KR100786094B1 - The display device for displaying a screen of enhanced sharpness, and the method for controlling the same - Google Patents

Abstract

A display device for displaying a screen with optimized sharpness, and a method thereof are provided to accentuate sharpness clearly while not generating noise and prevent shooting generated unnecessarily when accentuating the sharpness. A method for controlling a display device for displaying a screen with optimized sharpness comprises the following steps of: receiving video data; calculating a variation of the Y signal level value of each cell composing the received video data(S1001); and determining a degree of weight of the varied Y signal level value in proportion to the calculated variation of the Y signal level value of each cell in a filtering process of adjusting sharpness of the received video data(S1004~S1008).

Description

The display device for displaying a screen of enhanced sharpness, and the method for controlling the same}

1 illustrates an example of a filtering procedure for adjusting the sharpness of video data according to the prior art;

FIG. 2 illustrates another example of a filtering procedure for adjusting sharpness of video data according to the prior art. FIG.

3 is a block diagram illustrating a configuration of an image device displaying a screen having an optimized sharpness according to the present invention (block diagram).

4 is a block diagram illustrating a configuration of an image data adjusting unit of an imaging apparatus displaying a screen having an optimized sharpness according to the present invention.

5 illustrates data of a Y signal level value for each cell according to the present invention;

FIG. 6 is a diagram illustrating data about a change amount of a Y signal level value obtained through the data of FIG. 5. FIG.

FIG. 7 is a diagram illustrating a table defining a weighting degree that varies depending on a change amount of a Y signal level value according to the present invention. FIG.

8 illustrates an example of a filtering procedure for adjusting sharpness of video data according to the present invention.

9 illustrates another example of a filtering procedure for adjusting sharpness of video data according to the present invention.

FIG. 10 is a flowchart (flow chart) showing a control method of an image device displaying a screen having an optimized sharpness according to the present invention.

* Description of the symbols for the main parts of the drawings *

300: video device 310: A / D converter

320: Decoder 330: A / D converter

340: Scaler 350: video data adjustment unit

360: display module 351: filter unit

352: Y signal variation calculation unit 353: Y signal value weighting unit

354: limiter 355: control unit

356: memory section

The present invention relates to an image device, and more particularly, to an image device for displaying a screen of optimized definition and a control method thereof.

With the development of video devices, video devices with various functions have emerged, and especially high quality screens can be displayed.

Accordingly, interest from the user of the video device is increasing for a video device that clearly outputs a high quality screen without special noise.

In particular, in order to display a screen that is satisfactory to the user, it is a prerequisite to output a screen having good sharpness.

The sharpness is also interpreted as the clarity of the philosophy and represents the clarity of the contrast boundary of the image.

1 is a diagram illustrating an example of a filtering procedure for adjusting sharpness of video data according to the prior art.

FIG. 2 is a diagram illustrating another example of a filtering procedure for adjusting sharpness of video data according to the prior art.

Hereinafter, a filtering process for adjusting sharpness of conventional video data will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, when the band peak filtering process is performed to emphasize sharpness, the Y signal level value changes.

However, in brief description of the Y signal, an electric signal representing the contrast of an image in a television or a video system is called a luminance signal. In a color television or a video system, a luminance signal is used to reduce the frequency bandwidth of a transmission signal. A signal indicating color information is superimposed on the signal and transmitted.

In this case, a signal representing a brightness component is called a Y signal, and a signal component representing color information is called a C signal (chrominance signal).

The band peaking filtering process can be implemented, for example, to highlight brighter parts brighter and darker parts darker.

In particular, referring to FIG. 2, the band peaking filtering process will be described in detail as follows.

A conventional Y signal level value is detected, and a Y signal level value changed according to the characteristics of the filter is output using a filter pre-defined by an operator. At this time, as shown in FIG. 2, the range of Y to be varied by thresholding is specified, and weighting is performed.

However, the conventional apparatus for adjusting sharpness and a control method thereof have the following problems.

