This paper focuses on the implementation of a nonlinear optical correlator in a 4f configuration. The system exploits the Kerr effect, specifically four-wave mixing, to enable the correlation and convolution of multiple optical fields composed of different objects in a single clock cycle. This approach offers a simpler implementation than other correlation systems, eliminating the need for counterpropagating waves and complex phase matching conditions. It exhibits both low-intensity correlation operations and high-intensity geometric images in its image plane, requiring the use of obstruction masks for optimal contrast. Experimental results confirm the feasibility of the concept, especially for applications in matrix multiplication and instantaneous optical processing operations.