Intra Frame Flicker Reduction for Parallelized HEVC Encoding

An efficient post-processing adaptive filtering technique to rectifying the flickering effects

“…At the same time, researchers used a fixed threshold approach in their work [8]. None of the researchers introduce the concept of reduction of PSNR loss while designing flicker artifact detection and removal techniques.…”

“…Due to a one-dimensional filtering approach, the in-loop processing method enhances the coding efficiency by reducing blocking artifacts amongst adjoining pixels or frames but is unable to process corner outliers. To alleviate blocking artifacts different post-processing approaches such as frequency domain analysis , Projection Onto Convex Sets (POCS) [9][10][11][12][13], waveletbased techniques [8,[20][21][22][23][24][25][26][27][28][29][30], estimation theory [5,[9][10][11][12][13], and filtering approach [11][12][13][14][15] has been proposed in last few decades. The most common method is to apply a low-pass filter across block boundaries to remove artifacts.…”

“…POCS is more complex and requires high computations due to more iteration steps performed during discrete cosine transform (DCT) as well as inverse discrete cosine transform (IDCT). Wen et al [8] produced a DCT based filtration method for the smooth region, but it has poor performance. Hu et al [16] proposed a singular valued decomposition (SVD) technique.…”

“…On the other hand, corner outliers, detection, and removal have been proposed by [15,25]. During compression, the corner outlier pixels are either considerable value or very small value pixels concerning surrounding pixels [8,[17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Later on, Wang J. et al [37] presented an adaptive filter-based technique for compressed images of different regions.…”