Some manufacturers fake frames with slow shutter, simply copying the same frame over and over again. Since this only happens 4 times, you can only have 4 frames in that second. If you have a 1/4s shutter, the shutter / exposure only opens and closes 4 times per second (i.e., 1/4s + 1/4s + 1/4s + 1/4s = 1s). Key lesson: The frame rate per second can never be higher than the number of exposures per second. Not only does this cause blurring of moving objects, you lose frames. On the other side, sometimes users want or camera manufacturers default their maximum shutter to a rate slower than the frame rate (e.g., a 1/4s shutter for a 1/30s camera). If you have blurring, you have shutter speed configuration problem, not a frame rate one. 1/1000 and 1/2000 of a second shutter speeds significantly reduces blur, but it was still noticeable around the dealers fingers and edges of the cards when looking at the recordings frame-by-frame. However, in the 1fps example, he has progressed ~4′ between frames, which falls in line with our measured walking speed of ~4′ a second.ġ/4000s shutter speed completely eliminated all traces of motion blur. In 30 and 10 fps streams, he does not complete a full stride. Average Frame Rates used: What is the industry average?Īs our subject walks through the FOV, we view how far he moves from one frame to the next.Bandwidth vs Frame Rate: How much does bandwidth rise with increases in frame rate?.Shutter speed vs Frame Rate: How are these two related?.Playing Cards: What do you miss capturing card dealing at 1, 10 and 30fps.Head Turning: How many more clear head shots do you get of a person at 1, 10 and 30fps.Running: What do you have capturing a person running at 1, 10 and 30fps.Walking: What risks do you have capturing a person walking at 1, 10 and 30fps.What speed do people move at and how does that compare to frame rates.We need to keep this in mind when evaluating frame rate selection. For example, if you only have 1 frame per second, a person can easily move 4 to 16 feet in that time frame.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |