JPH0258180A - Picture processing method - Google Patents

Abstract

PURPOSE:To freely and easily set an area reflecting the spade filter processing result by masking the processing result with a mask whose shape is freely set by an operator. CONSTITUTION:The mean value of each picture element and picture elements around it in a processing object area is found and the picture element value of the picture element is substituted with the mean value, thereby performing the space filter processing. The mask setting step where the mask having a desired shape is set by operator's instruction and the mask processing step where the space filter processing result is masked by the set mask are provided. Thus, the shape of the area reflecting the processing result is freely and easily designated and set.

Description

[Detailed description of the invention] [Table of contents] Overview Industrial field of application Prior art (Figure 4) Means for solving the problem to be solved by the invention (Figure 1) Working example (a) 1 Description of embodiments (Figs. 2 and 3) (b) Description of other embodiments Effects of the invention [Summary] Regarding an image processing method in which an original image is subjected to spatial filter processing, the shape of the processing result reflection area can be freely and easily changed. In an image processing method that performs spatial filtering for each pixel in a processing target area, taking the average value of the surrounding pixels and replacing the pixel value of the pixel with the average value. , a mask setting step for setting a mask of a desired shape in response to an operator's instruction, and a mask processing step for masking the result of the spatial filter processing using the set mask.

It is.

[Industrial application field]

The present invention relates to an image processing method that performs spatial filter processing on an original image.

With the advancement of graphic processing, various types of image processing are required.

For example, airbrush processing of an image is a process that blurs or blurs the outline of the image, as if it were painted with a spray paint, and spatial filter processing is generally used.

In spatial filter processing, if the coordinates for which a processing request is made are in a processable area, the individual pixel values of nXn, which is the processing target area, are averaged in mXm around the coordinates, and the average value is calculated. Process the image of the processing target area with the processing size n
This is to replace Xn by a rectangle.

Although it is possible to manipulate the contours of an image through such spatial filter processing, it is required to reflect the processing results in any other arbitrary shape rather than a rectangle. [Prior art] Figure 4 shows a conventional technology. FIG.

As shown in FIG. 4(A), a tablet (coordinate human power device) ■ is connected to the host computer 2 as an input means,
In an image processing system in which an image control device 3 and an image display device 5 are connected to a host computer 2, image information for 1iii pages is stored in a memory 5a in the image display device 5 and displayed.

The operator inputs airbrush processing information (processing center coordinates, processing target area, spatial filter area) to the host computer 2 from the tablet 1 while viewing the image on the screen of the image display device 5 .

The host computer 2 thereby passes control to the image control device 3, and the image control device 3 determines whether the image to be processed is a processable area or an unprocessable area based on mask information set for the screen in advance. judge.

If the manually input pixel is within the processable area, the arithmetic processing unit 4 processes the pixel in the processing target area nXn and the area m (=3)Xm of the spatial filter centered on this pixel.
(=3) pixels are read from the memory 5a.

The arithmetic processing unit 4 performs the following spatial filtering process only on the 3×3 pixel values aij centered on each pixel in the processing target area, which are within the processable area.

That is, as shown in FIGS. 4(B) and 4(C), the average value of 3×3 pixels is taken and replaced as the pixel value of the center pixel.

If this is done for all pixels in the processable area and displayed on the image display device 5, an image in which the periphery of the pixel for which a processing request has been made is blurred (airbrush processed) is obtained.

[Problem to be solved by the invention]

In such conventional image processing using a spatial filter, the processing target area has the same size as the processing result reflection area.

That is, the processing target area is specified as a rectangle, and since the processing target area and the processing result reflection area are the same, the processing result reflection area cannot take any shape other than a rectangle.

Incidentally, depending on the purpose of image processing, there are cases in which it is desired to obtain not only processing results for all of the processing target area, but also processing results for a specific area in the processing target area.

For example, in graphic processing, if a rectangular processing target area is specified and spatial filter processing results of a specific image, shape, etc. within the area can be obtained, an extremely wide variety of image processing becomes possible.

Conventionally, there has been a problem that the processing result reflection area cannot be formed into a free shape.

Therefore, an object of the present invention is to provide an image processing method that allows the shape of a processing result reflection area to be freely and easily set.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

As shown in FIG. 1, the present invention performs spatial filter processing for each pixel in a processing target area by taking the average value of its surrounding pixels and replacing the pixel value of the pixel with the average value. The image processing method includes a mask setting step of setting a mask of a desired shape according to an operator's instruction, and a mask processing step of masking the result of the spatial filtering process using the set mask.

[Effect]

In the present invention, a mask of the same size as the processing size is prepared, the operator can freely set the shape of the mask, and by masking the set mask and the spatial filter processing results, the shape of the processing result reflection area is can be freely and easily specified and set.

