Abstract:
A light irradiating method, an optical recording medium, and a record/playback apparatus are provided to improve SNR(Signal to Noise Ratio) in the recording operation and reproduce recorded signal appropriately by generating return beam only in the reproducing operation, not in the recording operation. An optical recording medium includes a recorded layer(51) in which signal is recorded, a 1/4 wave plate formed on the lower side of the recorded layer, a polarization plate formed on the lower side of the 1/4 wave plate, and a reflective film formed on the lower side of the 1/4 wave plate. A light irradiating method for recording/reproducing an optical recording medium includes a light emission step for emitting the light to be irradiated to the optical recording medium, and a wave plate driving step for operating the 1/4 wave plate inserted into an optical system which guides the emitted light to the optical recording medium in order to have an angle difference between the optical axis direction in the recording operation and the reproducing operation.
Abstract:
A front end signal processing method and apparatus for processing a signal from an image sensor are provided for readily clamping a black level, improving the manufacturing yield, and reducing the power consumption. A luminance detector/digitizer receives a sensor output signal from an image sensor, detects luminance information included in the sensor output signal, and generates a digital luminance signal representative of the detected luminance information. A digital processor receives the digital luminance signal, and multiplies the digital luminance signal by a predetermined gain code to generate the multiplication result as a front end processed signal output. An optical black clamp receives the digital luminance signal from the luminance signal detector/digitizer and supplies a feedback signal produced from the digital luminance signal to the luminance signal detector/digitizer to clamp a black level of the luminance signal to a constant value.
Abstract:
On the basis of the results of comparison between the threshold value of a uniform random number fed from a uniform random number generator and the pixel value of an original image signal, each pixel value of the original image signal is encoded. The encoded image signal thus generated is transferred. A decoding device having received the transferred data accumulates the encoded values in the transfer data for each kind corresponding to the pixel value in the original image signal and counts the number of accumulations to decode the encoded value corresponding to each pixel of the accumulated original image signals on the basis of the counted number.
Abstract:
The present invention provides full-parallax images having high spatial resolution in real time. An image-capturing optical unit (21) includes a plurality of prismatic mirrors (41) which rotate at a predetermined period. The side surface of each of the prismatic mirrors (41) reflects a light beam from an object. A camera receives the light beam from the object reflected by the prismatic mirrors (41) in order to capture an image of the object. On the other hand, a display optical unit (32) includes a plurality of prismatic mirrors (51) which rotate in phase with the prismatic mirrors (41) at the same period. A projector emits a light beam corresponding to the image of the object captured by the camera, and such a light beam is reflected by the prismatic mirrors (51). A user may view an image corresponding to the light beam reflected by the prismatic mirrors (51). The present invention, for example, can be applied to an image-capturing apparatus for capturing an image, and a display apparatus for displaying the image captured by the image-capturing apparatus.
Abstract:
An image is easily changed according to the user viewpoint. Original image data on an object imaged from an arbitrary point on a curved surface ohm as a viewpoint is stored. Attention is paid on a straight line Li connecting the viewpoint P and a point Ri on the object, and the intersection point of the straight line Li and the curved surface ohm is expressed as Qi. When the object is viewed from the viewpoint P, the pixel value corresponding to the light ray going from the point Ri on the object to the view point P coincides with the pixel value corresponding to the light ray going from the point Ri on the object to the point Qi on the curved surface ohm, and the pixel value corresponding to the light ray going from this point Ri to the point Qi exists on the original image data. That is, the pixel value when the point Ri on the object is viewed from the viewpoint P can be obtained from the original image data on the object imaged from the point Qi on the curved surface ohm as the viewpoint. The present invention can be applied, for example, to an image processing device for obtaining an image corresponding to a user viewpoint.
Abstract:
An image signal processing device (1) processes the output signal of a CCD image sensor (10) for reading pixel information of one frame in units of one line, dividing the pixel information, into a plurality of channels, and thereby outputting the divided information. The image signal processing device (1) determines the black level of the pixel data read from the image sensor (10) for each channel, and corrects the black level for each channel. Moreover, the image signal processing device (1) determines the gain difference of the pixel data between the channel and corrects the gain difference between the channels. Therefore, for the image sensor for dividing the image information into channels and outputting them the black level and the gain difference between channels can be corrected highly precisely.