TY - GEN
T1 - SQbSN
T2 - 2017 Intelligent Systems Conference, IntelliSys 2017
AU - Moreno-Escobar, Jesus Jaime
AU - Morales-Matamoros, Oswaldo
AU - Tejeida-Padilla, Ricardo
N1 - Publisher Copyright:
© 2017 IEEE.
PY - 2018/3/23
Y1 - 2018/3/23
N2 - In this work we present an algorithm for quantizing wavelet coefficients taking in to account to be used by any image compression system that use wavelet transformation, we particularly implemented it in JPEG2000. In the literature is well-know that any wavelet-base compression encoder considers three stages: 1) Conversion of pixel into the frequency domain in order to obtain coefficients; 2) Scalar Quantization; and 3) Coding of the wavelet quantized coefficients. By one hand is important to highlight that just Scalar Quantization stage is responsible for degraded or maintaining precision of a certain coefficient, thus if the accuracy of inverse quantized coefficient is reduced we can consider a lossy reconstruction otherwise when inverse quantized coefficient is perfectly reconstructed we consider a lossless reconstruction with Scalar Quantization equal to one. By the other hand, we modify the state-of-The-Art and classical JPEG2000 dead-zone scalar quantization modifying the process with a Statistical Normalization or better known as Z-Scores. We can define a Z-score as a expression in terms of standard deviations distributed along their mean. Thus, Z-scores can be defined as distribution with μ = 0 and σ2 = 0, in this way visual redundancies of the image are incremented, which gives as a result a lower compression rate.
AB - In this work we present an algorithm for quantizing wavelet coefficients taking in to account to be used by any image compression system that use wavelet transformation, we particularly implemented it in JPEG2000. In the literature is well-know that any wavelet-base compression encoder considers three stages: 1) Conversion of pixel into the frequency domain in order to obtain coefficients; 2) Scalar Quantization; and 3) Coding of the wavelet quantized coefficients. By one hand is important to highlight that just Scalar Quantization stage is responsible for degraded or maintaining precision of a certain coefficient, thus if the accuracy of inverse quantized coefficient is reduced we can consider a lossy reconstruction otherwise when inverse quantized coefficient is perfectly reconstructed we consider a lossless reconstruction with Scalar Quantization equal to one. By the other hand, we modify the state-of-The-Art and classical JPEG2000 dead-zone scalar quantization modifying the process with a Statistical Normalization or better known as Z-Scores. We can define a Z-score as a expression in terms of standard deviations distributed along their mean. Thus, Z-scores can be defined as distribution with μ = 0 and σ2 = 0, in this way visual redundancies of the image are incremented, which gives as a result a lower compression rate.
KW - dead-zone scalar quantization
KW - JPEG2000
KW - Statistical normalization
KW - wavelet coefficients
KW - Z-Scores
UR - http://www.scopus.com/inward/record.url?scp=85051088849&partnerID=8YFLogxK
U2 - 10.1109/IntelliSys.2017.8324353
DO - 10.1109/IntelliSys.2017.8324353
M3 - Contribución a la conferencia
AN - SCOPUS:85051088849
T3 - 2017 Intelligent Systems Conference, IntelliSys 2017
SP - 576
EP - 584
BT - 2017 Intelligent Systems Conference, IntelliSys 2017
PB - Institute of Electrical and Electronics Engineers Inc.
Y2 - 7 September 2017 through 8 September 2017
ER -