For testers/reviewers wanting to interpret imperfect pursuit-camera photos more closely, here's a new infographic:
Granted, there can be a lot of variances and asymmetry (e.g. speed changes that makes motion blurring very uneven, etc) but this is an excellent general rule of thumb to judge if your pursuit camera photos are good enough (for your accuracy target), or that you need to keep trying.
Generally, the momentum of a heavy camera will almost always not show meaningfully visible speed changes (within one exposure) when coasting mid-pursuit, so you'll usually get consistent leading/trailing motion blur error margin instead of asymmetric motion blurring due to acceleration/deceleration effects.
Occasional single-pixel color distortions (green, purple), like seen in this above photo, are caused by LCD inversion algorithms
-- on certain 120Hz monitors you will see green/purple discoloration effects of certain moving single-pixel checkerboard test patterns. In general, just ignore these minor discolorations; they don't affect motion blur (albiet may sometimes slightly tint the color of motion blur).
That said, this infographic highlights the minimum extra
motion blurring that gets added to imperfect pursuit photographs. Other error factors (camera focus, blurring by compression codecs, etc) are not included but are usually much smaller than this easily-measurable error margins.