  Computational Colour Constancy (CCC) consists of estimating the colour of one
or more illuminants in a scene and using them to remove unwanted chromatic
distortions. Much research has focused on illuminant estimation for CCC on
single images, with few attempts of leveraging the temporal information
intrinsic in sequences of correlated images (e.g., the frames in a video), a
task known as Temporal Colour Constancy (TCC). The state-of-the-art for TCC is
TCCNet, a deep-learning architecture that uses a ConvLSTM for aggregating the
encodings produced by CNN submodules for each image in a sequence. We extend
this architecture with different models obtained by (i) substituting the TCCNet
submodules with C4, the state-of-the-art method for CCC targeting images; (ii)
adding a cascading strategy to perform an iterative improvement of the estimate
of the illuminant. We tested our models on the recently released TCC benchmark
and achieved results that surpass the state-of-the-art. Analyzing the impact of
the number of frames involved in illuminant estimation on performance, we show
that it is possible to reduce inference time by training the models on few
selected frames from the sequences while retaining comparable accuracy.
