What Does 30fps Mean?
What does 30fps mean? Our daVideo Rikor video camera glasses record in super fast frame rate of 60fps and 30fps, but what does this mean?
Frames per second (FPS) is a unit that measures display device performance. It consists of the number of complete scans of the display screen that occur each second. This is the number of times the image on the screen is refreshed each second, or the rate at which an imaging device produces unique sequential images called frames.
Each frame consists of a number of horizontal scan lines. These represent the number of scan lines per frame.
Currently, there are three main FPS standards (plus a few others) used in TV and movie making: 24p, 25p and 30p (The “p” stands for frame progressive).
30p imitates a film camera’s frame rate.
24p is widely used when transferring a video signal to film.
25p is used for direct compatibility with television. It also works better for progressive scan output to LCD displays and computer monitors and projectors.
High-end high definition TV (HDTV) uses 50p and 60p progressive formats.
72p is an experimental format.
The greater the FPS, the smoother the video motion appears. Full-motion video is usually 30 FPS or greater. Different formats of video files have different FPS rates. Slower FPS rates produce smaller computer files.
Some of the first 3D video games used a frame rate of only 6 FPS. In today’s action-oriented games, the frame rate may range from 30 FPS (for example, in “Halo 3″) to over 100 FPS (as in”Unreal Tournament 3”). Computer game enthusiasts may use the FPS ratings of a game to demonstrate computer power and efficiency.
What is Frame Rate?
Frame rate (expressed in frames per second or fps) is the frequency (rate) at which consecutive images called frames appear on a display. The term applies equally to film and video cameras, computer graphics, and motion capture systems. Frame rate may also be called the frame frequency, and be expressed in hertz.
Frame rate and human vision
The temporal sensitivity and resolution of human vision varies depending on the type and characteristics of visual stimulus, and it differs between individuals. The human visual system can process 10 to 12 images per second and perceive them individually, while higher rates are perceived as motion. Modulated light (such as a computer display) is perceived as stable by the majority of participants in studies when the rate is higher than 50 Hz through 90 Hz.
This perception of modulated light as steady is known as the flicker fusion threshold. However, when the modulated light is non-uniform and contains an image, the flicker fusion threshold can be much higher, in the hundreds of hertz. With regard to image recognition, people have been found to recognize a specific image in an unbroken series of different images, each of which lasts as little as 13 milliseconds. Persistence of vision sometimes accounts for very short single-millisecond visual stimulus having a perceived duration of between 100 ms and 400 ms. Multiple stimuli that are very short are sometimes perceived as a single stimulus, such as a 10 ms green flash of light immediately followed by a 10 ms red flash of light perceived as a single yellow flash of light.
Film and video
Early silent films had stated frame rates anywhere from 16 to 24 frames per second (fps), but since the cameras were hand-cranked, the rate often changed during the scene to fit the mood. Projectionists could also change the frame rate in the theater by adjusting a rheostat controlling the voltage powering the film-carrying mechanism in the projector. Film companies often intended that theaters show their silent films at higher frame rates than they were filmed at.
These frame rates were enough for the sense of motion, but it was perceived as jerky motion. To minimize the perceived flicker, projectors employed dual- and triple-blade shutters, so each frame was displayed two or three times, increasing the flicker rate to 48 or 72 Hertz and reducing eye strain. Thomas Edison said that 46 frames per second was the minimum needed for the eye to perceive motion: “Anything less will strain the eye.” In the mid to late 1920s, the frame rate for silent films increased to between 20 and 26 fps.
When sound film was introduced in 1926, variations in film speed were no longer tolerated, as the human ear is more sensitive to changes in audio frequency. Many theaters had shown silent films at 22 to 26 fps—which is why the industry chose 24 fps for sound as a compromise. From 1927 to 1930, as various studios updated equipment, the rate of 24 fps became standard for 35 mm sound film. At 24 fps the film travels through the projector at a rate of 456 millimetres (18.0 in) per second. This allowed for simple two-blade shutters to give a projected series of images at 48 per second, satisfying Edison’s recommendation. Many modern 35 mm film projectors use three-blade shutters to give 72 images per second—each frame is flashed on screen three times.
In drawn animation, moving characters are often shot “on twos”, that is to say, one drawing is shown for every two frames of film (which usually runs at 24 frames per second), meaning there are only 12 drawings per second. Even though the image update rate is low, the fluidity is satisfactory for most subjects. However, when a character is required to perform a quick movement, it is usually necessary to revert to animating “on ones”, as “twos” are too slow to convey the motion adequately. A blend of the two techniques keeps the eye fooled without unnecessary production cost.
