Digital Sports
Digital Sports
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Sports Digital Chronograph Wrist Watch waterproof Black $0.99 |
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Mens Lady Dual Core Dial Digital Sport Watch Waterproof $0.01 |
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NEW DESIGN DIGITAL DARK BLUE SPORT WATCH WATERPROOF MEN $0.01 |
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OHSEN Military Army Digital Analog Alarm Sport Watch WR $0.01 |
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Jelly Digital LED Watch Alarm Sports Unisex Fashion + $0.99 |
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Men Lady Sport Mirror Digital LED Watch Brown Silicone $0.99 |
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Military Ladys/Mens Digital Sports Quartz Date Watch $0.01 |
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OHSEN New Led Day & Date Digital Boys Girls Sport Watch $0.01 |
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Water Resistant Sports Digital Multi-function Watch $7.66 |
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Trendy LED Date Display Mens/Ladys Digital Sport Watch $0.01 |
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Jelly Digital ODM Style Sports Unisex Watch Dark-Blue+ $0.99 |
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New Red LED Luxury Date Digital Mens Sport Black Watch $4.08 |
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Trendy RED LED Light Rubber Digital Sports Wrist Watch $0.01 |
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RED LED DATE DIGITAL MEN SPORT ALARM ANALOG WRIST WATCH $0.99 |
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Chrono Digital Alarm Military Mens Boys Sports Watch $0.01 |
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Sports Digital waterproof Chronograph Wrist Watch Blue $0.99 |
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NEW-Red LED Digital Men Lady Sport Wrist Watch white $0.01 |
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OHSEN Digital Chronograph Black Mens Lady Sports Watch $0.99 |
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Luxury Sport LED Digital Date Lady Men Watch White E1 $0.01 |
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Digital Chronograph Diver Mens Lady Sports Watch OHSEN $0.99 |
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Quartz Dual Digital Chronograph Sports Wrist Watch Aqua $0.99 |
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Digital Chronograph Sports Stopwatch with Neck Strap $6.30 |
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New Men’s Black Digital Analog Date Sport Watch $0.99 |
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OHSEN Digital Alarm Lady Girl Sport Watch Waterproof $0.01 |
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Dual Time Digital Date Alarm @ Men’s New Sport Watch $0.01 |
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OHSEN LED Quartz Analog Digital Stop Mens Sport Watch $0.01 |
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New Red LED Luxury Date Digital Mens Sport White Watch $2.85 |
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Luxury Sport Style LED Digital Date Lady Men Watch, X50 $3.25 |
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New Waterproof Red LED Date Digital Womens Sport Watch $0.01 |
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Omron Body Fat Monitor and Scale Fat loss monitor with scale. Easy to read 2″ extra large digital display. Measures body fat percentage in .1% increments. Weight capacity up to 330 lb (.2 lb increments). Four person profile memory plus guest mode. Displays previous reading. Chrome metallic finish…. |
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Salter 914 Electronic Baby and Toddler Scale $99.99 Electronic baby and toddler scale in onecomfortable, securely fitted weighing tray to safely keep baby in placeconverts to a toddler scale by simply removing the tray’hold’ function keeps accurate weight in display even when baby moves abouteasy read large 31mm/1.2″ LCD weight readoutauto zero and auto shut-off10 year guarantee20kg x 10g 44lb x 1/2 ozbattery type: 9V alkaline (not included)10 year… |
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Margaritaville DM1000 Frozen Concoction Maker $299.99 Cool down as you dip your feet into the warm crystal waters of Margaritaville. This easy-to-use appliance makes all your favorite frozen drinks, shaving ice and automatically mixing the perfect proportion into the other ingredients. One-year limited warranty…. |
