Energy Efficient and Multiplierless Approximate Integer DCT Implementation for HEVC
Skandha Deepsita S., Kuchipudi Divya, Noor Mahammad Sk · 2021
Integer discrete cosine transform (DCT) is one of the popularly used mathematical operation on image/video applications. These applications has a unique property that the error presence in the output will not degrade the output visual quality. Hardware complexity integer DCT for image/video processing is very high, approximation in the hardware results reduction in area, power and delay without compromising the perceptual quality of the output image. This paper proposes an efficient technique to implement the approximate integer DCT for high efficiency video coding (HEVC). The proposed technique approximates the coefficients of the integer DCT using their structural property and hence multiplier hardware is not required for DCT. The proposed design is approximately 77% efficient in terms of power delay product compared with accurate integer DCT. The Quality of Approximate DCT on Images is estimated using Average PSNR and are found to be 32.17 and 30.13 for 512, 256 size images respectively.