Image data processing apparatus and method of processing image data

A technology of image data and processing device, which is applied in image communication, parts of color TV, parts of TV system, etc., can solve the problem that gamma correction of displayed image cannot be guaranteed, and achieve the effect of suppressing the influence of noise

Inactive Publication Date: 2007-05-16
KAWASAKI MICROELECTRONICS
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  • Abstract
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Problems solved by technology

However, since the same gamma correction memory is selected for different scenes even if the APL value is the same, the techni

Method used

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  • Image data processing apparatus and method of processing image data
  • Image data processing apparatus and method of processing image data
  • Image data processing apparatus and method of processing image data

Examples

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Example

[0048] [First Embodiment]

[0049] FIG. 1 is a block diagram showing the configuration of a first exemplary image data processing apparatus according to the present invention. The example apparatus 10 shown in FIG. 1 includes a luminance characteristic detection circuit 1 , a correction parameter setting circuit 2 , and a display data generation circuit 3 . The luminance characteristic detection circuit 1 detects the luminance characteristic of input image data. The correction parameter setting circuit 2 sets correction parameters according to the luminance characteristics detected by the detection circuit 1 . The display data generation circuit 3 corrects the input image data using the correction parameters set by the correction parameter setting circuit 2, and generates display data to be output to the display device. The correction parameter setting circuit 2 and the display data generation circuit 3 constitute a correction circuit 4 .

[0050] FIG. 2 is a block diagram ...

Example

[0087] [Second Embodiment]

[0088] In the first exemplary embodiment, in determining the luminance characteristics of the frame, the luminance characteristics or accumulated luminance values ​​of all pixel blocks are equally used. That is, the accumulated luminance values ​​of all pixel blocks are compared with each other to obtain the maximum luminance value or the minimum luminance value without performing different processing on them. However, it is possible to set an index to be considered when comparing the luminance characteristics of pixel blocks.

[0089] FIG. 7 is an example block diagram showing another example embodiment of the luminance characteristic detection circuit 1 . In this example embodiment, the pixel block is set with a significant bit as an exponent and stored in the significant bit memory 17 . In order to use the valid bits, necessary valid bits therein are read out from the valid bit memory 17 and stored in the valid bit register 18 . The valid bit...

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Abstract

The brightness characteristic detection circuit 1 divides the frame 21 into a plurality of pixel blocks 22 , detects average brightness characteristics of respective pixel blocks, and obtains the maximum or minimum brightness value of input image data from the average brightness characteristics of the pixel blocks. Correcting input image data with correction parameters set in accordance with the detected maximum or minimum brightness value generates display data. Even if a noise is incorporated in the image data, the influence of the noise is suppressed and the image data may be processed accurately.

Description

technical field [0001] The present invention relates to an image data processing apparatus for generating display data to be output to a display device based on image data input thereto. The invention also relates to a method for processing image data. Background technique [0002] In an image data display device, a technique of improving the contrast of a displayed image by performing gamma correction based on the APL (Average Picture Level) of an image signal is known. That is, according to the APL value, the gradation levels of the bright portion and the dark portion are corrected. [0003] For example, Japanese Patent Laid-Open No. Hei 6-6820 (Patent Document 1) proposes a method for performing gamma correction based on the APL value by preparing a plurality of gamma correction memories for storing respective gamma correction values ​​and selecting one of the memories. A technology that improves the contrast ratio of a display device. However, since the same gamma cor...

Claims

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Application Information

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IPC IPC(8): H04N5/202G09G5/10
CPCH04N5/20G09G2360/16G09G3/20G09G2320/066
Inventor 和泉武人
Owner KAWASAKI MICROELECTRONICS
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