First, in the case of using a fixed passive filter as in the related art, when the sharpness is used, the noise increases, and when the NR (Noise Reduction) function is operated to reduce the noise, the edge And there was a problem that the detail (detail) is damaged.

That is, there is a problem that can not implement the screen of the image quality utilizing the sharpness without noise.

Second, in the case of using a fixed passive filter as in the related art, a shooting phenomenon in which unexpected lines are displayed on the screen is generated.

On the other hand, the Y signal includes edge information, detail and noise information. In the conventional method, the Y signal should emphasize sharpness and weakly sharpness. There was also a problem in that it is not possible to flexibly distinguish the Y signal to be implemented.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to display an image device for displaying a screen with an optimized sharpness that can clearly emphasize sharpness without generating noise; The control method is related.

Another object of the present invention is to provide an image device for displaying a screen having an optimized sharpness and a control method thereof, which can prevent a shooting phenomenon that is unnecessary when sharpening is emphasized.

In order to achieve the above object, the present invention provides a method for controlling sharpness of an imaging apparatus, the method comprising: receiving video data, and an amount of change of a Y signal level value of each cell constituting the applied video data; And a Y signal that is variable in proportion to the amount of change in the Y signal level value of each of the cells calculated in the filtering procedure for adjusting sharpness of the applied video data. It provides a control method of an image device for displaying a screen with an optimized sharpness, characterized in that it comprises the step of determining the weight of the level value.

Computing the amount of change in the Y signal level value of each cell constituting the applied video data, the first difference value of the Y signal level between the particular cell and two cells adjacent to the particular cell is detected; And setting the difference value between the detected first difference values as a second difference value, and determining the set second difference value as a change amount of the Y signal level value of the specific cell. It can be done including the step.

Computing the amount of change of the Y signal level value of each cell constituting the applied video data, the result of the second derivative of the Y signal level value with respect to the position of the specific cell, And determining the amount of change in the Y signal level value.

In a filtering procedure for adjusting the sharpness of the applied video data, a weighting degree of a variable Y signal level value is determined in proportion to an amount of change of a Y signal level value of each of the calculated cells. The step of multiplying, when the amount of change of the Y signal level value is less than M (detail reference value), multiplies a first weight constant by the Y signal level value, or the amount of change of the Y signal level value is M ( more than the detail reference value) and less than N (edge reference value), multiplying the second signal constant greater than the first weight constant by the Y signal level value, or the amount of change in the Y signal level value N In case of exceeding the edge reference value, at least one of multiplying a third weight constant greater than the second weight constant by the Y signal level value may be included.

In order to achieve the above object, the present invention provides a video device for controlling sharpness, the input unit for receiving video data and the amount of change of the Y signal level value of each cell constituting the applied video data A Y that is varied in proportion to the amount of change in the Y signal level of each of the calculated cells in a filtering procedure that calculates a C and a sharpening of the applied video data. It provides a video device for displaying a screen of optimized clarity, characterized in that it comprises a control unit for determining the degree of weight of the signal level value.

The calculator detects first difference values of a Y signal level between a specific cell and two cells adjacent to the specific cell, and converts the difference between the detected first difference values as a second difference value. The set second difference value may be determined as a change amount of the Y signal level value of the specific cell.

The imaging apparatus may further include a memory unit which pre-stores data on a weighting degree of the Y signal level value determined in proportion to the change amount of the Y signal level value.

Therefore, according to the present invention, it is possible to reduce the noise portion of the screen as much as possible, and at the same time, to emphasize the peaking of the edge portion clearly.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

3 is a block diagram illustrating a configuration of an imaging apparatus displaying a screen having an optimized sharpness according to the present invention.

4 is a block diagram (block diagram) showing the configuration of an image data adjusting unit of an imaging apparatus displaying a screen having an optimized sharpness according to the present invention.

3 to 4, an embodiment in which an imaging device according to the present invention implements a screen having an optimized sharpness will be described below.

