JP2808590B2 - Image data processing device - Google Patents

Description

The present invention relates to an image data processing device that processes image data. [Prior Art] Conventionally, in a personal computer equipped with an image scanner, when an image such as a photograph or an illustration is read from the image scanner, unnecessary dust or paper folds or the like below the image to be read are also collected. Will be read. In such a case, as shown in Fig. 8, select the "Erase" item from the processing menu displayed on the CRT screen, and then point the mouse on the erase area (the part enclosed by the chain line in the figure). By designating using a device, dust data within the range is erased. [Problems to be Solved by the Invention] However, erasing data while specifying the data to be erased one by one is extremely poor in operability, and there is a possibility that a necessary portion may be erased by mistake. An object of the present invention is to enable reliable processing when unnecessary image data is deleted from image data. [Means for Solving the Problems] According to the present invention, an image data processing device includes: an image data storage unit that stores image data; and a determination filter that determines a dust image based on image data. Each time the area changing means and the determination area changing means change the determination area, dust image data included in the image data stored in the image data storage means is determined using a determination filter in which the determination area has been changed. It is characterized by having a determining means and an erasing means for erasing the dust image data determined by the determining means. Embodiment An embodiment will be described below with reference to FIGS. 1 to 6. This embodiment shows an example applied to a personal computer. 1. Configuration FIG. 1 is a block circuit diagram showing a basic configuration of the personal computer. In this embodiment, in addition to the keyboard 11, a mouse as a pointing device serves as external input means of the personal computer.
12.Image scanner 1 composed of CCD image sensor
Three are provided. And keyboard 11, mouse 12
Is input to the CPU 16 via the corresponding keyboard control unit 14 and mouse control unit 15. The CPU 16 writes the document data input from the keyboard 11 and the cursor position data input from the keyboard 11 or the mouse 12 into the CRT buffer 17, and the CRT control unit 18
The data in the CRT buffer 17 is sent to the CRT display device 19 for display. Further, the CPU 16 gives an operation command to the image control unit 20, and the image control unit 20 writes the image data read by the image scanner 13 into the image buffer 21, and writes the data in the image buffer 21 into the CRT buffer 1.
Send to 7. Further, the CPU 16 operates the dust image removing unit 22, and the dust image removing unit 22 searches for dust data from the image data in the image buffer 21, and deletes it. In this case, the dust image removing unit 22
In addition to the x, y, X, Y registers and cnt counter, the dust elimination processing is performed using a conceptually existing dust discrimination filter (see FIG. 2). Note that x, y,
The X and Y registers store the coordinate positions of the image buffer 21, and the cnt counter counts the number of dust erasing processes. As shown in FIG. 2, the dust discrimination filter DF has an erasing area CL at the center and an isolated point judgment area IP around the erasing area CL.
These areas CL and IP do not actually exist but are conceptually specified areas. The erasure area CL is the horizontal cnt dot vertical cnt specified by the value “cnt” of the cnt counter.
In the square area of the dots, the dots contained therein are erased as dust data. The erasing area CL is a variable area that changes every time the value of the cnt counter is updated as “1,” “2,” “3,”. The above-mentioned isolated point determination area IP is an annular area having a width of cons dots from the end of the erasing area CL.
A dot in the CL is determined as an isolated point. The isolated point determination area IP is a fixed area (invariant area) specified by a cons dot (constant). In the present embodiment, the cons dots have a 32-dot configuration. Operation First, from the processing menu (see FIG. 3A) displayed on the CRT display device 19, an item of "image read" is selected by the keyboard 11 or the mouse 12. FIG. 3A shows a case where the item is selected by a mouse cursor. When the item “image read” is selected in this manner, the CPU 16 gives an operation command to the image control unit 20.
Then, the image control unit 20 receives the image data read from the image scanner 13 and sends the image data to the image buffer.
Then, the image data is written into the CRT buffer 17. The cnt counter in the CPU 16 is cleared by such image data reading processing. Thus, the CRT control unit 18 causes the CRT display device 19 to display the image data in the CRT buffer 17. Fig. 3 (B)
Indicates the display status at this time, visually inspects the display contents, and after confirming that dust data is included in addition to the original image data, selects the "Delete" item from the processing menu using the keyboard 11 or mouse 12. I do. Then, CP
U16 gives an operation command to the dust image removing unit 22, and the dust image removing unit 22 executes the dust erasing process according to the flowchart of FIG. First, an increment process is performed in which the value of a cnt counter for counting how many times the dust erasing process has been performed on the same image data in the image buffer 21 is increased by "1" (step S1). Then, from the total number of dots in the horizontal direction and the total number of dots in the vertical direction of the image buffer 21 to cons dots (32 dots).
The value obtained by adding the cnt dot (first one dot) is subtracted, and the value is set in the X and Y registers (step S).
2). That is, as shown in FIG.
It is assumed that the dust determination filter DF moves from top to bottom by one dot while moving from left to right in the horizontal direction.
