Title :
Software JPEG for a 32-bit MCU with dual issue
Author :
Sakamoto, Tadashi ; Hase, Tomohiro
Author_Institution :
Syst. LSI Dev. Center, Mitsubishi Electr. Corp., Hyogo, Japan
fDate :
11/1/1998 12:00:00 AM
Abstract :
This paper describes a new software solution for DCT-based JPEG image compression using a 32-bit microcontroller unit (MCU) with parallel execution (dual issue). Taking the constraints of the MCU hardware resources into consideration, various fast algorithms for DCT are investigated. As a result, it is concluded that the optimal fast algorithm for MCUs capable of parallel execution differs from the optimal algorithm for MCUs which do not support parallel execution. Comparing the number of JPEG image compression cycles using software on MCUs with and without parallel execution capability, it is concluded that the processing speed of the latter type of MCU is approximately 30% higher than the former type. When this former processing speed is applied to a 640×480 (VGA-size) YCbCr image in 4:2:2 format, compression can be performed in about 0.15 seconds (using a 100 MHz MCU with parallel execution capability)
Keywords :
code standards; digital signal processing chips; discrete cosine transforms; image coding; microcontrollers; parallel algorithms; parallel architectures; reduced instruction set computing; telecommunication standards; transform coding; 100 MHz; 32 bit; 4:2:2 format; DCT; MCU; RISC architecture; YCbCr image; dual issue; fast algorithms; image compression; microcontroller unit; optimal fast algorithm; parallel execution; processing speed; software JPEG; standard; Digital cameras; Discrete cosine transforms; Hardware; Huffman coding; Image coding; Large scale integration; Microcontrollers; Registers; Software standards; Transform coding;
Journal_Title :
Consumer Electronics, IEEE Transactions on
