Questions tagged [motion-detection]
Related to detection of motion related to programming issues, like computer vision, sensor control, etc.
motion-detection
421
questions
346
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How do I detect when someone shakes an iPhone?
I want to react when somebody shakes the iPhone. I don't particularly care how they shake it, just that it was waved vigorously about for a split second. Does anyone know how to detect this?
- 5,352
297
votes
1
answer
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Store Kinect's v2.0 Motion to BVH File
I would like to store the motion capture data from Kinect 2 as a BVH file. I found code which does so for Kinect 1 which can be found here. I went through the code and found several things that I was ...
- 5,586
38
votes
4
answers
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How can I detect and track people using OpenCV?
I have a camera that will be stationary, pointed at an indoors area. People will walk past the camera, within about 5 meters of it. Using OpenCV, I want to detect individuals walking past - my ideal ...
- 101k
18
votes
3
answers
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Optical flow ignore sparse motions
We're actually working on an image analysis project where we need to identify the objects disappeared/appeared in a scene. Here are 2 images, one captured before an action has been made by the surgeon ...
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16
votes
1
answer
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How can you track motion using the iPhone's camera?
I saw that someone has made an app that tracks your feet using the camera, so that you can kick a virtual football on your iPhone screen.
How could you do something like this? Does anyone know of ...
- 5,089
13
votes
7
answers
12k
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Android MotionEvent: find out if motion happened outside the view
I have a button and OnTouchListener attached to it. How can I find if motion (when user presses the button) happened inside or outside it? Both event.getAction() and event.getActionMasked() return ...
- 4,133
11
votes
2
answers
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Get rotation and display in degrees
I need something very simple, but I could not find a suitable example to learn from. My sole purpose is the following:
As the device is placed flat (on its back) on the desk, it should show 0 (or ...
- 7,057
11
votes
2
answers
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Motion Detection
I really cannot get my head around this, so I hope that someone can give me a little hand ^^
I'm trying to detect motion in C# via my webcam.
So far I've tried multiple libraries (AForge Lib), but ...
- 4,774
11
votes
3
answers
4k
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Detect a person's motion and identify his body parts moving forward towards camera on Android
I have this requirement where I need to detect body parts or objects moving towards camera. What are some of the sample projects or library that I can look for as a starting point.
I can take the ...
- 717
10
votes
2
answers
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What is output from OpenCV's Dense optical flow (Farneback) function? How can this be used to build an optical flow map in Python?
I am trying to use the output of Opencv's dense optical flow function to draw a quiver plot of the motion vectors but have not been able to find what the function actually outputs. Here is the code:
...
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9
votes
2
answers
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How to count steps using an Accelerometer?
I have to develop the same functionality as of this Pedometer App
I have observed this Pedometer app in very high detail.
It's not a perfect pedometer app. For example, if you stay/sit at one place ...
- 9,891
9
votes
2
answers
11k
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Visual Odometry (aka. Egomotion estimation) with OpenCV
I'm planning to implement an application with augmented reality features. For one of the features I need an egomotion estimation. Only the camera is moving, in a space with fixed objects (nothing or ...
- 7,341
9
votes
1
answer
1k
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Linear acceleration direction to track upward and downward movement of phone
I am trying to track the movement of the device only on the vertical direction, i.e. upward and downward movement. This should be irrespective of the orientation of the device. Things that i already ...
- 326
9
votes
3
answers
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How to modify motion tracking in AS3
I have this amazing tutorial at http://www.computerarts.co.uk/tutorials/build-your-own-motion-tracking-system
In the developer version, the tracker moves along the X-axis. I want it to stay stationary ...
- 605
9
votes
0
answers
9k
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How to detect movement of object on iPhone's camera screen? [duplicate]
I have an application which needs to be able to detect the movement of object or image which is shown on camera screen. Is this possible with the iPhone?
- 1,410
8
votes
3
answers
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Android: Tracking mouse pointer movement
Assuming that I am using a generic mouse, is it possible to track the X and Y coordinates of the mouse pointer in android?
- 83
8
votes
3
answers
11k
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Opencv Motion detection with tracking
I need a robust motion detection and tracking in web cam's video frames. The background is always the same. The aim is to identify the position of the object, if possible without the shadows, but not ...
