[Dprglist] AI controlled camera at soccer game

[David Anderson]

Hi Karim,

Hmmm..  "quality of the image database" seems to suggest there is some 
art involved.  (I like that).

I'm still not clear as to what is meant by non-positive examples.  Does 
each image in the training set need to be marked in advance somehow as 
to it's relevance?   I don't really know how this works.

thanks!
David


On 11/2/20 7:02 PM, Karim Virani wrote:
> My AI thinks I'm a mop. COVID hair.
>
> Pretty much all visual object detection/classification neural nets 
> require a healthy number of non-positive examples. This looks like a 
> fail in exactly that - the body shape always being under the "ball" 
> should have lowered the probability if they had bald soccer players in 
> the general set. Though I guess photos of bald soccer players with 
> extremely round heads heading soccer balls could get a little fuzzy...
>
> Anyhow, in our limited experience, the quality of the image database 
> seems to matter as much or more than the classification algorithm.
>
> On Mon, Nov 2, 2020 at 6:13 PM David Anderson via DPRGlist 
> <dprglist at lists.dprg.org <mailto:dprglist at lists.dprg.org>> wrote:
>
>     As long as the players don't make the same mistake you'll probably
>     be ok...
>
>     My favorite part is when the ball gets kicked straight toward the
>     lineman.  The camera moves very quickly and smoothly to track the
>     path but ends up locked on the lineman's head when a player
>     intercepts the ball.
>
>     So for those of you more familiar with neural nets, is there a way
>     to train it up on what not to recognize? Sort of an inverse
>     training?  Say, if the soccer ball is attached to a neck and
>     shoulders, it's probablhy not a soccer ball?   Can you show it a
>     bunch of pictures of things that are _not_ soccer balls to improve
>     it's recognition?
>
>     cheers,
>     David
>
>
>
>     On 11/2/20 5:38 PM, Doug Paradis wrote:
>>     Same thing happens to me when I play lineman.
>>
>>     On Mon, Nov 2, 2020 at 1:32 PM David Anderson via DPRGlist
>>     <dprglist at lists.dprg.org <mailto:dprglist at lists.dprg.org>> wrote:
>>
>>         Evidently using an AI controlled camera that's supposed to
>>         follow the
>>         ball but gets confused by the lineman's bald head.
>>
>>         https://www.youtube.com/watch?v=9zoJP2FkpgU
>>
>>         In fairness, in that lighting, his head does look a lot like
>>         the ball.
>>
>>         cheers!
>>
>>         dpa
>>
>>
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