Technique of scanning colored documents has been developed. Color scanners in current use have many problems, such as scanning speed, image quarity, accuracy, etc.. Especially color adjustment is important for color scanners. In this paper, a problem of color adjustment is discussed. There is a linear transformation method. This is very simple and has a high cost performance. But an amendment of specific color is difficult. So a new grouping method for a linear transformation method is proposed.
The recent expansion of facsimile application fields has increased the need to transmit at high speed not only black and white binary images for characters, but also half-tone images including high quality photograhic images. This paper proposes periodic error diffusion method for realizing high quality half-tone images with high efficient coding availability. This paper also proposes adaptive coding scheme for images including both of characters and half-tone pictures.
This paper considers "divided hue masking method", we called. In this method, color space is divided into some areas by some planes through the achromatic axis, and each area has coefficients like linear masking method. On the accuracy of color correction, divided hue masking method is intermediate between linear masking method and second-order masking method. On the scale of circuit, divided hue masking method is close to linear masking method. We conclude that divided hue masiking method is the most suitable method for color hard copy mashine.
With recent progress in semiconductor arrays of optoelectronic bistable devices and sources, highlly parallel optical interconnection and information processing has gradually become a reality. This paper reports on Vertical to Surface Transmission Electro-Photonic devices and the resultant optical functional interconnection.
Two types of liquid crystal spatial light modulators (SLMs) with optical bistability are reviewed. One type of SLM consists of surface stabilized ferroelectric liquid crystal layer and a hydrogenated amorphous sllicon photosensor. The other is a SLM using a semitransparent Bi_<12>SiO_<20> or Bi_<12>GeO_<20> photoconductive crystal and liquid crystals with a 90° twisted nematic mode, an electrically controlled birefringence mode or a guest host mode. We describe device structures, operation principles. optical binary operations and application of these devies to image processing.
Current status of the optical neural network is reported. Several optical techniques to implement neural network models are described. In particular, the optical neurochip which is the integrated device of the optical vector-matrix multiplier is mentioned in details including the device structure and charcteriatics.
A four-story structured image sensing processor has been implemented as an application of 3D-LSIs for character recognition. Three-Dimensional LSIs will achieve very high performance by exploiting the structural parallelism by way of the inherence parallelism of an algorithm. The design of the prototype chip is described.