An image data processing method includes receiving first frame image data at a first resolution, reducing a resolution of the first frame image data to a second resolution, performing image recognition on the first frame image data under the second resolution to determine one or more regions of interest (ROI) and a priority level of each of the ROIs; and extracting portions of the second frame image data corresponding to the one or more ROIs under the first resolution, adjusting the resolution of the local image data based on the priority corresponding to each ROI; and merging the local imagedata having the adjusted resolution with image data of a second frame at a second resolution having at least one ROI, and outputting the merged image data as the image data of an output frame.