JP2006093844A - Contour emphasis circuit and method, and display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contour emphasis circuit capable of obtaining an image with a sense of sharpness and further preventing the sense of sharpness from being lost even when a degree of the contour emphasis is suppressed in the case of applying two contour emphasis corrections comprising transient correction and sharpness correction to the image, and to provide a display apparatus provided with the contour emphasis circuit and a contour emphasis method. <P>SOLUTION: An input video signal is given to an edge detection circuit 6, and an edge component detection result 7 from the edge detection circuit 6 is given to a transient correction circuit 8 and a sharpness correction circuit 9. The transient correction circuit 8 generates a transient correction signal 10, and the sharpness correction circuit 9 generates a sharpness correction signal 11. Further, a multiplication coefficient α is multiplied with the transient correction signal 10 and a multiplication coefficient (1-α) is multiplied with the sharpness correction signal 11, and multiplication results 17, 18 are summed and the sum is output. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image edge enhancement circuit, a display device including the same, and an edge enhancement method.

  In general, there are two methods for emphasizing the outline of an image, transient correction and sharpness correction.

  Among these, the transient correction performs edge enhancement by making the inclination of the edge component of the image steep.

  In sharpness correction, contour enhancement is performed by adding overshoot and undershoot to the edge component of the image.

  Conventionally, the contour enhancement circuit has a circuit configuration in which an input video signal is input to a high-pass filter or a differentiation circuit to detect an edge component, and transient correction or sharpness correction is independently performed on the edge component. .

As prior art documents related to the present invention, there are, for example, Patent Documents 1 and 2.
Japanese Patent No. 3494888 Japanese Patent No. 3538074

  In the conventional edge emphasis circuit, when both the transient correction and the sharpness correction are performed on the video signal, since each correction circuit exists independently, for example, the transient correction is performed first, and then the sharpness correction is performed. When performing correction, the transient correction result is input to the sharpness correction circuit, and at the stage of edge detection by the sharpness correction circuit, the edge component of the video signal that has already undergone transient correction is detected. Therefore, there is a problem that a sharp image cannot be obtained as compared with the case where sharpness correction is performed.

  Further, when the degree of correction for contour emphasis is increased, there is a problem that the noise component is emphasized and the S / N ratio of the output of the contour emphasis circuit is deteriorated.

  The present invention has been made to solve the above problems, and when performing two edge enhancement corrections of transient correction and sharpness correction, a sharp image can be obtained. An object of the present invention is to provide a contour emphasizing circuit, a display device including the contour emphasizing circuit, and a contour emphasizing method capable of preventing the sharpness from being lost even if the degree of contour emphasis is suppressed.

  In order to solve the above problems, an edge emphasis circuit of the present invention detects an edge component signal in an input video signal and outputs the detected edge component signal; and an edge component signal from the edge detection circuit; A transient correction signal that generates a transient correction signal based on the input video signal and outputs the generated transient correction signal, an edge component signal detected by the edge detection circuit, and the input video signal. Generating a sharpness correction signal based on the sharpness correction circuit that outputs the generated sharpness correction signal; the transient correction signal output from the transient correction circuit; and the sharpness correction signal output from the sharpness correction circuit; A synthesis circuit for synthesizing and outputting It is characterized.

  In this case, the synthesis circuit multiplies the transient correction signal output from the transient correction circuit by a first multiplication coefficient α (α is a positive number less than 1) and outputs the first gain circuit; A second gain circuit that multiplies the sharpness correction signal output from the sharpness correction circuit by a second multiplication coefficient (1-α), and outputs an output signal from the first gain circuit; And an adder circuit that adds and outputs an output signal from the gain circuit.

  The contour emphasizing circuit according to the present invention detects an edge component signal in an input video signal and outputs the detected edge component signal, and a transient correction signal based on the edge component signal from the edge detection circuit. A transient correction circuit that generates and outputs the generated transient correction signal; a sharpness correction circuit that generates a sharpness correction signal based on the edge component signal detected by the edge detection circuit; and outputs the generated sharpness correction signal; A synthesis circuit that synthesizes and outputs the transient correction signal output from the transient correction circuit, the sharpness correction signal output from the sharpness correction circuit, and the input video signal. It is said.

