In digital archive, it would tend to be focused on collection, share and utilization, this paper will re-consider that with viewpoint of conservation such as management and preservation permanently. At viewpoint of conservation, it contains some keywords such as conservation media, migration, file format and meta data, in addition to elements for selecting those and timing for introduction.

As information technology has progressed recently, the amount of contents can be used increase. And, there is an environment in which lots of contents can be accessed at anytime and anywhere. In this situation, it is needed to manage contents by using metadata. In this paper, we summarize the current state of metadata technology, especially museum objects, publications, and web contents area.

Huge amount of photos and videos related to the Great East Japan Earthquake has been recorded in digital form by victims themselves and mass media, national and local governments. In order to pass on lessons learned from this disaster, digital archives are essential as a cultural heritage. This paper describes the strategies and methods for digital archives on disaster with introducing the case of the project called "Marugoto311".

The National Film Center is currently running the National Research Project for the Sustainability of Born-digital Cinema subsidized by the Agency for Cultural Affairs’ Program to Assist Promotion of Priority Areas in Art and History Museums. The research project addresses several archival issues emerging from the recent rapid transition from analog to digital in film production and distribution. The digital shift within the film industry has opened up creative possibilities and distribution options, but also entails preservation issues, such as medium and format obsolescence. This article focuses on one of the research topics in the project, the long-term preservation of 4K born-digital elements, and it examines the problems that have arisen in the production process. Subsequently, it discusses the need to avoid proprietary systems and sole dependencies when developing a digital preservation program, in relation to both technology and staff expertise.

We, Historiographical Institute of the University of Tokyo, has been conducting the project for four years in which a large number of photographic dry plates were digitized and treated for preservation. In this report, we present the outline of the project and also introduce the concept of the new database system applied to store data and images on the various historical records.

A series of the glass negative recording Wall Paintings in golden hall of Horyu-ji Temple in 1935 are almost only cultural resources to know the original condition before its burn out in 1949. Details about its shooting and preservation, and how they have been handed down are described. And how should we preserve them for use and application is also described.

We proposed and developed cosmic-ray radiography with nuclear emulsion for probing the inner-structure of the reactor of Fukushima Daiichi Nuclear Power Plant, which was damaged by the Great East Japan Earthquake and Tsunami on 11 March 2011. We have conducted the demonstration to take the cosmic-ray image of the reactor core at the experimental fast reactor Joyo in 2011. In addition, we have conducted the measurement of unit 2 reactor of Fukushima Daiichi Nuclear Power Plant in 2014 and 2015. In this paper, the technical development and the current status are described.

We are developing the cosmic-ray radiography, which is a non-destructive inspection technique for large-scale structures, with nuclear emulsion. In this paper, an overview, latest research developments and future prospects are described.

Because of the expansion and growth of applications of nuclear emulsion plate, it has become much important to analyze more quickly and larger area of nuclear emulsion. We have developed a high speed nuclear emulsion plate read-out system with an ultra-wide field of view optics, the area of which is 625 times larger than previous system. In order to cover such large FOV, we have applied a mosaic imager, which consists of 72 CMOS image sensors, and 72 GPUs for three-dimensional image processing. This system gives a significant improvement of readout throughput increase two orders of magnitude than previous system.

Nuclear-sensitive emulsions have been designed by using sensitivity as a parameter of signal which is defined by a number of developed grains constituting a track of the minimum ionizing particle and fog as a parameter of noise which is defined by a number of fogged grains per volume. However it would be more purposive to use the emulsion which is designed to record a track of the ionizing radiation of research target effectively and to minimize the assumed noise in the experiment. In recent years, since the experimental equipment is installed in Nagoya University, it has become possible to prepare the suits emulsions for experimental purposes. In this report, author would review knowledges related to the design of nuclear-sensitive emulsion.

Image-formation process of the silver-salt photographic system used for nuclear-emulsion plates was described. Sensitivity theory and sensitization techniques of these materials were also explained. Differences between the action of light and radiation to the processes were included in there.

Astronomical Imaging had been a difficult field except for a small part of enthusiast. But because of the recent advance of digital imaging technology, it has changed to an easy field even for general photographers. However, from specific reason of object, astrophotography has some difficulties in imaging, processing and display which are different from general photography.
This article aims to review a recent trend of astronomical imaging and the impact brought by the advance of the digital cameras and the image processing technology, based on my lecture of “1^st seminar of Astronomical Imaging Tech nology (Sep. 17^th 2015)”.

In situ visualization by the instant photograph was the challenge of Polaroid Corporation’s second founding. The challenge close to perfection with an exception of the camera size by the release of mono-sheet type color SX-70 in 1972. However, due to the retirement of founder of Land, Polaroid products had been changed to low-cost version for popularization. Then an instant photography began to lose its luster. In contrast, the conventional photography of a competitor went increased its appeal, by small automatic cameras, high-sensitivity color films and the short time finish at minilab. On the other hand, the electronic camera which had been stagnant since the announcement of Mavica in 1981 was accepted as a consumer product with the advent of the Casio’s QV-10 in 1995. And Land’s dream was realized by the digital camera with an LCD display.