KR100765285B1 - Apparatus and method for compensating image - Google Patents

Abstract

An image correction apparatus and method are disclosed. When storing an original image consisting of image data of M rows x N columns, the apparatus horizontally shifts the image data read from the conversion storage unit and the conversion storage unit which inverts and stores the image data left and right across at least one row. And a micro scanning mirror for scanning in the direction. Therefore, while scanning the image data using the micro scanning mirror, it does not reduce the brightness of the screen.

MEMS, scanning

Description

Apparatus and method for compensating image}

1 is a general and schematic block diagram of an imaging apparatus for scanning an image using a micro scanning mirror.

2 is a block diagram of an embodiment of an image correction device according to the present invention.

3 is a flowchart illustrating an embodiment of an image correction method according to the present invention.

4 (a) to 4 (c) are exemplary diagrams for explaining the operation of each part of the apparatus shown in FIG.

5 is a general timing diagram of a VESA monitor.

6 is a flowchart for explaining another embodiment of an image correction method according to the present invention.

7 (a) to (c) are exemplary diagrams for explaining the operation of each part of the apparatus shown in FIG.

The present invention relates to the field of using a micro scanning mirror, and more particularly, to an image correction apparatus and method for correcting an image when scanning an image using the micro scanning mirror.

Recently, a display system using a MEMS (Micro Electro Mechanical System) mirror to scan a desired image and using a laser as a light source has been developed. Hereinafter, the MEMS mirror used for scanning is referred to as a 'micro scanning mirror'.

A two-dimensional screen can be constructed by using a laser as a light source and scanning the laser beam by a micro scanning mirror. If the laser beam is scanned on the screen using an electron gun as in a cathode ray tube (CRT), scanning can be controlled by a desired movement. However, since the micro scanning mirror must be driven using the resonance mode, the micro scanning mirror simply reciprocates during the scanning operation.

In the case of the horizontal image scanning in the CRT method, the scanning operation is performed from left to right and then quickly returns from right to left again, and then again from left to right. However, when scanning the horizontal image using the micro scanning mirror, the micro scanning mirror must be reciprocated in the resonance mode, so that the speed of scanning from left to right and the speed of returning from right to left are the same. Therefore, as in the conventional CRT, when the micro scanning mirror scans only from left to right and does not scan an image signal when it returns from right to left, there is a problem of lowering the brightness of the image.

In addition, in the case of vertical image scanning in the CRT method, after scanning from the top to the bottom, and then again from the bottom to the top at a high speed, the scanning operation is performed from the top to the bottom again. However, when scanning the vertical image using the micro scanning mirror, the micro scanning mirror must be reciprocated in the resonance mode, so that the speed of scanning from the top to the bottom is equal to the speed of returning from the bottom to the top. Therefore, as in the conventional CRT, when the micro scanning mirror scans only from the top to the bottom and does not scan the image signal when the bottom to the top, there is a problem of lowering the brightness of the image.

An object of the present invention is to provide an image correction device and method for correcting the brightness of an image that may be degraded when scanning an image using a micro scanning mirror.

An image correction apparatus according to the present invention for achieving the above object, when storing the original image consisting of image data of the size M rows × N columns, the conversion storage unit for storing the image data inverted left and right across at least one row And a micro scanning mirror that scans the image data read out from the conversion storage in the horizontal direction.

Or, the image correction device, when storing the original image consisting of image data of M rows × N columns, the conversion storage unit for storing a symmetric image symmetrically perpendicular to the original image with the original image and the It is preferable that the micro scanning mirror is configured to scan the image data read out from the conversion storage in the vertical direction.

An image correction method according to the present invention, which is performed in an image correction apparatus that scans image data using a micro-scanning mirror, crosses at least one row when storing an original image consisting of image data of M rows × N columns. Preferably, the image data is inverted and stored in a horizontal direction, and the stored image data is scanned in a horizontal direction.

Alternatively, an image correction method according to the present invention, which is performed in an image correction apparatus that scans image data by using a micro scanning mirror, is used when storing an original image composed of image data of M rows × N columns. And storing the symmetrical image symmetrically in the vertical direction together with the original image and scanning the stored image data in the vertical direction.

Prior to describing the image correction device according to the present invention, an example in which a micro scan mirror is used will be described with reference to the accompanying drawings.

FIG. 1 is a general and schematic block diagram of an imaging apparatus for scanning an image using a micro scanning mirror, and includes a video signal processor 10, a light source 12, a micro scanning mirror 14, and a screen 16. .