  In this case, the synthesis circuit multiplies the transient correction signal output from the transient correction circuit by a first multiplication coefficient α (α is a positive number less than 1) and outputs the first gain circuit; A second gain circuit that multiplies the sharpness correction signal output from the sharpness correction circuit by a second multiplication coefficient (1-α), and outputs an output signal from the first gain circuit; It is preferable that the output circuit from the gain circuit and the input video signal be added to each other and output.

  A display device according to the present invention includes the contour emphasis circuit according to the present invention and a display unit that performs video display based on a video signal output from the contour emphasis circuit.

  For example, the display device of the present invention is a fixed pixel display device including a fixed pixel display device as the display unit. Specific examples of such a fixed pixel display device include a plasma display device including a plasma display panel as a fixed pixel display device, and a liquid crystal display device including a liquid crystal display panel as a fixed pixel display device.

  The contour emphasizing method according to the present invention performs transient correction using an edge detection step of detecting an edge component signal in an input video signal, the edge component signal detected by the edge detection step, and the input video signal. A transient correction step to be performed; a sharpness correction step to perform sharpness correction using the edge component signal detected by the edge detection step; and the input video signal; a transient correction result obtained by the transient correction step; And a synthesis step of synthesizing and outputting the sharpness correction result obtained by the sharpness correction step.

  In the synthesis step, a first multiplication result obtained by multiplying the transient correction result obtained in the transient correction step by a first multiplication coefficient α (α is a positive number less than 1) and the sharpness correction step are obtained. It is preferable to output the addition result of the second multiplication result obtained by multiplying the sharpness correction result by the second multiplication coefficient (1-α).

  The contour emphasizing method of the present invention includes an edge detection step of detecting an edge component signal in an input video signal, a transient correction step of performing transient correction using the edge component signal detected by the edge detection step, and the edge A sharpness correction step for performing sharpness correction using the edge component signal detected in the detection step, a transient correction result obtained by the transient correction step, a sharpness correction result obtained by the sharpness correction step, and the input video And a synthesis step of synthesizing and outputting the signals.

  In the synthesis step, a first multiplication result obtained by multiplying the transient correction result obtained in the transient correction step by a first multiplication coefficient α (α is a positive number less than 1) and the sharpness correction step are obtained. It is preferable to output the addition result of the second multiplication result obtained by multiplying the sharpness correction result by the second multiplication coefficient (1-α) and the input video signal.

  According to the present invention, the edge component signal in the input video signal is detected, and the transient correction and the sharpness correction are performed on the detection results, respectively. Therefore, the transient correction and the sharpness correction are not subjected to edge enhancement. Since it can be performed using the edge component signal, the sharpness of the video is not impaired.

  In addition, since the transient correction result and the sharpness correction result are combined and output, the output contour-enhanced video signal can be a video signal that has been subjected to two corrections of sharpness correction and transient correction.

  Furthermore, the transient correction circuit and the sharpness correction circuit share one edge detection circuit. Compared to the conventional case where the transient correction circuit and the sharpness correction circuit exist independently and each has an edge detection circuit. Thus, the circuit scale can be reduced.

  Here, in FIG. 1, waveform 1 is a waveform when conventional sharpness correction is performed, waveform 2 is a waveform when conventional transient correction is performed, and waveforms 3a and 3b are input when sharpness correction is performed. When changing the degree of contour emphasis correction for the video signal, the overshoot and undershoot waveforms when the edge overshoot and undershoot sizes are reduced, waveform 4 is the waveform according to the present invention. As shown in FIG. 1, a waveform in the case of reducing the size of the conventional overshoot and undershoot (overshoot is waveform 3a, undershoot is waveform 3b, and the middle portion thereof is waveform 1) and waveform 4 of the present invention. In the present invention, since the sharpness correction result and the transient correction result are synthesized and output, the overshoot and the undershoot are smaller than the waveform 1 due to the mixture with the transient correction, but the edge The slope becomes steep by mixing with transient correction. Therefore, according to the present invention, the sharpness of the image is not lost even if the overshoot and undershoot are reduced.

  Also, the transient correction result is multiplied by α (α is a positive number less than 1), the sharpness correction result is multiplied by (1−α), and the multiplication result of the transient correction result and the multiplication result of the sharpness correction result are obtained. In the case of adding and outputting, the mixing ratio of sharpness correction and transient correction can be arbitrarily changed by changing the value of α.

