Yasuhiro Inazumi

Yasuhiro Inazumi
University of Toyama | U Toyama · Department of Intellectual Information Engineering

About

36
Publications
1,415
Reads
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255
Citations
Citations since 2016
6 Research Items
198 Citations
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2016201720182019202020212022010203040
2016201720182019202020212022010203040

Publications

Publications (36)
Article
The development of imaging technologies and display enable the performance of 4K (3840 × 2160px) and 8K (7680 × 4320px) contents. To provide attractive 4K video content, it is important to design and manage services based on users' quality of experience (QoE). To establish a “comprehensive QoE evaluation technology” previous studies have considered...
Article
Ant colony algorithm can resolve dynamic optimization problems due to its robustness and adaptation. The aim of such algorithms in dynamic environments is no longer to find an optimal solution but to trail it over time. In this paper, a clustering ant colony algorithm (KACO) with three immigrant schemes is proposed to address the dynamic location r...
Article
Autonomous driving needs to detect the road area. There are several methods for road detection. We have selected a method of using the image of a car-mounted camera. As our method, we cut out blocks from one image of a car-mounted camera and calculate color feature statistics from each of the block. We distinguish between the road and other block b...
Article
In this paper we examine the relationship between Cerebral Blood Flow and image quality using Near-Infrared Spectroscopy (NIRS). We measured data of cerebral blood flow and applied it to image quality assessment. To prove that test subjects acknowledged the quality degradation of test images, we performed subjective assessment tests through questio...
Conference Paper
Although quality of experience (QoE) is defined as a subjective end-user perception, most QoE measurements target boring content. Unsurprisingly, media creators and end-users are interested in interesting content. Therefore, QoE measurements are ineffective for interesting content. In this paper, we focus on a subjective assessment of the appeal of...
Article
The restoration of images by digital inpainting is an active field of research and such algorithms are, in fact, now widely used. Conventional methods generally apply textures that are most similar to the areas around the missing region or use a large image database. However, this produces discontinuous textures and thus unsatisfactory results. Her...
Article
As the first step in the development of new image quality assessment methods by using Facial Electromyogram, we examined whether the Facial Electromyogram changes with coded image distortion. First of all, by implementing the subjective assessment test, we examined the relationship between Facial Electromyogram and the conventional questionnaire me...
Poster
These days, we have a good chance to watch 3D movies at home or movie theater. However, there is various form of stereogram or display style, and these haven’t ever unified officially yet. In addition, there is no standardization for evaluating objective video quality of 3D movies. For constructing a better viewing environment, a suitable viewing c...
Article
These days, we have a good chance to watch 3D movies at home or movie theater. However, there is various form of stereogram or display style, and these haven’t ever unified officially yet. In addition, there is no standardization for evaluating objective video quality of 3D movies. For constructing a better viewing environment, a suitable viewing c...
Article
We previously developed a method for improving a target image quality based on web images. The target image is conventionally improved by using similar blocks for reference that are generated from web images. However, if bordering blocks have the same reference blocks, the improved image might have an unusual pattern. Therefore, we propose a method...
Article
We analyzed the individual characteristics of visual impressions such as activity (e.g., colorfulness, warmness, contrasty, and waviness), and regularity (e.g., whiteness, regularness, naturalness) depending on perceptual quality scale for JPEG coded images. The individual characteristics of visual impression were grouped into three classes on the...
Conference Paper
Colorization is the process that restores colors on a grayscale image from user-generated color-assignation information. A novel approach to image compression has recently been proposed that extracts such color assignation from an input color image (we called this inverse colorization). Previous studies on inverse colorization have represented colo...
Conference Paper
Social bookmarking has been in the spotlight recently. Social bookmarking allows users to add several keywords called tags to items they bookmarked. Many previous works on social bookmarking using actual words for tags, called folksonomy, have come out. However, essential information of tags is in the classification of items by tags. Based on this...
Article
Novel image compression approaches that use a process called colorization, which is a method for adding color to a monochrome image, has recently been proposed. Almost all the proposed methods represent color information by using a set of color points. However, in an area with flat chrominance and variant luminance, we need redundant points to corr...
