Hitachi, Ltd.

Other

Hitachi Video and Information System, Inc.

Hitachi Video Information System, Inc.

Haruki Takata

Takaaki Matono

Mitsuo Nakajima

Yasutaka Tsuru

Katsunobu Kimura

Masato Sugiyama

Takeshi Sakai

Kenji Katsumata

Shigeru Hirahata

Kazuo Ishikura

Yasuhiro Hirano

Kouichi Ishibashi

Hiroshi Aoki

Ryo Hasegawa

Yoshiaki Mizuhashi

Koichi Sudo

Tatsuo Nagata

Wataru Kato

Mituo Konno

Masato Oshikiri

Takehiro Uzawa

Takashi Hasegawa

Atsushi Maruyama

Toshiyuki Kurita

Toshinori Murata

Takanori Eda

Kazutaka Naka

Kazuhiro Kaizaki

Sunao Suzuki

Shinobu Torikoshi

Tsuguo Itagaki

Hiroyuki Urata

Hirofumi Sakamoto

Shoji Kimura

Akira Kitazume

Masaaki Matsukawa

Atushi Haratani

Takashi Kanehachi

Misako Nakagawa

Fumio Sogabe

Hidenori Takata

A video display device that allows the color temperature of the signals in white color attributes having high luminance and low chroma saturation to be corrected with high precision is provided with a color temperature correction method so as to visually obtain a desirable white color on display. In some embodiments, the signal processing circuit can include an A/D converter to convert video signals into digitalized signals, a matrix circuit to convert the digitalized signals into luminance signals and at least two color difference signals, a hue conversion circuit to obtain hue signals from the color difference signals, a hue correction circuit to correct hue signals, a chroma saturation conversion circuit to obtain chroma saturation signals from color difference signals, a chroma saturation correction circuit to correct chroma saturation signals and a color temperature correction circuit to perform the color temperature correction on the respective hue and chroma saturation signals.

Video display device and color temperature correction method for the same

Image quality adjustment of an inputted image signal is performed with higher accuracy to display a more preferable image to the user. An attribute information determining unit obtains first attribute information indicating the format of the inputted image signal and second attribute information indicating transmission characteristics of the image signal. An image quality adjustment value calculating unit calculates optimal image quality adjustment values for the image signal from the obtained first and second attribute information. An image processing unit adjusts the image quality of the image signal based on the optimal image quality adjustment values and then outputs the image to an image display. The second attribute information includes the bit rate, resolution, and frame rate of the image signal.

Image processing apparatus and image processing method

The present invention provides a video reproducing device which provides a function of reproducing a still image file and a moving image file recorded onto a recording medium in plural formats so that a user can easily identify a matched statuses of the files in the video reproducing device and can select and operate a target file as well as a control method therefor. The present invention displays an index screen in which thumbnails of a still image file and a moving image file in plural formats read from a recording medium are arrayed and further displays icons for clarifying a match relation between the video reproducing device and the files.

Video reproducing device

A picture display technique carries out an adjustment of image quality of an inputted picture signal in response to a type of the inputted picture signal, e.g., a type of a first picture signal into which a second picture signal, having fewer scanning lines than that of the first picture signal, is converted, and an original type of the first picture signal, and then displays a picture of an adjusted picture signal on a display device. Further, the adjustment of the picture quality may include at least one of hue correction of the inputted picture signal in a certain hue range and chroma correction of the inputted picture signal in a certain chroma range. The adjustment of the picture quality may also include a contour correction of the inputted picture signal.

Picture display system for adjusting image quality of a picture signal having higher number of scanning lines

An image display apparatus is provided for receiving a digital image signal and displaying it so that high-quality images can be displayed with the noise reduced not to be conspicuous and with the contour appropriately corrected. The image display apparatus includes an input unit to which the digital image signal is applied, an information detection/separation circuit which detects and separates frame encoding information and bit rate information from the digital image signal, a picture quality correcting unit which makes contour correction/noise reduction process on the digital image signal, and a control circuit. The control circuit controls the picture-quality correcting unit to make the above process by using the frame encoding information and bit rate information from the information detection/separation circuit.

Image display apparatus and picture quality correction

The present invention provides a technology for using an STB in conjunction with various display panels that comprise different types of display devices. The present invention comprises a display panel (), which includes a memory section () and a transmitter section (). The memory section () stores identification information (ID information), which includes the information about the type of a device constituting the display panel () and/or the specifications for the display panel. The transmitter section () transmits the ID information stored in the memory section () to a signal processing apparatus (). The signal processing apparatus () includes a control circuit (), which receives the ID information transmitted from the display panel (), determines the device type of the display panel and/or the specifications for the display panel from the received ID information, and exercises control in accordance with the determination result to change the operation of the signal processing apparatus.

Display system and display panel and signal processing apparatus for use with display system

A video signal processing apparatus includes a characteristic detection circuit for detecting luminance distribution corresponding to one frame of a video signal, a contrast compensation circuit for compensating contrast of the video signal, an edge compensation circuit for compensating an edge portion of the video signal, and a control circuit for determining a luminance range to be controlled on the basis of the luminance distribution detected by the characteristic detection circuit, and controlling the contrast compensation circuit and edge compensation circuit to conduct predetermined compensation on the video signal belonging to the luminance range. The control circuit controls the contrast compensation circuit to increase contrast for the video signal in the luminance range as compared with the video signal in other regions, and controls the edge compensation circuit to make an edge compensation quantity for the video signal in the luminance range smaller as compared with other regions.