The video signal processor 10 shown in FIG. 1 processes the video signal input through the input terminal IN1 and outputs the processed result to the light source 12 as a control signal. At this time, the light source 12 outputs the corresponding light to the micro scanning mirror 14 in response to the control signal input from the video signal processor 10. At this time, when the laser is used as the light source 12, the laser beam can be reflected from the light source 12 through the micro-scanning mirror 14 and scanned on the screen 16.

Hereinafter, a configuration and an operation of an embodiment of an image correction apparatus according to the present invention and an image correction method performed in the apparatus will be described with reference to the accompanying drawings.

FIG. 2 is a block diagram of an embodiment of an image correction apparatus according to the present invention, and includes a conversion storage unit 30, a storage control unit 32, and a micro scanning mirror 34. As shown in FIG.

3 is a flowchart illustrating an embodiment of an image correction method according to an embodiment of the present invention, in which the image data of a row is inverted from one row to the left in a source image (step 50), and the image data is read. Step 52 (step 52) and scanning of image data (step 54).

According to the present invention, first, the conversion storage unit 30 inputs and stores an original image consisting of image data of M rows x N columns through the input terminal IN2 (step 50). In operation 50, when storing image data, the conversion storage unit 30 inverts the image data left and right across at least one row and stores the image data inverted left and right. For example, the conversion storage unit 30 may invert image data left and right across a plurality of rows, or may invert image data left and right across a single row.

If the conversion storage unit 30 reverses the image data left and right across one row, when the conversion storage unit 30 stores the original image, the conversion storage unit 30 stores the image data of even-numbered rows. You can store them in reverse. Alternatively, according to another embodiment of the present invention, when storing the original image, the conversion storage unit 30 may invert and store the image data of the odd-numbered rows.

4 (a) to 4 (c) are exemplary diagrams for explaining the operation of each part of the apparatus shown in FIG. 2, and FIG. 4 (a) shows an exemplary view of an original image input through the input terminal IN2. 4 (b) shows an exemplary view of an original image converted and stored in the conversion storage unit 30, and FIG. 4 (c) shows an exemplary view of the scanned image.

For example, when M = 4 and N = 6, the conversion storage unit 30 may input and store the original image as shown in FIG. 4A through the input terminal IN2. In this case, the conversion storage unit 30 may invert and store the image data of the even-numbered rows 60 and 62 as shown in FIG. 4B.

On the other hand, after step 50, the storage control unit 32 reads the image data of the m (1≤m≤M) th row stored in the conversion storage unit 30 from the left to the right and then the image of the m + 1th row Data are read from the left to the right into the micro scanning mirror 34 (step 52). Further, the storage control unit 32 reads the image data of the m + 1st row stored in the conversion storage unit 30 from the right side to the left side, and then reads the image data of the m + 2th row from the right side to the left side with a micro scanning mirror ( Read out 34). In this way, the storage control unit 32 reads image data from the left to the right in the horizontal direction with the micro scanning mirror 34. Alternatively, the storage control unit 32 may read image data from the right to the left in the horizontal direction with the micro scanning mirror 34.

For example, the storage control unit 32 reads the image data of the first row from the left to the right as shown in FIG. 4 (b), and then stores the image data of the second row 60 from the left to the right from the micro. Read by the scanning mirror 34. At this time, the storage control unit 32 reads the image data of the second row 60 shown in FIG. 4 (b) from the left to the right and then the image data of the third row from the left to the right from a micro scanning mirror ( Read out 34). In addition, the storage control unit 32 reads the image data of the third row shown in FIG. 4B from the left to the right side, and then reads the image data of the fourth row 62 from the left to the right from the micro scanning mirror 34. Read).

After the 52 th step, the micro scanning mirror 34 scans the image data read out from the conversion storage unit 30 under the control of the storage controller 32 in the horizontal direction (step 54). For example, when the original image stored in the conversion storage unit 30 is read out under the control of the storage control unit 32 as described above, as shown in FIG. 4 (b), the micro scanning mirror 34 is shown in FIG. 4. As shown in (c), after sequentially scanning the image data '1', '2', '3', '4', '5' and '6' in the first row in the direction of arrow ①, The image data '6', '5', '4', '3', '2', and '1' of the second row may be sequentially scanned in the direction of arrow ②. Thus, according to the present invention, since the image data of the m-th row can be scanned from the right to the left after the image data of the m-th row is scanned from the left to the right, the brightness of the image is not lowered.

