KR100518826B1 - Apparatus and method for video adjustment according to optical distortion adjustment of projection tv - Google Patents

Abstract

An image correction apparatus and a correction method are disclosed. The image correction device according to the optical distortion correction of the projection TV according to the present invention, the optical distortion correction for performing optical distortion correction on the optical distortion screen, and through the optical distortion correction, the optical distortion image and optical distortion correction A correction angle calculation unit that calculates a correction angle based on the screen, and calculates a correction value based on the correction angle and each row of pixels on the optical distortion screen, and based on the correction value and the luminance value applied to each row of the screen before the optical distortion correction. Calculates a corrected luminance value by performing a predetermined calculation process, and adjusts the luminance on the screen after correcting the optical distortion by the corrected luminance value based on each row of pixels on the screen. Compensation value is calculated, and the predetermined value is calculated based on the correction value and the contrast value applied to each row of the screen before optical distortion correction. Calculating a corrected contrast value by performing a process, and includes a contrast correction for adjusting the contrast of optical distortion after correction by the correction value display contrast. Such an image correcting apparatus may perform luminance and contrast correction according to optical distortion correction by an easy-to-implement apparatus, and at the same time, luminance and contrast correction may also be performed.

Description

Image correction apparatus and correction method according to optical distortion correction of projection TV {APPARATUS AND METHOD FOR VIDEO ADJUSTMENT ACCORDING TO OPTICAL DISTORTION ADJUSTMENT OF PROJECTION TV}

The present invention relates to an image correction device and a correction method according to optical distortion correction of a projection TV.

Today's TV is an indispensable household appliance in our lives, and as our standard of living improves, we demand high quality TV. Among the high quality TVs thus developed, a projection TV uses a lens to enlarge an image formed on a red, green, and blue cathode ray tube (CRT), and reflect the enlarged image on a mirror. The viewer then shows an enlarged TV picture to the viewer by illuminating the screen to a large screen.

However, since the image displayed on the screen of the projection TV is influenced by the position and angle of the CRTs, the optical element, and so on, it necessarily involves optical distortion.

The optical distortion is nonlinear due to various factors such as the position of the CRT and the mirror, the magnification of the lens, the magnetic field, and the like, and the pincushion distortion caused by the CRT and the lens. And keystone distortion caused by the reflection of the mirror.

The pincushion distortion is a distortion caused by an increase in the traveling distance of the electron beam generated and output from the CRT (in detail, the electron gun), away from the center of the CRT. On the other hand, the keystone distortion is a reflection point in the image of the lens different from the mirror. The reflection path is changed from the mirror to the screen so that, for example, a distortion of a rectangular image is transformed into a trapezoidal image, and is uniformly generated for the entire image displayed on the screen.

Other optical distortions include barrel distortion.

Therefore, a correction device for correcting the optical distortion as described above is required, and a scaler is mainly used as the optical distortion correction device for correcting the optical distortion.

On the other hand, when optical distortion occurs, a change in brightness or contrast inevitably occurs. This is caused by the difference in the speed of electrons reaching the screen because the distance that the beam current emitted from the CRT reaches the screen is similar to the cause of the keystone distortion described above. Therefore, a device for correcting luminance to contrast is also required.

Conventionally, a luminance compensator for compensating luminance includes a current detector, a driver, and a luminance compensator. The current detector is a FBT (FlyBack Transformer), which senses the intensity of a beam current flowing into a CRT, and the driver is a current. A voltage is inversely proportional to the intensity of the beam current derived from the sensing unit. The luminance correction unit receives the output voltage of the driving unit and outputs the luminance correction signal to the video preamplifier when the luminance correction signal level is higher than a predetermined level. The clamp level of the RGB video signal in the video preamplifier is adjusted to be lowered, thereby correcting the luminance to correct the luminance of the screen.

Also, conventionally, a brightness correction device for correcting brightness detects brightness of each pixel constituting an input image and calculates a probability density function (PDF) based on the probability density function calculation unit (PDF: Probability Density Function). ) And an image based on a cumulative distribution function (CDF) and a calculated cumulative distribution function (CDF) that accumulate sequentially a probability density function (PDF) to calculate a cumulative distribution. ) Has a high brightness as a whole, and has a mapping unit that performs an operation of mapping the low brightness pixels to more brightness values, thereby correcting the contrast of the screen.

