511 results about "Black level" patented technology

The control inputs of reset switch elements 41 to 45 are commonly connected to a row reset line 51. In a line black clamp type, cathodes as reset ends of photodiodes (31) of optical black pixels 21 to 23 are commonly connected to a potential averaging line 30. In a frame black clamp type, potential averaging lines are connected similarly to respective pixel rows on the vertical scanning start side of an optical black pixel region, and the potential averaging lines may be commonly connected to each other to operate just like one pixel row. A first block includes a pixel array and a vertical scanning circuit, while a second block includes sample and hold circuits, a horizontal scanning circuit, an amplifier and an A / D converter 19. In a low power consumption mode, power supply to the second block is ceased in a light integration period of one frame with performing light integration in the pixel array, power supply to the first and second blocks is performed in a read-out period of one frame to read out integrated signals, and power supply to the first and second blocks is ceased in a power-off period of one frame.

A method and a system for the compensation of Fixed Pattern Noise (FPN) in digital images have been achieved. The FPN compensation is based on processing done during the production of said images. The fixed pattern noise is here defined as the fixed pattern seen in the individual pixel offsets. The fixed pattern noise is uncorrelated noise but it has a statistical distribution that can be scaled to fit all images. The general idea is to measure the distribution for each individual camera, compress it, and save it in the module. For each image that is then taken with the module the noise pattern can be retrieved and rescaled to fit the image. Covered pixels are employed to normalize the FPN data to the current frame. In order to minimize memory requirements a compression scheme has to be used. A method combining a quantization step with a non-lossy compression is used. The black level is corrected for as part of the operation.

To appropriately adjust luminance and a black level even when characteristics of an organic EL display element should be changed due to an environmental change or heat self-generation, to display a stable image. A current detector detects a level of a total panel current flowing in an organic EL panel. The detected level is subjected to A / D conversion before being supplied to an adder. Meanwhile, a video signal is supplied to a current calculator 24 to be converted into data corresponding to the level of a total panel current, before being supplied to the adder. The adder then compares an average total panel current level, estimated based on a video signal, and an actual total panel current level, to obtain a difference so that a black level for image data to be supplied to the panel is adjusted according to the difference.

A technique for providing a liquid crystal display device which has an excellent production yield but little orientation fault.A liquid crystal display device in which an orientation regulating member 108 including a trunk portion 108a and a branch portion 108b is formed between a seal member 112 and a liquid crystal 114 so that not only a mechanical strength is enhanced but also the liquid crystal molecules can be homogeneously arrayed to establish a satisfactory black level when no voltage is applied, thereby to improve the contrast.

The control inputs of reset switch elements 41 to 45 are commonly connected to a row reset line 51. In a line black clamp type, cathodes as reset ends of photodiodes (31) of optical black pixels 21 to 23 are commonly connected to a potential averaging line 30. In a frame black clamp type, potential averaging lines are connected similarly to respective pixel rows on the vertical scanning start side of an optical black pixel region, and the potential averaging lines may be commonly connected to each other to operate just like one pixel row. A first block includes a pixel array and a vertical scanning circuit, while a second block includes sample and hold circuits, a horizontal scanning circuit, an amplifier and an A / D converter 19. In a low power consumption mode, power supply to the second block is ceased in a light integration period of one frame with performing light integration in the pixel array, power supply to the first and second blocks is performed in a read-out period of one frame to read out integrated signals, and power supply to the first and second blocks is ceased in a power-off period of one frame.