Animation for most “Saturday morning cartoons” is produced as cheaply as possible, and is most often shot on “threes”, or even “fours”, i.e. three or four frames per drawing. This translates to only 8 or 6 drawings per second, respectively. Anime is also usually drawn on threes.
Modern video standards
Modern video formats utilize a variety of frame rates. Due to the mains frequency of electric grids, analog television broadcast was developed with frame rates of 50 Hz or 60 Hz, sometimes with video being interlaced so more motion information could be sent on the same available broadcast bandwidth, and sometimes with video being broadcast at 25 or 30 fps with each frame doubled. Film, which was almost universally shot at 24 frames per second, could not be displayed at its native frame rate, which required pulldown conversion, often leading to “judder”: to convert 24 frames per second into 60 frames per second, every odd frame is doubled and every even frame is tripled, which creates uneven motion.
Other conversions have similar uneven frame doubling. Newer video standards support 120, 240, or 300 frames per second, so frames can be evenly multiplied for common frame rates such as 24 fps film and 30 fps video, as well as 25 and 50 fps video in the case of 300 fps displays. These standards also support video that’s natively in higher frame rates, and video with interpolated frames between its native frames. Some modern films are experimenting with frame rates higher than 24 fps, such as 48 and 60 fps.
Frame rate in electronic camera specifications may refer to the maximum possible number of frames per second, where, in practice, other settings (such as exposure time) may reduce the frequency to a lower number.
High Quality HD 1080p Video Recording
Our daVideo Rikor video camera glasses record stunning high quality video. Able to record super fast 60fps to capture extremely fast sports action. Our video sunglasses record perfect point of view POV video 1080p HD 30fps or 720p 60fps.
Video compressing format: H.264
Video Ratio Image: 16:9
Built in 12MP High Resolution Camera
With a single click of a button you can snap high resolution 12MP photos. Take a single photo at a time or you can even snap a burst of 3 or 5 photos at a time. Built in Sony sensor so you can even take great photos in low light. While you are recording video, you can even snap photos without interupting your recording.
Tough Durable Lens and Frames
Our camera sunglasses are made tough to handle the most extreme sports. Our glasses are ANSI Z87.1 certified which means we meet and exceed to standards of impact and heat resistance. Made of Grilamid TR90 material, so they are comfortable to wear while also being lightweight and flexible. 2.2mm thick lenses which are UV400 to block out 100% of all UVA, UVB, UVC and harmful blue light up to 400nm protection.
Realistic Clear True Stereo Sound
Connect Glasses to Cell Phone
You can connect the daVideo Rikor video camera glasses to your cell phone. Works on all iOS and Android devices using our free mobile app. Instantly change all your settings and recording quality with a click of a button. Update settings such as white balance, volume, exposure, saturation, resolution, photo burst, etc. You can even use your cell phone as a remote to start and stop recording on your glasses! With our mobile app you can download and share all your videos and photos with your friends through Facebook, Snapchat and Instagram.
Hands Free Vibration Alerts
Many athletes over the years have told us they want DVR camera glasses to be as hands free as possible. They dont want glasses that they have to take off, look to see if any lights are on or flashing, while in bright sunlight. We have listened, so now we feature hands free vibration alerts. You will feel a vibration when you start recording and when you stop recording so you never have to take your glasses off. We do have LED lights which also notify you, if you are in darker lit areas to see. With both new features built into our glasses, you will never miss any action!
110 degree wide angle lens allows you to record everything you see in your field of vision! You can even tilt the camera lens up and down to get that perfect shot.
To this day, we are the only 60fps spy camera glasses that are able to store up to 128GB memory! This means you will never have to worry about running out of space recording videos or taking too many photos. Even at extremely high 12MP resolution photos, you can fit over 30,500 photos. We also offer 16GB, 32GB, 64GB and 128GB cards depending on how much memory you need.
Our glasses are designed to handle extreme temperatures of any environment. Go skiing in extreme cold temperatures or go hiking in the hot desert. 480mAh high capacity lithium polymer battery handle extreme temperatures between -4 degrees Fahrenheit (-20 degrees Celsius) to 131 degrees Fahrenheit (55 degrees Celsius), Full battery charge takes about 1-2 hours.
Click here to see how our most advanced daVideo Rikor camera sunglasses compare with the daVideo Akia and daVideo Presta.
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