JPS60153565A - Method for forming characteristic curve in picture processing - Google Patents

Abstract

PURPOSE:To designate also fine change easily in a short time by forming an original characteristic curve for determining a picture characteristic through a screen of a display device and Fourier transforming the formed curve to form a characteristic curve in a real space. CONSTITUTION:In case of the formation of a characteristic curve, a starting point is set up at first then an input device 12 is operated to input pattern data. Subsequently, an original characteristic curve 3 is displayed on a CRT16 in accordance with the input data. While observing the curve 3 displayed on the CRT16, the operator 11 executes required inspection and judges whether correction is necessary or not. If correction is necessary, the displayed screen is erased, the starting point is set up again and similar operation is repeated so that the input data becomes the original characteristic curve 3 having required processing characteristics. The data of the curve 3 are Fourier transformed by a CPU14 through a storage device 15 to form the characteristic curve of the picture processing in the real space. Thus, fine change also can be designated in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Application of the Invention The present invention relates to the development of characteristic curves in image processing that enhances images by clarifying the contours of medical images such as X-ray CT equipment and satellite images sent from artificial satellites. The present invention relates to a creation method, and particularly to a method for creating characteristic curves in image processing that can easily specify even minute changes in a short time.

Prior Art and Problems In image processing to clarify the contours of medical images, satellite images, etc. and enhance the image, the original image is divided into pixels,
A plurality of segmentation units of the same size as this pixel are nested together to form one block, and for example, the center part is "1" and the surrounding part is "-α".
5'', create a characteristic curve with processing characteristics, apply a filter to each pixel of the original image, shift it pixel by pixel, and in this way, calculate the processing characteristics for all pixels of the original image. Filter processing is applied to remove blur in the peripheral areas.

In such image processing, the above-mentioned characteristic curves have been created using conventional methods. Now, as shown in Figure 1 (a), a sine wave 1 with a different frequency f
It is assumed that the origin curve 3 having the desired characteristics is created by superimposing and 2. In this case, when the formula representing sine wave 1 and the formula representing sine wave 2 are input into an electronic computer, and the central processing unit calculates the sum of the two formulas, the result is the original characteristic song #3. This is a mathematical expression that represents This is Fourier-transformed by the central processing unit, and as shown in Figure 1(b), the characteristics in real space can be expressed by the length axis 4 corresponding to the pixels of the image and the axis 5 representing the magnitude of the processing characteristics. I was on curve 6. However, in this case, several formulas for sine waves that would give the desired characteristics are input into an electronic computer, added up, and Fourier transformed each time to obtain the characteristic curve in real space.
Therefore, in order to finally obtain the characteristic curve 6 having the desired processing characteristics, the trial-and-error operation described above had to be repeated, which took a lot of time. Also,
As shown in FIG. 1(a), regarding the joining portion 7 of sine waves 1 and 2, it is not possible to predict the joining state just by looking at the mathematical formulas of the respective sine waves 1 and 2. It is extremely difficult to specify that the connecting portion 7 changes minutely and continues smoothly.

OBJECTS OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method for creating characteristic curves in image processing that can easily specify even minute changes in a short time.

SUMMARY OF THE INVENTION According to the present invention, graphic data consisting of a time function that can be expressed as a superposition of sine waves of different frequencies is inputted to an input device of an electronic computer, and a storage device is stored in accordance with instructions from the input device. The data corresponding to the above-mentioned graphical data stored in the computer is read out, and the originality curve that determines the characteristics of image processing is displayed on the screen of the display device. Image processing characterized in that after checking and correcting the originality curve, the data of the originality curve is written into a storage device, and then a central processing unit performs a Fourier transform based on the data to obtain a characteristic curve in real space. This is achieved by providing a characteristic curve creation method.

Embodiments of the Invention Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 2, an operator 11 first uses an input device 12 such as a two-dimensional trackball of an electronic computer to
Input graphic data that provides the desired processing characteristics as shown in the figure (,).

At this time, the signal S1 from the input device 12 reaches the central processing unit 14 through the path line 13, and the storage device 15 reads data corresponding to the graphic data according to the command S2 from the central processing unit 14. Then, the image is displayed two-dimensionally on the screen of a display device 16 such as a CR'r display.