Therefore, conventionally, each of the above-mentioned devices and methods have had the trouble of correcting optical distortion, brightness, and contrast according to the user's requirements. There was a problem that caused rise and complexity of the production process.

The technical problem to be achieved by the present invention, by the device and method that can be easily implemented can perform the correction for the luminance or contrast in accordance with the optical distortion correction, the correction for the luminance and contrast by performing the optical distortion correction at the same time The present invention provides an image correction device and a correction method according to optical distortion correction of a projection TV.

In order to solve the above technical problem, the image correction apparatus according to the optical distortion correction of the projection TV according to the present invention, through the optical distortion correction for performing optical distortion correction on the optical distortion screen, and through the optical distortion correction, A correction angle calculation unit for calculating a correction angle based on the optical distortion screen and the correction screen on which the optical distortion is corrected, and a correction value based on the correction angle and each row of pixels on the optical distortion screen, and calculating the calculated angle Compensating the luminance value by adding the luminance values applied to the luminance correction of each row on the screen before the correction value and the optical distortion correction, and then adjusting the luminance on the screen after the optical distortion correction by the corrected luminance values. It includes.

The calculation process of calculating the luminance value corrected by the luminance correction unit is preferably Y1 (k) '= Y1 (k) + Z (k, a).

In addition, to solve the above technical problem, the image correction apparatus according to the optical distortion correction of the projection TV according to the present invention, the optical distortion correction for performing optical distortion correction on the optical distortion screen, and the optical distortion correction A correction angle calculation unit for calculating a correction angle based on the optical distortion screen and the correction screen on which the optical distortion is corrected, and a correction value based on the correction angle and each row of pixels on the optical distortion screen; And a contrast correction unit for calculating a corrected contrast value by multiplying the contrast value applied to the contrast correction of each row on the screen before the optical distortion correction, and then adjusting the contrast on the screen after the optical distortion correction by the corrected contrast value. do.

Further, the correction value is calculated based on the correction angle and each row of pixels on the optical distortion screen, and a predetermined calculation process is performed based on the correction value and the luminance value applied to each row of the screen before the optical distortion correction. And a luminance correction unit for calculating a corrected luminance value and adjusting the luminance on the screen after the optical distortion correction by the corrected luminance value.

The calculation process of calculating the luminance value corrected by the luminance correction unit is preferably Y1 (k) '= Y1 (k) + Z (k, a).

It is preferable that the calculation process of calculating the contrast value corrected by the contrast correction unit is Y2 (k) '= Y2 (k) * Z (k, a).

In order to solve the above technical problem, the image correction method according to the optical distortion correction of the projection TV according to the present invention, the step of calculating the correction angle on the basis of the optical distortion screen and the correction screen in which the optical distortion is corrected, the correction Calculating a correction value based on an angle and each row of pixels on the optical distortion screen, calculating a corrected luminance value by summing the correction value and a luminance value applied to luminance correction of each row of the optical distortion screen; And adjusting the luminance of the corrected screen by the corrected luminance value.

In the above, it is preferable that the calculation process of calculating the corrected luminance value is Y1 (k) '= Y1 (k) + Z (k, a).

In addition, in order to solve the above technical problem, the image correction apparatus according to the optical distortion correction of the projection TV according to the present invention, the step of calculating the correction angle on the basis of the optical distortion screen and the correction screen, the optical distortion is corrected, Calculating a correction value based on the correction angle and each row of pixels on the optical distortion screen, and calculating a corrected contrast value by multiplying the correction value and the contrast value applied to the contrast correction of each row on the optical distortion screen. And adjusting the contrast of the correction screen by the corrected contrast value.

In the above, the calculation process for calculating the corrected contrast value is preferably Y2 (k) '= Y2 (k) * Z (k, a).

