著者

Hideki Kakeya Ken Okada Hayato Takahashi

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.6, no.3, pp.237-246, 2018 (Released:2018-07-01)

参考文献数

25

被引用文献数

14

---

This paper presents a full-HD autostereoscopic display with a wide viewing zone based on time-division multiplexing slanted parallax barrier with subpixel-based slit control. A slanted directional diffuser placed between the barrier panel and the image panel suppresses moir_ by mixing light from RGB subpixels. By constituting the parallax barrier along with this slanted diffusion line, control of the barrier by subpixel unit is enabled. By introducing subpixel-based phase shift and slit width control to time-division quadruplexing parallax barrier, viewing zone free from crosstalk is enlarged notably. Theoretical viewing zone is calculated and compared with the experimental results using a prototype hardware. The overall crosstalk of the prototype is also measured to confirm the effectiveness of the proposed method.

著者

Garimagai Borjigin Hideki Kakeya

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.9, no.1, pp.80-85, 2021 (Released:2021-01-01)

参考文献数

22

被引用文献数

1 5

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In this paper, we propose autostereoscopic displays with novel directional backlight designs. A high level of stereoscopic crosstalk is the main problem to be solved in the conventional systems. To reduce crosstalk, we propose a directional backlight system that suppresses the effect of field curvature only with a single layer of curved lens array. It is confirmed that the crosstalk level is reduced notably by the proposed methods. The uniformity of backlight intensity is also increased by using a lens array composed of trapezoid elemental lenses in place of rectangle elemental lenses.

著者

Yusuke Matsui Yusuke Uchida Hervé Jégou Shin'ichi Satoh

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.6, no.1, pp.2-10, 2018 (Released:2018-01-01)

参考文献数

53

被引用文献数

1 21

---

Product Quantization (PQ) search and its derivatives are popular and successful methods for large-scale approximated nearest neighbor search. In this paper, we review the fundamental algorithm of this class of algorithms and provide executable sample codes. We then provide a comprehensive survey of the recent PQ-based methods.

著者

Takefumi Hiraki Shogo Fukushima Hiroshi Watase Takeshi Naemura

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.7, no.4, pp.160-168, 2019 (Released:2019-10-01)

参考文献数

18

被引用文献数

4

---

We previously studied methods leveraging pixel-level visible light communication (PVLC) that embeds imperceptible information for human eyes in each pixel of an image. The PC computation load and amount of data transferred between the PC and projector in previous PVLC systems were excessive because the PC executed both the video and data encoding processes. As a result, it was impossible to achieve both high-dynamic-range images and dynamic updates of the images and data. In this paper, we propose a dynamic PVLC system that offers high video quality and interactively updates the PVLC information through hardware encoding processing. Our system can project a 24-bit gradation color PVLC video that contains 64-bit data at 120 fps by synchronously controlling the ON/OFF states of the DMD and LED light sources at the given performance limit of the projector.

著者

Bin Yang Hideki Kakeya

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.9, no.2, pp.136-142, 2021 (Released:2021-04-01)

参考文献数

15

被引用文献数

1

---

We propose an autostereoscopic display allowing two observers with adaptive fractional time-division multiplexing parallax barrier. Fractional time-division suppresses perceived flickers when the order of slit position is properly set. To make sure that both of the observers are located in the proper viewing zones to enable stereoscopy simultaneously, the number of time-division multiplexing is switched in accordance with the distance between them. The viewing zone without crosstalk for the second viewer is evaluated theoretically.

著者

Kenjiro Sugimoto Sei-ichiro Kamata

出版者

映像情報メディア学会

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.3, no.1, pp.12-21, 2015 (Released:2015-01-01)

参考文献数

42

被引用文献数

3 25

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This paper presents an efficient constant-time algorithm for Gaussian filtering and also Gaussian derivative filtering that provides a high approximate accuracy in a low computational complexity regardless of its filter window size. The proposed algorithm consists of two key techniques: second-order shift properties of the Discrete Cosine/Sine Transforms type-5 and dual-domain error minimization for finding optimal parameters. The former enables us to perform filtering in fewer number of arithmetic operations as compared than some state-of-the-art algorithms without integral images. The latter enables us to find the optimal filter size that provides the most accurate filter kernel approximation. Experiments show that the proposed algorithm clearly outperforms state-of-the-art ones in computational complexity, approximate accuracy, and accuracy stability.

