors periodically for highest quality of service by checking the sensor status for…
chris
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OpenCV Camera Calibration mathematical background

I just started working with OpenCV and calibrated two cameras. Iam calibrating the camares in python with the use of a chess board. Iam using the functions drawChessboardCorners and calibrateCamera. Everything works fine. The documentation of these…
Moritz Schmidt
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Calibrating Adafruit LSM303 in Arduino

I have an Adafruit LSM303 accelerometer and compass attached to an Arduino Uno. I used one of Adafruit's recommended calibration sketches (see below) and got the following output: Accel Minimums: -8.55 -10.16 -14.12 Accel Maximums: 9.89 11.26 …
user8012080
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