According to the image correction device and the correction method according to the optical distortion correction of the projection TV according to the present invention, it is possible to perform the correction for the luminance or contrast in accordance with the optical distortion correction by the device and method that is easy to implement, optical distortion correction Correction for luminance to contrast can also be performed by performing.

Hereinafter, an image correction apparatus and a correction method according to optical distortion correction of a projection TV according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1A is a diagram of a vertical keystone distortion screen of a light beam narrowing in a projection TV screen, and FIG. 1B is a diagram of a horizontal keystone distortion screen of a left beam right in a projection TV screen, and FIG. 1C is a pincushion distortion of a projection TV screen. 1D is a diagram of a barrel distortion screen for a projector TV screen.

However, in the present specification, the screen is a surface on which an image is formed, and the screen is defined as an image formed on the screen, respectively.

As mentioned above, optical distortions such as keystone distortion, pincushion distortion and barrel distortion occur due to factors such as CRT and mirror position, lens magnification and magnetic field.

Accordingly, the keystone distortion screen 2a, 2b, pincushion distortion screen 2c, and barrel distortion screen 2d projected on the screen as shown in the respective figures take into account the correction angles 4a, 4b, 4c, and 4d. The scaler corrects the correction screens 3a, 3b, 3c, and 3d.

In addition to the distortions, distortions occur in luminance or contrast of the optical distortion screens 2a, 2b, 2c, and 2d.

Accordingly, in the case of FIG. 1A, the upper side of the screen 2a is relatively dark and the lower side is bright. In the case of FIG. 1B, the left side of the screen 2b is dark and the right side is relatively bright. The upper and lower sides of 2c) are dark and bright in the middle, and in the case of FIG. 1D, the upper and lower sides of the screen 2d are relatively bright and the middle is bright.

2 is a block diagram of an image correction apparatus according to optical distortion correction according to the present invention.

The optical distortion correction unit 10 corrects the optical distortion images 2a, 2b, 2c, and 2d on the screen 100 by an optical distortion correction method. Since the optical distortion correction method is a known method, a detailed description thereof is omitted herein.

The correction angle calculation unit 11 calculates correction angles 4a, 4b, 4c and 4d based on the optical distortion screens 2a, 2b, 2c and 2d and the correction screens 3a, 3b, 3c and 3d. The correction angles 4a, 4b, 4c, and 4d are output to the luminance correction unit 20 and the contrast correction unit 30.

The brightness correction unit 20 includes a first correction value calculation unit 21, a corrected brightness value calculation unit 22, and a brightness adjustment unit 23.

The first correction value calculator 21 receives correction angles 4a, 4b, 4c, and 4d to calculate correction values. In calculating the correction value, each row of the pixel on the screen is also considered, and various other variables are applied, but for convenience of description, it is assumed that the correction value is determined only by the correction angle and each row of the pixel on the screen. do.

The luminance value calculator 22 calculates the corrected luminance value by performing a predetermined operation based on the calculated correction value and the luminance value applied to each row of the previous screen.

The brightness adjusting unit 23 adjusts the brightness of the screen by applying the corrected brightness value calculated above to the screen on the screen.

In addition, the contrast correction unit 30 includes a second correction value calculation unit 31, a corrected contrast value calculation unit 32, and a contrast adjustment unit 33.

The second correction value calculation unit 31 receives correction angles 4a, 4b, 4c, and 4d and calculates correction values. In calculating the correction value, each row of the pixel on the screen is also considered, and various other variables are applied, but for convenience of description, it is assumed that the correction value is determined only by the correction angle and each row of the pixel on the screen. do.

The contrast value calculator 32 calculates the corrected contrast value by performing a predetermined operation based on the calculated correction value and the contrast value applied to each row of the previous screen.

The contrast adjusting unit 33 applies the corrected contrast value calculated above to the screen on the screen to adjust the contrast of the screen.

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

Hereinafter, a description will be given of a correction for vertical keystone distortion of an image light substrait as an embodiment, but this is for convenience of description and may be equally applied to other optical distortions.

First, a user displays a screen setting menu (not shown) on the screen 100 through an input unit (not shown) such as a remote controller.

