Kabushiki Kaisha Toshiba

Shigeki Kamimura

Satoyuki Ishii

Tadashi Oguma

Yuichi Honda

Tsutomu Fujishima

An embodiment has a C separating circuit which separates a carriage color signal and which outputs a reference, a lead, and a delayed composite video signals, a filter that extracts a high-frequency carriage color component with a significant variation in hue from the carriage color signal, a first calculation circuit which outputs a first luminance signal, a second calculation circuit which subtracts the carriage color signal from each of the reference, the preceding lead, and the delayed composite video signals and which derives a second luminance signal having an intermediate value, and a selection circuit which outputs the second luminance signal when the high-frequency carriage color component has a value larger than the reference value and which derives the first luminance signal when the high-frequency carriage color component has a value smaller than the reference value.

Luminance signal/carriage color signal separating circuit and method

According to one embodiment, a gamma correction circuit including a serial storage unit which serially stores first and second parameter information in a storage area, a first parallel storage unit which parallelly stores the first parameter information in the storage area, a second parallel storage unit, a gamma correction unit which receives a video signal and which performs gamma correction to the video signal based on the first or second parameter information, and a control unit which serially reads the first or second parameter information, parallelly stores the information in the first or second parallel storage units, parallelly reads the first or second parameter information, supplies the information to the gamma correction unit, and performs gamma correction to the video signal based on the first or second parameter information.

Gamma correction circuit, gamma correction method, and image processing apparatus

According to one embodiment, a display apparatus having a display, a signal-processing unit, a luminance-curve converter, a histogram-extracting unit, a characteristic-control-data output unit, an integrator, and a multiplier. The signal-processing unit processes a video signal. The converter converts the input/output characteristic of the luminance level of the video signal. The histogram-extracting unit generates histogram distribution data for a luminance level of a video signal. The characteristic-control-data output unit sets a characteristic to the luminance-curve converter so that the converter emphasizes a low-luminance region of the image represented by the input video signal. The integrator integrates data items pertaining to the region emphasized by the converter, thereby generating an integrated value. From the output of the integrator, the multiplier generates an output that lowers the light-adjusting voltage applied to the display device.

Display apparatus and method of controlling the backlight provided in the display apparatus

A noise reduction device for generating a delay frame by delaying an input frame in each frame, a first difference value between the delay frame and the input frame, a line delay frame by delaying the input frame in each line, and a second line delay frame by delaying the delay frame in each line. The device generates a second difference value between the input frame and the line delay frame, a third difference value between the delay frame and the second line delay frame, a fourth difference value between the line delay frame and the second line delay frame. The device corrects the input frame by using the first difference value based on a logical sum (or product) of the third difference value and the fourth difference value, and the delay frame based on a logical sum (or product) of the second difference value and the fourth difference value.

Noise reduction device for a video signal and noise reduction method for a video signal

According to one embodiment, an embodiment of a pixel conversion device of the invention improves outlines of edge peripheries of characters, etc., of a color digital image signal. The device includes a histogram extraction module, a picture characteristic extraction module which detects a luminance boundary in a luminance signal block on the basis of histogram information, sets a color-difference boundary of the same pattern as that of the luminance boundary to a virtual color-difference signal block, and generates a control signal for unifying the same area by pixel data of the same value, and a data rate conversion module which converts a color-difference signal block before conversion into the same data rate as that of the luminance signal block to correlate the converted color-difference signal block to the virtual color-difference signal block, corrects resolution and obtains a color-difference signal for a format of 4:4:4.

Pixel conversion device and pixel conversion method

According to one embodiment, a display apparatus including a receiving unit, two signal processing units and, a luminance-curve converter, a display device, a histogram-extracting unit, and a characteristic-control-data output unit. The unit sets a characteristic to the luminance-curve converter in accordance with histogram distribution data. The display apparatus further comprises a first control-signal generating unit, a second control-signal generating unit and a selector. The unit generates a first control signal that reduces amount of light emitted from the backlight to a value corresponding to the value obtained by integrating the data for emphasizing the low-region, in the luminance-curve converter. The unit determines darkness of the image from the histogram distribution data and generates a second control signal that reduces amount of light in accordance with the darkness of the image. The selector outputs one of the control signals output from two control-signal generating units, which reduces amount of light.

An apparatus for processing a video signal comprises receiving units for receiving video signals, filter units for repeating filtering processing in two or more times of generating a new pixel at a position at which adjacent pixels of the received video signal are mutually weighted by a ratio of roughly 3:1 and generating a new pixel at a position at which precedingly generated adjacent pixels are mutually weighted by a ratio of roughly 3:1, and selection units for respectively selecting a pixel to be extracted among pixels to be performed filtering processing in two or more times on the basis of a scaling ratio to discriminate a position of a pixel to be output.

Apparatus and method for processing video signal

A video signal processing apparatus comprises an A/D converter for digitizing an analog video signal, an integration circuit for integrating the digitized video signal within a predetermined integration range, a picture display device for displaying a picture based on an integration output, and a control unit which, when an offset adjustment signal is inputted to the A/D converter, corrects the offset value so as to eliminate a difference between the integration value of the integration circuit and a preliminarily set specified value, and determines whether or not offset adjustment is completed based on the number of times when the corrected offset value is within a range defined by adding a predetermined error to the specified value.

Growing community of inventors

Tsurugashima, Japan

Shigeki Kamimura