1. An image processing system, comprising: one or more memories; and image processing circuitry, which, in operation: controls a search window location of a search window associated with an image frame based on a motion vector associated with a sub-region of a previously processed image frame; and controls a size and shape of the search window in response to a determined recognition rate, wherein the image processing circuitry, in operation, controls horizontal and vertical dimensions of the search window based on the motion vector associated with the sub-region of the previously processed image frame, according to: N h = K k × f ⁡ ( V h , N - 1 ) R q ; and N v = K v × f ⁡ ( V v , N - 1 ) R q , where N h is a horizontal size in pixels or sub-regions, N v is a vertical size in pixels or sub-regions, K h is a horizontal scaling constant, K v is a vertical scaling constant, f(V h, N−1 ) represents a functional dependency on a horizontal magnitude of the motion vector associated with the sub-region of the previously processed image frame, f(V v, N−1 ) represents a functional dependency on a vertical magnitude of the motion vector associated with the sub-region of the previously processed image frame, and R q represents the determined recognition rate.