Then, when the vertical keystone distortion correction (not shown) is selected in the screen setting menu, the vertical keystone distortion correction is performed by the optical distortion correction unit 10 (S100).

When the operation is performed, the correction angles 4a: a are calculated by the correction angle calculation unit 11 based on the vertical keystone distortion screen 2a and the correction screen 3a on which the vertical keystone distortion is corrected (S200).

In step 200, the correction angles 4a and a are immediately output to the first correction value calculating unit 21 in the luminance correction unit 20 and the second correction value calculating unit 31 in the contrast correction unit 30 (S300). S400)

The first and second correction value calculators 21 and 31, which receive the correction angles 4a and a, respectively calculate the correction values based on the correction angles 4a and a and each row of pixels on the screen. (S310, S410)

The calculated correction values perform a predetermined calculation with the luminance value and the contrast value applied to each row of the previous screen, and as a result of the correction, the corrected luminance value and the corrected contrast value are calculated. (S320 to S330 and S420 to S430).

Luminance correction and contrast correction are performed on the correction screen 3a in which vertical keystone distortion is corrected by the corrected luminance value and the corrected contrast value (S340, S440).

The above-mentioned matters will be described in more detail as follows.

However, in the following description, for convenience of explanation, it is assumed that the vertical keystone distortion correction by the user is performed in three stages of the first to third vertical keystone distortion correction.

FIG. 4A is a diagram illustrating a pre-correction screen which is in a state of vertical keystone distortion correction by a user in one embodiment of the present invention, and shows a correction operation process for luminance, and FIG. Fig. 1 shows a before correction screen which is in a state before vertical keystone distortion correction, and shows a correction calculation process for contrast.

Y1 (k) represents the luminance value before correction in k rows of pixels on the screen, Y1 '(k) represents the luminance value after correction in k rows of pixels on the screen, and Y2 (k) represents the luminance value of the pixels on the screen. The contrast value before correction in k rows is shown, and Y2 '(k) represents the contrast value after correction in k rows of pixels on the screen. Here, k may take a value from 1 to n, and n may be set differently according to the resolution of the screen.

However, since this figure shows the corrected vertical keystone distortion screen 200, Y1 (k) and Y1 '(k) are the same and Y2 (k) and Y2' (k) are the same.

FIG. 5A is a diagram illustrating a first correction screen in which a first vertical keystone distortion correction is performed by a user in an embodiment of the present invention, and shows a correction operation process for luminance, and FIG. 5B shows one embodiment of the present invention. In the embodiment, a first correction screen in which a first vertical keystone distortion correction is performed by a user is shown, and shows a correction calculation process for contrast.

When the first vertical keystone distortion correction is performed by the user, the correction angles calculated by the correction angle calculation unit 11 in this process, that is, the correction angles 410: a1 based on the screen before and after the correction, are curved. The first and second correction value calculation units 21 and 31 in the walking unit 20 and the contrast correction unit 30 are output, and the first correction value calculation unit 21 is input to the input correction angles 410: a1. The correction value Z (k, a1) determined by each row k of the pixels of the image is calculated, and the second correction value calculation unit 31 calculates the input correction angles 410: a1 and each row of pixels on the screen ( The correction value Z (k, a1) determined by k) is calculated.

The correction values calculated above and the luminance value Y1 (k) and the contrast value Y2 (k) applied to the luminance correction and the contrast correction of each row of the previous screen are the luminance values Y1 '(k) corrected by a predetermined operation. ) And contrast value Y2 '(k).

In one embodiment of the above calculation, Y1 '(k) = Y1 (k) + Z (k, a1) for luminance and Y2' (k) = Y2 (k) * Z (k for contrast. It is preferable to calculate by (a1).

In other words, each row of pixels on the screen is k, the luminance value before correction is Y1 (k), and the correction angle (a) and each row (k) of pixels on the screen when optical distortion correction is performed. According to the correction value determined according to Z (k, a), the luminance value Y1 (k) 'after the correction can be expressed as shown in equation (1).