著者

Tomoyo Kikuchi Yuchi Yahagi Shogo Fukushima Saki Sakaguchi Takeshi Naemura

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.11, no.2, pp.75-87, 2023 (Released:2023-04-01)

参考文献数

31

---

Mid-air images in a three-dimensional space beyond a screen enable users to observe virtual content without wearing any devices. When using a symmetrical mirror structure with dual slit-mirror arrays, the system enables the display of a large mid-air image by integrating multiple imaging paths. However, in the mirror design used in previous research, the luminance was discontinuous. In this study, we propose a novel tabletop system in which a tall mid-air image with continuous luminance is superimposed onto physical objects. Our proposed system, called “AIR-range”, presents mid-air images that appear seamlessly from the table surface to mid-air. By theorizing the relationship between the parameters of optical systems and luminance of mid-air images, we optimized the optical systems to minimize the difference in luminance between the imaging paths. The results of the comparison with the previous method showed an improvement in luminance continuity.

著者

Koichi Ito Takafumi Aoki

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.6, no.1, pp.64-80, 2018 (Released:2018-01-01)

参考文献数

82

被引用文献数

9

---

This paper presents recent advances in biometric recognition, where we focus on face, fingerprint and iris recognition, which are major research topics on biometric recognition. We summarize the research trend of face, fingerprint and iris recognition over the past decade. This paper also presents our activities of biometric recognition. Our approach employs the phase information obtained by Discrete Fourier Transform (DFT) of images. The phase information preserves the inherent features of the image, and its correlation function, called phase correlation or Phase-Only Correlation (POC), gives us both the good similarity measure for biometric recognition and the translational displacement for image registration. Our approach of using phase information has been successfully applied to fingerprint, face, iris, palmprint, finger knuckle and dental recognition. Among them, we present some interesting results of palmprint recognition, finger knuckle recognition and dental recognition.

著者

Naoki Wada Mikio Shinya Michio Shiraishi

出版者

映像情報メディア学会

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.1, no.4, pp.328-332, 2013 (Released:2013-10-01)

参考文献数

3

被引用文献数

14

---

Interests in food safety have been growing and identification management has been recognized very important to improve qualities and safety of foods. This paper investigates pig face recognition to enable inexpensive marker-less pig identification management systems. Eigenspace methods are known to be effective to human face recognition, and we applied them to pig face recognition. From experimental results, we found that pig eyes are the most effective face part for recognition. We obtained 97.9% recognition rate for 16 categories with 16 samples/category training data, and some potential of the method was suggested.

著者

Hironari Takehara Ze Wang Honghao Tang Noriaki Kishida Yusuke Horiki Motoshi Sobue Makito Haruta Hiroyuki Tashiro Kiyotaka Sasagawa Jun Ohta

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.10, no.2, pp.59-68, 2022 (Released:2022-04-01)

参考文献数

38

被引用文献数

1

---

This study proposes to adapt the fundus camera for use as a personal healthcare tool. The proposed system uses near-infrared light to avoid blinding the subject and three-wavelength near-infrared imaging to acquire colorized fundus images. First, the optical system with the fundus camera was tested using a three-plate near-infrared snapshot camera. Subsequently, image processing and denoising techniques, including tracking and image integration, were applied to reduce the blur caused by biological scattering. Furthermore, a singlechip three-wavelength near-infrared-compatible image sensor is required for device miniaturization, for which a dielectric multilayer Fabry-Perot bandpass filter was adopted as its transmission wavelength can be easily controlled. In this study, the optical design of the dielectric multilayer structure, the fabrication process of the mosaic filter, and the chip mounting technology are investigated. The demosaicing process and color space conversion corresponding to the spectral response characteristics of the fabricated image sensor are also discussed.