- 4,250
8
votes
3
answers
10k
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OpenCV detect movement in python
My goal is to detect movement in specific region on IP camera stream. I managed to write working code, but it's based on my personal understanding.
import cv2
import numpy as np
import os
import time
...
- 654
8
votes
2
answers
10k
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Python OpenCV: Detecting a general direction of movement?
I'm still hacking together a book scanning script, and for now, all I need is to be able to automagically detect a page turn. The book fills up 90% of the screen (I'm using a cruddy webcam for the ...
- 294k
8
votes
1
answer
4k
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how to detect when MotionEvent.ACTION_MOVE is finished
I need to detect in my application when user stop moving across a specific view. I'm creating something similar to marque text in my application which can interact while user is touching the view and ...
- 14.5k
7
votes
3
answers
3k
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Matlab video processing of heart beating. code supplemented
I'm trying to write a code The helps me in my biology work.
Concept of code is to analyze a video file of contracting cells in a tissue
Example 1
Example 2: youtube.com/watch?v=uG_WOdGw6Rk
And ...
- 8,959
7
votes
3
answers
880
views
Message queue architecture when messages need to access shared data
I have to build a motion detection service. The motion detection doesn't operate on videos, but instead on just still images.
This microservice will need to be able to receive images out of order (...
- 15.1k
7
votes
2
answers
2k
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Motion Tracking vs Blob Tracking
Hi all I have a simple question that I have been struggling with....what is the difference, if any, between motion component (blob?) tracking and blob tracking? As defined by OpenCV.
Does one cover ...
- 8,505
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Editing android VideoView frames
Environment:
Nexus 7 Jelly Bean 4.1.2
Problem:
I'm trying to make a Motion Detection application that works with RTSP using VideoView.
I wish that there was something like an onNewFrameListener
...
- 18.8k
7
votes
1
answer
9k
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Motion-detector for moving camera on OpenCV
When the camera is stationary, then it is easy to detect the movement simply by subtracting the previous frame of the current frame, using optical flow:
OpenCV v2.4.9.0: Motion Analysis and Object ...
- 12.8k
6
votes
1
answer
3k
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View only registering MotionEvent.ACTION_DOWN
I'm having an interesting problem...that I can't seem to find the solution for. I'm using an ObjectAnimator to rotate an ImageView; but the onTouchListener only seems to be registering MotionEvent....
- 241
6
votes
1
answer
10k
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Detecting Significant Device Motion on Android
I've been trying to figure out how to make an application that detects whether the device has been moved a significant amount, something more than just shakes. I am trying to detect a distance of, say,...
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6
votes
1
answer
1k
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xcode ios 6 shake motion calls IBaction from previous view
I'm a bit new to app development. In a viewController ( VPviewController ) i have the following code:
- (void) motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event{
if (motion == ...
6
votes
1
answer
2k
views
Remove background and noise from image
Im trying to remove the background from a video and get a binary images( or 8-bit) where value of the object that moves is 1 and static background is 0.
something like this:
at first I tried it with ...
user4312643
5
votes
4
answers
14k
views
Detect if video file contains movement
I have a bunch of video clips from a webcam (duration is 5, 10, 60 seconds), and I'm looking for a way to detect "does this video clip have movement", to decide whether the file should be saved or ...
- 3,050
5
votes
2
answers
4k
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Polling the accelerometer/motion sensor in a MacBook Pro
There is a compiled command line application here that does this.
Is there a Cocoa API to query this data?
- 2,539
5
votes
2
answers
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Gyroscope and accelerometer data from Windows?
The Microsoft Surface Pro has a gyroscope and accelerometer, Windows 8, and the full .NET framework.
Most articles I find that talk about the motion API point to the Windows Phone 8 API.
What .NET ...
- 11.3k
5
votes
4
answers
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How to calculate where a bullet impacts on a wall (a REAL wall and bullet) [closed]
I am building a very exciting project, and I am creating this post to get new, fresh and crazier ideas.
I have a big wall, and I am shooting at it. I need to calculate the exact X and Y coordinates ...
- 1,838
5
votes
1
answer
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Motion detection using OpenCV
I see queries related to opencv motion detection, but my requirement is much simpler , so i am asking the question again .
I would like to analyse video frames and see if something has changed in the ...