Y1 (k) '= Y1 (k) + Z (k, a)

In addition, each row of pixels on the screen is k, the contrast value before correction is Y2 (k), and the correction angle a and each row k of pixels on the screen when optical distortion correction is performed. When the correction value determined according to Z (k, a) is expressed, the contrast value Y2 (k) 'after correction can be expressed as in Equation (2).

Y2 (k) '= Y2 (k) * Z (k, a)

Therefore, the luminance value Y1 '(k) and the contrast value Y2' (k) calculated by a predetermined operation in the first vertical keystone distortion correction state are applied to correct the first correction screen 210.

FIG. 6A illustrates a second correction screen in which a second vertical keystone distortion correction is performed by a user in an embodiment of the present invention, and illustrates a correction operation process for luminance, and FIG. 6B illustrates one embodiment of the present invention. In the embodiment, the second correction screen in which the second vertical keystone distortion correction is performed by the user is shown, and shows a correction operation process for contrast.

When the user performs the second vertical keystone distortion correction by continuing the vertical keystone distortion correction, the correction angles 420: a2 calculated by the correction angle calculation unit 11 in this process are the luminance correction 20 and the contrast beam. Outputted to the first and second correction value calculation units 21 and 31 in the government unit 30, respectively, and the first correction value calculation unit 21 outputs the input correction angles 420: a2 and each row of pixels on the screen (k). Calculates a correction value Z (k, a2) determined by the < RTI ID = 0.0 >), < / RTI > Calculate Z (k, a2).

The correction values calculated above, and the luminance value Y1 '(k) and the contrast value Y2' (k) applied to the luminance correction and the contrast correction of each row of the previous screen, are the luminance values Y1 'corrected by a predetermined operation. It is calculated as' (k) and contrast value Y2 '' (k).

In one embodiment of the predetermined operation, Y1 " (k) = Y1 '(k) + Z (k, a2) for luminance as shown in Equation 1, and contrast as shown in Equation 2 above. Y2 '' (k) = Y2 '(k) * Z (k, a2) is preferably calculated.

 Accordingly, the luminance value Y1 " (k) and the contrast value Y2 " (k) calculated by the predetermined operation in the second vertical keystone distortion correction state are applied to correct the second correction screen 220. FIG.

FIG. 7A is a diagram illustrating a third correction screen, that is, a final correction screen in which a third vertical keystone distortion correction is performed by a user in an embodiment of the present invention, and shows a correction calculation process for luminance, and FIG. 7B. FIG. 3 is a diagram illustrating a third correction screen in which a third vertical keystone distortion correction is performed by a user, that is, a final correction screen, and illustrates a process of correcting a contrast.

If the user performs the third vertical keystone distortion correction by continuing the vertical keystone distortion correction, the correction angles 430: a3 calculated by the correction angle calculation unit 11 in this process are the luminance correction 20 and the contrast. The first and second correction value calculation units 21 and 31 are output to the correction unit 30, and the first correction value calculation unit 21 outputs the input correction angles 430: a3 and each row of pixels on the screen. Calculates a correction value Z (k, a3) determined by the < RTI ID = 0.0 >), < / RTI > Calculate Z (k, a3).

The correction values calculated above and the luminance value Y1 " (k) and the contrast value Y2 " (k) applied to the luminance correction and the contrast correction of each row of the previous screen are the luminance values corrected by a predetermined operation. Y1 '' '(k) and contrast value Y2' '' (k).

In one embodiment of the predetermined operation, Y1 '' '(k) = Y1' '(k) + Z (k, a3) for luminance as shown in Equation 1, and contrast as shown in Equation 2 above. It is preferable to calculate Y2 '' '(k) = Y2' '(k) * Z (k, a3) with respect to.

 Therefore, the luminance value Y1 '' '(k) and the contrast value Y2' '' (k) calculated by the predetermined operation in the third vertical keystone distortion correction state are applied to the third correction screen, that is, the final correction screen 300. Correct it.

As a result, when the user performs the vertical keystone distortion correction, the user can see the corrected screen for the luminance and contrast at the same time as the vertical keystone correction.

