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, but you also 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 a shutter speed configuration problem, not a frame rate one. 1/1000 and 1/2000 second shutter speeds significantly reduces blur, but it was still noticeable around the dealer's fingers and edges of the cards when looking at the recordings frame-by-frame.
The image below compares the motion blur in the dealer's hand and card, with the 2 card much more legible in the fast shutter speed example.ġ/4000s shutter speed completely eliminated all traces of motion blur. The camera's automatic shutter speed control does.ĭealing cards Ace through 5 again, we raised the camera's minimum shutter speed to 1/4000 of a second. However, in the 1 FPS example, we see only the cards appearing on the table, not the motions of the dealer, as frame rate is too low.įrame rate does not cause blurring. In the 30 and 10 FPS examples, we can see each card as it is removed from the top of the deck and placed on the table.
#Megapixel resolution calculator series
In this test, our subject dealt a series of playing cards from ace to five with the camera set to default shutter speed (1/30). Finally, at 30 FPS, you may get one or two more, but it is not much of an improvement. Notice, at 1 FPS, only 1-2 clear head shots are captured, but at 10 FPS, you get many more. In this demonstration, we had the subject shake their head back and forth walking down a hallway to show the impact of different frame rates. Trying to get a clear face shot can be difficult when people move because they naturally shift their head frequently. In the 1 FPS example, only one frame of the subject is captured, with him clearing the rest of the FOV between frames, with only his back foot visible in the second frame. However, in the 1 FPS example, the subject clears nearly the entire field of view between frames, with only part of his body visible as he enters on the left and his back foot visible as he exits. While in the 10 FPS stream, he has traveled ~2-3' between frames. With our subject sprinting through the FOV, the 30 FPS stream still catches him mid stride: However, in the 1 FPS example, he has progressed ~4' between frames, which falls in line with our measured walking speed of ~4' per second. In the 10 FPS stream, he has moved a few more inches, but still is captured in the same stride.
#Megapixel resolution calculator full
In the 30 FPS stream, he does not complete a full stride, moving only a few inches between frames. We need to keep this in mind when evaluating frame rate selection.Īs our subject walks through the FOV, we view how far he moves from one frame to the next. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.įor example, if you only have 1 frame per second, a person can easily move 4 to 16 feet in that time frame. You know the 'speed' with the frame rate (1 frame per second, 10 frames per second, 30, etc.), but how many frames do you need for reliable capture?Ī person walking at a leisurely pace covers ~4 feet per second, walking accross this 20' wide FoV in ~5 seconds:įor a person running, our subject goes through the 20' FOV in ~1.5 seconds, meaning he covers ~16' in just one second: The faster an object moves, the more likely you are to miss an action. Average Frame Rates used: What is the industry average?Īs a precursor, you need to know the speed of objects, most typically people.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 cards being dealt 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.
Choosing the right frame rate for your application is important but understanding when you should use 10 or 15 or 20 or 30 or even 60 frames per second can be unclear.
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