3 ms·
This is an interesting one, because they optimize for an untypical goal: "If the scale/exposure of colors are changed, the perceptual coordinates should just be
by fxtentacle 6y ago
This is an interesting one, because they optimize for an untypical goal: "If the scale/exposure of colors are changed, the perceptual coordinates should just be scaled by a factor"
For most computer vision applications, that is the opposite of what you want. When you analyze a video stream, it is quite common for frames to have different brightness due to things like aliasing between the flicker of LEDs in the room and the camera shutter. That's why CV needs a color space where colors remain close to each other, no matter the frame brightness.
- mkl 6y agoI think it means the hue stays the same, since it's angle in polar coordinates, which is scale invariant. Saturation (chroma) changes though.
- CyberDildonics 6y agoBrightness is by far the biggest factor in perceptual differences and perceptual color spaces are approximations. Also LEDs don't typically flicker unless a dimmer is on the circuit and their PCB isn't made for that. You might be thinking of florescent lights that are pulsed with a ballast.
- nitrogen 6y agoQuite a large number of LED fixtures flicker at line frequency, sadly, even in "luxury" buildings.
- CyberDildonics 6y agoYou are probably seeing early LED fixtures with terrible electronics put in luxury buildings as the hip new thing years ago. All it takes is a capacitor above 170 volts after the rectifier to smooth out the AC.