| RHo | |
| Oct 23 2016, 5:06 PM |
| F4649790: screenshot-2016-10-24-11-04-11-474266934.png | |
| Oct 24 2016, 5:05 PM |
| F4646615: Mobile web - lead image expected.png | |
| Oct 23 2016, 5:06 PM |
| F4646626: Simulator Screen Shot Oct 23, 2016, 7.06.07 PM.png | |
| Oct 23 2016, 5:06 PM |
| F4646614: Screenshot_20161023-095449.png | |
| Oct 23 2016, 5:06 PM |
| F4646629: Simulator Screen Shot Oct 23, 2016, 7.06.17 PM.png | |
| Oct 23 2016, 5:06 PM |
Occurring on
Wikipedia 5.3.0 (959)
iPhone 6S Plus (v10.0.2)
Steps to reproduce
Expected
Face detection moves the image to crop on the face of the person in the lead image. This can be seen occurring correctly on the
Android app feed  | Mobile Web article (beta features turned on)  |
Actual
iOS does not apply the face detection on the feed or even in the article
Feed  | Article  |
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Declined | None | T148926 [BUG] Face detection failing in many articles on iOS app (works on same articles in Android and mobile web) | |||
| Declined | None | T126816 Face detection failing on featured article for Feb 11 "Josiah Willard Gibbs" on feed but works fine if saved and viewed from saved pages |
This is probably a tradeoff between process time/cycles and accuracy.
I'd love to see us store this centering on the backend... sigh.
@RHo @JMinor even with changing the preset from "low" (faster, less accurate face detection) to "high" (slower, more accurate), the face is still not picked up by iOS. The issue with this particular one has to do with iOS's face detection and not much we can do outside of computing & storing on the backend.
I don't think we're perfectly consistent everywhere but here's the same page in Androidland:
@Niedzielski – so weird, the screenshot I took on Android yday in the feed showed her face :/
The only predicable part seems to be that this face detection thing works erratically.
I tested tons of pages back in the day and found that defaulting to about 1/4 down from the top seemed to produce the best results on average.
This is, of course, anecdotal, but at the time one way I tested this was to turn off face detection, choose an option (top, 1/4 down, center, 3/4 down, bottom) then I would start with Obama and keep clicking through all the previous presidents until I got to Washington keeping track of how many images looked ok.
Face recognition is non-deterministic. We've made better fallbacks in the 5.4 release, but gonna decline this for now.
I look forward to the magic day when there is editorial control for these things...