A HAAR CALCULATION SYSTEM, AN IMAGE CLASSIFICATION SYSTEM, ASSOCIATED METHODS AND ASSOCIATED COMPUTER PROGRAM PRODUCTS

摘要

A HAAR calculation system (HSYS) for calculating a HAAR feature of a predefined rectangular region (REG1 ) of an image is described. The HAAR calculation system comprises one or more memories (MEM), a plurality of compute engines (CU1, CU2, CU3, CUn), and a main processor (MCPU). Each compute engine is arranged to retrieve a block of image data (BLK(i)) corresponding to a rectangular image region (BLK(1 )...(BLK(mn+n)) from the one or more memories (MEM); calculate integral image values (IBLK(i)) for all pixels of the block of image data to obtain an integral image of the block of image data; and store the integral image (IBLK(i)) of the block in the one or more memories (MEM). The main processor (MCPU) is arranged to determine which one or more blocks of image data comprise pixels of the predefined rectangular region of the image; for each block of image data that comprise pixels of the predefined rectangular region of the image, define a respective rectangular region part (REC1, REC2, REC3, REC4, REC12, REC34) as the pixels of the block that belong to the predefined rectangular region of the image; calculate a HAAR feature of the rectangular region part (REC1, REC2, REC3, REC4, REC12, REC34) for each block of image data (IB1, IB2, IB3, IB4, IB12, IB34) that comprise pixels of the predefined rectangular region (REG1 ) of the image; and add the HAAR features of the rectangular region parts (REC1, REC2, REC3, REC4, REC12, REC34) to obtain the HAAR feature of the predefined rectangular region of the image.