تجزیه و تحلیل عملکرد سیستم های تصویر برداری انتگرال سه بعدی بر اساس بینایی انسان

In order to improve the assessment accuracy in three-dimensional integral imaging (3DII) in terms of avoiding misjudgments and facilitating choice-making, we propose a method to analyze performance of the 3DII systems based on human visual characters. The contrastive parameters are defined by calculating ratios of resolution and depth of the optical systems to those of the human vision respectively, which can present distinguishable visual difference between the 3DII systems with equivalent optical performance. Our analysis results indicate that the size of the lens array is closely related to the contrastive parameter of resolution. Furthermore, we also carry out experiments to verify consistency and reliability of the results for two different sets of 3DII systems as proposed in the study.

Three-dimensional display is classified into two types: stereoscopic and autostereoscopic 3D display [1]. Compared with the stereoscopic 3D display that special glasses required, the autostereoscopic technique is for naked eye 3D display without visual fatigue or headache, which is also called true 3D display. As one of the promising state-of-the-art 3D display technologies, integral imaging (II) could provide many practical advantages: full parallax and continuous viewing points; no coherent or special illumination required; compact system configuration and simple implementation [2] and [3]. These unique advantages of integral imaging technology attract great attentions in the past decades. For the purpose of improving resolutions [4] and [5] and depth of field [6] and [7] of the 3DII display, many ways and methods were proposed. However, compared with great improvement of image quality, there is no specific standard or assessment for the 3DII technology up to date, resulting in difficulties in evaluation and choice-making. Though some methods were reported to evaluate 3D image reconstructed by 3DII systems, such as Mean Square Error (MSE) [8], Mean Structural Similarity Index (MSSIM) [9] and [10] and the Peak-Signal to Noise Ratio (PSNR) [11], they only focus on the performance of optical systems, which may be different from the real visual performance. In this case, people have to face the situation sometimes that there is no obvious difference in the resolution or depth of two 3DII systems, according to the parameters of optical systems, while the differences in practical visual performance are great. Such a problem may lead to misjudgments, which are made by considering optical system parameters only. Since human eyes are the real final detectors of the three-dimensional images, performance analysis of 3DII systems based on human visual characters is crucial to establish an effective and objective standard or assessment for different applications, which is needed urgently by the researchers and industry. Unfortunately, this problem received little attention in literature in the past years. In this paper, we propose a method to analyze the performance of different three-dimensional integral imaging systems based on human visual characters. By comparing the resolution and depth of three dimensional integral images with those of human eyes, noticeable differences of two 3DII systems are distinguished. Experimental results verify the efficiency and the feasibility of this analysis method.

In this paper, we propose a method to analyze the performance of different 3DII systems based on human vision. By calculating the ratio of the resolution and depth of the optical systems to those of the human vision, the contrastive parameters are defined. Further analysis indicates that the size of the lens array is closely related to the contrastive parameter of resolution, and increasing the size of the lens array is an effective way is to improve the visual resolution effect of 3DII image. The effectiveness and the reliability of the method are verified by the experiments, which are consistent with the calculation results. This method can present distinguishable difference between 3DII systems with equivalent optical performance. It might be useful to provide more intuitional evidences for system comparison, evaluation and choice-making.