Those are apparently called "speed on green" cameras. While the traffic signal is in the green (possibly yellow) phase, it is a speed camera. When the signal turns red, it's a red-light camera.
I actually don't have a problem with photo-enforcement as long as what they're enforcing makes sense. Red-light camera? Sure. Cut the length of the yellow down in order to catch more people out due to the short yellow duration to make more ticket revenue? Nope. Same with speed cameras. 40 km/h on a road directly in front of a school and perhaps 50 - 100 m either side of it and during reasonable school hours? Sure. Not on weekends or holidays when the kids aren't there, not at 2 AM when the kids aren't there, not throughout every street in an entire town because there happens to be a school *somewhere* in town that kids walk to and from.
I want to see someone invent a you-forgot-your-turn-signal camera.