Article
Introducing multi-agent (MA) technology into a SCADA (Supervisory Control and Data Acquisition) system can improve the serviceability and enhance maintenance-free operation with the inter-terminal parameter (ITP) method. In addition, the system's distributed intelligent field terminals (IFTs) use a common algorithm that is unaffected by any changes...
Article
Pay-TV, which allows viewers to select the programs they want to watch, is commonly available. A viewer wants to buy a desired program after he/she understands its content. A broadcaster wants to protect a program's content and advertize during the program. Existing pay-TV service is not able to meet both requirements. We developed a method for emb...
Article
We propose a video coding method for achieving desired subjective quality. In general, subjective video quality is most strongly affected by the section with the lowest quality. Therefore, to efficiently achieve the desired subjective quality, it is necessary to minimize the variation in subjective quality over time. This approach requires variable...
Conference Paper
Introducing the multi-agent (MA) technology into a distributed control system can improve serviceability and enhance maintenance free with inter-terminal parameter (ITP) method. In addition, the system s distributed intelligent field terminals (IFTs) use a common algorithm that is unaffected by any changes to the system specifications. As a result...
Conference Paper
Recently, an effective retrieval system for video data based on its content is required. In such system, queries are given by natural video data or drawing sketches. However, preparing natural video data and drawing sketches require high operating costs for users. Therefore, we proposed novel method that uses "Relevance Feedback(RF)" for creating q...
Article
This paper proposes an objective measurement for coded video quality based on camera work and frame quality. The same technique used in the objective measurement for coded still image is used to evaluate the frame quality. The proposed measurement also automatically detects the camera work. Experimental results showed that the estimation accuracy f...
Article
A method is studied for deriving the coefficient of correlation ρ between pixels from the DCT coefficient. The simplest way is to derive the pixel values by applying the fast inverse DCT to the DCT coefficients of interest and then to calculate ρ according to the definition in the image domain. When only the value of ρ is needed, the decoding opera...
Article
Watermarking has a trade-off relation between the number of embedded bits in a digital signature and image degradation. Therefore, we propose a watermarking method that improves the relationship between the number of embedded bits and image degradation. Experimental results show that image degradation using the proposed method is less than that wit...
Article
To show the relationship between the actual camerawork and the subjective quality of coded video, we conduct a subjective assessment test of several camerawork and filming speeds. In the case of high speed, we found that the subjective quality of coded video is more significantly reduced than the estimated subjective frame quality.
Article
The use of applications related to real-time video communications is spreading. But it is becoming difficult to secure the bandwidth, because of the increase in the number of the users as well as the bandwidth requirements of each user. In this context, a transcoder that can recode the video data to a usable bit rate for transmission is needed. In...
Conference Paper
The authors previously proposed a technique for estimating the optimal frame rate for a video scene, which maximizes the perceptual video quality for a prescribed bitrate. This paper applies the technique to an MPEG video transcoder, and proposes a transcoding algorithm based on the optimal framerate. Subjective assessment tests show that compared...
Conference Paper
Video transmission on the Internet often requires a transcoding in order for the bitrate to meet the available bandwidth. Since the bitrate of videos is determined by an amount of bits per frame(BPF) and framerate(FPS), one of or either of these should be reduced in transcoding. In addition, because there is a tradeoff between the BPF and FPS under...
Article
In this paper, we will propose a picture quality scale ( PQSvs) for video, applying the objective evaluation values of picture quality of still pictures for each frame of the monochrome video. This is an evaluation method based on the mean opinion score (MOS), which is obtained from the subjective evaluation of the picture quality when each frame o...
Conference Paper
We propose the new quality evaluation method of coded video which is considering the time transition of video quality. The evaluated quality value is computed as the weighted mean of the frame quality by using the weighted function which is derived from the short-term characteristic of human memory. In this case, the time transition of video qualit...

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Projects

Project (1)
Archived project
To clarify the subjective quality assessment for 3D CG images and videos with 8 viewpoints lenticular lens method.