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

Volume

44

Issue

4

fYear

1998

fDate

11/1/1998 12:00:00 AM

Firstpage

1334

Lastpage

1341

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;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.735835

Filename

735835