Search found 8 matches

by user
Wed Jul 04, 2018 10:44 am
Forum: Project Discussion
Topic: Detecting optical flow
Replies: 15
Views: 208

Re: Detecting optical flow

Thank you! there is a problem with the accumulation of the error. A median filter was applied, but the problem remained. with rectilinear forward-backward motion, the error grows. how to neutralize it?
by user
Mon Jul 02, 2018 3:48 am
Forum: Project Discussion
Topic: Detecting optical flow
Replies: 15
Views: 208

Re: Detecting optical flow

This is conditionally "absolute displacement". Used to hold the UAV in the specified position. Using a simple median filter from find_displacment will improve the results?
by user
Mon Jul 02, 2018 3:18 am
Forum: Project Discussion
Topic: Detecting optical flow
Replies: 15
Views: 208

Re: Detecting optical flow

part of the code: sum_x = 0.0 sum_y = 0.0 out_x = 0 out_y = 0 while(True): #clock.tick() # Track elapsed milliseconds between snapshots(). # Track elapsed milliseconds between snapshots(). img = sensor.snapshot() # Take a picture and return the image. displacement = extra_fb.find_displacement(img) e...
by user
Mon Jul 02, 2018 2:31 am
Forum: Project Discussion
Topic: Detecting optical flow
Replies: 15
Views: 208

Re: Detecting optical flow

I use method "differential-translation", then summing the results to obtain the absolute displacement. The framesize is 128x128.

Are there ways to improve accuracy? Maybe filtering?
by user
Thu Jun 28, 2018 10:51 am
Forum: Project Discussion
Topic: Detecting optical flow
Replies: 15
Views: 208

Re: Detecting optical flow

Is it possible to calculate the optical flow only on a part of the frame? If so, сould you show an example of using a function "find_displacement" with all variables. It was also found that when using the sensor under vibration conditions (for example, on a UAV), there is an offset hunting (to the l...
by user
Fri Jun 22, 2018 6:22 am
Forum: Project Discussion
Topic: Detecting optical flow
Replies: 15
Views: 208

Re: Detecting optical flow

it will give a delay, right? And if you move quickly, you can speed up the data output?
by user
Thu Jun 21, 2018 6:50 am
Forum: Project Discussion
Topic: Detecting optical flow
Replies: 15
Views: 208

Re: Detecting optical flow

Rate of displacement <0.5 m/s. What is meant by sample rate? Where to change it?
by user
Wed Jun 20, 2018 7:55 am
Forum: Project Discussion
Topic: Detecting optical flow
Replies: 15
Views: 208

Detecting optical flow

The task is to determine the optical flow.
From the methods presented by you, the "differentiaol_translation" method has the best characteristics of accuracy. But it does not detect a slow movement. How can this be combated?

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