著者

Yiwei Zhang Xueting Wang Yoshiaki Sakai Toshihiko Yamasaki

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.9, no.4, pp.262-275, 2021 (Released:2021-10-01)

参考文献数

38

被引用文献数

1

---

Exploring brands that customers are likely to purchase jointly has a profound effect on marketing. This study proposes a new way to measure, or estimate the similarity between brands using social media. The proposed algorithm analyzes the daily photos and hashtags posted by each brand's followers. By clustering them and converting them into histogram-based features, we can calculate the similarity between brands. We evaluate our proposed algorithm by comparing it with the purchase logs of point/credit card companies, and answers to the questionnaires. The results show that purchase logs can predict the co-purchase behaviors in the questionnaires very well, but cannot predict customers' potential interest or willingness to buy products from new brands. On the other hand, our method can predict the users’ interest in brands with a correlation coefficient of over 0.53, which is high considering that such interest in brands is highly subjective and individual dependent.

著者

Hitoshi Nishimura Kazuyuki Tasaka Yasutomo Kawanishi Hiroshi Murase

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.8, no.4, pp.269-279, 2020 (Released:2020-10-01)

参考文献数

39

被引用文献数

3

---

In this paper, we propose a multiple human tracking method with alternately updating trajectories and mult iframe action features (MHT-MAF). Even though occlusion or motion blur occurs due to the sudden movement of the drone, ID switches are prevented by the stable MAF. In the experiments, we verified the effectiveness of the proposed method using the Okutama-Action dataset. Our code is available online (https://github.com/hitottiez/mht-paf).

著者

Satoshi Abe Takefumi Hiraki Shogo Fukushima Takeshi Naemura

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.8, no.3, pp.170-185, 2020 (Released:2020-07-01)

参考文献数

40

被引用文献数

2

---

Communication between screens and cameras has attracted attention as a ubiquitous information source, motivated by the widespread use of smartphones and the increase of public information screens. The method that encodes data into visible patterns impairs the user's visual experience. Previously, embedding matrix barcodes into images on displays by utilizing imperceptible color vibration was proposed. In this approach, the visual experience is maintained considering that barcodes are imperceptible, and it can be implemented on almost any display and camera. Herein, we describe a sophisticated modulation protocol and restoration procedure whereby device characteristics such as the display's gamma feature and the smartphone's rolling shutter are taken into consideration. Extensive experiments reveal the parameters for the modulation and that this system works under practical situations. In addition, scenarios of potential practical applications and a user study examining imperceptibility of barcodes and usability of the system are presented to illustrate the technological capabilities.

著者

Tomoki Haruyama Sho Takahashi Takahiro Ogawa Miki Haseyama

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.8, no.2, pp.89-99, 2020 (Released:2020-04-01)

参考文献数

41

---

The details of the matches of soccer can be estimated from visual and audio sequences, and they correspond to the occurrence of important scenes. Therefore, the use of these sequences is suitable for important scene detection. In this paper, a new multimodal method for important scene detection from visual and audio sequences in far-view soccer videos based on a single deep neural architecture is presented. A unique point of our method is that multiple classifiers can be realized by a single deep neural architecture that includes a Convolutional Neural Network-based feature extractor and a Support Vector Machine-based classifier. This approach provides a solution to the problem of not being able to simultaneously optimize different multiple deep neural architectures from a small amount of training data. Then we monitor confidence measures output from this architecture for the multimodal data and enable their integration to obtain the final classification result.

著者

Takahiro Miura Ken-ichiro Yabu Kenichi Tanaka Kazutaka Ueda Tohru Ifukube

出版者

映像情報メディア学会

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.5, no.1, pp.8-16, 2017 (Released:2017-01-01)

参考文献数

38

被引用文献数

1

---

Because of rapid population aging, it is necessary to design interfaces that can decrease cognitive workload. The design implications and evaluation criteria for creating such senior-friendly or disability-friendly interfaces need to be established. One element related to memory function that can be manipulated in an interface is visuospatial working memory. However, there are few reports regarding the relationship between visuospatial working memory volume and age. In this paper, we aim to clarify how visuospatial working memory volume changes across the lifespan. We implemented a gamified application named VisuoSpats, which is based on the visual pattern span test, to measure visuospatial memory. The introduced gamification elements included points, leaderboards, and feedbacks. Three hundred and sixty-nine individuals aged 2 to 92 years old participated in this study. The results indicate that the median number of cells memorized was 7.0 (interquartile range: 5.0-9.0) across all age groups. Moreover, the number of cells memorized tends to increase as age increases until the age range of 21-25 years, and then decreases gradually with increasing age. Based on the comments by teenagers or seniors, the effective gamification elements of VisuoSpats could be competition elements such as points and ranking, or diagnostic factors, respectively.