As shown in FIG. 3, the video device 300 according to the present invention includes an A / D converter 310, a decoder 320, and an A / D converter. 330, a scaler 340, an image data adjusting unit 350, a display module 360, and the like.

The imaging device 300 may be, for example, a television, a PC monitor, a mobile phone, or the like.

The A / D converter 310 receives RGB video data from a PC or the like and converts the RGB video data into a digital signal.

The decoder 320 receives and decodes video data of an NTSC / PAL broadcast signal.

The National Television System Committee (NTSC), which defines the video standard for US color television, specifies that composite video signals have 60 screen refresh rates per second, each screen having 525 lines and 16 million colors. It could be included.

The PAL (Phase Alternation by Line system) is a color television system developed by Telefunken Co., Ltd., and information about color and saturation is modulated and transmitted with a phase difference of 90 °, and one of the two modulations is a line. Transmit phase by 180 ° from to line.

The A / D converter 330 receives YCbCr video data of a high definition broadcast and converts it into a digital signal.

The scaler 340 is a signal such that video data applied through the A / D converter 310, the decoder 320, the A / D converter 330, and the like can be output from the display module 360. It is in charge of processing.

The display module 360 may be, for example, a liquid crystal display (LCD) module, a plasma display panel (PDP) module, or the like.

The image data adjusting unit 350 is a chip that adjusts detailed information related to image quality, and includes edge enhancement, color enhancement, contrast enhancement, color compensation, and the like. Performs the function of.

In particular, there is one feature in the image data adjusting unit 350 that adjusts sharpness in relation to the present invention. FIG. 4 will further illustrate the image data adjusting unit 350 according to the present invention.

As shown in FIG. 4, the image data adjusting unit 350 according to the present invention includes a filter unit 351, a Y signal variation calculator 352, a Y signal value weighting unit 353, and a limiter. ) 354, the control unit 355, the memory unit 356, and the like.

However, the image data adjusting unit 350 shown in FIG. 4 is illustrated in the center of a block for adjusting sharpness in relation to the present invention, and a part of the image data adjusting unit 350 relatively unrelated to the present invention is not shown.

However, those skilled in the art can easily understand the present invention despite such omission.

The filter unit 351 may emphasize horizontal and vertical edges of the video data to be applied using, for example, a 3 × 13 or 5 × 7 FIR filter, or the like. noise and excessive peaking can be controlled to adjust the degree of roughness of the image.

However, in the present invention, the Y-signal change amount calculating unit 352, the Y-signal value weighting unit 353, the limiter 354, and the like are added to the secondary Y-pixels. One feature is to display a clearer and clearer image by controlling peaking using signal differential values and the like.

The operations of the Y signal variation calculator 352, the Y signal value weighting unit 353, the limiter 354, and the like will be described in more detail with reference to FIGS. 5 to 7.

5 is a diagram illustrating data of a Y signal level value for each cell according to the present invention.

FIG. 6 is a diagram illustrating data about a change amount of a Y signal level value obtained through the data of FIG. 5.

7 is a diagram illustrating a table that defines a degree of weight that varies depending on the amount of change in the Y signal level value according to the present invention.

Hereinafter, a process of applying weights to different levels of the Y signal level value according to the amount of change in the Y signal level value of each cell will be described with reference to FIGS. 4 to 7.

First, the Y signal change calculator 352 acquires a Y signal level value of a cell for each position of video data to be applied. The obtained result value may be shown, for example, as shown in FIG. 5.

At this time, the Y signal change amount calculator 352 calculates the amount of change in the Y signal level value of each cell.

As a method of calculating the change amount of the Y signal level value of each cell, for example, there is a method using the first derivative or the second derivative result value of the Y level value according to the position of each cell.

Alternatively, as illustrated in FIG. 6, there is a method of comparing the Y signal level values of the left and right cells adjacent to a specific cell and obtaining the difference value. At this time, one cell has two difference values A for left and right cells.