5 is a general timing diagram of a VESA monitor, which is composed of an active video section (“Active” Video) and a blanking section (Blanking).

In the case of scanning using a conventional CRT, an image is scanned from left to right in the active video section, and returned from right to left during the blanking section. However, when using the micro-scanning mirror 34, the length of the active video section and the length of the blanking section are the same as shown in FIG. Therefore, according to the present invention, image data of the m-th row may be scanned from left to right in the active video section, and m + 1th image data may be continuously scanned from right to left in the blanking section. That is, image data stored in the conversion storage unit 30 after being inverted left and right are read out under the control of the storage control unit 32 and scanned through the micro scanning mirror 34 in the blanking period.

The image correction apparatus and method according to the present invention scan the image data using the micro scanning mirror 34 in the horizontal direction as described above. However, the present invention is not limited thereto and may be implemented differently from that shown in FIG. That is, as long as the image data of a row can be scanned from left to right and then the image data of the next row can be continuously scanned from right to left without interruption, the image correction apparatus according to the present invention shown in FIG. 32 may not be provided. In this case, the image correction method illustrated in FIG. 3 does not provide a 52nd step. Alternatively, as long as the image data of one row can be scanned continuously from left to right after the image data of right row is left, the image correction device according to the present invention shown in FIG. 32 may not be provided. In this case, the image correction method shown in FIG. 3 does not provide a 52nd step.

6 is a flowchart for explaining another embodiment of an image correction method according to the present invention, comprising: storing an original image and a symmetric image together (step 70), reading image data (step 72), and Scanning the image data (step 74).

According to the present invention, first, the transform storage unit 30 stores the original image consisting of image data of M rows x N columns size together with the symmetric image (step 70). Here, the symmetric image (or mirror image) means an image symmetrically perpendicular to the original image. To this end, according to the present invention, the conversion storage unit 30 converts the original image consisting of image data of M rows x N columns into a symmetric image, and the image data of M rows x N columns below the original image. Can be stored in a vertical direction adjacent to each other.

7 (a) to 7 (c) are exemplary diagrams for explaining the operation of each part of the apparatus shown in FIG. 2, and FIG. 7 (a) shows an exemplary view of an original image, and FIG. An example of the original image and the symmetric image stored in the conversion storage unit 30 is shown, and Fig. 7 (c) shows an example of the scanned image, respectively. (Question: Scanned shown in Fig. 7 (c). Shouldn't the image be the same as the original image shown in Figure 7 (a)?)

For example, when M = 4 and N = 6, the conversion storage unit 30 inputs an original image as shown in FIG. 7 (a) through the input terminal IN2, as shown in FIG. 7 (b). Similarly, the symmetric image 92 may be converted, and the converted symmetric image 92 and the original image 90 may be stored together as shown in FIG. That is, the conversion storage unit 30 stores the symmetric image 92 including 4 × 6 size image data adjacent to each other in the vertical direction under the original image 90 having 4 × 6 size image data. Can be.

After operation 70, the storage control unit 32 reads the image data of the n (1≤n≤N) th column stored from the conversion storage unit 30 from the top to the bottom, and then stores the image data of the n + 1th column from the top. The image is read down to the micro scanning mirror 34 (step 72). Alternatively, the storage control unit 32 reads out the image data of the n (1 ≦ n ≦ N) column stored in the conversion storage unit 30 from the bottom up and then scans the image data of the n + 1 th column from the bottom up into the micro scanning mirror. (34) can also be read. That is, the direction of reading the image data of the column is preferably unified, but the present invention is not limited thereto.

If the original image 90 and the symmetric image 92 are stored in the storage unit 30 as shown in FIG. 7 (b), the storage control unit 32 stores the first row of FIG. 7 (b). After reading the image data from the top to the bottom, the image data of the second to sixth columns is also read in the same direction from the top to the bottom. That is, the storage control unit 32 reads the image data of the second column shown from FIG. 7B from the top to the bottom, and then reads the image data of the third column from the top to the bottom. Next, the storage control unit 32 reads the image data of the third column from the top to the bottom after reading the image data of the third column shown in FIG. 7 (b). This operation repeats for the next column.

After operation 72, the micro scanning mirror 34 scans image data read from the conversion storage unit 30 in the vertical direction (operation 74).

