Seiko Epson Corporation

Kenji Mori

Takashi Kurumisawa

Hiroshi Horiuchi

Takekuni Yamamoto

An image display device corrects image data, which are used for displaying an image, using a gray scale value assigned to each pixel and also controls a source light luminance of a light source. The image display device includes a scene change detection device, an image correction device, a source light luminance control device, and a time characteristic control device. The scene change detection device detects a change of scene of the input image data. The image correction device corrects the image data. The source light luminance control device controls the source light luminance. The time characteristic control device changes a first time characteristic of a change in the source light luminance and a second time characteristic of an image correction amount by which the image data are corrected on the basis of the change of scene and executes a process on the basis of the first time characteristic and the second time characteristic.

Image display device, image display method, image display program, recording medium containing image display program, and electronic apparatus

An image display control device calculates a lighting luminance after reduction in luminance and an image correction coefficient by real-time calculations of a common calculator. The common calculator is controlled by microcodes stored in a code table. When correcting an image, chroma correction is enhanced to suppress a decrease in chroma due reduction in luminance, and a flicker is prevented by series infinite impulse response (IIR) filtering processes. When the image has a low average luminance but has a high chroma, a decrease in chroma is suppressed by limiting a reduction in lighting luminance.

Image display control device

An image display device corrects image data, which are used for displaying an image, using a gray scale value assigned to each pixel and also controls the amount of source light emitted from a light source. The image display device includes a source light amount control device and an image correction device. The source light amount control device determines the amount of source light and then controls the amount of source light. The image correction device corrects a signal used for changing saturations of the image data so as to reduce a change in the saturations due to a change in the amount of source light, the change in the amount of source light being performed by the light source amount control device.

To provide an image processor, an image processing method, and an image processing program which make it possible to perform high-speed image correction suitable for motion pictures while reducing a memory resource, etc., an image processor that corrects input image data having a predetermined grayscale range is provided. The image processor includes a coefficient holding device to hold correction coefficients of a correction curve that corresponds to the entire grayscale range or a portion of the grayscale range and includes one or more correction points and a combination portion that is formed of a combination of a plurality of specific curve pattern portions, a correction amount determination device to determine a correction amount based on statistical information of grayscale values of pixels in the image input data, and a correction device to correct the input image data by adding the product of the correction amount and the correction coefficients determined by the input image data to the input image data.

Image processor, image processing method, and recording medium on which image processing program is recorded

Aspects of the invention can provide an image processing circuit for gray scale correction, an image display apparatus, and an image processing method that allow reduction in the storage capacity needed for storing correction characteristics data without increasing clock rate in relation to interpolation processing of correction characteristics. A exemplary image processing circuit according to the invention can be applied, for example, to color correction or gamma correction of color image data. Gray scale correction characteristics data for a number of gray scale levels that is less than the number of gray scale levels of input image data can be stored in first and second lookup table storing units. Considering a gray scale value of a pixel that is being considered for gray scale correction processing as an input gray scale value, the first and second lookup-table storing units are referred to, obtaining an output gray scale value corresponding to the input gray scale value and an output gray scale value corresponding to an adjacent input gray scale value. An adjacent gray scale value refers to a gray scale value that is higher by one or lower by one than another input gray scale value. Then, output gray scale values between these two adjacent output gray scale values can be calculated by linear interpolation, obtaining output values for all input gray scale values. Subsequently, gray scale correction can be performed for each pixel of input image data, outputting corrected image data.

Image processing circuit, image display apparatus, and image processing method

To enable processing both the image data of RGB and the image data of CMYK and enhance printing speed, the following measures are taken. An image processor for printing according to the present invention is provided with an expander for expanding both the image data in the first color space of RGB and others and the image data in the second color space of CMYK and others and image data supply means for converting expanded image data to the image data in the second color space and supplying it to a print engine if the expanded image data is the image data in the first color space or supplying expanded image data to the print engine without converting it if the expanded image data is the image data in the second color space. If image data in the first color space is supplied from a host computer and if image data in the second color space is supplied, the image data is also once compressed and is stored in a memory, the compressed image data is expanded by the image processor for printing as it is, is converted only in the case of the image data in the first color space and is supplied to the print engine as the expanded image data in the second color space.

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Matsumoto, Japan

Kenji Mori