However, the above-described embodiments only illustrate examples in which luminance and contrast are simultaneously corrected according to optical distortion correction, but the present invention is not limited thereto, and only luminance correction may be performed according to optical distortion correction. In addition, only contrast correction may be performed according to optical distortion correction.

According to the image correction device and the correction method according to the optical distortion correction of the projection TV according to the present invention, it is possible to perform the correction for the luminance or contrast in accordance with the optical distortion correction by the apparatus and method, which is easy to implement, optical distortion correction Correction for luminance to contrast can also be performed by performing.

Although the present invention has been described in detail with reference to exemplary embodiments above, those skilled in the art will understand that various modifications can be made without departing from the scope of the present invention with respect to the above-described embodiments. will be. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

FIG. 1A is a diagram of a vertical keystone distortion screen of a light beam under a projection TV screen; FIG.

1B is a diagram of a horizontal keystone distortion screen of a left light right side in a projection TV screen;

1C is a diagram of a pincushion distortion screen in a projection TV screen;

1D is a diagram of a barrel distortion screen in a projection TV screen;

2 is a block diagram of an image correction apparatus according to optical distortion correction according to the present invention;

3 is a flowchart illustrating an image correction method according to vertical keystone distortion correction according to an embodiment of the present invention;

FIG. 4A is a diagram illustrating a pre-correction screen which is in a state of vertical keystone distortion correction by a user in one embodiment of the present invention, and illustrates a correction operation process for luminance;

FIG. 4B is a diagram illustrating a pre-correction screen which is a state of vertical keystone distortion correction by a user in an embodiment of the present invention, and illustrates a correction operation process for contrast;

5A is a diagram illustrating a first correction screen in which a first vertical keystone distortion correction is performed by a user in an embodiment of the present invention, and shows a correction operation process for luminance;

FIG. 5B is a diagram illustrating a first correction screen in which a first vertical keystone distortion correction is performed by a user in an embodiment of the present invention, and shows a correction operation process for contrast;

FIG. 6A illustrates a second correction screen in which a second vertical keystone distortion correction is performed by a user in an embodiment of the present invention, and illustrates a correction operation process for luminance;

FIG. 6B is a diagram illustrating a second correction screen in which a second vertical keystone distortion correction is performed by a user in an embodiment of the present invention, and illustrates a correction operation process for contrast; FIG.

FIG. 7A is a diagram illustrating a third correction screen, that is, a final correction screen in which a third vertical keystone distortion correction is performed by a user in the embodiment of the present invention, and shows a correction calculation process for luminance; and ,

FIG. 7B is a diagram illustrating a third correction screen, that is, a final correction screen in which a third vertical keystone distortion correction is performed by a user, and illustrates a process of correcting contrast.

Explanation of symbols on the main parts of the drawings

1a, 1b, 1c, 1d: screens 2a, 2b, 2c, 2d: optically distorted

3a, 3b, 3c, 3d: Correction screen 4a, 4b, 4c, 4d: Correction angle

10: Optical Distortion Correction 11: Correction Angle Calculation

20: luminance compensation government 21: first correction value calculation

22: Corrected luminance value calculating unit 23: Luminance adjusting unit

30: Contrast correction part 31: 2nd correction value calculation part

32: Corrected contrast value calculation unit 33: Contrast adjustment unit

100: screen 200: vertical keystone distortion screen before correction

210: first correction screen 220: second correction screen

230: Final correction screen 400: Correction angle (a)

410: first correction angle (a1) 420: second correction angle (a2)

430: third correction angle (a3)

Claims (10)

