Sharp Kabushiki Kaisha Corporation

Hideyoshi Yoshimura

Masakazu Ohira

Kyosuke Taka

Tomoe Matsuoka

Daisuke Usui

The liquid crystal display device, included in the multi-display device, includes (i) a receiving sectionfor receiving display image data indicative of a display image to be displayed on a display panelof the liquid crystal display deviceand (ii) a light intensity determining sectionfor determining light intensity for each of segments of a backlight deviceof the liquid crystal display device. When the receiving sectionreceives peripheral display image data, which is indicative of a peripheral image contiguous to the display image, the light intensity determining sectiondetermines the light intensities of the respective segments based on the display image data and the peripheral display image data.

Liquid crystal display device, multi-display device, method for determining light intensity, and storage medium

A local density calculation section calculates a density of a pixel region with a predetermined size including a current point of an input image disposed at the center on the basis of a pixel value of the pixel region. A mixing ratio calculation section generates a coefficient set of coefficients &#x3b1; and &#x3b2; in accordance with a local density value calculated by the local density calculation section, and outputs the generated coefficients &#x3b1; and &#x3b2; to a weight process section. The weight process section multiplies an operation result obtained from the input image by a first filter operation section by the coefficient &#x3b1;, multiplies an operation result obtained from the input image by a second filter operation section by the coefficient &#x3b2;, adds the multiplied results to each other and outputs the result of addition as a process result of a spatial filter process section.

Using separate coefficients to weight and add separate images together from a spatial filter process

When compressing continuous tone bit map image data, the image compression section of the image compressing apparatus segments the continuous tone bit map image data into bit map image data for lossy compression, index image data for lossless compression and bit map image data for lossless compression based on pixel identification information data. The lossy compression section of the image compression section performs lossy compression process according to the JPEG method for the bit map image data for lossy compression, and the first lossless compression section thereof performs lossless compression process according to the JBIG method for the index image data for lossless compression. Furthermore, the second lossless compression section thereof performs lossless compression process according to the JPEG-LS method for the bit map image data for lossless compression.

Image compressing apparatus, image compressing method, image decompressing apparatus, image decompressing method, image forming apparatus and recording medium

An image processing apparatus includes (i) a repulsive force generating section for setting repulsive force values RVa and RVu of a quantized pixel according to an output pixel value of the quantized pixel, (ii) a repulsive force calculating section for calculating a repulsive force value RVC to be used in quantizing a quantization-target pixel by attenuating, according to a distance between the quantized pixel and the quantization-target pixel, the repulsive force values RVa and RVu set for the quantized pixel; and (iii) a threshold value correcting section for correcting a threshold value T used in quantizing the quantization-target pixel according to the repulsive force value RVC. This makes it possible to prevent an increase in the number of processing steps and amount of processing when an image is processed with an error diffusion method. At the same time, it is possible to prevent decrease in image uniformity and formation of a pattern unique to the error diffusion method.

Image processing system and method for quantizing an image by using an error diffusion method

When inputted pixels from an input DMA unit, a packing unit outputs data package. One data package consists of &#x3b1; inputted pixels. A memory control unit writes, on a write line memory at a write interval, the data package that is outputted by the packing unit. The write interval is &#x3b1; times longer than an input interval at which the pixels are inputted into the packing unit. During the writing process, the memory control unit reads out another data package from a read line memory at a read interval that is the same as the input interval. In addition, the memory control unit treats the write line memory as the read line memory, after completing the writing process. Alternatively, the memory control unit treats the read line memory as the write line memory, after completing the reading process.

Pixel input-output method, image compressing method, pixel input-output apparatus, image compressing apparatus, image processing apparatus, image forming apparatus, computer program and recording medium

A storage process section stores, into an exceptional reference image list, discrimination information for discriminating a reference image which permits image processing and a reference image which forbids or restricts image processing. In case where a maximum value of a similarity calculated by a voting process section is not less than a threshold value, a control section determines whether a reference image having a maximum similarity is the reference image which permits image processing or a reference image which forbids or restricts image processing and determines whether or not it is necessary to forbid or restrict image processing with respect to input image data in accordance with a result of the determination. This makes it possible to prevent erroneous determination from forbidding execution of image processing based on input image data or to prevent erroneous determination from allowing execution of image processing based on input image data.

Image processing apparatus, image forming apparatus, image processing system, and image processing method

The present invention provides an image processing apparatus capable of preventing deterioration of judgment accuracy when performing document matching process. To be more specific, when selecting feature points in the neighborhood of a target feature point, a predetermined number of feature points are selected after excluding a prespecified number of feature points in turn from the feature point nearest to the target feature point. For example, when the plurality of feature points are selected, the plurality of feature points, after excluding at least a feature point existing at a position nearest to the target feature point, are selected. Thereby, without increasing the amount of feature points for calculation of features (feature vectors), it is possible to prevent the deterioration of judgment accuracy.

Image processing apparatus and image processing method

An asymmetrical multiprocessor system includes a plurality of processors. At least the first processor and the second processor are asymmetrical to each other. The plurality of processors execute a plurality of unit jobs, workloads for which are foreseeable, the unit jobs being allocated job by job to the plurality of processors. For this purpose, a unit job list, which is used as reference information when the unit jobs are allocated to the plurality of processors, are prepared. Based on the unit job list, unit job scheduling is performed, so as to determine in what order the unit jobs are to be executed, and to which processor the unit jobs are to be allocated. With this arrangement, it is possible to attain a high capability with less hardware resources.

Asymmetrical multiprocessor system, image processing apparatus and image forming apparatus using same, and unit job processing method using asymmetrical multiprocessor

An anti-tampering signature apparatus is provided with an extraction portionfor extracting a characteristic quantity that represents a characteristic of image data according to an instruction from a certifier who has certified display data, an encryption/decryption portionthat generates encrypted data by encrypting the characteristic quantity using an encryption key paired with an identifier and decrypts the encrypted data into the characteristic quantity, a media writing portionthat appends the identifier and the encrypted data to a rewritable medium, and a controllerthat judges whether or not the decrypted characteristic quantity and the characteristic quantity extracted from image data generated by reading the display data match.

Anti-tampering signature method for rewritable media, anti-tampering signature apparatus for executing the method, anti-tampering signature system provided with the apparatus, and computer-readable recording medium storing anti-tampering signature program for achieving the method

A pseudo-random number generator comprises a controller, a plurality of LFSRs, a FIR filter and a normalizer. The pseudo-random number generator initializes the LFSRs in such a manner that each LFSR has a predetermined phase difference with the other LFSRs, sets the coefficient of the FIR filter in accordance with the desired frequency characteristic of a noise signal, and sets a parameter in the normalizer. The operation of the LFSRs is started, thereby acquiring a noise signal having the desired frequency characteristic.

Signal processing method, signal output apparatus, signal processing apparatus, image processing apparatus, and image forming apparatus

An image composite processing method for composing a plurality of images, each having a duplicate portion, into a single composite image based on a retrieved duplicate portion, wherein the duplicate areas of every two adjacent composite subject images are compared and one of the duplicate areas is adopted based on the comparison result.

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Yamatokoriyama, Japan

Hideyoshi Yoshimura