SIGGRAPH '93 Proceedings of the 20th annual conference on Computer graphics and interactive techniques
Improvement of low gray-level linearity using perceived luminance of human visual system in PDP-TV
IEEE Transactions on Consumer Electronics
1-billion-color TFT LCD TV with full HD format
IEEE Transactions on Consumer Electronics
Accuracy-Guaranteed Bit-Width Optimization
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
A reconfigurable stochastic architecture for highly reliable computing
Proceedings of the 19th ACM Great Lakes symposium on VLSI
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We present a flexible hardware architecture for precise gamma correction via piece-wise linear polynomial approximations. Arbitrary gamma values, input bit widths, and output bit widths are supported. The gamma correction curve is segmented via a combination of uniform segments and segments whose sizes vary by powers of two. This segmentation method minimizes the number of segments required, while providing an efficient way for indexing the polynomial coefficients. The outputs are guaranteed to be accurate to one unit in the last place through an analytical bit-width analysis methodology. Hardware realizations of various gamma correction designs are demonstrated on a Xilinx Virtex-4 field-programmable gate array (FPGA). A pipefined 12-bit input/8-bit output design on an XC4VLX100-12 FPGA occupies 146 slices and one digital signal processing slice. It is capable of performing 378 million gamma correction operations per second.