An image processing device and a method performed by the device are provided. The image processing device includes processors forming a partitioning unit, processors forming a partitioning unit, and memories shared by the partitioning unit and the classification unit. The partitioning unit obtains an image from a first memory, partitions the image into one or more areas, each area includes one or more objects to be classified, and saves information of the partitioning of the image in a second memory. The classification unit obtains the image from the first memory, obtains information of partitioning of the image from the second memory and classifies the objects in each area of the image to obtain a classification result of the image. The image processing device may further include a scheduling unit for controlling optimizing performance of the partitioning unit and the classification unit.