In order to preserve art works or historical documents for the purpose of appreciation, research, education, and so on, studies on digital museum is making progress in various research fields. Especially, in case of preserving three-dimensional objects, it is necessary to take digital photographs from various directions. We studied a lossless cording method using the rotation compensation for the image sequence of the cylindrical object. However, the method can’t be applied to arbitrary objects. In order to apply the rotation estimation method to an arbitrary object, the knowledge on the cross-sectional shape of the object is required. In this paper, we propose a method to estimate a cross-sectional shape of the object using a pattern matching method.
Recently, large amounts of digital contents can be accessed by networks. Now the problem of protection of multimedia information becomes more and more important because digital contents can be easily copied without any distortion or degradation. For a solution of this problem, studies on digital watermarking techniques are advanced. There are many types of attacks against the watermark, such as the image processing, the image compression, and so on. Especially, the watermarking method which can hold the high robustness for the image compression is desirable because of the image compression is inevitable for preservation and transmission of image data. This paper describes the digital watermarking method, which has robustness to attack by JPEG compression, based on the relationship between the DCT coefficients.
This paper describes a smart remote sensing system that can detect scattered mine weapons by making use of an infrared ray (IR) camera. The object (mine) detection method proposed uses parallel image processing based on time difference or subtraction images from the IR camera. Because of the danger involved, it is desirable for mines to be detected from the most remote endeavoring. In the case that mines are buried in the ground, we can detect them if there is a sufficiently large temperature gradient between the ground and the radiant heat around the mine position. First, a cold water solution is sprayed over the surrounding region to cool the ground. Then we measure the temperature of this surface with an IR camera. In this time, we can obtain time difference images by checking the difference in temperature of the soil and the radiant heat of the buried mine object and the cooling speed. Each subtraction image is processed in real time by using pipelined image processing software implemented on a Linux platform PC.
A method is proposed to detect the variations of the paper running speed in a sheet-through type scanner. The variations are detected by analyzing the deformations of straight lines in the read-in images.
It seems that to manufacture a die or to make a cast is called “monotsukuri” (manufacturing). Various new technologies, such as CAD, CAM and 3D CG, and RP (Rapid Proto Typing), are being learned in this field of this “monotsukuri” by improvement in the speed and downsizing of a computer. But as such new technology is learned, it seems that an opportunity to make objects with one’s hand is decreasing, and people’s concern is also decreasing. The educational field is also enough considered about educating new technology. Then, we had a chance of the trial to make objects with one’s hand using new technology including 3D CG at schools, so we introduce the process of this trial and consider the use of new technology in the “monotsukuri” education.
With the rapid development of computer and network technology, it is easy to acquire digital images through the Internet or even using a cellular phone equipped with a CCD camera. Consequently, the demand for easily accessible image-database increases. It will be realistic to build an image database that accepts an image as a query-key to search and extract other images, which share some common features with the key image. This research builds a flower image database that receives a flower image taken in the natural environment as an input, and presents some information about the flowers. We propose a database query mechanism based on the feature matching and interactive and iterative dialog between the system and the user for rapid and reliable information retrieval.
It proposes an image expression technology different from the scanning line method. Because the resolution worsens inevitably if the display size is enlarged in the scanning lines method, the proposing display format is independent of the display size. As for this, all the image data is shown by a digital bit, and the image data of what resolution is expressible. The format expresses the display object and it’s moving, then it is suitable both for still and moving pictures. Moreover, it fits the packet transmission, so that the transmission of the still and moving pictures are enabled in the digital networks.