Cross-Database Micro-Expression Recognition Exploiting Intradomain Structure

Table 1

Notations and corresponding descriptions.

Notations	Descriptions
	Coefficient matrix
	The dimension of the feature vector
	The trade-off parameter to balance objective function
	The trade-off parameter to control the sparsity of the coefficient matrix
	The feature matrix of source domain micro‐expression samples
	The feature matrix of target domain micro‐expression samples
	The number of source domain samples
	The number of target domain samples
	The whitened source domain features
	Regenerated source domain micro‐expression samples features
	Regenerated target domain micro‐expression samples features
	Probability annotation matrix
	The class of the label
	The center of class