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Image processing device and image processing method

An image processing device and image processing technology, applied in image data processing, image communication, image enhancement and other directions, can solve problems such as unclearness and low contrast, and achieve the effect of emphasizing contrast

Active Publication Date: 2018-03-16
SHIMADZU SEISAKUSHO CO LTD
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  • Claims
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Problems solved by technology

[0002] Generally, when an image includes a bright area (area with high luminance value) and a dark area (area with low luminance value), there is a difference in luminance between the two areas, but the difference in luminance disappears within each area. , The contrast tends to be small and unclear

Method used

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  • Image processing device and image processing method
  • Image processing device and image processing method
  • Image processing device and image processing method

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Embodiment Construction

[0037] Embodiments of the present invention will be described below with reference to the drawings.

[0038] figure 1 is a block diagram of the radiation imaging device according to the embodiment, figure 2 is a flow chart showing the flow of a series of image processing related to the embodiment, image 3 is a schematic diagram of brightness histogram and color scale transformation (tone curve), Figure 4 is an example of a weighting coefficient in the case of emphasizing contrast, Figure 5 is an example of weighted addition for calculating the color scale conversion value, Image 6 It is a flowchart showing the flow of processing by the tone scale conversion unit. In this embodiment, as an object of image processing, a digital image (input image) which is a radiographic image obtained by a radiographic imaging device is used as an example for description, and the color scale of pixels in the input image is compared with the image after image processing. The correspon...

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Abstract

A representative value calculator calculates a representative value which is a luminance value representing a main inspection object area from an input image. On the other hand, an image divider divides an image area of the input image, and sets a plurality of divided ranges. A factor calculator calculates a tone conversion factor for enhancing or suppressing contrast adjacent the representative value calculated by the representative value calculator for each area (each divided area) divided by the image divider. A tone converter converts the tone of each pixel of the input image based on the tone conversion factor for the range divided by the image divider, which range includes a pixel for image processing, and ranges adjacent that range. As a result, the contrast of the area for which enhancement is desired can be enhanced optimally.

Description

technical field [0001] The present invention relates to an image processing device and an image processing method for processing an input image as an input digital image, and in particular relates to a technology of color scale conversion. Background technique [0002] Generally, when an image contains bright areas (areas with high luminance values) and dark areas (areas with low luminance values), there is a difference in luminance between the two areas, but the difference in luminance disappears within each area. , The contrast tends to be small and unclear. For this problem, there is known a method of generating a luminance histogram of an image whose horizontal axis is luminance value (gradation value) and whose vertical axis is frequency (frequency), and performing gradation to make the distribution of luminance uniform. By converting, the contrast of the gradation with a large number of elements (frequency of the same luminance value) is emphasized. Contrast can be e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T7/00
CPCG06T5/40G06T5/008G06T2207/20021H04N1/4074
Inventor 大野义典
Owner SHIMADZU SEISAKUSHO CO LTD
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