Abstract: The present invention discloses a sound image localization apparatus for localizing a sound image at an arbitrary location in three-dimensional space by adding an attenuation in distance to a digital filter in order to reduce an operation time of convolution and approximating the head related transfer function in a three-dimensional space thereby to control the localization in real time. The sound image localization control apparatus comprises a location sensor for three-dimensional measuring of the direction and location of a listener's head, a microprocessor for correcting sound pressure attenuation in proportion to the distance between a sound source and the head relative to a digital filter that approximates the head related transfer function consistent with the direction of the head, and a convolution processor for convolving the corrected digital filter with the monaural sound source data.

Abstract: A method for processing a radiographic image to obtain a processed image signal Sproc based on an original image signal Sorg. The method including the steps of: obtaining the original image signal Sorg representing the radiographic image based on radiographic image information transmitted through an object; obtaining an unsharp mask signal Sus corresponding to the original image signal Sorg; and conducting an operation presented by the formula: Sproc=A(Sorg)+B(Sus). In the formula, A(Sorg) is the function which does not include the unsharp mask signal Sus, B(Sus) is the function which does not include the original image signal Sorg.

Abstract: A method of reproducing a radiographic image of a subject includes processing radiographic image signals which indicates a signal level corresponding to an amount of radioactive rays transmitted through each portion of the subject. The method compresses a signal level range of a part of the low frequency region of the radiographic image signals and expands a signal level range of another part of the low frequency region of the radiographic image signals, thereby obtaining image signals that are usable to reproduce the radiographic image.

Abstract: A dynamic range compression method for a radiation image for obtaining processed image signal carrying an image having a dynamic range that is narrower than that of the original image, by processing original image signal representing an original image based on radiation image information transmitted through an object. The method is for obtaining unsharp mask signal by averaging the original image signal in a predetermined mask area containing each pixel point corresponding to each pixel point and for correcting original image signal by providing a correction value that is a function of the unsharp mask signal to obtain a processed image signal. Weighting is applied corresponding to an absolute value of a signal different between a central pixel and a peripheral pixel both within a mask area in the averaging process for obtaining the unsharp mask signal.

Abstract: An apparatus for processing radiographic image signals, including a photographing device for detecting an amount of radioactive rays transmitted through a subject and for converting the rays into original digital image signals in the form of pixels, and a signal processing circuit for processing the original digital image signals so as to decrease the amplitude of a low frequency component of the original digital image signals.

Abstract: A radiographical image reader for photoelectrically reading a radiographical image of an object. The image reader comprises a radioactive ray irradiator; a radiographical image converting panel which is a radioactive ray absorbent for absorbing the radioactive ray transmitted through through the object so that a radiographical image information is obtained; a scanner to scan the converting panel with exciting light so that the converting panel is subjected to stimulated emission; a reader to read the stimulated emission of the converting panel so that the radiographical image is obtained; a first memory to store at least one of a radioactive ray irradiating condition, object information, and image identification code; a second memory to store a radiographical image information; and a circuit to control the functions of the reader, the first memory, and the second memory in accordance with said irradiation of the radioactive ray by the irradiator.

Abstract: An exposure compensation apparatus for use in a radiographic equipment to modulate local intensity of radiation. The exposure compensation apparatus comprises a detecting means to detect transmittance of radiation at a location of a radiated object, right-left reversion means to reverse a location arrangement of the transmittance data on a line of a predetermined direction, an averaging means to average a pair of the original and reversed transmittance data of a location to acquire an averaged transmittance, and a local intensity control means to control a local intensity compensation means of the radiographic equipment.

Abstract: There are disclosed a radiation image storage panel having a stimulable layer and a protective layer on a support, which comprises a layer having a lower refractive index than the protective layer is provided between the stimulable phosphor layer and the protective layer; and a process for preparing a radiation image storage panel composed of a support, a stimulable phosphor layer and a protective layer, and a protective layer supporting member is so provided between layers of the support and the protective layer as to surround and seal edges of the stimulable phosphor layer, which comprises the steps of providing at least one notch to the protective layer supporting member which functions as a vent hole, heating and drying the radiation image storage panel, and then fusing and sealing the notch or notches.