That is, one cell has two A data, and again, one data, B, is calculated using the difference between the two A data.

Based on the B data calculated as described above, the degree of weight for each cell is determined in a filtering procedure for adjusting sharpness.

Thus, the Y signal value weighting unit 353 is responsible for determining the degree of the weight.

The memory unit 356 stores N, M, p, q, and r data values to be described later.

The memory unit 356 may use, for example, a hard disk drive (HDD), a memory card, or the like.

The control unit 355 may include the filter unit 351, the Y signal variation calculator 352, the Y signal value weighting unit 353, the limiter 354, the memory unit 356, and the like. It plays a role in controlling the overall operation of.

Based on the B data, the degree of weight that varies for each cell may be determined, for example, as shown in FIG. 7.

In other words, when the B data value is less than M, the numerical value r of the smallest weight is multiplied by the Y signal level value.

On the other hand, when the B data value is M or more and less than N, the numerical value q of the intermediate weight is multiplied by the Y signal level value.

When the B data value exceeds N, the numerical value p of the largest weight is multiplied by the Y signal level value.

Of course, the design is divided into three stages in FIG. 7, but may be designed by dividing into different numerical stages, or may be designed such that the weight is directly changed in proportion to each B data value.

As described above, it is a feature of the present invention to increase the weight of the Y signal to be filtered in proportion to the change of the B data value, that is, the Y signal level value of each cell.

Conventionally, a passive filter in which the weight of the Y signal does not change at all is used.

The reason why the weight of the Y signal to be filtered is increased in proportion to the B data value is that the B data value is large because the corresponding cell corresponds to an edge part.

Therefore, the cell corresponding to the edge is set to give more weight because the sharpness becomes better as the difference between the Y signal level values increases.

On the other hand, since the B data value is small, since the corresponding cell corresponds to detail or noise, it is designed to reduce the weight.

After the Y signal value weighting unit 353 determines a weight, the limiter 354 may be configured to determine local maximum and local minimum values of the original image (hereinafter, Lmin) to prevent over / under shoot. , Lmax), to control the peaking (peaking).

If the peaking limit is limited to Lmin and Lmax, the sharpness may be felt small, so that Lmin and Lmax may be adjusted by adjusting the LMMGN register value.

Therefore, when the image data adjusting unit 350 according to the present invention is introduced, the edge and the detail part are detected, the weight is set high, and the noise part is the weight. It is possible to set less.

In addition, the Y signal level value is detected, the amount of change in each cell is calculated, and different weights are applied according to the calculation result, thereby achieving dynamic sharpness.

8 is a diagram illustrating an example of a filtering procedure for adjusting sharpness of video data according to the present invention.

9 illustrates another example of a filtering procedure for adjusting sharpness of video data according to the present invention.

When the above-described image data adjusting unit 350 is introduced, an active filter can be implemented. As shown in FIGS. 8 and 9, different weights are assigned according to the change of the Y signal level value, thereby providing sharper sharpness. While realizing the screen of, the noise can be minimized.

As shown in FIG. 8, when the amount of change in the Y signal level value is large, the weight is set relatively large in the filtering process for adjusting the sharpness.

On the other hand, as shown in Figure 9, when the amount of change in the Y signal level value is small, the weight is set relatively small in the filtering process for adjusting the sharpness.

10 is a flowchart (flow chart) illustrating a control method of an image device displaying a screen having an optimized sharpness according to the present invention.

Hereinafter, a method of displaying an optimized sharpness screen by the imaging apparatus according to the present invention will be described with reference to FIG. 10.

However, the control method to be described later, since the description of the above-described Figs. 1 to 9 are described sequentially in the order of time, detailed description thereof will be omitted.

However, those skilled in the art can easily understand the embodiment through the above description of FIGS. 1 to 9.

The video apparatus first detects a Y signal level value of each cell of video data to be applied (S1001).