Then, as shown in FIG. 5, when the erasure area CL of the dust determination filter DF is at the upper left position of the image buffer 21 as the start position and at the lower right position as the end position, the values of the X and Y registers are as follows. At the end position, the XY coordinates of the origin (upper left of the isolated point determination area) of the dust determination filter DF are used. The image buffer 21 stores the image data in a bit array of "0" and "1", and the circle in FIG. 5 indicates the storage state. After obtaining the end position coordinates with respect to the origin of the dust determination filter DF in this way, "-cnns dot (-32 dot)" is set in the y register (step S3). That is, the origin y coordinate of the dust determination filter DF at the start position is set in the y register. Then, the value of the Y register is compared with the value of the y register to check whether the dust erasing process has been completed up to the end position of the image buffer 21 (step S4). Since the value of the y register is at the start position, the flow advances to step S5 to set "-cons dot" in the x register. As a result, the origin x coordinate of the dust determination filter DF at the start position is set in the x register. Then, the process proceeds to step S6, where the value of the X register is compared with the value of the x register to check whether the dust erasing process for one line in the horizontal direction of the image buffer 21 has been completed. Since the value of the x register is at the start position, the process proceeds to step S7. Here, the isolated point determination area IP of the dust determination filter DF
It is checked whether or not dot data exists in the area. As a result, if there is data (step S8), the data in the erasure area CL is not set as an isolated point apart from the set of other dots, but if there is no data in the isolated point determination area IP, the erasure area CL
Are determined as isolated points. That is, FIG. 6 shows the determination state in this case, and FIG. 6 (A) shows the former case and FIG. 6 (B) shows the latter case. If it is determined that the data in the erasure area CL is not an isolated point, step
Proceeding to S9, "1 dot" is added to the value of the x register, and the process returns to step S6. If it is determined that the data is an isolated point, the process proceeds to step S10, where all data in the erasure area CL is cleared. In this case, the size of the erase area CL is 1 × 1
Dots, and thus isolated points of 1 × 1 dot size, are erased as dust images. Thereafter, a value obtained by adding the cnt dot and the cons dot to the value of the x register is added, and the result is set in the x register (step S11). That is, in this case, the isolated point determination area IP
In such a case, the value of the x register is updated not by "1 dot" but by "cnt dot + cons dot" in such a case, and then the process returns to step S6. Therefore, the dust erasing process as described above is performed in the horizontal direction for one time.
When the process is completed for the line, this is detected in step S6, the process proceeds to step S12, and "1 dot" is added to the value of the y register, and then the process returns to step S4. As a result, the dust determination filter DF starts a new line, and shifts to dust erasing processing for the next line. In this manner, the dust erasing process is executed line by line, and when the origin y coordinate of the dust determination filter DF exceeds the end position (Y coordinate position) of the image buffer 21, ie, the entire area of the image buffer 21 When the dust elimination process for is completed, it is detected in step S4,
Exit from this flow. Thereby, the data in the image buffer 21 is sent to the CRT buffer 17 via the image control unit 20, and the CRT control unit 18 displays the data in the CRT buffer 17 on the CRT display device 19. FIG. 3 (C) shows a display state after the first dust erasing process is completed, and 1 × 1 by the first dust erasing process from among three types of isolated points, large, medium and small, shown in FIG. 3 (B).
A dot-sized isolated point is erased as a dust image, but a larger medium-sized isolated point is not erased, remains in the image buffer 21 as it is, and is displayed on the CRT display device 19. In this state, if you select further dust elimination processing,
The dust erasing process shown in FIG. 4 is executed again. In this case, the value of the cnt counter is incremented to “2” by the second dust erasing process, and as a result, the erasing area CL of the dust determination filter DF is enlarged to 2 × 2 dots.
An isolated point having a size of × 2 dots is treated as dust and erased, but an isolated point larger than that remains (see FIG. 3 (D)). Next, by the third selection of the dust erasing menu
As a result of the value of the cnt counter becoming “3”, the erasure area CL of the dust determination filter DF is enlarged to 3 × 3 dots and 3 × 3
A dot-sized isolated point is treated as dust and erased. Thereafter, similarly, every time the dust erasure processing menu is selected, a large isolated point is gradually treated as dust and erased. Modified Application Example (1) In the above embodiment, the erasing area CL of the dust determination filter DF is gradually increased every time the dust erasing processing menu is selected, and 1 × 1 dot, 2 × 2 dots, 3 × 3 dots... Are treated as dust, but all the isolated points, for example, 5 × 5 dots or less, may be erased as dust from the beginning. (2) The present invention is applicable not only to a personal computer but also to a word processor with an image reader. [Effects of the Invention] According to the present invention, when erasing unnecessary dust image data, the dust image is determined using the filter every time the determination area of the determination filter is changed, and the dust image is deleted. An effect is obtained that dust images of any size can be easily and reliably erased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 6 show an embodiment of the present invention, FIG. 1 is a block circuit diagram of a personal computer to which the present invention is applied, and FIG. FIG. 3 is a view for explaining a judgment filter, FIG. 3 is a display state diagram showing a process of erasing a dust image, FIG. 4 is a flowchart showing a dust erasing process, and FIG. FIG. 6 is a diagram showing a moving range when moving on an image buffer, FIG. 6 is a diagram showing a specific example for explaining a judgment state of a dust judgment filter, and FIG. 7 is a diagram for explaining a conventional example. . 13 ... Image scanner, 16 ... CPU, 20 ... Image control unit, 21 ... Image buffer, 22 ... Dust image removal unit.

Claims (1)

(57) [Claims] Image data storage means for storing image data; determination area changing means for changing a determination area of a determination filter for determining a dust image from image data; and each time the determination area changing means changes the determination area, the determination area is changed. A determination unit that determines dust image data included in the image data stored in the image data storage unit using the changed determination filter; and an erasing unit that erases the dust image data determined by the determination unit. Image data processing device.