1) The highlight color for selecting with the mouse is very faint.
2) The color function for coloring text is not working.
47 2012-10-08 23:16:28
Re: Basic High Speed Video Camera Considerations & Cameras (51 replies, posted in Cameras and hardware)
Full MANUAL Exposure Control vs Shutter Priority AUTO?
I have been a strong advocate for full MANUAL exposure control for high speed video where the shutter speed, aperture and ISO are set. I am not sure of the relative performance of Shutter Priority (AUTO) or the current availability of high speed video cameras (>60p fps) with Shutter Priority (AUTO). I hope that I have not steered someone away from a capable HSV camera that has Shutter Priority but no full MANUAL control, (hopefully, to be determined soon……).
Shutter Priority mode is an AUTO exposure mode that allows the shutter speed to be selected by the photographer and the camera’s AUTO exposure control to select other settings in order to get a video of the desired brightness. If Shutter Priority (AUTO) is available for video or high speed video modes then it should allow faster shutter speeds that produce smaller motion blur.
Aperture Priority mode sets the aperture and the camera AUTO adjusts the shutter speed. Motion blur would be unknown, probably rarely desirable for video motion studies.
Mode descriptions for a SLR camera: Full MANUAL, Full AUTO, Shutter Priority (AUTO), Aperture Priority (AUTO)
http://imaging.nikon.com/history/basics/04/06.htm
http://en.wikipedia.org/wiki/Exposure_%28photography%29
See discussion of lighting issues for using full Manual.
http://www.picturecorrect.com/tips/aper … nual-mode/
Exposure Compensation (‘EV’) adds or subtracts exposure when in AUTO modes.
http://imaging.nikon.com/history/basics/04/07.htm
I believe that the proper use of the term ‘Exposure’ should relate to the actual number of photons collected by the sensor. Both aperture and shutter speed affect the number of photons collected. In addition, after photons are collected and converted to electrons in the sensor, amplification of the sensor output (controlled by the ISO setting) also affects the brightness of the video. In Internet usage, the term ‘Exposure’ may not be consistently used with the idea of separating exposure (in photons) and ISO amplification (resulting output electrons).
See “best answer” reply
http://answers.yahoo.com/question/index … 308AA1q6Ti
My Casio FH100 in AUTO modes (S, A) uses both exposure and ISO together to adjust video brightness. ‘EV’ compensation is available in AUTO modes. In full MANUAL mode (M) ISO still can be left on an “AUTO” but the videos are very dark for some reason. ?
Again, I’d advise anyone interested in high speed video to get a full MANUAL exposure control camera. Unfortunately, I don’t know of any affordable HSV cameras with full MANUAL in 2012 that are now being manufactured. An AUTO exposure control HSV camera with Shutter Priority might do as well regarding shutter speed with somewhat less flexibility regarding video brightness (?). Full AUTO will select an unknown shutter speed that will likely vary with light level.
Which HSV cameras have Shutter Priority? I’m not able to say what features the many models of AUTO control high speed video cameras have and don’t have.
CAMERA SPECS. – It is often not clear in the specs, as listed, whether the spec applies only to the camera’s still photography or also to all video modes. For any camera that you are considering, it is necessary to double check the specs. The user’s manuals can be downloaded. Check with people who own the camera.
CASIO EX ZR300. The Casio Ex ZR300 does not support Shutter Priority in high speed video mode based on the following.
http://forums.dpreview.com/forums/post/42191777
According to the Casio Ex ZR300 user’s manual that I downloaded, “Note”, on page 69 -
"The A, S and M recording modes are not supported when shooting a movie, or when using the "Prerecord (Movie)" and "For Youtube" BEST SHOT scenes. In these cases, the recording mode is always Auto."
PDF: http://support.casio.com/pdf/001/EXZR30 … 0619_E.pdf
There are other similar dpreview threads that discuss the Casio ZR100 and ZR200. The new ZR1000 does not yet have a user's manual available on the Casio support website.
There are Youtube videos comparing cameras or discussing HSV and shutters.
