  We propose a monospectral image encryption method in which the multispectral
color image acquisition by using heterogeneous monospectral cameras. Because
the captured monospectral elemental images (EIs) belongs to grayscale image, it
is means that the captured EIs can be directly encrypted by the proposed
encoding method. Subsequently, the linear cellular automata (CA) and
hyperchaotic encoding algorithm are employed to encrypt the captured EIs.
Different from previous methods, the proposed method can directly encrypt the
multispectral color information rather than having to divide into three color
channels (R, G and B), thereby, the proposed method can greatly reduce the
encryption calculation.
