scholarly journals OCCHIO E VISIONE: MERAVIGLIA DELLA NATURA O PROGETTO DIFETTOSO?

2020 ◽  
Author(s):  
Pier Giorgio Gobbi
Keyword(s):  
Visual System ◽  
Physical Model ◽  
Temporal Resolution ◽  
Human Visual System ◽  
Dynamic Range ◽  
Evolutionary Design ◽  
Human Eye ◽  
Quantitative Estimates ◽  
Chromatic Aberrations

The behavior of the human visual system exhibits some flaws, including monochromatic and chromatic aberrations, finite dynamic range, limited spatial and temporal resolution. Why did it evolve this way? Can it be improved somehow, for example with the support of technology? The answer is obtained from a neuro-physical model developed by the author, which provides quantitative estimates of the optical and visual performances of the human eye, in agreement with experimental records. The conclusion, based on the principle of utility, is that the evolutionary design of the visual system is perfectly tailored for the primary survival needs of our primitive ancestors in daylight illumination, and it can hardly be improved with the help of human technology.

Human Visual System-Based Saliency Detection for High Dynamic Range Content

2016 ◽  
Vol 18 (4) ◽  
pp. 549-562 ◽  
Author(s):  
Yuanyuan Dong ◽  
Mahsa T. Pourazad ◽  
Panos Nasiopoulos
Keyword(s):  
Visual System ◽  
Human Visual System ◽  
Dynamic Range ◽  
Saliency Detection ◽  
High Dynamic Range ◽  
High Dynamic

scholarly journals Human visual system inspired saliency guided edge preserving tone-mapping for high dynamic range imaging

2021 ◽  
Author(s):  
Nipu Rani Barai
Keyword(s):  
Visual System ◽  
Human Visual System ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Guided Filter ◽  
Tone Mapping ◽  
High Dynamic Range Imaging ◽  
Range Imaging ◽  
Edge Preserving ◽  
High Dynamic

With the growing popularity of High Dynamic Range Imaging (HDRI), the necessity for advanced tone-mapping techniques has greatly increased. In this thesis, I propose a novel saliency guided edge-preserving tone-mapping method that uses saliency region information of an HDR image as input to a guided filter for base and detail image layer separation. Both high resolution and low resolution saliency maps were used for the performance evaluation of the proposed method. After detail layer enhancement and base layer compression with constant weights, a new edge preserved tone-mapped image was composed by adding the layers back together with saturation and exposure adjustments. The filter operation is faster due to the use of the guided filter, which has O(N) time operation with N number of pixels. Both objective and subjective quality assessment results demonstrated that the proposed method has higher edge and naturalness preserving capability, which is homologous to the Human Visual System (HVS), as compared to other state-of-the-art tone-mapping approaches.

The Physics of Vision

2014 ◽  
Vol 09 (02) ◽  
pp. 135-158
Author(s):  
David R. Miller
Keyword(s):  
Visual System ◽  
Human Visual System ◽  
Particle Properties ◽  
Human Eye ◽  
The Brain ◽  
Wave Properties

The perception of an image in one's mind filled with vibrant colors comes so naturally for humans that the complexity of the human visual system is often overlooked. This paper follows the journey of light through the human eye and its interpretation in the brain. The wave properties of light are explored as light propagates through the eye while the particle properties of light are examined when light is absorbed by the retina. The computations involved in the perception of color are discussed as well as birefringent properties of the eye.

scholarly journals Protuberancy State Recognition in Human Visual System

2020 ◽  
pp. 423-425
Author(s):  
Bharath V ◽  
Jeba N ◽  
Priyadharshini P ◽  
Gurur raja
Keyword(s):  
Visual System ◽  
Human Visual System ◽  
Dynamic Range ◽  
Visual Saliency ◽  
High Dynamic Range ◽  
Image Features ◽  
State Recognition ◽  
Quantitative Metrics ◽  
Proposed Model ◽  
Essential Region

The human visual system (HVS) seeks toward select relevant region in the direction of level rear method attempts. visual concentration effort to guess the essential region of films or imagery observed through an individual eye. Such representations, are functioned to areas similar to workstation work, MPEG conventions, and an eminence evaluation. while numerous models are expected, only some of them be pertinent enroute for high dynamic range (HDR) picture substance, in addition to no effort has been completed for HDR visualization. Furthermore, the disadvantage inside the obtainable form is with the intention, they couldn't reproduce the uniqueness of HVS beneath the extensive shining array established in HDR substance. This paper gets the better of these troubles by the process approach to represent the bottom-up visual saliency for HDR input through merge spatial and temporal image features. An examine of a human eye ball movement information make sure the efficiency of the proposed model. Evaluation using 3 well-known quantitative metrics show that the proposed model significantly gets better predictions of visual concentration for HDR substance.

scholarly journals Human visual system inspired saliency guided edge preserving tone-mapping for high dynamic range imaging

2021 ◽  
Author(s):  
Nipu Rani Barai
Keyword(s):  
Visual System ◽  
Human Visual System ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Guided Filter ◽  
Tone Mapping ◽  
High Dynamic Range Imaging ◽  
Range Imaging ◽  
Edge Preserving ◽  
High Dynamic

With the growing popularity of High Dynamic Range Imaging (HDRI), the necessity for advanced tone-mapping techniques has greatly increased. In this thesis, I propose a novel saliency guided edge-preserving tone-mapping method that uses saliency region information of an HDR image as input to a guided filter for base and detail image layer separation. Both high resolution and low resolution saliency maps were used for the performance evaluation of the proposed method. After detail layer enhancement and base layer compression with constant weights, a new edge preserved tone-mapped image was composed by adding the layers back together with saturation and exposure adjustments. The filter operation is faster due to the use of the guided filter, which has O(N) time operation with N number of pixels. Both objective and subjective quality assessment results demonstrated that the proposed method has higher edge and naturalness preserving capability, which is homologous to the Human Visual System (HVS), as compared to other state-of-the-art tone-mapping approaches.

Sign in / Sign up

Export Citation Format

Share Document