JPS63205781A - Image analyzer - Google Patents

Abstract

PURPOSE:To improve analyzing accuracy be extracting an image converted into another color space from a color digital image, extracting a hue image having a hue component from said extracted image and analyzing the hue image in its space frequency area. CONSTITUTION:The titled device is provided with a color converter 15 for converting a digital color image displayed by using the three primary colors into another color space, a hue extracting device 16 for separating and extracting the image converted into the color space in accordance with the hue to obtain a hue image, a rapid Fourier transfomer 17 for calculating the space frequency of the hue image, and a display device for displaying the space frequency. The image converted from the digital color image into another color space is extracted, the hue image having a hue component is extracted from said extracted image and the hue image is analyzed in its space frequency area. Thus, highly accurate image analysis can be attained.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to image processing used in the field of digital image processing, including, for example, medical image processing, industrial measurement image processing, and satellite image processing. Regarding analysis equipment.

(Prior Art) Generally, digital color images are produced using three primary colors, red (R) and green (G), on a CRT display.

Since color display is performed using the blue (B) signal, RlG, B
It is expressed by three R, G, and 8 images corresponding to . Therefore, as shown in FIG. 3, the conventional image analysis apparatus first processes digital color images 1 to 8 images 2. G11ii brass 3 and 8 images 4. This R11ii image 2, 0 image (I! 3 and 8 image 4 to Rii image profile 2a, G
Both meeting profile 3a and B image profile 4a were obtained and analyzed.

However, due to its configuration, the image analysis device described above can only analyze R, G, and B images 2 to 4 of the three primary colors because the digital color image 1 exists in the R, G, and B color space, and can only analyze the three primary colors of R, G, and B images 2 to 4. It was difficult to perform highly accurate analysis because it was not possible to evaluate the

Furthermore, this method also has the problem that only one-dimensional characteristics such as the profile of one line in one image can be grasped.

(Problems to be Solved by the Invention) As described above, conventional image analysis devices can only analyze images of three primary colors, making it difficult to perform highly accurate analysis.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an image analysis device that has a simple configuration and can improve analysis accuracy as much as possible.

[Structure of the Invention] (Means for Solving the Problems) The present invention includes a color conversion means for converting a digital image displayed in color using three primary colors into another color space, and an image converted into the color space. The present invention is characterized by comprising a hue extracting means for obtaining a hue image by separating and extracting according to the hue, a Fourier transform means for calculating a spatial frequency of the hue image, and a display means for displaying the spatial frequency.

(Operation) With the above configuration, an image converted into another color space is extracted from a color digital image, and a hue image having a hue component is extracted from the image and analyzed in its spatial frequency domain.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an image analysis device according to an embodiment of the present invention. In the figure, 10 is a central processing unit (CPLJ) to which a keyboard 11 and a display device 12 are connected. The CPU 10 includes an image input device 139 such as an industrial television camera, and an image memory 141.
Color conversion device 115. Hue extraction 11116 and fast Fourier transform! 117 are connected via the control bus 18,
These image input devices [13, image memory 149 color conversion device 151 hue extraction device 16 and fast Fourier transform device 1
7 are connected to each other via a high-speed image bus 19.

In the above configuration, when performing image analysis, first the keyboard 11 is operated, the CPU 10 is activated, and the R, G, B color image f is sent to the image input device 12 as shown in FIG.
Il! (Input image data) 20°21.22 is taken in. Then, this R,G.

The B color images 20 to 22 are transferred via the high-speed image bus 19 and stored in the image memory 14, and then input to the color conversion bag W115 via the high-speed image bus 19, and are converted into R, G,
An image 23 is obtained which is converted from the B color space to another color space having a hue image, for example, a hue-saturation-luminance color space. This image 23 is composed of a saturation image 24, a luminance image 11125, and a hue image 26, of which the hue image 26 representing the hue (tone) is transferred to the hue extraction device 16 via the high-speed image bus 19. This hue extraction device 16 extracts the hue image 2 from the hue image 2.
6 expresses the hue according to the level, the upper and lower limits are set at the hue of a predetermined level (the level of the hue to be analyzed), and the specified hue image 27 is extracted. Here, the brightness level of the specified hue image 27 corresponds to subtle differences in hue, and it is binarized with other hue images and sent again to the fast Fourier transform device ff17 via the high-speed image bus 19. be done. This fast Fourier transform device 2
117 performs a first-order fast Fourier transform 28 to transform into the spatial frequency domain, and its output is sent to the image memory 14 via the high-speed image bus 19 for storage. Here, the spatial frequency 29 is the control bus 18. The image is displayed on the display device 12 via CPLJlo, and the spatial frequency 29 of the designated color of the image is quantitatively observed.

In this way, the above image analysis@father-in-law extracts an image converted from a digital color image to another color space, extracts a hue image that has a hue component, and analyzes this hue image in the spatial frequency domain. As a result, more accurate image analysis can be achieved than in the conventional case where only 8 R, G, and 8 images are analyzed. According to this, for example, even in the case of a classified image in remote sensing image processing where a predetermined color of an input color image represents a certain meaning, it is possible to quantitatively understand the distribution density of colors in the image. Become.

Although the present invention has been described in the above embodiment using the CPLI 10 that controls the entire system including the image processing device, the present invention is not limited to this, and for example, a dedicated controller may be used to control the tilJt[ It is also possible to configure the system to perform 1.

Further, as the image memory 14, this is used as the color conversion device 1.
It is also possible to configure it so that it is built into the F.59 hue extraction device 16 and the fast Fourier transform device 17. moreover,
It is also possible to configure the keyboard 11 as a dedicated panel/instruction device.

Further, in the above embodiment, the fast Fourier transform 28 is configured to be performed in one dimension, but it is not limited to this, and it is also possible to analyze both vertical and horizontal spatial frequencies of the image as two dimensions. It is.

This invention is based on the conventional R image profile.

By using this function in combination with the function of determining and analyzing the G image profile and the B image profile, the accuracy of image analysis can be further improved and effective effects can be expected.

Therefore, it goes without saying that the present invention is not limited to the above embodiments, and that various modifications can be made without departing from the spirit of the invention.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide an image analysis device that has a simple configuration and can improve analysis accuracy as much as possible.

3. Detailed Description of the Invention Fig. 1 is a block diagram showing an image analysis device according to an embodiment of the invention, Fig. 2 is a diagram showing the algorithm of Fig. 1,
FIG. 3 is a diagram showing an algorithm of a conventional image processing device.

10...CPU, 11...Keyboard, 12...
Display device, 13... Image input device, 14...
- Image memory, 15... Color conversion device, 16... Hue extraction device, 17... Fast Fourier transform device, 18.
...Control bus, 19...High-speed image bus.

Claims (1)

[Claims] a color conversion means for converting a digital image displayed in color using three primary colors into another color space; a hue extraction means for obtaining a hue image by separating and extracting the image converted into the color space according to the hue; An image analysis device comprising: a Fourier transform means for calculating a spatial frequency of a hue image; and a display means for displaying the spatial frequency.