〔Example〕

(a) Description of one embodiment FIG. 2 is a detailed explanatory diagram of the present invention.

In FIG. 2(A), the same components as those shown in FIGS. 1 and 4 are indicated by the same symbols, and 4a is a microprocessor (MPU) that controls the entire image control device 3. It also exchanges data with the image display device 5.

Note that the arithmetic processing unit 4 is a digital signal processor (D
SP) and performs spatial filter processing and mask processing.

FIG. 3 is a processing flow diagram of one embodiment of the present invention.

(2) In this embodiment, first, a mask creation command is issued from the tablet 1 to create a mask.

When a mask creation command and a mask area are input from the tablet 1 to the host computer 2, the host computer 2 instructs the MPU 4a to display the mask area on the screen of the screen display device 5.

While looking at the screen, the operator inputs and embeds "1" (writable) and "0 (writable)" into each pixel of the mask area using the tablet 1, thereby completing the mask.

This mask is stored in a memory (not shown) within the arithmetic and control unit 3.

FIG. 2(C) shows an example of this created mask, and Y
The area shaped like a square is set to be writable.

Furthermore, from the tablet 1, processing requested pixel coordinates, processing target area nXn, and average target pixel processing size mXm (3x
3) is done manually.

This allows the image control device 3 to be accessed from the host computer 2.
control is passed to

In the image control device 3, under the control of the MPU 4a, the arithmetic processing unit (hereinafter referred to as DSP) 4 reads from the memory 5a of the image display device 5 the pixels in the processing target area n 3x3 with each pixel at the center
Read pixels in the range.

(2) The DSP 4 calculates the pixel value of the center pixel of 3×3 using the above-mentioned formula.

■ Next, the DSP 4 reads the contents of the corresponding pixels of the mask stored in the memory (not shown), and the contents (specified value) are “
If it is 1°, write the calculation result to the memory work area.

Furthermore, the respective addresses of the processing target area, mask area, and averaging target area are updated in the raster scan direction.

(2) Next, the DSP 4 determines from the address of the processing target area whether all calculations in the processing target area have been completed, and if not, returning to step (2).

(2) When all calculations on the processing target area are completed in this way, the processing target area becomes as shown in FIG. 2(B).

In Fig. 2(b), ■ is a pixel corresponding to the processing request coordinates, an inverted triangle "" is the processing target area n x n, and a double circle "◎J" is one center when calculating the average. Yes, rose
×” is the target region mXm when calculating the average centering on “◎”, and the circle mark “○” is the region to be referred to when processing the processing target region.

The dot "・" is an area that is not related to the processing request from ■,
The black circle "." is the processing reflection area (mask result).

Therefore, in the work area of the memory, the processing results masked by the mask shown in FIG. 2(B) are written in an area of nXn.

After this calculation is completed, control is passed from the DSP 4 to the MPU 4a.

By passing the contents of nXn in the work area of this memory to the memory 5a of the image display device 5, the MPU 4a
An image is obtained in which the periphery of the pixel displayed on the screen and for which a processing request has been made is blurred (airbrushed) into the specified shape.

Furthermore, since this mask operates around the coordinates specified by the pointing device, which is the tablet left 1, it follows the pointing device and is effective for subsequent processing requests.

In this way, the spatial filter has a shape mask,
By masking the results of spatial filtering using a shape mask, spatial filtering can be performed in any shape desired by the operator, making it possible to perform image processing with wider versatility.

(b) Description of other embodiments In the embodiments described above, the spatial filter was constructed of 3×3, but it may be of other sizes, and the shape of the mask may also be Y.
Not limited to letters, various shapes such as circles can be applied.

Although the present invention has been described above using examples, the present invention can be modified in various ways according to the gist of the present invention, and these are not excluded from the present invention.

〔Effect of the invention〕

As explained above, according to the present invention, a shape mask is prepared, the operator can freely set the shape of the mask, and the spatial filter processing results are masked with this mask, so the processing result reflection area can be freely set. Moreover, it has the effect of being easy to set, and greatly contributes to the diversification of image processing.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a detailed explanatory diagram of the present invention, FIG. 3 is a processing flow diagram of an embodiment of the present invention, and FIG. 4 is an explanatory diagram of the prior art. In the figure, ■-tablet, 2-host computer, 3-image control device, 4-image display device.

Claims (1)

[Claims] (1) In an image processing method that performs spatial filter processing in which each pixel in a processing target area is averaged with its surrounding pixels, and the pixel value of the pixel is replaced with the average value, according to an operator's instructions, An image processing method comprising: a mask setting step of setting a mask having a desired shape; and a mask processing step of masking the result of the spatial filtering process using the set mask.