- 65
5
votes
2
answers
3k
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Motion detection and simple analysis with JavaScript?
Lets assume that I have a video playing in canvas and I want to do some basic analysis on that video like edge detection, motion detection and general motion direction. How should I approach this ...
- 6,941
5
votes
1
answer
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views
How can I get all joint XYZ coordinates in ARKit 3 motion capture
I am trying to write to get all joint XYZ coordinates in ARKit 3 motion capture to getting the XYZ to find the all angles of body. but I can't find the XYZ coordinates so cant do the next step.
I am ...
- 51
4
votes
3
answers
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Is it possible to use ViBe algorithm, implemented in opencv, for systema without GPU?
I want to test ViBe algorithm for Background Subtraction. Currently I am using opencv libraries. I found out a sample implementation in opencv/samples/gpu/bgfg_segm.cpp and bgfg_vibe.cpp files. These ...
- 641
4
votes
1
answer
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Motion Vector extraction from encoded video file
I am trying to extract motion vector data from an encoded mp4 file. In a previous post I found
an answer http://www.princeton.edu/~jiasic/cos435/motion_vector.c . But I am not able to run the code ...
4
votes
4
answers
2k
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Motion detection on screenshots
I'd like to know if there is a fast algorithm that can detect parts that moved between two sequential screenshots. The algorithm should take two images and output a set of (rectangular) regions in one ...
- 90.5k
4
votes
1
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how to detect motion of iPhone 6 device? (determine whether iPhone device moved or not -smallest possible motion on x,y,z- )
I'm working on a task to determine when the iPhone 6 is moving (smallest possible move not even a shake!) at any direction (x,y or Z) .
what is the best way to achieve that?
- 831
4
votes
1
answer
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the difference between SAD and SSD
Can anyone tell me, what's the difference between SAD and SDD? I'm talking about Sum of Absolute Differences and Sum of Squared Differences.
just in in SSD u get the measure of difference in the ...
- 1,214
4
votes
1
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ARBodyTracking in iOS13: how to get real world coordinates of body joints?
I have an app that uses iOS 13 body tracking to place some markers in a human body in real time using ARKit.
.
The following code allows me to draw the markers in real time and to get their ...
- 564
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votes
2
answers
1k
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how to get time if some condition met like gyroscope reading
I want to store time as "dateString" when gyroscope reading x=0.0,y=0.0,z=0.0 & when x>0.0 && y>0.0 && z>0.0 store time as "dateString1".
I am not able to time if condition is met ...
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4
votes
2
answers
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Motion detection in compressed domain (JPEG/Mpeg4/H264)
everyone!
I process video from IP cameras and have wrote a motion detection algorithm based on decompressed video analysis. But i really something more fast. I've found several papers about ...
- 121
4
votes
1
answer
1k
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Compute global motion opencv 2.4.x C++
Here are two images, one captured before an action has been made by the surgeon and the other afterwards.
Before:
After:
Difference: (After - Before) + 128. (The addition of 128 is just to have a ...
- 2,935
4
votes
2
answers
901
views
Detecting the user's spinning motion
I have been experimenting with the Core Motion framework to detect a user spinning around, say on a merry-go-round, holding an iphone in his hand.
There are ways to detect the device motion around ...
- 1,600
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votes
1
answer
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Resources for working with video feeds in C#
I'm starting to get into a side project that I hope to pull in frames from several small IP cameras, perhaps do a bit of motion detection and redisplay them in a form with alerts.
Does anyone have ...
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views
In my program i want to detect Activities (walking,running) or location of user When Application is closed(not in Background).is it possible in ios?
In my program i want to detect Activities (walking,running) or location of user When Application is closed.is it possible ?
Description:-
i am using SOMOtionDetector Class for detecting users ...
- 747
4
votes
2
answers
5k
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Biovision Hierarchical File (BVH) Euler angle specification differences
Problem
I am trying to get features out of a BVH file by parsing it. The BVH file is exported through NUICapture, a software that captures body movement through Kinect.
All BVH example files I know ...
- 41
4
votes
0
answers
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Invensense mpu 9250: dmp
I'm trying to use the dmp to calculate quaternions. I can't understand how to get the dmp data output. I think that they are stored in some registers reachable using i2c but i don't know their address ...
- 51