The term “Slow Motion” or “Slow motion” as used in English, refers to the reproduction of a sequence of film or video that does not correspond to the actual speed at which it was recorded, but runs much slower and allows appreciate more fully the action of the scene.
This technique is commonly used in playing sports broadcasts to analyze the characteristics of the play or in narrative sequences which seeks to increase the drama of some specific action.
What many people find hard to understand is that to achieve good slow motion (free scanning), it is necessary to record the sequence at the fastest speed possible. Playback sequence actually is normal, that is, once processed image, is reproduced at the same speed as a scene that takes place naturally, but is slower because while recording his record was made much faster.
To understand this easier first begin to understand that the speed of the video is measured in frames per second (fps) and depending on the standard being used, this speed can vary between 29.97 fps and 50 fps in the case of some systems High Definition.
In a camera that has the ability to record at 2,400 frames per second playback at 30 fps will represent only 1.25% of its normal speed and a camera recording at 4,740 frames per second under the same playback parameter used previously, will be to 0.63% of the speed at which things actually happened on the scene.
The secret of high-speed cameras, is the high sensitivity that have their photo sensors to capture light in much less time than do normal devices and about a decade ago, this hyper sensitivity meant a sacrifice in the definition of image but currently, models like the MEMRECAM HX-1, have the ability to capture 2,000 frames per second at an astonishing resolution of 2560 X 1920 pixels (almost two and half times the HD format). This same model, reduced to 320 X 24 pixels format, can record 740.660 fps.
The world in slow motion presents images of unparalleled beauty and drama that by themselves, we demonstrate how powerful and useful are the high-speed cameras for appreciation and especially for science. Remember that it was only in 1873 when the British Eadweard Muybridge under initiative of Leland Stanford (president of the Central Pacific Railway in the US), using different techniques and arrangements cameras, conducted the famous study of movement of a galloping horse where it could be seen that the animal, for the briefest interval, gets to have all four feet in the air during the race.
Just to give you an idea of the freezer to record these cameras elaborated the comparative table of actual speed against speed record that you will see at the end of the article.
I invite you to take a look at this excellent gallery with hundreds of videos recorded with a high speed camera that allow you to enjoy a very different world than daily escapes from our sight.
Comparison of actual speed and speed record