Video signal processing apparatus, for controlling contrast compensation and edge compensation in relation to each other in depedence on luminance of an image, and television receiver including the same

An object of the present invention is to provide an image display technology with which high contrast can be stably obtained. In order to achieve the above object, the present invention changes the gain of a digital luminance signal by feeding back information on maximum and average luminance levels of the luminance signal, adjusts image contrast, and in accordance with the average luminance level detected from the feedback system, controls the illuminance of the backlight applied to a display unit. The control increases the illuminance of the backlight when the detected average luminance level is higher than the upper-limit value of a previously set reference range, and reduces the illuminance when the detected average luminance level is lower than the lower-limit value of the reference range.

Image display apparatus, display unit driver and image display method for the same

A video display apparatus comprises a color temperature correction circuit which controls temperature color of an input video signal; a display device which displays an image upon basis of said video signal corrected by said color temperature correction circuit; and a signal producing circuit which obtains a hue signal from said input video signal. The color temperature correction circuit controls said hue signal corresponding to the video signal of white color attributes, which has luminance equal to or greater than a predetermined value and chroma saturation equal to or less than a predetermined value, whereby achieving the color temperature correction.

The present invention provides a movement correction frame count transformation apparatus for carrying out frame count transformation processing on a picture signal. In the apparatus, an input picture signal (S ) of interlaced scanning is converted into a signal (S ) of sequential scanning by an IP conversion unit ( ). A movement detecting unit ( ) detects movement detection signals (MD and MD ). A block unit movement vector searching unit ( ) detects a block unit movement vector (BMV) by carrying out block matching processing. A movement vector correcting unit ( ) carries out miniblock division processing to generate a movement vector (BV) if a movement correction error is equal to or greater than a threshold value. A pixel unit movement vector generating unit ( ) generates a movement vector with a smallest error component between a frame signal of a current frame and a frame signal of an immediately preceding frame as a movement vector of a pixel. An MC interpolation frame signal generating unit ( ) generates an interpolation frame in movement correction processing carried out by a median filter in order to produce a signal (S ) of sequential scanning as a result of frame count transformation based on movement correction.

Method and device for converting number of frames of image signals

A low-cost motion-compensated picture signal scan conversion circuit ensuring high picture quality is to be provided. The circuit has a motion-adaptive first interpolation signal generator; a second motion-compensated interpolation signal generator; a motion vector detector; and a setting unit for checking the reliability of motion compensation by comparing signals from the second interpolation signal generator with signals on interlaced scanning lines, and setting the selection of signals from the first and second interpolation signal generators, wherein interlaced scanned signals are converted into progressive scanned signals by setting the threshold so that the threshold become smaller with an increase in the number of re-searched blocks in the detection of motion vectors.

Circuit for scan conversion of picture signal using motion compensation

A gamma correction circuit includes a node level setting unit set predetermined level values of video signals from outside, in a case where encoded M-bit (where M is an arbitrary integer) video signals being represented by using predetermined number of sections and the level values of the video signals corresponding to 2 &plus;1 number of nodes (where n is an arbitrary integer) associated with the sections on which the node are specified, and a gamma correction unit for executing gamma correction for the M-bit video signal in accordance with the level values of the nodes set in the node level setting unit, thereby the gamma correction circuit executes gamma correction on various types of display devices.

Gamma correction circuit

A noise reduction signal processing apparatus for reducing noises accurately, such as for use in a display apparatus for displaying a video signal, has a median filter (,) which receives the video signal, and which executes a filter processing on the inputted video signal and outputs a reference signal; a subtracter (,) which is connected with the median filter (,), and which outputs a difference signal that indicates a difference between a reference signal outputted from the median filter (,) and the video signal; a minimum value detection circuit (,) which outputs the difference signal from the subtracter (,) or a limitation value, whichever is smaller, as a minimum value signal; and an adder (,) which adds a noise reduction signal obtained on the basis of the minimum value signal output from the minimum value detection circuit (,) and the video signal.

Noise reduction signal processing circuit and display apparatus

In order to carry out format conversion or scaling processing of picture signal by a memory having a small capacity, picture signals of interlace scanning are converted into picture signals of progressive scanning by interpolation by using an IP convertor 1 and a multiple scan convertor 3, a scaling processing of expansion and compression in the horizontal direction is firstly performed by using a horizontal scaling unit 5, processing of expansion, compression, frame rate conversion, synchronization and the like are secondly performed by using a vertical scaling unit 6 and commonly using memories used in scaling processing in the vertical direction and finally, color space conversion or inverse gamma processing is performed by using a picture quality improving unit 8 thereby converting the picture signals into picture signals S6 having a predetermined format.

Method and circuit for signal processing of format conversion of picture

A video signal processor which includes a circuit for converting the number of lines in a digitized video signal, a circuit for generating a display dot clock, a circuit for outputting analog pixel data subjected to a line number conversion and having a frequency different from that of the display dot clock, and a circuit for smoothing the analog pixel data; and in which a frequency fck of the display dot clock, an output frequency frk of the analog pixel data and a frequency fho of the horizontal synchronization signal satisfies an equation;

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Yokohama, Japan

Haruki Takata