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Image signal processing apparatus and image signal processing method

An image signal processing and signal processing technology, applied in image communication, instruments, televisions, etc., can solve the problems of image degradation, reduction of calculation accuracy, etc., and achieve the effect of reducing the data width

Inactive Publication Date: 2009-09-16
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reduction in data width is disadvantageous because calculation accuracy is lowered and images are degraded

Method used

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  • Image signal processing apparatus and image signal processing method
  • Image signal processing apparatus and image signal processing method
  • Image signal processing apparatus and image signal processing method

Examples

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no. 1 example

[0119] (Configuration of the image display)

[0120] The configuration of the image display of the first embodiment will be explained.

[0121] Figure 6 is a block diagram showing the overall configuration of the image display. Although a mode in which the present invention is applied to an image signal processing circuit built in an image display is exemplified here, embodiments of the present invention are not limited thereto. For example, it is also preferable to apply the present invention to an image signal processing circuit of a device (image output device such as VTR, digital camera, set-top box) connected to an image display.

[0122] Figure 6 The image display has a display panel (matrix panel) 1 . The display panel 1 has a configuration in which multiple electron sources and image display members (for example, phosphors) are arranged in a thin vacuum container facing each other, and many electron sources (for example, cold cathode devices 1001) are arranged in...

no. 2 example

[0161] Next, a second embodiment will be explained. In the second embodiment of the present invention, the above-mentioned second floating point data is applied to Figure 6 The image signal processing circuit of the image display. Since other configuration parts of the second embodiment are the same as those of the first embodiment, explanations thereof are omitted.

[0162] The second floating-point data may preferably be applied to a video signal (for example, an 8-bit video signal) having a data width of 8 bits and being γ-converted (γ=0.45). As a result, the data width can be suppressed to 10 bits while maintaining the gradation performance equivalent to 14 bits.

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Abstract

The invention discloses an image signal processing apparatus and image signal processing method. The image signal processing apparatus has an inverse-conversion unit for receiving-converted video signals and subjecting the video signals to processing for canceling-conversion characteristics, and a conversion unit for generating floating point data from fixed point type data which is proportional to luminance as an output from the inverse-conversion unit to transfer the floating point data or to subject the floating point data to reference table processing or signal processing, wherein the floating point data has a significand and an exponent, and the radix of the exponent is 4.

Description

technical field [0001] The present invention relates to an image signal processing device and an image signal processing method. More specifically, the present invention relates to an image signal processing device and an image signal processing method for generating drive data to be supplied to a drive circuit of a display panel based on a γ-converted video signal. Background technique [0002] Flat panel displays such as plasma display devices, liquid crystal display devices, EL display devices, electron beam display devices using electron-emitting devices, and the like are known. In these types of display devices, various signal processes are performed on an input image signal (for example, a TV signal), thereby generating drive data suitable for the characteristics of the display panel. Signal processing applied to image signals includes, for example, inverse γ conversion, color correction (see paragraphs 0076 to 0085 of Japanese Patent Application Laid-Open (JP-A) No. ...

Claims

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Application Information

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IPC IPC(8): G09G3/20G09G5/18H04N5/14
Inventor 阿部直人
Owner CANON KK