The original speed camera locations had a place for the owner to identify the driver and mail it back in. A new citation would then be issued to the identified driver.
Most of the time.
If it identified a driver but with an address outside of the country, the ticket was dismissed.
If it was a rental car company, the ticket would be dismissed because they could never identify the driver. Eventually, we got a mailing address for the proper offices at the rental car companies that could identify the drivers.
In some cases, there was a time limit specified in the contract that the final citation had to be issued by. If the owner waited as long as possible to identify the driver in those jurisdictions, we couldn't issue a new citation before the time limit and so those were dismissed.
This was about 1990 or so. I don't know how such situations are handled now.
As far as the pictures, back then the pictures were often pretty bad. But there was a bit of psychology. The driver would go to the court to see the picture. In nearly every case, they would admit that was their picture even when we couldn't see the likeness at all. So they paid the citation.
One thing I learned back then was to always ask for defense driving. Sure, you are only entitled to on defensive driving class to dismiss a ticket every so often, but if you ask for it and the judge says yes, you can take it again. I knew one guy who was a pretty bad speeder. Even though he had had a speeding ticket dismissed by taking defense driving a month before, he asked for it for a speeding ticket in Bellaire, Texas and the judge there let him take it again. It probably helped in his case in that when he went to the court in Bellaire, Texas, he was represented by lawyer.