  Embodiments according to the present invention will be described below with reference to the drawings.

[First Embodiment]
FIG. 2 is a block diagram showing the contour emphasizing circuit 100 according to the first embodiment of the present invention, and FIG. 3 is a flowchart for explaining the operation of the contour emphasizing circuit 100.

  As shown in FIG. 2, the edge emphasis circuit 100 according to the present embodiment detects a video signal input terminal 5 to which a video signal is input and an edge component signal in the input video signal (hereinafter referred to as an input video signal). An edge detection circuit 6, a transient correction circuit 8 that performs transient correction on the input video signal, a sharpness correction circuit 9 that performs sharpness correction on the input video signal, and outputs from these transient correction circuit 8 and sharpness correction circuit 9 A synthesizing circuit 12 for synthesizing and outputting the synthesized signals, and a contour-enhanced video signal output terminal 20 for outputting the signals outputted from the synthesizing circuit 12 to the outside.

  Among these, the A / D converted video signal is input to the video signal input terminal 5 (step S1), and the input video signal is input to the edge detection circuit 6, the transient correction circuit 8, and the sharpness correction circuit 9, respectively. The

  Among these, the edge detection circuit 6 detects the edge component 7 of the video signal based on the input video signal from the video signal input terminal 5 (step S2).

  The edge component 7 detected by the edge detection circuit 6 is input to the transient correction circuit 8 and the sharpness correction circuit 9, respectively.

  The transient correction circuit 8 and the sharpness correction circuit 9 also receive an input video signal from the video signal input terminal 5.

  The transient correction circuit 8 generates a transient correction original signal that is a source of the transient correction signal 10 based on the edge component 7 from the edge detection circuit 6, and further synthesizes the generated transient correction original signal and the input video signal. Thus, the transient correction signal 10 is generated, and the transient correction signal 10 is output to the synthesis circuit 12 (step S4).

  On the other hand, the sharpness correction circuit 9 generates a sharpness correction original signal that is the basis of the sharpness correction signal 11 based on the edge component 7 from the edge detection circuit 6, and further generates the generated sharpness correction original signal and the input video signal. The sharpness correction signal 11 is generated by the synthesis, and the sharpness correction signal 11 is output to the synthesis circuit 12 (step S3).

  Here, the sharpness correction original signal is an overshoot and undershoot in the sharpness correction signal 11.

  As shown in FIG. 2, the combining circuit 12 includes multiplication coefficient input terminals 13 and 14, multipliers 15 and 16, and an adder 19.

  Among these, the first multiplication coefficient is input from the multiplication coefficient input terminal 13, and the second multiplication coefficient is input from the multiplication coefficient input terminal 14.

  Here, the sum of the first and second multiplication coefficients is 1. That is, when the first multiplication coefficient is α (0 ≦ α ≦ 1), the second multiplication coefficient is represented by (1−α).

  The multiplier 15 multiplies the transient correction signal 10 from the transient correction circuit 8 by the multiplication coefficient α from the input terminal 13, and outputs the transient correction signal 17 after the multiplication to the adder 19 (step S5). .

  On the other hand, the multiplier 16 multiplies the multiplication coefficient (1-α) from the input terminal 15 by the sharpness correction signal 11 from the sharpness correction circuit 9 and outputs the multiplied sharpness correction signal 18 to the adder 19. (Step S6).

  The adder 19 multiplies the signal from the multiplier 15, that is, the transient correction signal 17 multiplied by the first multiplication coefficient α, and the signal from the multiplier 16, that is, the second multiplication coefficient (1−α). The added sharpness correction signal 18 and the added video signal (contour emphasis video signal) are output to the outside of the contour emphasis circuit 100 via the contour emphasis video signal output terminal 20 (step S7).

  According to the first embodiment as described above, the following effects can be obtained.

  (1) In the contour enhancement circuit 100 according to the present embodiment, an input video signal is input to the edge detection circuit, and an edge detection signal output from the edge detection circuit is input to the transient correction circuit and the sharpness correction circuit. Therefore, the edge detection signal input to the transient correction circuit and the sharpness correction circuit is detected from the original video signal that has not been subjected to the contour enhancement correction, and the sharpness of the video is not lost.

