In a recent paper we have proposed a method for inverse halftoning of monochrome images. It is a Look Up Table (LUT) based method, obtained from the histogram gathered from a few sample halftone images and corresponding original images. The method is extremely fast (no ltering is required) and the image quality achieved is comparable to the best methods known for inverse halftoning. The method ...

Introduction Altera continues to lead the FPGA industry in architectural innovation. The logic fabric and routing architecture in Altera® FPGAs are unmatched, providing customers with a number of advantages. Altera was the first to introduce the 8-input fracturable look-up table (LUT) with the Stratix® II family in 2004. At its core is the adaptive logic module (ALM) with 8 inputs, which can im...

In this paper, a new de-embedding technique with Look-Up Table (LUT) is proposed for accurate and efficient characterization of interconnects, particularly printed circuit board (PCB) transmission lines including microstrip and stripline. LUT is pre-created to cover various fixture effects including the reference structures inside and/or outside test printed circuit boards (PCBs). The pre-estab...

Color reproductions in most LCD are quite different from those of standard CRT (cathode ray tube) monitor display because of the nonlinear characteristic in subtractive color reproduction. Moreover, gray scale CCT (correlated color temperature) reproductions in a typical mobile phone LCD depend on the input RGB levels. A simple LUT (Look-up table) method for constant gray scale CCT and gamma ch...

The aim of this paper is to present an efficient implementation of unsupervised adaptive-activation function neurons dedicated to one-dimensional probability density estimation, with application to independent component analysis. The proposed implementation is a computationally light improvement to adaptive pseudo-polynomial neurons, recently presented in Fiori, S. (2000a). Blind signal process...

Data embedding mechanism used for authentication applications should be secure in order to prevent an adversary from forging the embedded data at his/her will. Meanwhile, semi-fragileness is often preferred to allow for distinguishing content changes versus non-content changes. In this paper, we focus on jointly enhancing the robustness and security of the embedding mechanism, which can be used...

New testing methods are required as the complexity of Field Programmable Gate Array (FPGA) designs grow rapidly and time-to-market demands shorten. In this paper we propose a new, physical fault injection method for the test of a system’s self-stabilizing property, that is its intrinsic ability to recover from transient faults. Therefore we inject transient faults in Look-Up Table (LUT)-based F...

This paper explores how synthesis tools such as Mentor Graphics’ Precision RTL Synthesis can infer different types of multiplexers from different styles of HDL code, and how these structures can be mapped into FPGA devices. Inefficient multiplexers can greatly increase the logic required to implement your design. This paper discusses some common pitfalls and provides design guidelines to achiev...

This paper elucidates the system construct of DA-FIR filter optimized for design distributed arithmetic (DA) finite impulse response (FIR) and is based on architecture with tightly coupled co-processor data processing units. With a series look-up-table (LUT) accesses in order to emulate multiply accumulate operations constructed DA FIR implemented FPGA. The very high speed integrated circuit ha...

Halftoning is the rendition of continuous-tone pictures on displays, paper or other media that are capable of producing only two levels. In digital halftoning, we perform the gray scale to bilevel conversion digitally using software or hardware. In the last 3 decades, several algorithms have evolved for halftoning. Examples of algorithms include ordered dither, error diffusion, blue noise masks...