The present invention provides an image pickup device that can accurately adjust the black level value of the effective pixel area while correcting column noise contained in pixel signals of the effective pixel area. The image pickup device includes a solid-state image pickup element having a pixel part including an effective pixel area to be irradiated with light, a vertical light-shielded pixel area and a horizontal light-shielded pixel area where irradiation of light is shielded, a vertical scanning circuit, a horizontal scanning circuit, and an output circuit, a light-shielding section which shuts off light irradiated on the effective pixel area, a black level value detector which detects black level values of the vertical light-shielded pixel area, the horizontal light-shielded pixel area, and the effective pixel area shielded from light by the light-shielding section, based on pixel signals outputted from the output circuit of the solid state image pickup element, a comparator which compares the black level values, a noise component detector which detects a noise component, a noise corrector which corrects noise generated in the effective pixel area, based on the noise component detected by the noise component detector, and a controller which controls the noise component detector and the noise corrector, based on a comparison result of the comparator.

According to an embodiment, an image scanning device includes: a light source unit that emits light onto an original to be scanned; a photoelectric conversion unit that converts light from the original to an electric signal; a converting unit that converts the electric signal from the photoelectric conversion unit into digital image data; and a black correcting unit that performs black correction by correcting pixel-by-pixel black levels of pixels contained in pre-scanning digital image data obtained before the original is scanned based on a ratio of a dark-current black level of a pixel contained in ongoing-scanning digital image data obtained during scanning of the original to a dark-current black level of the pixel contained in the pre-scanning digital image data, and subtracting the corrected pixel-by-pixel black levels from the ongoing-scanning digital image data.

Apparatus and a method for improving image quality in an image sensor, where a black level of a photographed image is calibrated and luminance of an image signal is expanded within the allowable range of luminance through knee correction for the image signal in which the black level is calibrated. Interpolation for restoring a dead pixel may be achieved before gamma correction for image signal.

A backlit display with improved dynamic range.

An imaging sensor pixel array includes a semiconductor substrate, a plurality of active pixels and at least one black reference pixel. The plurality of active pixels are disposed in the semiconductor substrate for capturing an image. Each of the active pixels includes a first region for receiving light including a p-n junction for accumulating an image charge and active pixel circuitry coupled to the first region to readout the image charge. The black reference pixel is also disposed within the semiconductor substrate for generating a black level reference value. The black reference pixel includes a second region for receiving light without a p-n junction and black pixel circuitry coupled to the photodiode region without the p-n junction to readout a black level reference signal.

An imaging system capable of black level calibration includes an imaging pixel array, at least one black reference pixel, and peripheral circuitry. The imaging pixel array includes a plurality of active pixels each coupled to capture image data. The black reference pixel is coupled to generate a black reference signal for calibrating the image data. Light transmitting layers are disposed on a first side of a pixel array die including the imaging system and cover at least the imaging pixel array and the black reference pixel. A light shielding layer is disposed on the first side of the pixel array die and covers a portion of the light transmitting layers and the black reference pixel without covering the imaging pixel array.

This invention provides a liquid crystal device (D) including a liquid crystal panel (100), a touch panel (40). A position signal generating device (60) orderly selects a plurality of electrons for detection formed in the touch panel (40) and generates a shielding signal for specifying the display area superposed with the selected electrons for detection. A display control circuit (120) generates an output image data GD2 for displacing a brightness level of the display region appointed by the shielding signal to a black level and output to a drive circuit (110). So, a potential fixedly configured as a pixel electron under the electron for detection forming the selected object is able to greatly reduce the voice voltage superposed at the electron for detection along the brightness level change, so as to restrain the detection precision decreasing caused by the noise of the electron for detection.

In the case of an active matrix type TFT liquid crystal display apparatus of a dot successive driving system, between respectives of signal lines sig1A through sig4A wired at respective columns, and respectives of a signal line 18-1A for inputting a precharge signal Psig-black at a black level and a precharge signal line 18-2A for inputting a precharge signal Psig-gray at a gray level, sampling switches Pb1A through Pb4A and Pg1A through Pg4A of two routes are connected, to respectives of the signals lines sig1A through sig4A, firstly, the precharge signal Psig-black, successively, the precharge signal Psig-gray at the gray level are written in this order and thereafter, an image signal video is written thereto.