For example, as shown in FIG. 7B, when the original image 90 and the symmetric image 92 stored in the conversion storage unit 30 are read under the control of the storage control unit 32 as described above, The micro scanning mirror 34 first scans the image data '1', '2', '3', and '4' in the first row in the direction of arrow ① as shown in FIG. The image data '4', '3', '2', and '1' in the first column can be repeatedly scanned sequentially in the direction of arrow ②. (If the above questions are correct, should it be correct? Thus, according to the present invention, after the image data of the original image 90 of the nth column is scanned from top to bottom, it is repeatedly scanned once more of the image data of the symmetric image 92 of the nth column. , The brightness of the image does not decrease.

As a result, according to the present invention, the conversion storage unit 30 generates the image data of the M row x N column size into the image data of the 2 M row x N column size, and when the vertical synchronization signal is generated twice, the 2 M x N Since the image data of the size is scanned once, the original image of M rows x N columns can be scanned while maintaining the brightness of the screen.

The image correction apparatus and method according to the present invention scan the image data using the micro scanning mirror 34 in the vertical direction as described above. However, the present invention is not limited thereto and may be implemented differently from that shown in FIG. That is, if the image data of a column can only be repeatedly scanned from the bottom to the bottom of the image data of the column after being scanned from top to bottom, the image correction apparatus according to the present invention shown in FIG. It may not be provided. In this case, the image correcting method illustrated in FIG. 6 does not provide a 72nd step.

For example, the conversion storage unit 30 and the storage control unit 32 of the image correction apparatus according to the present invention shown in FIG. 2 may be embedded in the video signal processing unit 10 shown in FIG. 1. In this case, the image data read out from the conversion storage unit 30 serves as a control signal for controlling the light emitted from the light source 12 to the micro scanning mirror 34, and the conversion storage unit 30 and the microcomputer. The light source 12 may be provided between the scanning mirrors 34.

As described above, the apparatus and method for correcting an image according to the present invention has an effect of reducing the brightness of a screen while scanning image data using a micro scanning mirror.

Claims (11)

A conversion storage unit for reversing and storing the image data left and right across at least one row when storing an original image including image data of M rows × N columns; And And a micro scanning mirror which scans the image data read out from the conversion storage unit in a horizontal direction. The image correction apparatus of claim 1, Reading the image data of the m (1? M? M) row stored from the left to the right after reading the image data of the m + 1 th row from the left to the right with the micro scanning mirror; And a storage control unit. The method of claim 1, wherein the conversion storage unit And storing the image data of even-numbered rows left and right inverted when the original image is stored. The method of claim 1, wherein the conversion storage unit And storing the image data of the odd-numbered row in left and right directions when storing the original image. The image correcting apparatus of claim 1, wherein the left and right inverted image data is scanned in a blanking period. A conversion storage unit for storing an original image consisting of image data having a size of M rows × N columns, the symmetric image symmetrically perpendicular to the original image together with the original image; And And a micro scanning mirror which scans the image data read out from the conversion storage unit in a vertical direction. The image correction apparatus of claim 6, A storage control unit which reads the image data of the n (1 ≦ n ≦ N) th column stored from the top to the bottom after reading the image data of the n + 1th column from the top to the micro scanning mirror Further provided, The transformation storage unit stores the symmetrical image formed of the image data of the M row X N column size in the vertical direction adjacent to the bottom of the original image formed of the image data of the M row X N column size. Image correction device. An image correction method performed by an image correction apparatus for scanning image data using a micro scanning mirror, When storing an original image consisting of image data of M rows × N columns, storing the image data left and right by crossing over at least one row; And And scanning the stored image data in a horizontal direction. The method of claim 8, wherein the image correction method Reading out the stored image data of the m (1≤m≤M) th row from left to right, and then reading the image data of the m + 1th row from left to right and proceeding to the scanning step Image correction method characterized in that it further comprises. An image correction method performed by an image correction apparatus for scanning image data using a micro scanning mirror, When storing an original image consisting of image data of M rows x N columns, storing a symmetric image symmetrically perpendicular to the original image together with the original image; And And scanning the stored image data in a vertical direction. The method of claim 10, wherein the image correction method Reading out the image data of the stored n (1≤n≤N) th column from top to bottom, and then reading the image data of the n + 1th column from top to bottom and proceeding to the scanning step Equipped, The storing may include storing, in the vertical direction, adjacent to the symmetrical image composed of the image data of the M row X N column size under the original image composed of the image data of the M row X column size. An image correction method characterized by the above-mentioned.

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