  In our previous work on broadband photometric reverberation mapping (PRM), we
proposed the ICCF-Cut process to obtain the time lags of H$\alpha$ emission
line from two broadband lightcurves via subtracting the continuum emission from
the line band. Extending the work, we enlarge our sample to the Zwicky
Transient Facility (ZTF) database. We adopt two criteria to select 123 type 1
AGNs with sufficient variability and smooth lightcurves from 3537 AGNs at
$z<0.09$ with more than 100 epoch observations in the $g$ and $r$ bands from
the ZTF database. We calculate the H$\alpha$ time lags for 23 of them which
have previous spectroscopic reverberation mapping (SRM) results using ICCF-Cut,
JAVELIN and $\chi ^2$ methods. Our obtained H$\alpha$ time lags are slightly
larger than the H$\beta$ time lags, which is consistent with the previous SRM
results and the theoretical model of the AGN broad line region. The comparisons
between SRM and PRM lag distributions and between the subtracted emission line
lightcurves indicate that after selecting AGNs with the two criteria, combining
the ICCF-Cut, JAVELIN and $\chi^2$ methods provides an efficient way to get the
reliable H$\alpha$ lags from the broadband PRM. Such techniques can be used to
estimate the black hole masses of a large sample of AGNs in the large
multi-epoch photometric sky surveys such as the Legacy Survey of Space and Time
(LSST) and the survey from the Wide Field Survey Telescope (WFST) in the near
future.