  (2) When the transient correction circuit and the sharpness correction circuit share one edge detection circuit, the conventional transient correction circuit and the sharpness correction circuit exist independently, and each has an edge detection circuit. The circuit scale can be reduced as compared with.

  (3) In FIG. 1, waveform 1 is a waveform when conventional sharpness correction is performed, waveform 2 is a waveform when conventional transient correction is performed, and waveforms 3a and 3b are input when sharpness correction is performed. When changing the degree of edge enhancement correction for the video signal, the overshoot and undershoot waveforms when the edge overshoot and undershoot sizes are reduced, waveform 4 is corrected by the edge enhancement circuit 100 according to the present embodiment. It is a waveform obtained by performing. As shown in FIG. 1, in the case of the present embodiment, the waveform in the case of reducing the size of the conventional overshoot and undershoot (overshoot is waveform 3a, undershoot is waveform 3b, and the middle portion thereof is waveform 1). In this embodiment, since the sharpness correction result and the transient correction result are combined and output in this embodiment, the overshoot and the undershoot are smaller than those of the waveform 1 due to the mixture with the transient correction. However, the slope of the edge becomes steep by mixing with the transient correction. Therefore, in the case of the present embodiment, the sharpness of the image is not lost even if the overshoot and undershoot are reduced.

  (4) Multiply the transient correction result by α (α is a positive number of 1 or less), multiply the sharpness correction result by (1−α), and multiply the transient correction result by the sharpness correction result. Therefore, the mixing ratio of sharpness correction and transient correction can be arbitrarily changed by changing the value of α.

[Second Embodiment]
In the second embodiment, in the operation of the edge emphasis circuit 100 described in the first embodiment, a process for determining whether only sharpness correction or only transient correction is performed is added to the video signal. An example in which either sharpness correction or transient correction is performed will be described.

  That is, by setting the value of the multiplication coefficient α for the transient correction signal 10 in FIG. 2 to “1” and the value of the multiplication coefficient (α−1) for the sharpness correction signal 11 to “0”, the sharpness correction side As a result of the sharpness correction signal 11 being removed by the multiplier 16, the transient correction signal 10 is output from the contour-enhanced video signal output terminal 20, so that the circuit of FIG. 2 can be operated as a transient correction circuit.

  Further, in the circuit of FIG. 2, the value of the multiplication coefficient (α−1) for the sharpness correction signal 11 is set to “1”, and the multiplication coefficient α for the transient correction signal 10 is set to “0”, thereby correcting the transient. As a result of the transient correction signal 10 being removed by the multiplier 15 on the side, the sharpness correction signal 11 is output from the contour-enhanced video signal output terminal 20, so that the circuit of FIG. 2 can be operated as a sharpness correction circuit.

  FIG. 4 is a flowchart for explaining the operation in the case of the second embodiment.

  As shown in FIG. 4, after performing steps S1 to S4 in the same manner as in the first embodiment, it is determined whether or not only sharpness correction is to be performed (step S8).

  Note that whether to perform only sharpness correction or only transient correction can be determined by a user setting operation, for example, but it is determined which correction is to be performed according to the input video signal. Anyway.

  In step S8, it is determined whether or not only sharpness correction is performed. When it is determined that only sharpness correction is to be performed (YES in step S8), the process proceeds to step S10 and step S11. In step S10, the multiplier 16 multiplies the sharpness correction signal 11 by the coefficient “1”, while step S11. Then, the multiplier 15 multiplies the transient correction signal 10 by a coefficient “0”. In the subsequent step S7, the adder 19 adds the two signals after multiplication by the multipliers 15 and 16, and outputs the result as a contour-enhanced output video signal. That is, since the transient correction signal 10 is removed in step S11, the sharpness correction signal 11 is output as a contour emphasis output video signal in step S7, and the circuit of FIG. 2 functions as a sharpness correction circuit.

