  Generating music with emotion similar to that of an input video is a very
relevant issue nowadays. Video content creators and automatic movie directors
benefit from maintaining their viewers engaged, which can be facilitated by
producing novel material eliciting stronger emotions in them. Moreover, there's
currently a demand for more empathetic computers to aid humans in applications
such as augmenting the perception ability of visually and/or hearing impaired
people. Current approaches overlook the video's emotional characteristics in
the music generation step, only consider static images instead of videos, are
unable to generate novel music, and require a high level of human effort and
skills. In this study, we propose a novel hybrid deep neural network that uses
an Adaptive Neuro-Fuzzy Inference System to predict a video's emotion from its
visual features and a deep Long Short-Term Memory Recurrent Neural Network to
generate its corresponding audio signals with similar emotional inkling. The
former is able to appropriately model emotions due to its fuzzy properties, and
the latter is able to model data with dynamic time properties well due to the
availability of the previous hidden state information. The novelty of our
proposed method lies in the extraction of visual emotional features in order to
transform them into audio signals with corresponding emotional aspects for
users. Quantitative experiments show low mean absolute errors of 0.217 and
0.255 in the Lindsey and DEAP datasets respectively, and similar global
features in the spectrograms. This indicates that our model is able to
appropriately perform domain transformation between visual and audio features.
Based on experimental results, our model can effectively generate audio that
matches the scene eliciting a similar emotion from the viewer in both datasets,
and music generated by our model is also chosen more often.