Optical distortion correction for performing optical distortion correction on the optical distortion image;       A correction angle calculation unit configured to calculate a correction angle based on the optical distortion correction screen and the optical distortion correction correction screen based on the optical distortion correction; And, Compute a correction value based on the correction angle and each row of pixels on the optical distortion screen, and calculate the corrected luminance value by adding the calculated correction value and the luminance value applied to the luminance correction of each row on the screen before the optical distortion correction. And a brightness compensator for adjusting the brightness on the screen after the optical distortion is corrected by the corrected brightness value. The method of claim 1, The brightness correction unit, An image correction apparatus according to optical distortion correction of a projection TV, comprising calculating a corrected luminance value by calculating the following equation: Y1 (k) '= Y1 (k) + Z (k, a) Here, k denotes each row of pixels on the optical distortion screen, Y1 (k) 'denotes a luminance value after correction, Y1 (k) denotes a luminance value before correction, and Z (k, a) means a correction value determined according to the correction angle a and each row k of pixels on the optical distortion screen when optical distortion correction is performed. Optical distortion correction for performing optical distortion correction on the optical distortion image;       A correction angle calculation unit configured to calculate a correction angle based on the optical distortion correction screen and the optical distortion correction correction screen based on the optical distortion correction; And, A correction value is calculated based on the correction angle and each row of pixels on the optical distortion screen, and the corrected contrast value is calculated by multiplying the calculated correction value and the contrast value applied to the contrast correction of each row on the screen before the optical distortion correction. And a contrast compensator for adjusting contrast on the screen after the optical distortion correction by the corrected contrast value. The method of claim 3, Luminance corrected based on the correction angle and each row of pixels on the optical distortion screen, and performing a predetermined calculation process based on the correction value and the luminance value applied to each row of the screen before the optical distortion correction. And a luminance compensator for calculating a value and adjusting the luminance on the screen after the optical distortion correction by the corrected luminance value. The method of claim 4, wherein The brightness correction unit, An image correction apparatus according to optical distortion correction of a projection TV, comprising calculating a corrected luminance value by calculating the following equation: Y1 (k) '= Y1 (k) + Z (k, a) Here, k denotes each row of pixels on the optical distortion screen, Y1 (k) 'denotes a luminance value after correction, Y1 (k) denotes a luminance value before correction, and Z (k, a) means a correction value determined according to the correction angle a and each row k of pixels on the optical distortion screen when optical distortion correction is performed. The method according to claim 3 or 4, The contrast correction unit, An image correction apparatus according to optical distortion correction of a projection TV, comprising calculating a corrected contrast value by calculating the following equation: Y2 (k) '= Y2 (k) * Z (k, a) Here, k means each row of pixels on the optical distortion screen, Y2 (k) 'means a contrast value after correction, Y2 (k) means a contrast value before correction, and Z (k, a) means a correction value determined according to the correction angle a and each row k of pixels on the optical distortion screen when optical distortion correction is performed. Calculating a correction angle based on the optical distortion screen and the correction screen on which the optical distortion is corrected; Calculating a correction value based on the correction angle and each row of pixels on the optical distortion screen; Calculating a corrected luminance value by adding up the corrected value and the luminance value applied to the luminance correction of each row in the optical distortion screen; And, And adjusting the luminance of the corrected screen according to the corrected luminance value. The method of claim 7, wherein In the above, the image correction method according to the optical distortion correction, characterized in that for calculating the luminance value corrected by the following equation: Y1 (k) '= Y1 (k) + Z (k, a) Here, k denotes each row of pixels on the optical distortion screen, Y1 (k) 'denotes a luminance value after correction, Y1 (k) denotes a luminance value before correction, and Z (k, a) means a correction value determined according to the correction angle a and each row k of pixels on the optical distortion screen when optical distortion correction is performed. Calculating a correction angle based on the optical distortion screen and the correction screen on which the optical distortion is corrected; Calculating a correction value based on the correction angle and each row of pixels on the optical distortion screen; Calculating a corrected contrast value by multiplying the correction value and the contrast value applied to the contrast correction of each row in the optical distortion screen; And, And adjusting the contrast of the corrected screen based on the corrected contrast value. The method of claim 9, In the above, the image correction method according to the optical distortion correction, characterized in that for calculating the contrast value corrected by the following equation: Y2 (k) '= Y2 (k) * Z (k, a) Here, k means each row of pixels on the optical distortion screen, Y2 (k) 'means a contrast value after correction, Y2 (k) means a contrast value before correction, and Z (k, a) means a correction value determined according to the correction angle a and each row k of pixels on the optical distortion screen when optical distortion correction is performed.