Jitter Explorer

FPS: 0 Frame: 0

Normalized Jitter: 0.000 NFTV: 0.000

Angular Velocity (rad/s): FPS Divide:

Frame Number

Delay (frames)

Show Delay

This tool helps explore the perceptual threshold for detecting jitter in animated displays.

The white dot rotates smoothly in a circle at the specified angular velocity
When the frame number matches a "Frame Number" entry, the dot pauses for the specified "Delay" frames
Adjust the frame numbers and delays to find the threshold where jitter becomes noticeable
Use "Add Row" to add more jitter events
Adjust angular velocity to change rotation speed (1.0 rad/s = ~1/6 rotation per second)
Normalized Jitter is calculated as: sum(abs(frame-to-frame difference)) / sum(frametimes)
NFTV (Normalized Frame Time Variance) is calculated as: stdev(frametime) / mean(frametime)
Which statistic is a better fit for how jarring you find the experience?