ZR200- No Shutter Priority or full MANUAL shutter speed control.
http://www.youtube.com/watch?v=TwC4sK89d68
ZR100- Review & Comparison to the FH100, at 2:50 he is saying that the ZR100 does not have Shutter Priority to set the shutter speed.
http://www.youtube.com/watch?v=SNut_kshlYM
To see if a camera is capable of small motion blur one approach is to search on Youtube ‘golf swing & camera model’ etc. and look for motion blur from the side view of a golf swing. There is no way to know if the camera was operated to minimize motion blur.
ZR200 - Motion blur.
http://www.youtube.com/watch?v=TWZ6MsKt5sw
48 2012-09-17 14:39:21
Re: Kinovea has stopped working (4 replies, posted in Bug reports)
Wait until you hear from someone more knowledgeable but here is another thread possibly related to your problem.
http://www.kinovea.org/en/forum/viewtopic.php?id=250
My Kinovea 8.15 installation did not work on an old XP computer until I found this thread and downloaded some missing MS software.
49 2012-08-03 15:39:50
Re: Video Capture Cards? (12 replies, posted in Cameras and hardware)
Chas Tennis wrote:
velocanman wrote:.....................................................................................
Have you had any experience with the Eye-Fi with your Casio FH100 in the last six months? Did it drop any frames as you were concerned about?
AlanI have an Eye Fi card now but have not tried it yet.
[Operation - Record high speed video with a Casio FH100. After recording is complete the card acts as a wi fi connection and automatically transfers its video files to a computer.]
I just installed an Eye Fi Connect X2 4Gb card in my Casio FH100 high speed video camera. (Current card cost about $40.) It worked well and the video looked normal. The Eye Fi card recorded and transferred a 240 fps video of a few seconds, low resolution, in about a minute or less. It was under favorable conditions, close to the wireless router, etc.
I also directly transferred another video directly to my laptop using the Eye Fi wireless connection.
In my application of examining my own tennis strokes I don't have a need just now for using the Eye Fi on court. (other than fun playing with great gadgets).
(Update May 14, 2013) Thread on a golf forum discussing Eye Fi card golf applications
http://www.golfwrx.com/forums/topic/580 … try4175707
50 2012-07-11 12:34:11
Re: Video Capture Cards? (12 replies, posted in Cameras and hardware)
velocanman wrote:
.....................................................................................
Have you had any experience with the Eye-Fi with your Casio FH100 in the last six months? Did it drop any frames as you were concerned about?
Alan
I have an Eye Fi card now but have not tried it yet.
51 2012-06-29 18:49:24
Re: Basic High Speed Video Camera Considerations & Cameras (51 replies, posted in Cameras and hardware)
I have not purchased one of these, presumably, left over (?)Casio FH100 cameras so I have no first-hand experience.
On a golf forum that I visit -
1) One party in a reply was unhappy with an FH100 purchased some months ago for some issue.
http://www.golfwrx.com/forums/topic/577 … try4153339
2) Another party had gotten an FH100 set up for Japanese. He received instructions to reset it to English. There was some inaccuracy in the instructions but he soon had it working and was pleased.
Reply #13.
http://www.golfwrx.com/forums/topic/250 … try4780208
3) Another party contacted me and then purchased an FH100 from a Japanese supplier that he had found. He was very satisfied with the camera and purchase.
I have also seen some "used - like new" on Amaz... $450.
52 2012-06-22 17:40:44
Re: Good camcorders (1 replies, posted in Cameras and hardware)
For your interests do you know yet if you need high speed video?
Sorry to say I don't know of an affordable high speed video camera in current production that offers MANUAL exposure control. Casio last produced the Ex FH100 in about 2010. I have seen a few new FH100s recently advertised from Japanese sellers. ? Casio cameras with manual exposure control are also available used.
If your analysis is not too demanding, for now you might look at 60p cameras to get started.
See also
53 2012-05-31 19:58:41
Re: Video Capture Cards? (12 replies, posted in Cameras and hardware)
I do not have experience using an Eye Fi card. My Casio FH100 will record high speed video and then wirelessly transfer the video files to a nearby computer. Soon I'll try an Eye Fi card for low resolutions HSV clips. The FH100 camera was advertised as 'supporting' Eye Fi so you would have to research compatibility.
