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Correlation value calculation device

A computing device and correlation value technology, applied in the directions of calculation, image analysis, image enhancement, etc., can solve the problem of increasing the circuit scale of the correlation value computing device, and achieve the effect of reducing the circuit scale

Active Publication Date: 2019-12-03
OLYMPUS CORP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] With the increase in the resolution of images to be calculated for correlation values, the number of bits per pixel unit increases, and the circuit scale of the correlation value calculation device increases.

Method used

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Embodiment approach

[0027] refer to Figure 1 to Figure 7 One embodiment of the correlation value computing device of the present invention will be described.

[0028] The correlation value calculation device 100 of this embodiment is installed in a device that performs noise reduction processing, motion vector detection, etc., and calculates a correlation value at high speed.

[0029] figure 1 It is a diagram showing the configuration of the correlation value computing device 100 . The correlation value calculation device 100 calculates a correlation value between a specific area (reference block) in one image (frame) and a specific area (reference block) having the same block size as the reference block.

[0030] Such as figure 2 As shown, the correlation value calculation device 100 of the present embodiment calculates the correlation value between the reference block with the pixel of interest (tx, ty) of the image (frame) as the center pixel, and at least one reference block.

[0031] I...

Deformed example 1

[0114] For example, the correlation value computing device 100 of the above-mentioned embodiment is a circuit that computes the sum of absolute differences (SAD) as a correlation value, but the correlation value is not limited thereto. For example, the correlation value may also be the difference sum of squares (SSD), normalized cross-correlation (NCC), or zero-mean normalized cross-correlation (ZNCC), etc.

Deformed example 2

[0116] In the above-described embodiments, the block size is 9×9, but the block size is not limited thereto. For example, block sizes such as 16x16, 15x15, 5x5, and 3x3 may be used, and block sizes such as 15x9 may also be used.

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Abstract

A correlation value calculation device for calculating a correlation value between a reference block in an image and at least one selected block in the same image or in another image, said correlationvalue calculation device being provided with: a pixel value distribution calculation unit which calculates the pixel value distribution of each image, and selects a range of frequent pixel values asa valid pixel value range; a conversion coefficient calculation unit which calculates a conversion coefficient for converting the pixel values in the valid pixel value range into predetermined grayscale values; and a pixel value conversion unit which performs a grayscale reduction process on the pixels of said reference block and the pixels of said at least one selected block on the basis of the conversion coefficient.

Description

technical field [0001] The present invention relates to a correlation value computing device for computing correlation values ​​between images. Background technique [0002] In image processing such as noise reduction processing or motion vector detection, correlation value calculations between images are often performed. The correlation value represents the similarity between images. Correlation values ​​between two images (one is called a reference frame and the other is called a reference frame) in a specific region (reference block) in the reference frame and a specific region in the reference frame having the same block size as the reference block (Reference blocks) are calculated based on differences in pixel values ​​between pixels at the same position, and the like. For calculation of correlation values, calculation methods such as sum of absolute difference (SAD) and sum of square difference (SSD) are known. [0003] In noise reduction processing, motion vector d...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T5/00G06T5/40
CPCG06T7/32G06T7/80G06T7/223G06T5/40G06T5/70
Inventor 中岛彩小柴修
Owner OLYMPUS CORP
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