A hybrid radix-4 and approximate logarithmic multiplier for energy efficient image processing

Lotrič, Uroš (avtor), Pilipović, Ratko (avtor), Bulić, Patricio (avtor)

Multiplication is an essential image processing operation commonly implemented in hardware DSP cores. To improve DSP cores’ area, speed, or energy efficiency, we can approximate multiplication. We present an approximate multiplier that generates two partial products using hybrid radix-4 and logarithmic encoding of the input operands. It uses the exact radix-4 encoding to generate the partial product from the three most significant bits and the logarithmic approximation with mantissa trimming to approximate the partial product from the remaining least-significant bits. The proposed multiplier fills the gap between highly accurate approximate non-logarithmic multipliers with a complex design and less accurate approximate logarithmic multipliers with a more straightforward design. We evaluated the multiplier’s efficiency in terms of error, energy (power-delay-product) and area utilisation using NanGate 45 nm. The experimental results show that the proposed multiplier exhibits good area utilisation and energy consumption and behaves well in image processing applications.

• Jezik: Angleški jezik
• Ključne besede: approximate multiplier, approximate computing, arithmetic circuit design, hybrid encoding, radix-4 encoding, logarithmic encoding, energy-efficient processing
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FRI - Fakulteta za računalništvo in informatiko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2021
• Št. strani: 20 str.
• Številčenje: Vol. 10, iss. 10, art. 1175
• PID: 20.500.12556/RUL-135536
• UDK: 004
• ISSN pri članku: 2079-9292
• DOI: 10.3390/electronics10101175
• COBISS.SI-ID: 63386371
• Datum objave v RUL: 17.03.2022

Gradivo je del revije

• Naslov: Electronics
• Skrajšan naslov: Electronics
• Založnik: MDPI
• ISSN: 2079-9292
• COBISS.SI-ID: 523068953

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 14.05.2021

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: aproksimativni množilnik, aproksimativno računalništvo, načrtovanje aritmetičnih vezij, hibridno kodiranje, radix-4 kodiranje, logaritemsko kodiranje, energijsko učinkovito računanje