54 2012-05-11 14:26:18
Re: [Brainstorm] - Trajectory from a list of points (5 replies, posted in Ideas and feature requests)
joan wrote:
Chas Tennis wrote:In your example, is the analyst manually identifying the blurry ball images and placing a marker? So that with given a set of sparse markers with some missing frames a track is to be placed?
Yes. For cases when the video quality is insufficient and can't be improved.
It wouldn't be a track in the same sense as the track tool though, just a curve spanning multiple frames.What doesn't satisfy me entirely with rebuilding the curve from chronological order, is that it will be very specific to this type of problem. Wouldn't be able to connect dots on the same image for example, while that might be useful in some other instances.
I can't think of a simpler way to express the order in which the curve should be built…
No good answer here. Don't take literally as this is just to see what might be useful -
Disregard sensor scanning artifacts such as rolling shutter or interlaced scanning that may put a ball image in one frame or the next and make the frame time uncertain. ? Scanning artifacts are unique for each model camera and probably each recording.
The analyst could trace the complete smeared image of the ball as best can be done to produce a small line. These ball smears would be inaccurate and appear as little straight lines at best. These smears are part of the trajectory.
A ball flying around the court would always fall under gravity and be subject to aerodynamic accelerations due to its spin.
Vz = Vzo - gt + az(V)t
Vx = Vxo + ax(V)t
Vy = Vyo + ay(V)t
Where Vz is the vertical velocity, Vx and Vy are velocity components in two other orthogonal directions. Vzo, Vxo,Vyo are initial velocity components at time t = 0. V is the magnitude of velocity that produces the aerodynamic forces. az,ax,ay are components of the aerodynamic acceleration vector - slowing air resistance and spin/Magnus force which, I guess, is always perpendicular to the trajectory. t is time
Gravity works on Vz so that the trajectory always curves downward. If you had a ball smear, a small straight line, how would it proceed to a later ball smear? It would always bend downward from just extending the straight line of the earlier ball smear.
The spins and aerodynamic forces, which can be in any direction, are unknown.
Vertical Z - Gravity + Aerodynamic Forces - For tennis and probably all other sports where ball spin curves the trajectory, I'd say that gravity is considerably the larger force. I can't think of any sport with a spinning ball that in level flight would rise up against gravity due to aerodynamic forces. Exceptions? For connecting the ball smears ignore aerodynamic forces at first or research the magnitude of spin effects for the sport.
Horizontal X & Y- = 0 Gravity + Some Unknown Aerodynamic Forces
Bounces - the ball smear has to be associated with the right trajectory before or after the bounce.
FYI - Paper on the kick serve with its spin, aerodynamic and bounce issues. http://twu.tennis-warehouse.com/learnin … kserve.php
The discussion has been in terms of an x,y,z coordinate system. The location of the ball has to be translated into its position in the camera's frame. A camera locates the angle of the light source in relation to its pointing axis. The 3D space of the squash court has to be projected onto the 2D camera sensor. Think of a pin hole camera in order to see how the projection works (forget the lens except that the pin hole is placed at the focal length of the lens).
This stuff has probably been researched for the tennis line calling video system, Hawk-Eye.
55 2012-05-04 14:24:04
Re: [Brainstorm] - Trajectory from a list of points (5 replies, posted in Ideas and feature requests)
As always, first I think the camera and lighting should be optimized for the application to whatever extent is reasonable and affordable.
In your example, is the analyst manually identifying the blurry ball images and placing a marker? So that with given a set of sparse markers with some missing frames a track is to be placed?
56 2012-04-22 21:30:48
Re: Basic High Speed Video Camera Considerations & Cameras (51 replies, posted in Cameras and hardware)
Yesterday, April 21, I was searching new & used prices for Casio Ex FH100 cameras, which I believe are currently out of production. I was surprised to find a few new ones from a Japanese supplier.
http://www.ebay.com/sch/items/casio%20e … 2442975195
For those interested in full MANUAL exposure control, very fast shutter speeds and minimum motion blur......................
57 2012-04-22 21:09:18
Re: Basic High Speed Video Camera Considerations & Cameras (51 replies, posted in Cameras and hardware)
FYI
Website with a listing of affordable high speed video cameras.
I have been looking for a website that lists high speed video cameras. This site is the best that I have found so far, helpful to find cameras. I am not sure if it lists from all available cameras or only those sponsored in some way by retailers or manufacturers. You can select frame rate, camera type, etc.
