Sport Stop
Sports video analysis – sets the camera
Planning to take a new DV camera that can be used to film the children and your tennis serve, too? Then the camera right is important to help you get excellent film analysis and make your sports video analysis Sports clearer performance. We have selected some of the camera specifications more important for sports analysis and listed in this article.
Speed and size
Like most sports, good game camera needs analysis speed and size. There is a speed different and some measures of the size of a camera and they are discussed below.
Speed Frame
Most cameras DV off the platform has a standard frame rate of 30 frames per second or fps (NTSC) in North America and 25 fps (PAL) in most of the rest of the world. It means that the camera records 30 frames per second, an image every 0.03333 seconds. 30 frames per second is the speed at which the most regular television is recorded and displayed. When these 30 images are read at full speed every second, our brain is unable to distinguish between different images and one see smooth video.
However, if we want to analyze a tennis serve, so we need to slow down to watch our video and each of these 30 images of each second and this is a problem may arise. As the service is usually fast movement, we will probably find that if we do not record 30 fps, then the arm looks like a blur of motion during the serve and we will not be able to analyze correctly. To resolve this problem, we can record the movement at a higher rate through, for example 60 frames per second and get double the amount of pictures every second. This will give us more data to analyze and reduce the possibility that the motion will be blurred.
In general, we can more frames per second capture the best of our analysis can be. Fortunately there is a limit. In most sports in the analysis of body movements Rights 250 fps is enough. If we then want to include said golf club or tennis racket and analyze its motion, we again need higher speeds can be up to 500 fps.
Unfortunately there are very few off the shelf, commercial cameras that can record high refresh rate. You can find cameras that can record 60 frames per second, but if you want to go higher, the costs can increase substantially. We believe that a Camera 60 frames per second is a perfect start to your own analysis.
Shutter speed
We can free ourselves with the usual 30 fps as long as we have a fast shutter speed. The shutter speed determines the length of exposure, or how long the camera sensor is open to receive light and therefore save the frame. In sports analysis over the shutter speed the more blur our picture will be. However, there is a compromise – a faster shutter speed to allow less light on the camera sensor and therefore if we use a shutter speed, we must ensure we have adequate lighting that we have discussed in the last blog. When you look at a camera for analysis sports, watch the shutter speed and whether it is manually adjustable. A device that automatically adjusts its shutter speed to lighting conditions can make you forget the importance of ensuring a good light on the subject.
Resolution
We all know about the resolution HDTVs. high definition television can display images in high definition if they were recorded by a high definition video camera. The resolution of a video camera is a measure of how many pixels in our camera sensor a. Fortunately for us, Most manufacturers of video cameras are doing HD cameras with about 1920×1080 pixels or 2.3 Mega pixels. Of course, higher resolution is always better, just as it is on our televisions.
Lens Choice
There are two important aspects of a target for sport performance capture, the aperture (f-stop) and focal length and optical zoom.
Opening
Opening or f-stop is a measure of the amount of light the lens of the camera will by. A lower number will allow more light into the camera and higher number less light. Most DV cameras have f-stops down to 2.5, which is pretty good for the sport for analysis. Again, while as with the shutter speed is a compromise. A lower f-stop can often result in a lower resolution image. This does not mean that the camera sensor has less resolution but there is a compromise with the lighting and quality. Again this points to ensure that you have a good source of light for your records. With a good light source, you can use a lower f-stop and therefore obtain a better image resolution.
Focal length
The focal length is the distance between the lens of the camera sensor. A smaller focal length means that the camera captures a wider angle of view and see more in the frame, while a long focal length of the camera can see more details later. Focal length and optical zoom are therefore linked. Optical Zoom of course we can zoom in or out of an athlete.
Most DV cameras are equipped with an optical zoom and read something as 49-735mm, which is the range of focal lengths that can be achieved with this device.
The more we have optical zoom as far as we can be while still to record brilliant images for analysis. Now its up to us to use the optical zoom effectively positioning our athletes properly in the field vision. Check http://videosportsanalysis.blogspot.com/ for more details.
So not deceived by a digital zoom. Digital zoom is not our friend and if it is used can significantly reduce our effective resolution sensor. It is far better to reposition our camera closer to the athlete to use the digital zoom.
We hope these tips help you if you're looking to choose a new DV camera for the analysis of sports. Remember though, any camera can work, but if you want more details you should make sure that you have saved the details with your camera. You can not analyze the details you have not.
About the Author
Dudley Tabakin is Co-Founder of Sadaka, LLC http://videosportsanalysis.blogspot.com, a motion capture and biomechanics consultancy. Clients include FootJoy, Titleist, Warrior Hockey, Vicon Motion Systems, Innovision Systems Inc. and other Sports and Motion capture and biomechanics software companies
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