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Cars (Spanish Language Widescreen Edition) $14.60 A young stock car named Lightning on his way to a big race is kept in town to repair damage he caused and he begins to see the townsfolk, various moto… |
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Sporty Baby:Golf $15.29 SPORTY BABY:GOLF – DVD Movie… |
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Baby Pro: Let’s Play Ball: Baseball- Basketball- Soccer Sports $10.95 BabyPro Let’s Play Ball DVD For your aspiring lil slugger, the BabyPro Let’s Play Ball DVD is a vibrant, stimulating instruction to baseball, basketball, and soccer. Most sports imagery is quick-paced and features many players, a format which is difficult for babies to follow. BabyPro uses bright, vivid sports imagery and slow-motion action sequences to depict the progression from baby to pro. L… |
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Rudy [VHS] $1.69 This 1993 film by David Anspaugh (Hoosiers) is slowly building a reputation as a minor highlight of ’90s movies. Based on a true story, Rudy stars Sean Astin as Rudy Ruettiger, a blue-collar kid whose father (Ned Beatty) worships Notre Dame football but who would never dare to dream that any of his sons could be a part of the team. The film is entirely about Ruettiger’s ceaseless if sometimes wave… |
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Manon of the Spring [VHS] $4.79 Less a sequel than a seamless continuation of its predecessor, Jean de Florette, Manon of the Spring brings with it a more epic scope as it depicts the growth to womanhood of the daughter (Emmanuelle Béart) of the doomed farmer of the first film. As she discovers the truth of what happened to her father as a result of the scheming of their neighbor (Yves Montand), who took the land for himself, s… |
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Rocky 3 [VHS] $1.44 Movie DVD… |
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Kryptonite Kryptolok Series 2 Standard Bicycle U-Lock (4-inch x 9-inch) with 4-Foot Flex Cable $31.48 Kryptonite Series 2 U-Locks made with a 13mm hardened performance steel shackle with classic bent foot design and a patented deadbolt locking mechanism. 13mm hardened performance steel shackle with classic bent foot design. Patented deadbolt locking mechanism and offset key locationKey Safe and Authentic registration and replacement program. $1,500 anti-theft protection… |
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Kryptonite Keeper 12 Standard Bicycle U-Lock with Bracket Bicycle U-Lock (4-Inch x 8-Inch) $15.98 Kryptonite Keeper U-Locks Item Specifications: Lock Size 4×9 Bracket… |
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Leatherman 830039 New Wave Multitool with Leather/Nylon Combination Sheath $93.00 The New Wave multitool from Leatherman features improved pliers and wire cutters, externally locking knives, a file, and a saw. All the internal tools are positive locking and include scissors, flat 1/4-inch bit driver with Phillips head, flat screwdrivers, can opener, reversible eyeglass screwdriver and wire Stripper. Comes with handy leather sheath. Made in USA with Domestic and foreign parts…. |
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Xanadu – Magical Musical Edition (With Complete Soundtrack CD) $12.67 With the help of muse Kira, struggling artist Sonny and aging musician Danny create a roller disco…. |
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Dr. Nicholas Romanov’s Pose Method of Running $44.95 Learning how to run doesn’t get any simpler! The Pose Running DVD contains all the information you need to understand what running is and how to learn to run the right way! Used by everyone from amateur runners to Olympic & National team members of USA, Great Britain, Russia and Mexico. Dr. Nicholas Romanov, the Russian sport science professor and British National Triathlon team coach, teaches yo… |
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Billabong Odyssey $8.37 Check out this action packed Surf DVD, ‘Billabong Odyssey’…… |
Video Analysis Of Sports – The Camera Specs
Planning to pick up a new DV camera that can be used to film the kids and your Tennis serve too? Then getting the right camera is important to help you obtain excellent sports analysis footage and make your video analysis of sports performance clearer. We have picked out some of the most important camera specifications for sports analysis and listed them in this article.
Speed and Size
Like most sports, a good sports analysis camera needs speed and size. There are a few different speed and size measures of a camera and they are discussed below.
