TY - GEN
T1 - χsET
T2 - 2014 International Conference on Image Processing, Computer Vision, and Pattern Recognition, IPCV 2014, at WORLDCOMP 2014
AU - Moreno, Jaime
AU - Morales, Oswaldo
AU - Tejeida, Ricardo
N1 - Publisher Copyright:
© 2014 CSREA Press.
PY - 2014
Y1 - 2014
N2 - Noise is fatal to image compression performance because it can be both annoying for the observer and consumes excessive bandwidth when the imagery is trans- mitted [1], [2]. Some noise, in addition to some numerical redundancy, is removed during the quantization process, but in some circumstances the removed information is easily perceived by the observer, leading to annoying visual arti- facts. Perceptual quantization reduces unperceivable details and thus improve both visual impression and transmission properties. In this work, we apply perceptual criteria in order to define a perceptual forward and inverse quantizer. It is based on the CBPF, a low-level computational model that reproduces color perception in the Human Visual System. Our approach consists in performing a local quantization of wavelet transform coefficients using some of the human visual system behavior properties. It is performed applying a local weight for every coefficient. The CBPF allows to recover these weights from the quantized data, which avoids the storing and transmission of these weights. We apply this perceptual quantizer to the Hi-SET coder. The comparison between JPEG2000 coder and the combination of Hi-SET with the proposed perceptual quantizer (χSET) is shown. The latter produces images with lower PSNR than the former, but they have the same or even better visual quality when measured with well-known image quality metrics such as MSSIM, UQI or VIF, for instance. Hence, χSET obtain more compressed (i.e. lower bit-rate) images at the same perceptual image quality than JPEG2000.
AB - Noise is fatal to image compression performance because it can be both annoying for the observer and consumes excessive bandwidth when the imagery is trans- mitted [1], [2]. Some noise, in addition to some numerical redundancy, is removed during the quantization process, but in some circumstances the removed information is easily perceived by the observer, leading to annoying visual arti- facts. Perceptual quantization reduces unperceivable details and thus improve both visual impression and transmission properties. In this work, we apply perceptual criteria in order to define a perceptual forward and inverse quantizer. It is based on the CBPF, a low-level computational model that reproduces color perception in the Human Visual System. Our approach consists in performing a local quantization of wavelet transform coefficients using some of the human visual system behavior properties. It is performed applying a local weight for every coefficient. The CBPF allows to recover these weights from the quantized data, which avoids the storing and transmission of these weights. We apply this perceptual quantizer to the Hi-SET coder. The comparison between JPEG2000 coder and the combination of Hi-SET with the proposed perceptual quantizer (χSET) is shown. The latter produces images with lower PSNR than the former, but they have the same or even better visual quality when measured with well-known image quality metrics such as MSSIM, UQI or VIF, for instance. Hence, χSET obtain more compressed (i.e. lower bit-rate) images at the same perceptual image quality than JPEG2000.
KW - Contrast Sensitivity Function
KW - Hu-man Visual System
KW - JPEG2000
KW - No-Reference Image Quality Assessment
KW - Peak Signal-to-Noise Ratio
KW - Perceived Images
KW - Wavelet Transform
UR - http://www.scopus.com/inward/record.url?scp=85072838159&partnerID=8YFLogxK
M3 - Contribución a la conferencia
AN - SCOPUS:85072838159
T3 - Proceedings of the 2014 International Conference on Image Processing, Computer Vision, and Pattern Recognition, IPCV 2014
SP - 244
EP - 249
BT - Proceedings of the 2014 International Conference on Image Processing, Computer Vision, and Pattern Recognition, IPCV 2014
A2 - Arabnia, Hamid R.
A2 - Deligiannidis, Leonidas
A2 - Lu, Joan
A2 - Tinetti, Fernando G.
A2 - You, Jane
A2 - Jandieri, George
A2 - Schaefer, Gerald
A2 - Solo, Ashu M. G.
PB - CSREA Press
Y2 - 21 July 2014 through 24 July 2014
ER -