Adapt the Enable/Disable functionality as the BioTracker core functionality changed in ticket BioroboticsLab/biotracker_core#90

tracked a point for a few frames, deleted it, red rectangle over almost the entire video frame popped up

user might forget renaming the output file and lets him / her accidentally overwrite it

BioroboticsLab/biotracker_core#90

similar to #21

drawing the history red makes users freeze thinking they might have erased their previous work

the biologists need to encode behavior alongside the track. We could use a number of codes that the user can enter via the keyboard (for example numbers 1 to 9) and the trajectory to be serialized contains the characters (or better numbers) that were pressed with the respective frame number. '1' could represent the start of a behavior, and '2' the end.

Mak it easier to decide where to put the export data

to upload images...

gcc version 5.2.1 20150922 (Ubuntu 5.2.1-18ubuntu1)

0f933bc

Windows build:
Using any of the two tracker specific sliders causes an instant crash.

when the user has finished tracking all objects and opens a new video file the tracker should reset the trajectory object

(optionally check whether same video is opened again)

Point status:
[ ACTIVE (only 1), INACTIVE (n-1), VALID, INVALID]
Invalid points -> Change color, maybe pause video (use options)
Show numbers for each point

[CTRL] click creates a new point
[SHIFT] makes a point active
[KEY] to force-set a point
normal click changes current ACTIVE point position

We must be able to delete specific points

Enable/Disable track

I find it hard to come up with an optimal window size. From looking at the video I know which region should be occupied. It'd be nice to update the circle diameter whenever the window size is changed.

it would be nice to see the last N positions back in time

i tracked a point over a sequence of frames
then unchecked the "enable tracking" box
click on new position
forward video one frame
--> point isnt visible anymore

doesnt work. this is due to the track function not being executed when the tracker is loaded.

Create checkbox that allows users to only track the currently selected point

now the point is drawn in red but this can get messy having many deleted points. I would expect the point going away when deleting it.

after advancing the video I sometimes lose the point. zooming out revealed: point is invalid and outside image borders.

going back one frame (without tracking) and re-tracking the point yields a perfect position (object wasnt really moving much)

please investigate

this is what I did:

1. open video
2. open tracker
3. ctrl + lmb

First tracking could not be recorded as some data must be initialized. Please try again.

1. again ctrl + lmb

First tracking could not be recorded as some data must be initialized. Please try again.

1. AGAIN ctrl + lmb

let's discuss here whether it should really take three clicks to init a point

;)

At the moment, a fixed window is given to LK to find the next point or to find an ideal point: however, this has the implication that the tracker works differently when videos with different resolutions are used. Id suggest to use an (user-)adaptive window size so that the algorithm works reasonably well with different video sizes and types.

I tracked a point through a numer of frames, deactivated the tracking checkbox, seeked forward a few frames and wanted to set the new position of the object (by left-clicking) but the point won't show up.

As a workaround I skip one frame back and one forward again (with the tracking enabled) and the point appears again.

When tracking is disabled, points disappear and do not reappear when tracking is enabled again. It should be possible to keep old tracking points when disabling tracking though. @timlandgraf Please elaborate what the best solution for the users would be here.

please select a new point since it is more likely that the user wants to continue tracking this one

After tracking a point through a number of frames it might happen that the user seeks back to delete possibly unwanted positions.

I experienced that deleting a point (by pressing "d") doesn't work on the currently active point unless I select it again (shift + left click).

when having tracked a few frames the program crashes on video reload:

void LucasKanadeTracker::updateCurrentPoints( ...

--> assert(positions.size() == m_trackedObjects.size());

this is what I did:

• opened video
• open tracker
• track a bit
• open tracker again
  --> crash

I encounter a weird bug that is often happening when i leave the tracker for like a minute or so.

note that I am running the tracker in a virtualbox

when I return from windows to the tracker and advance the video one frame the next frame is displayed correctly, the tracker finds a correct position, but then, for all following frames, nothing happens, the video is frozen.

when I click the play button the video area becomes black, the video control buttons switch to pause instead of play, etc, but the slider doesnt move. GUI is still responsive but no graphics content is displayed

when reloading the video, the tracker correctly displays previously found positions and everything works fine.

I tested moving the focus from VM window to some my browser in windows, wait for a short time and go back to the VM.

30 seconds: freezes (tested 2 times)
25 seconds: freezes (tested 4 times)
20 seconds: still works (tested 3 times)
15 seconds: stll works (tested 2 times)

all tests were consistent.

any idea?

https://github.com/Itseez/opencv/blob/master/samples/cpp/lkdemo.cpp

I created two points (on the same frame)

tracker seems to properly track both points for only one frame, then second point gets lost