  On the other hand, when it is determined in step S8 that only the transient correction is performed (NO in step S8), the process proceeds to step S9 to determine whether or not only the transient correction is performed. When it is determined that only the transient correction is performed (YES in step S9), the process proceeds to step S12 and step S13. In step S12, the multiplier 15 multiplies the transient correction signal 10 by the coefficient “1”, while step S13. Then, the multiplier 16 multiplies the sharpness correction signal 11 by a coefficient “0”. In the subsequent step S7, the adder 19 adds the two signals after multiplication by the multipliers 15 and 16, and outputs the result as a contour-enhanced output video signal. That is, since the sharpness correction signal 11 is removed in step S13, the transient correction signal 10 is output as the contour emphasis output video signal in step S7, and the circuit of FIG. 2 functions as a transient correction circuit.

  According to the second embodiment as described above, the contour emphasis circuit 100 described in the first embodiment can be operated as a sharpness correction circuit or a transient correction circuit.

[Third Embodiment]
In the third embodiment, the transient correction circuit 8 outputs a transient correction original signal, which is a difference signal between the transient correction signal 10 and the input video signal, instead of the transient correction signal 10, while the sharpness correction circuit 9 Instead of the sharpness correction signal 11, an example of outputting a sharpness correction original signal, that is, a sharpness correction component, that is, an overshoot signal and an undershoot signal will be described.

  FIG. 5 is a block diagram showing an example of the circuit configuration of the edge emphasis circuit in the case of the third embodiment.

  As shown in FIG. 5, the outline emphasis circuit 200 according to the third embodiment includes an adder 21 to which an input video signal from an input terminal 5 and a signal from an adder 19 are input. Unlike the contour emphasis circuit 100 described in the first embodiment only in terms of provision, the other components are configured in the same manner as the contour emphasis circuit 100, and thus similar components are denoted by the same reference numerals. The description is omitted.

  FIG. 6 is a flowchart for explaining the operation in the case of the third embodiment.

  In the case of the third embodiment, as shown in FIG. 6, first, steps S1 to S4 are performed in the same manner as in the first embodiment.

  Subsequent to step S3, the sharpness correction circuit 9 outputs only the sharpness correction component of the sharpness correction signal 11, that is, the overshoot signal and the undershoot signal, to the multiplier 16 (step S14).

  Following step S14, the multiplier 16 multiplies the overshoot signal and the undershoot signal by a multiplication coefficient (1-α), respectively, and outputs the multiplied signal to the adder 19 (step S16). ).

  On the other hand, following step S4, only the difference signal between the transient correction signal 10 and the input video signal among the transient correction signal 10 is output from the transient correction circuit 8 to the multiplier 15 (step S15).

  Following step S15, the multiplier 15 multiplies the difference signal between the transient correction signal 10 and the input video signal by the multiplication coefficient α, and outputs the multiplied signal to the adder 19 (step S17). ).

  Next, the adder 19 adds the two signals after multiplication by the multipliers 15 and 16, and outputs the added signal to the adder 21 (step S18).

  Next, in the adder 21, the signal from the adder 19 and the input video signal are added, and the added signal (contour-enhanced video signal) is output via the contour-enhanced video signal output terminal 20. (Step S19).

  According to the third embodiment as described above, the same effect as in the first embodiment or the second embodiment can be obtained.

  The contour emphasis circuits 100 and 200 described in the above embodiments can be applied to, for example, a plasma display device including a plasma display panel as a display unit, but a liquid crystal display device including a liquid crystal display panel as a display unit. Alternatively, the present invention can be similarly applied to other display devices.

It is a figure which shows the waveform of the video signal which compared the outline emphasis of this invention with the conventional outline emphasis. It is a block diagram which shows the structure of the outline emphasis circuit which concerns on 1st Embodiment. It is a flowchart which shows operation | movement of 1st Embodiment. It is a flowchart which shows operation | movement of 2nd Embodiment. It is a block diagram which shows the structure of the outline emphasis circuit which concerns on 3rd Embodiment. It is a flowchart which shows operation | movement of 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waveform of edge part by conventional sharpness correction 2 Waveform 3a, 3b of edge part by conventional transient correction Waveform 4 of edge part by which correction amount of conventional sharpness correction was weakened (overshoot and undershoot were weakened) Output waveform by (sharpness correction and transient correction edge waveform)
5 Video signal input terminal 6 Edge detection circuit 7 Edge component 8 Transient correction circuit 9 Sharpness correction circuit 10 Transient correction signal 11 Sharpness correction signal 12 Synthesis circuit 13 Multiplication coefficient input terminal 14 Multiplication coefficient input terminal 15 Multiplier 16 Multiplier 17 Multiplication coefficient A transient correction signal 18 multiplied by a sharpness correction signal 19 multiplied by a multiplication coefficient 19 an adder 20 an edge-enhanced video signal output terminal

