Artificial Intelligence Machine Learning technique is widely used to process infrastructure image. It has been proven to be effective and efficient. A typical machine learning algorithm is referred to as the Convolutional Neural Network $($CNN$).$ You are given an image matrix information in the following $44$ matrix. Divide the matrix into four equal blocks, i$.$e$.,$ four $22$ small matrixes. Then, use "maximum pooling" algorithm to obtain a new $2\backslash$times $2$ matrix.

$\backslash$table$[[12,20,30,0],[8,12,2,0],[11,6,1,2],[15,9,0,3]]$