Are DVP data lines static during the 'invalid data' period between HREF pulses on OV5640?

I’m creating a 1 bit depth vision system that uses timers and interrupts to perform basic processing. This will only work well if the data lines are static between pulses. If there is random noise, the interrupts will fire when they are not supposed to.

Do the data lines keep the last value, or do they do random things?