Claims (10)

An edge detection circuit that detects an edge component signal in the input video signal and outputs the detected edge component signal;
A transient correction circuit that generates a transient correction signal based on the edge component signal from the edge detection circuit and the input video signal, and outputs the generated transient correction signal;
A sharpness correction circuit that generates a sharpness correction signal based on the edge component signal detected by the edge detection circuit and the input video signal, and outputs the generated sharpness correction signal;
A synthesis circuit that synthesizes and outputs the transient correction signal output from the transient correction circuit and the sharpness correction signal output from the sharpness correction circuit;
An outline emphasizing circuit comprising: The synthesis circuit is:
A first gain circuit that multiplies the transient correction signal output from the transient correction circuit by a first multiplication coefficient α (α is a positive number equal to or less than 1) and outputs the result;
A second gain circuit that multiplies the sharpness correction signal output from the sharpness correction circuit by a second multiplication coefficient (1-α) and outputs the result;
An adder circuit that adds and outputs the output signal from the first gain circuit and the output signal from the second gain circuit;
The contour emphasizing circuit according to claim 1, comprising: An edge detection circuit that detects an edge component signal in the input video signal and outputs the detected edge component signal;
A transient correction circuit that generates a transient correction signal based on an edge component signal from the edge detection circuit, and outputs the generated transient correction signal; and
A sharpness correction circuit that generates a sharpness correction signal based on the edge component signal detected by the edge detection circuit, and outputs the generated sharpness correction signal;
A synthesis circuit that synthesizes and outputs the transient correction signal output from the transient correction circuit, the sharpness correction signal output from the sharpness correction circuit, and the input video signal;
An outline emphasizing circuit comprising: The synthesis circuit is:
A first gain circuit that multiplies the transient correction signal output from the transient correction circuit by a first multiplication coefficient α (α is a positive number equal to or less than 1) and outputs the result;
A second gain circuit that multiplies the sharpness correction signal output from the sharpness correction circuit by a second multiplication coefficient (1-α) and outputs the result;
An adder circuit that adds and outputs the output signal from the first gain circuit, the output signal from the second gain circuit, and the input video signal;
The contour emphasizing circuit according to claim 3, comprising: An edge enhancement circuit according to any one of claims 1 to 4,
A display unit that performs video display based on a video signal output from the contour enhancement circuit;
A display device comprising:   The display device according to claim 5, wherein the display device is a fixed pixel display device including a fixed pixel display device as the display unit. An edge detection step for detecting an edge component signal in the input video signal;
A transient correction step of performing transient correction using the edge component signal detected by the edge detection step and the input video signal;
A sharpness correction step of performing a sharpness correction using the edge component signal detected by the edge detection step and the input video signal;
A synthesis step of synthesizing and outputting the transient correction result obtained by the transient correction step and the sharpness correction result obtained by the sharpness correction step;
A contour emphasizing method comprising: In the synthesis step,
A first multiplication result obtained by multiplying the transient correction result obtained by the transient correction step by a first multiplication coefficient α (α is a positive number of 1 or less);
A second multiplication result obtained by multiplying the sharpness correction result obtained by the sharpness correction step by a second multiplication coefficient (1-α);
The outline enhancement method according to claim 7, wherein the result of addition is output. An edge detection step for detecting an edge component signal in the input video signal;
A transient correction step of performing transient correction using the edge component signal detected by the edge detection step;
A sharpness correction step of performing a sharpness correction using the edge component signal detected by the edge detection step;
A step of combining and outputting the transient correction result obtained by the transient correction step, the sharpness correction result obtained by the sharpness correction step, and the input video signal;
A contour emphasizing method comprising: In the synthesis step,
A first multiplication result obtained by multiplying the transient correction result obtained by the transient correction step by a first multiplication coefficient α (α is a positive number of 1 or less);
A second multiplication result obtained by multiplying the sharpness correction result obtained by the sharpness correction step by a second multiplication coefficient (1-α);
The input video signal;
The outline enhancement method according to claim 9, wherein the addition result is output.

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