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Image display device and/or method therefor

An image display device and image input technology, which is applied in image enhancement, image analysis, image communication, etc., can solve the problem of small dynamic range of the camera device, achieve the effect of reducing the ratio and preventing over-correction

Active Publication Date: 2014-12-17
EIZO
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The theory behind this is that camera setups have a small dynamic range compared to the dynamic range in nature

Method used

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  • Image display device and/or method therefor
  • Image display device and/or method therefor
  • Image display device and/or method therefor

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Embodiment Construction

[0041] Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

[0042] (1. Summary)

[0043] figure 1 A schematic diagram of an image display device including a corrected image generating device 20 according to the present invention is shown in . In this embodiment, the illumination light correction unit 25 , the reflectance calculation unit 27 , the image resynthesis unit 29 , the parameter automatic control unit 39 , and the histogram analysis unit 37 correspond to a grayscale correction device.

[0044] The HSV color space conversion unit 21 performs conversion from the RGB color space to the HSV color space. For the conversion from the HSV color space to the RGB color space, a conventional conversion formula is used. By using the HSV color space, the chromaticity reduction effect caused by the brightness adjustment using the YUV color space is eliminated, and visually good brightness correction can be realized.

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Abstract

The objective of the invention is to prevent image-quality degradation caused by overcorrection, while improving visibility of dark areas. A reflectance calculation unit (27) stores a parameter (RGain) for adjusting the amplitude of a reflectance component (R). A lighting correction unit (25) generates a corrected lighting component (L1) from a lighting component (L) and a formula (L1=(log(LAmp*L+1)) / (log(LAmp+1))). An image resynthesis unit (29) obtains a corrected lighting component (L') from L'=LGain*L1+(1-LGain)*L. The image resynthesis unit (29) also calculates a corrected image (Iout) from a formula (Iout=exp(logL'+RGain(logI-logL))) on the basis of the corrected lighting component (L') and a corrected reflectance (R'). By determining the value of a corrected lighting component (L') using a mixture ratio (LGain) of the output value (L1) of the correction function and the original lighting component (L), contrast to a certain extent can be maintained while a natural image is created.

Description

technical field [0001] The present invention relates to a retinal cerebral cortex theory (Retinex) processing of a display device, in particular to the adjustment of gray scale transformation intensity. Background technique [0002] Image processing based on the retinal cortex theory is known as a method for compressing the dynamic range of an imaging device. The rationale for this is that the dynamic range of an imaging device is small compared to the dynamic range in nature. Therefore, using the retinal cortex theory, the illumination light components are separated, compressed, and resynthesized, thereby compressing the dynamic range. [0003] Single Scale Retinex (SSR: Single Scale Retinex) is known as image processing based on the retinal cortex theory. In the retinal cortex theory, the incident light I is defined as the product of the illumination light L and the reflectance R (I=RL). According to the following formula, logR in the logarithmic space is used as the ou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00H04N5/66
CPCH04N5/66H04N9/68G06T5/20G06T2207/20208G06T5/94G09G5/20G06T5/92G09G5/02G09G2320/066G09G2320/0673G09G2320/0626
Inventor 安倍玲央中尾政史东正史
Owner EIZO