A lightweight and efficient image compression method which is implemented by only using several line-memories as the memory unit, was studied. A hybrid encoding method is adopted, in which one-dimensional Slant transform is used to the horizontal scanning and DPCM coding to encode the transformed coefficients is used to the vertical scanning. The Slant transform has the feature that the number of multiplication is significantly reduced with a little deterioration of image quality, compared with DCT. In this study, the Slant transform was modified to have the character like Wavelet transform, that is, it takes only high frequency coefficients at lower small blocks and takes only low frequency coefficients at the highest large block. The amount of the computation for the transform was further reduced by calculating only the low frequency coefficients at higher large blocks. The simulation evaluation of this method showed that a favorable compression performance is obtained.
In this paper, we propose a fast rate control scheme for multi-rate video encoder. To realize an effective rate control for the multi-rate encoder, we employ VBV buffer correlation of occupancy transition among each bitrate encoder. The simulation results show that the proposed method can reduce the computational complexity to 21% compared with independent multi-rate video encoder.
This paper evaluates the usability of the camera-based interface which can assign various operations by estimating camera motion on a cellular phone. Since many keys are generally mounted in a mobile phone, a complicated function can be assigned adequately, but it is hard to say that it superior to in usability. In this paper, in order to evaluate the efficiency of the camera-based interface, we implemented character input application which can intuitively select a character. Multiple subjects measured the time which input text, and performed subjective evaluations, such as usability of camera based intuitive interface. The experiment showed that operation by the intuitive interface was superior to operation by the conventional method.
This paper proposes a multimedia presentation for comic/cartoon documents. An effective use of electronic presentation media instead of the conventional paper media can make comic/cartoon documents much more impressive and active. A number of presentation elements for comic/cartoon documents are proposed and their presentation effects are studied. Some support functionalities for multimedia presentation are discussed. Major presentation elements are: a) successive display of frames, b) time-variant frame position, c) time-variant frame size, d) time-variant balloon characters (e.g., successive display, running, time-variant font size and typeface), e) color changing, f) synchronization with BGM, and g) etc.
When multimedia information is rendered and presented, pets feel a strong interest in the information, and their attention will be caught by the multimedia equipment. Therefore, multimedia equipment should be more significantly designed than other equipment, and some design guidelines are required. IEC/TC100 discussed those requirements and suggested that a technical report should be developed. Responding the requirements, this paper studies some behavior of dogs to multimedia information and proposes a design guideline for multimedia equipment.
Recently, It is necessary to show the sight of a remote place as a picture. In that case, to be abundant amount of information an rich presence are demanded from the picture shown. Therefore, in case a photograph is taken, free viewpoint and the corporal vision by the obtained picture are expected a possible thing. In this paper, In this paper, we will propose system which used one camera and a spin mirror to generate the free viewpoint 3D image. In this system, we use a method which called a light processing algorithm to make a free viewpoint 3D image form the obtained photography picture. The reliability of the proposed method is discussed with some simulation results.
Algorithms for “ Computational Color Constancy ” have been studied as techniques for spectral reflectance estimation of objects, apart from the “ Color Constancy ” ability of the human vision system. However, they recently turned out to be useful tools for “ Color Appearance Matching ” for human observers. This development is introduced, at first. Then, “ the Illuminant Color Estimation from an Image ” - the most important problem in the computational color constancy study - is discussed. In addition to conventional methods (e.g. gray world model etc.), new illuminant color estimation methods that make use of the color distribution within an image were developed. However, because every image does not necessarily satisfy the conditions that are indispensable for the application of the methods, novel methods need to be studied. The last part of this paper proposes a new illuminant color estimation method, which is based on the dichromatic reflection model, and disusses its availability.