Frame Speed
Most off the shelf DV cameras have a standard frame speed of 30 frames per second or fps(NTSC) in the North America and 25 fps (PAL) in most of the rest of world. What this means is that the camera records 30 pictures every second, one picture every 0.03333 seconds. 30 frames per second is the speed at which most regular television is recorded and viewed. When these 30 frames are played back at full speed every second, our brain is unable to distinguish between the individual pictures and we see a flowing video.
However, if we want to analyze a tennis serve then we need to slow down our video and look at each one of these 30 frames of every second and this is where a problem may arise. As the serve is generally a quick motion, we will probably find that if we only record 30 fps then the arm will look like a blur during the serve motion and we will be unable to analyze it properly. To solve this problem we can record the motion at a higher frame rate, say 60 fps 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 the more frames we can capture per second the better our analysis can be. Luckily though there is a limit. In most sports when analyzing the human body movement 250 fps is sufficient. If we then want to include say the golf club or tennis racket and analyze its movement, we once again need higher speeds maybe up to 500 fps.
Unfortunately though there are very few off the shelf, commercial cameras that can record high frame rates. You can find some cameras that can record 60 fps, but if you want to go higher, costs can increase substantially. We think a 60fps camera is a perfect start for doing your own analysis.
Shutter Speed
We can get away with the usual 30 fps as long as we have a high shutter speed. Shutter speed determines exposure time, or how long the cameras sensor is open to receive light and therefore record the frame. In sports analysis the higher the shutter speed the less blurred our image will be. However there is a trade off – a faster shutter speed will allow less light onto the cameras sensor and therefore if we use a high shutter speed we need to make sure that we have sufficient lighting as we discussed in the last blog. When looking at a camera for sports analysis, look at the shutter speed and whether it is manually adjustable. A camera that automatically adjusts its shutter speed to the lighting conditions can make you forget the importance of ensuring good lighting on your subject.
Resolution
We all know about resolution from high def televisions. High def television can only display those high definition images if they were recorded by a high definition video camera. The resolution of a video camera is a measure of how many pixels our camera sensor has. Luckily for us most video camera manufacturers are now making HD cameras with about 1920×1080 pixels or 2.3 Mega pixels. Of course a higher resolution is always better just like it is on our TVs.
Lens Choice
There are 2 important aspects of a lens for sports performance capture, aperture (f-stop) and focal length and optical zoom.
Aperture
The aperture or f-stop is a measure of the amount of light the lens of the camera will allow through. A lower number will allow more light into the camera and a higher number less light. Most DV cameras have f-stops as low as 2.5 which is good enough for sports analysis purposes. Once again just like with shutter speed there is a trade off. A lower f-stop can often result in a lower resolution image. This does not mean that the cameras sensor has less resolution but that there is a trade off with lighting and quality. Once again this points to making sure you have a good light source for your recordings. With a good light source you can use a lower f-stop and therefore obtain a better resolution image.
Focal Length
The focal length is the distance from the lens to the camera’s sensor. A smaller focal length means that the camera will capture a wider angle of view and see more in the frame, while a large focal length allows the camera to see more details further away. Focal length and optical zoom therefore are linked. Optical zoom of course allows us to zoom in or away from an athlete.
Most DV cameras come equipped with optical zoom and will read something like 49-735mm, which is the range of focal lengths that can be achieved with this camera.
The more optical zoom we have the further away we can be while still recording excellent footage for analysis. Now its up to us to use that optical zoom effectively by positioning our athlete correctly in the field of view. Check out http://videosportsanalysis.blogspot.com/ for details.
Also don’t get tricked by digital zoom. Digital zoom is not our friend and if used can reduce our actual sensor resolution considerably. It is far better to reposition our camera closer to the athlete than make use of digital zoom.
We hope these tips help if you are looking to choose a new DV camera for sports analysis. Remember though, any camera can work; but if you want more detail you need to ensure that you recorded the detail with your camera. You cannot analyze details you do not have.
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