At this time, since the above processing is executed in real time, the operator 11, while looking at the screen of the display device 16, generates sine waves of different frequencies f as shown in FIG. 1(a).
Figure data can be entered by adjusting K so that 2 and 2 are appropriately overlapped. Then, the operator 11 inputs the graphic data while visually confirming whether or not the currently input graphic data corresponds to the domicile curve 3 having the desired processing characteristics as shown in FIG. 1(a). If it is determined that the processing characteristics are not the desired ones, the input device 12 erases the locus of the graphic data that has been input so far and creates the originality curve 3 having the desired processing characteristics.
Operate to re-enter the shape data. Once the originality curve 3 is created in this way, the data is written into the storage device 15, and based on this data, the central processing unit 14 performs a Fourier transform to create a shape in real space as shown in FIG. 1(b). A characteristic curve 6 is obtained.

Next, a characteristic curve creation method according to the present invention will be explained with reference to the flowchart shown in FIG.

First, a command is given to set a starting point and input the graphic data of the origin curve (A).

Next, input the graphic data by operating the input device 12, read out the data corresponding to the input data, and display the domicile curve 3 on the display device 16 in real time (B
,C). While looking at the original property curve displayed on the display device 16, the operator 11 determines that the magnitude of the function value of the time function of the sine waves 1, 2, etc. with respect to the frequency axis shown in FIG. 1(a) has the desired processing characteristics. Check whether it gives the following information and decide whether correction is required (D). If correction is required, proceed to the S YES tt side and erase all the loci of the original physical property curves that have been displayed so far (E). At this time, return to the first step 9 and set the starting point again (A).

Thereafter, steps B, C, and D are repeated in the same manner as above so that the input graphic data becomes an original physical property curve having desired processing characteristics.

If it is determined in the above steps that no correction is necessary, the process proceeds to the %NO1 side, and in step F of the next end point set, proceeds to the -NOI side, returns to before step B, and continues inputting graphic data. Like this B, C, D, F
Repeat the steps and when you reach the end point of the locus of the original physical property curve, proceed to the %YES ' side and set the end point (
F).

As a result, an original property curve 3 having desired processing characteristics as shown in FIG. 1(a) is created.

Here, the data of this original physical property curve 3 is written into the storage device 15, and based on this data, the central processing unit 14 performs a Fourier transform (G). As a result, a characteristic surface #6 of image processing in real space is created, as shown in FIG. 1(b), represented by a length axis 4 corresponding to the pixel density of the image and an axis 5 representing the magnitude of the processing characteristic. (■]).

Note that although a two-dimensional trackball is shown as the input device 12 in FIG. 2, the present invention is not limited to this, and input may be made using a light ben.

Effects of the Invention As explained above, the present invention consists of a time function that can be expressed by superimposing sine waves of different frequencies. After inputting graphic data while looking at the screen of the display device 16 and creating an original physical property curve 3 that determines image processing characteristics while inspecting and correcting whether it has the desired processing characteristics each time, the original physical property curve 3 is Since the characteristic curve 6 in the real space is created by Fourier transform based on the data, an image processing characteristic curve having desired processing characteristics can be created by performing 7-times of Fourier transform. Therefore, it can be created easily and in a short time without repeating the conventional trial and error operation. In addition, since the original physical property curve 3 is created while viewing the actual trajectory on the screen of the display device 16, when sine waves of different frequencies are superimposed, it is possible to easily specify minute changes at the joining part. Original physical property curve 3 that continues with a smooth trajectory
'fc can be created.

[Brief explanation of the drawings] Figure 1 (a) is a graph showing the original physical property curve, Figure 1 (b)
is a graph showing a characteristic curve of image processing in real space, FIG. 2 is a block diagram of a device used to implement the characteristic curve creation method according to the present invention, and FIG. 3 is a flowchart showing the characteristic curve creation method according to the present invention. . 1.2... Sine wave, 3... Original property curve, 6... Characteristic curve in real space, 12... Input device, 14... Central processing unit, 15
...Storage device, 16...Display device. Figure 1 Figure 2

Claims (1)

[Claims] Graphical data consisting of a time function that can be expressed as a superposition of sine waves of different frequencies is input using the input device of an electronic computer, and is stored in the storage device using the signal from this input device.
The data corresponding to the above-mentioned graphical data stored is displayed on the screen of the display device to display the originality curve that determines the characteristics of the image processing. After checking and correcting whether or not the originality curve is present, the data of the originality curve is written into a storage device, and then a central processing unit performs a Fourier transform based on the data to obtain a characteristic curve in real space. A method for creating characteristic curves in image processing.