著者

Junichi Sugita Tokiichiro Takahashi

出版者

映像情報メディア学会

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.1, no.4, pp.317-327, 2013 (Released:2013-10-01)

参考文献数

22

被引用文献数

1 4

---

We propose a method for generating pointillistic style images from input image considering the features of Seurat's pointillism. Georges-Pierre Seurat is a pioneer and prime exponent of neo-impressionist. He established a technique called pointillism based on scientific color theory. There are three important features of Seurat's pointillism: optical mixture, complementary color contrast and halo effect. The most important feature is the optical mixture. To implement the optical mixture faithfully, we present a pointillistic halftoning method for color halftoning on random dots by utilizing a spatial data structure of boundary sampling algorithm. In addition, we implement complementary color contrast and halo effect according to actual Seurat's painting steps.

著者

Nobuyuki Yagi Yasuhiro Itou Shuichi Fujisawa

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.7, no.3, pp.112-117, 2019 (Released:2019-07-01)

参考文献数

11

被引用文献数

1 2

---

The distance at which TV is viewed in the home is analyzed in terms of the conditions of the surroundings. Newly developed survey method makes it possible to collect a lot of reliable data at a considerably cheaper cost and in a shorter period than in a field survey although based on a questionnaire survey. The results show that the relative viewing distance is around 5 screen heights (H), which is 1 H shorter than before. This change is primarily because the screen size of TVs at home have become bigger despite that the room area has not changed. Absolute viewing distance depends on room area, but screen size does not depend on room area so much. The viewing distance is shorter than the average if the viewer is closely focused on the TV or if interactive services are frequently used.

著者

Hiroaki Yano Tomohiro Yendo

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.11, no.2, pp.43-48, 2023 (Released:2023-04-01)

参考文献数

16

---

The multi-projection-based light-field display is a family of glasses-free three-dimensional(3-D) displays that is easy to scale up. We propose a method for creating a light-field display using a projector and kaleidoscope-like optics in this paper. Using optical simulations, we investigate how the kaleidoscope can adjust the display parameters. In addition, for a prototype system, we developed a semi-automatic calibration method. It has been established that a glasses-free 3-D display is possible with a small number of readily available parts and quite a simple structure.

著者

Takeyuki Kobayashi Ryosuke Naito Fumihiko Sakaue Jun Sato

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.2, no.2, pp.192-198, 2014 (Released:2014-04-01)

参考文献数

16

被引用文献数

1

---

Recent progress in coded imaging has enabled us to recover sharp images from undesirable image blurs caused by depth and motion. However, the existing methods are limited to single types of blurs, such as depth blur or motion blur. The coded imaging must also tackle the problem of image noise caused by decreasing of input light. In this paper, we propose a method, which enables us to deblur both depth blur and motion blur simultaneously by coding image capture both in space and time. In particular, we show that by changing the aperture pattern efficiently, accurate image deblurring can be achieved under the existence of image noise.

著者

Yuichi Mashiba Hisham E. Bilal Salih Naoto Wakatsuki Koichi Mizutani Keiichi Zempo

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.10, no.4, pp.216-224, 2022 (Released:2022-10-01)

参考文献数

43

被引用文献数

1

---

In this paper, we develop an automatic image sonification system using auditory icons and their stereophonic presentation. We evaluated the effects of scene sounds and action sounds on the understanding of the scene and the sense of presence. The results showed that the scene sounds contributed to the understanding of the scene and the sense of presence and that action sounds also improved the sense of presence. On the other hand, it was confirmed that object sounds alone can convey scene information in images and have a high index of sense of presence. Our sonification system is expected to provide not only a more immersive experience for sighted people through images but also an opportunity for people with visual impairments to share the experience through social networking services (SNSs).