Update link (1/23/2013)
http://snapsort.com/explore/best-digica … ths-recent
If your interest is in high speed video disregard the Snapsort ratings as they pertain to all camera operation modes including stills.
(Of course there are also many very high performance high speed video cameras including HD ones. These are much more expensive.)
The issue of MANUAL exposure control and AUTO exposure control has been discussed in this thread. MANUAL can produce the minimum motion blur that is desirable for sharp high speed videos of rackets, ball impacts, etc. I believe that only the discontinued Casio F1, FH20, FH25, and FH100 (2010) have been offered with full MANUAL. I don't believe that there are any affordable new HSV cameras now offered with full MANUAL control, all are AUTO. Still, a $120 camera with AUTO & 240fps could show you a great deal.
58 2012-04-16 18:38:03
Re: Playstation Eye (PsEye) poor video quality (2 replies, posted in Cameras and hardware)
Could you describe the image quality issues?
1) First, the camera almost certainly has an AUTO exposure control. Usually the AUTO control chooses a shutter speed that will be very slow. Motion blur will result unless object velocities are very low. The only thing to do is to take the camera out into direct sunlight and hope that the AUTO control logic will select a very fast shutter speed.
2) Second, another problem that becomes more likely as the spatial resolution is increased (increased sensor scan lines) is Jello Effect distortion. Rapidly moving objects may falsely bend down or across the frame because all areas of the frame were not captured at the same instant.
See earlier Basic Camera Considerations thread.
59 2012-03-20 19:06:46
Re: Cannot get Casio FH100 to be recognised as a capture device (1 replies, posted in Cameras and hardware)
I don't believe that there is an output on the FH100 for live video but I'm not 100% certain.
See Reply #3 and the ones at the end of the thread.
http://www.kinovea.org/en/forum/viewtopic.php?id=435
Suggest also that you look at the User's Manual for computer or TV operations.
(I have tried to determine if the FH100 with Eye Fi card could be used to immediately view the camera recording on an iPad but have not found that information.)
60 2012-01-27 05:00:05
Re: Optimizing markers for tracking (20 replies, posted in General)
That is exactly the information that I have been looking for!!
It is easy to see why I could not see forearm pronation at the same time as internal shoulder rotation(ISR). Forearm pronation occurs while the elbow is still bent before the semi-straight arm position, internal shoulder rotation and impact. Forearm pronation is difficult to see without well placed markers on the wrist and elbow.
Thanks!
Some considerations for your golf set up-
Standard Approach: For most golf swing analysis the Casio FH100 and earlier Casio cameras with manual shutter speed control (at about 240 fps) do a completely adequate job in outdoor light. For tennis I have put black tape markers near my elbow bones to indicate upper arm rotation (internal shoulder rotation). One early test indicated that Kinovea could track the black tape on my arm. I did not pursue farther to optimize the tracking. Other convenient markers might be, for example, circles on dark background clothes or sweat bands with bright circles. For golf swing tracking in strong sunlight illumination this seems like a feasible tracking approach.
Retro Reflective Tape & Illumination: To illuminate the few square meters of a golf swing in direct sunlight or with overcast skies seems very difficult. To send a strong beam onto a much smaller area might be feasible. ? Using a very large mirror behind the camera lens to reflect the sunlight onto the golf swing might also work to illuminate retro reflective tape. But a large mirror is a cumbersome set-up and the reflection would disturb the golfer.
LEDs on the Golfer: On an overcast day directional LEDs placed on the golfer and club with output beams aligned toward the camera lens should be visible in the video. In direct sunlight? But if the LEDs change pointing angle too much the signal will go down or be lost. Directional LEDs worked for the bicycle application indoors. Probably also workeable for runners and other applications where alignment is maintained. (For tennis applications where everything turns this alignment issue seemed a big problem to me.) Diffuse LED's don't have as much sensitivity to alignment but they will be much less bright for outdoor applications.
Camera Lens: For accuracy avoid extremely wide angle lens set-ups where the magnification at the center of the image is considerably greater than toward the edges. The more telephoto lens with the camera farther from the object the more 'flat' and accurate the image will be.