Abstract: An information processing system which makes it possible to protect information stored in the ROM of the system from unauthorized access by means of a debug tool. The information processing system includes a ROM for storing an unlocking program and a user program; a CPU for executing said unlocking program and said user program stored in said ROM; an on-chip debug circuit serving to output debug information of said user program as executed by said information processing system; and a debug function disabling circuit serving to disable debug functions of said on-chip debug circuit at power up and to enable the debug functions of said on-chip debug circuit when said unlocking program has been executed.

Abstract: A radiation image storage and reproduction system includes a radiation image read-out device for reading out a radiation image stored in a stimulable phosphor sheet to obtain digital image data of the radiation image; an image-concomitant information input device for inputting information of a forwarding address and/or an information of a image processing operation for the digital image data; an image processing device for processing the digital image data; a display device for visually reproducing the radiation image from the digital image data; and an image filing device for storing the digital image data.

Abstract: A radiation image read-out and reproducing apparatus wherein radiation image read-out and reproduction are carried by use of the same scanning system in the same apparatus. The light beam scanning section includes a read-out main scanning means and a reproducing main scanning means. The light source as well as the light deflector of the read-out main scanning means are the same as the light source and light deflector of the reproducing main scanning means. Further, the means for conveying the stimulable phosphor sheet for read-out and for conveying the recording sheet for reproducing are common to each other. A beam diameter adjusting means adjusts the beam diameter of the light beam between a position on the stimulable phosphor sheet and a position on the recording sheet by moving the beam diameter adjusting means into or away from an optical path of the light beam depending upon whether the light beam scans the stimulable phosphor sheet or the recorded sheet.

Abstract: A subtraction processing method for radiation images comprises the steps of obtaining a masked image signal by reading out a masked image of an object recorded without injection of contrast media into a specific structure of the object, and obtaining a live image signal by reading out a live image recorded after contrast media have been injected into the specific structure of the object. The parts of the masked image signal and the live image signal corresponding to the same picture elements in the masked and live images are subtracted, thereby obtaining a difference signal for forming an image of the specific structure. In cases where different read-out conditions are used when obtaining the masked image signal and the live image signal, one of the masked image signal or the live image signal is converted into the image signal which would have been obtained if the same read-out conditions had been used for both images.

Abstract: A radiation image read-out and displaying apparatus comprises an image signal gathering section and an image processing and displaying section. The image signal gathering section comprises an image reader for obtaining an image signal which represents a radiation image, a code reader for obtaining a code signal which identifies the radiation image, and a device for entering an instruction signal representing how to treat the image signal. The image processing and displaying section comprises a device for receiving the image signal, the code signal and the instruction signal sent from the image signal gathering section, an image processor for processing the image signal, a storage device for storing the image signal, and a device for reproducing and dislaying a radiation image by using the processed image signal. When the code signal and image signal corresponding to an insruction signal are obtained, how the image signal is treated is based on the instruction signal.

Abstract: In a radiation image system wherein a stimulable phosphor carrying a radiation image stored therein is exposed to stimulating rays which cause it to emit light in proportion to the radiation energy stored, and the emitted light is detected and converted to an electric signal which is processed to reproduce a visible image, several reference gradation correction curves are created on an orthogonal system of signal level-optical density coordinates. One of the reference curves is selected and rotated around a point on the reference curve on the coordinate system, and/or parallel-shifted on the coordinate system to obtain a desired gradation correction curve.

Abstract: A radiation image reproducing apparatus reads a radiation image out of a first recording medium and reproduces it on a second recording medium as a visible image. Input devices of the apparatus enter input data which are associated with a method of exposing an object to a radiation and object's exposed part. In response to the input data, a processing condition determining unit determines conditions optimum for a gradation processing and a spatial frequency processing. A processor system is provided for reading the radiation image stored in the first recording medium and processing the radiation image on the basis of conditions which the processing condition determining unit determines in response to the input data associated with the radiation image.

Abstract: In a radiation image recording system wherein a stimulable phosphor carrying a radiation image stored therein is scanned by stimulating rays to emit light in proportion to the radiation energy stored, and the emitted light is converted to an electric signal which is processed and used to reproduce a visible image in a light-sensitive material, a value within the range of 0.2 to 0.5 and two values at least 0.5 different from each other within the range of 0.4 to 2.6 are selected as the reference optical density values of the reproduced image. An image is once recorded in the light-sensitive material by using reference signals representing the reference values, and the optical densities at the image portions corresponding to the reference values are measured. Differences between the measured values and values on a reference gradation curve are corrected so that the sensitivity is equal to the sensitivity on the reference curve at the portion corresponding to the value selected within the range of 0.2 to 0.

Abstract: A radiation image reproducing apparatus reads a radiation image out of a first recording medium to record it on a second recording medium in a visible form after necessary image processings. Data indicative of a direction of an exposure, either from the front or from the rear of an object, is supplied so that in the case of a rear exposure the radiation image is reproduced on the second recording medium with its lateral position inverted. Data associated with the image processings is recorded in a visible form on the second recording medium together with the radiation image.

Abstract: Red, green and blue densities of a color negative are measured at a plurality of points thereon. The measured densities are normalized by a normalizing circuit so that the same levels of density signals can be obtained regardless of the gamma value and sensitivity of the negatives when the same subject matter is photographed under the same conditions. The normalized density signals are plotted in a chromaticity coordinate system and examined as to whether or not they fall within a given region defining a polygon in the coordinate system. The coordinate system is a two dimensional coordinate system in which the axes thereof represent the combinations of two color densities among red, green and blue densities. When the level of the normalized signals with respect to a given point falls within the given region defined by the polygon, the point is determined to have the particular color.

Abstract: A particular color is defined in terms of red, green and blue densities thereof. When the densities fall within a predetermined ellipsoid in a three-dimensional chromaticity coordinate system the axes of which respectively represent the red, green and blue densities, the color is defined to be of the particular color. The ellipsoid is represented by the following formula.dS.sup.2 =C.sub.11 dB.sup.2 +2C.sub.12 dB.multidot.dG+C.sub.22 dG.sup.2 +2C.sub.23 dG.multidot.dR+C.sub.33 dR.sup.2 +2C.sub.31 dR.multidot.dBwhereindB=B-BdG=G-GdR=R-RB: blue density of measured pointG: green density of measured pointR: red density of measured pointB: average blue densityG: average green densityR: average red densityRed, green and blue densities of a number of points on a color negative to be printed are measured by a measuring means.

Abstract: Red, green and blue densities of a color negative are measured at a plurality of points thereon. The measured densities are normalized by a normalizing circuit so that the same levels of density signals can be obtained regardless of the gamma value and sensitivity of the negatives when the same subject matter is photographed under the same conditions. The normalized density signals are plotted in a chromaticity coordinate system and examined as to whether or not they fall within a given region defining a particular color in the chromaticity coordinate system. When the level of the normalized signals with respect to a given point falls within the given region, the point is determined to have the particular color defined by the region in the chromaticity coordinate system. When the color negative includes a predetermined number of points of the particular color, the exposure in a color printer is controlled to reproduce the particular color in a desirable condition.

Abstract: A method is disclosed for controlling the exposure during photographic printing. The transmission density of a negative or original is measured to provide an exposure control signal. In an illustrative embodiment of this invention, the original is divided into a central portion, a peripheral portion, an upper portion, a lower portion, a right-hand portion and a left-hand portion. Means are provided for quantizing a difference in average density between the portions in the negative, which is classified into a plurality of categories in accordance with a logic of combining characteristic values of the negative. The method affords an enhancement of accuracy in exposure control and an enhancement of probability of obtaining prints of good quality.