A Novel Compressive Image Encryption with an Improved 2D Coupled Map Lattice Model

Algorithm 1

The measurement matrix.

	Input: Two sets of initial conditions in the improved 2D CML model
	Output: the measurement matrix
	Function Main:
	Step 1: select PLM as the local map with, set and in the proposed 2D CML model.
	Step 2: under the parameters of step 1, set different initial values for the two improved 2D CML models, iterate the two models for 2000 times to eliminate the influence of initial value.
	Step 3: then, run the two improved 2D CML models, choose the chaotic sequences generated by the node of the 4^th row and the 4^th column for each iteration, and combine the chaotic sequences with the length.
	Step 4: for each , according to Algorithm 1, transform the chaotic sequences and form the new chaotic sequences ,
	.
	Step 5: finally, arrange the chaotic sequences by column and construct the measurement matrix as
	where is used for normalization.