Questions tagged [motion]

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7
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1answer
1k views

Deconvolution - Richardson Lucy vs Wiener Filter

I am studying some deconvolution techniques, In order to remove motion blur, like: Richardson-Lucy Wiener Are there any pros / cons of using one versus another? For example which are the pros / cons ...
7
votes
1answer
278 views

'Best fit' motion curve for an unachievable profile

I have a discrete function that represents a 1d position in space over time. I have a motion system that would like to achieve this curve, but, due to constraints on jerk (3rd derivative) and ...
5
votes
2answers
355 views

Using reference objects to estimate the point spread function?

I have a well-defined object and a clear image matrix of it. In subsequent frames the object moves, causing motion blur. I want to use the object as a reference to "guide" the deconvolution and ...
3
votes
1answer
373 views

Frequency tracking with huge noise

I'm working on a frequency tracking problem with noise, where the amplitude of the noise is orders of magnitude higher than the amplitude of my signal (~1000x). Some details: The signal is roughly ...
2
votes
0answers
831 views

Analyzing accelerometer data: appropriate use of rotation matrices?

I'm working on a project in which a rod is attached at one end to a rotating shaft. So, as the shaft rotates from 0 to ~100 degrees back-and-forth (in the xy plane), so does the rod. I mounted a 3-...
2
votes
0answers
88 views

How to get translation and roation data using 6DOF MPU6150

I am trying to get the position data from an IMU 6 Degrees of Freedom (MPU-6150) board using an Arduino Uno. I am trying Jeff Rowberg’s example MPU6050_DMP6.ino that may be found here. This is the ...
1
vote
2answers
200 views

State of the art motion blur recovery

Could the experts point me towards the best motion de blur algorithm? My images are blurred where I know the motion information with good precision(direction and angle) There are so many ...
1
vote
1answer
1k views

Triaxial accelerometer to single signal

I have some smartphone recorded accelerometer data, so I have acceleration along 3 axes: $$a_{x}, a_{y}, a_{z}$$ The accelerometer data was collected by securing a phone to a walking subject. I'm ...
1
vote
1answer
949 views

Accelerometer - coordinate system transformation

I'm getting some accelerometer readings from an Android phone, but it comes in on the phone's coordinate system. I want to apply a transformation to put the acceleration in the world coordinate system ...
1
vote
1answer
547 views

Correlating accelerometer data

I am getting a signal from a device. This signal contains a non-random noise signal in it. I want to remove that noise from the signal. This noise is correlated to the motion the device is having. So ...
1
vote
0answers
154 views

Accounting for Mechanical Vibration in Accelerometer Readings

I am very new to DSP so please forgive any ignorance within this post. I am working on a device which has a 6-axis IMU measuring acceleration and rotation. The device itself is attached to a ...
1
vote
0answers
48 views

Doppler Shift and Wireless Access Points

I am trying to design and implement a system that would calculate the velocity of a hand motion in smartwatch. The general idea is to calculate the Doppler Shift of each access point and find ...
1
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0answers
46 views

Get slopes of integer shift of an image in radians

I tried to reproduce the result from this paper, However I'm stuck at the Section III of the paper which involve integer shift. Two images which their phase correlation $\theta(k_1,k_2)$ was ...
1
vote
1answer
108 views

Correct method for up-sampling cross-power spectrum for sub-pixel motion estimation

Let's say I have two images, one reference($g$) and another shifted($f$). I tried to get subpixel accuracy of the motion. Here are my steps: Firstly I would calculate the normalized cross-power ...
1
vote
1answer
139 views

Motion detection one threshold over dataset

We're working on a project where we have to detect the moments where motions happen in a medical scene. I have a data set of 20 videos that are closely resemble (Same camera & configuration used, ...
0
votes
1answer
3k views

Difference between optical flow field and motion field?

I have been trying to understand the various confusing definitions of optical flow field and motion flow field but cannot wrap my head around it. Some authors use the term interchangeably other give ...
0
votes
1answer
175 views

How to analyze image quality?

I have a few sequences of images, taken at fixed camera position, that address a moving object, which means the object moves towards the camera. But all the sequences of images are the cropped images ...
0
votes
2answers
400 views

Accuracy of dense optical flow

Currently I am learning dense optical flow by myself. To understand it, I conduct one experiment. I produce one image using Matlab. One box with a given grays value is placed under one uniform ...
0
votes
2answers
1k views

Capturing images on fast moving conveyor belt

This may or may not be an image processing problem. I am developing a simple system that captures images of a part as they are being manufactured and sent out along the conveyor belt. I've solved ...
0
votes
2answers
231 views

How to form Kalman filtering matrices for a problem with variable acceleration?

Assuming we have time vector $T$ with constant time step $dt$ position vector $X$ velocity vector $V$ acceleration vector $A$ All vectors $X, V, A$ have noise on their measurement ( $n_x$ , $n_v$ , ...
0
votes
2answers
56 views

Decimation of motion

I have a motion signal that you can think of as a sequence of pairs (x,y); what would be the best approach to decimate this sequence at real time? I haven't found anything similar on the web and I'm ...
0
votes
1answer
658 views

Estimating device height from 3-axis accelerometer data (possibly by supervised learning)

I'm trying to estimate the height of my device using an cheap integrated Freescale accelerometer. First, I estimate the earth direction when measured acceleration is close to 1g, then I project the ...
0
votes
0answers
10 views

Looking for next-step ideas/ IMU data

I'm in a bit of rut regarding how to get anything useful from a data set i've created. Typically i have the following features, from a few different journeys on my bike: timestamp temp_h temp_p ...
0
votes
0answers
36 views

How do I derive complicated robotic motion models easily?

I have a filter that tracks a robot. I want it to use a 2D coordinated turn polar velocity motion model (from page 15 here): But I want to expand on this motion model: I want an additional velocity ...
0
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0answers
35 views

How can I improve my motion capture system?

Please excuse me if this is not the proper place to ask this. I just need some general advice. I have set up a very basic homemade motion capture system where I put three TrackIR cameras from ...