The derivative value A of the Y signal level value between the cells is calculated (S1002). For example, two A data values can be obtained for left and right derivatives.

A difference value B between two A data values of one cell is calculated (S1003).

P, q, r, which are weight-related constants for the Y signal level value, and N, M data values to determine the degree of weight are previously set and stored in memory, etc. S1004).

It is determined whether the B data falls within a range in relation to the N (edge reference value) and M (detail reference value) (S1005).

When the B data value exceeds N, p, the largest weight constant, is multiplied by the Y signal level value (S1006).

On the other hand, when the B data value is M or more and N or less, the Y signal level value is multiplied by q, which is an intermediate weight constant (S1007).

When the B data value is less than M, the Y signal level value is multiplied by r, which is the smallest weight constant (S1008).

The present invention is not limited to the above-described embodiments, and as can be seen in the appended claims, modifications can be made by those skilled in the art to which the invention pertains, and such modifications are within the scope of the present invention.

And, the above-mentioned numerical value is a preferred embodiment or merely an example, the scope of the present invention is not limited to the numerical values, and as can be seen in the appended claims, Modifications are possible by those skilled in the art and such modifications are within the scope of the present invention.

The effects of an image device displaying a screen of optimized sharpness and a control method thereof according to the present invention described above will be described below.

First, according to the present invention, there is an effect that can sharply emphasize sharpness without generating noise.

Secondly, according to the present invention, there is an effect that can prevent the shooting (shooting) phenomenon that occurs unnecessarily during the emphasis on sharpness.

Claims (7)

In the sharpness control method of the video device, Receiving video data; Calculating a change amount of a Y signal level value of each cell constituting the applied video data; And In a filtering procedure for adjusting the sharpness of the applied video data, a weighting degree of a variable Y signal level value is determined in proportion to an amount of change of a Y signal level value of each of the calculated cells. Control method of a video device to display a screen of optimized clarity, characterized in that it comprises the step of. The method of claim 1, Computing the amount of change of the Y signal level value of each cell constituting the applied video data, Detecting first difference values of a Y signal level between a particular cell and two cells adjacent to the particular cell; Setting a difference value between the detected first difference values as a second difference value; And And determining the set second difference value as a change amount of the Y signal level value of the specific cell. The method of claim 1, Computing the amount of change of the Y signal level value of each cell constituting the applied video data, And determining a result of the second derivative of the Y signal level value with respect to the position of the specific cell as a change amount of the Y signal level value of the specific cell. Control method of the video device. The method of claim 1, In a filtering procedure for adjusting the sharpness of the applied video data, a weighting degree of a variable Y signal level value is determined in proportion to an amount of change of a Y signal level value of each of the calculated cells. The steps are Multiplying the first weight constant by the Y signal level value when the amount of change in the Y signal level value is less than M (detail reference value); Multiplying the Y signal level by a second weight constant greater than the first weight constant when the amount of change in the Y signal level value is equal to or greater than M (detail reference value) and equal to or less than N (edge reference value); or At least one of multiplying the Y signal level by a third weight constant greater than the second weight constant when the amount of change in the Y signal level is greater than N (edge reference value); Control method of the video device to display the screen of the optimized sharpness, characterized in that made. In a video device that controls sharpness, An input unit receiving video data; A calculation unit calculating a change amount of a Y signal level value of each cell constituting the applied video data; And In a filtering procedure for adjusting the sharpness of the applied video data, a weighting degree of a variable Y signal level value is determined in proportion to an amount of change of a Y signal level value of each of the calculated cells. An image device for displaying a screen of optimized clarity, characterized in that it comprises a control unit. The method of claim 5, The calculation unit, Detect first difference values of a Y signal level between a particular cell and two cells adjacent to the particular cell, set a difference between the detected first difference values as a second difference value, and And determining the set second difference value as a change amount of a Y signal level value of the specific cell. The method of claim 5, The video device, And a memory unit which pre-stores data on a weighting degree of the Y signal level value determined in proportion to the change amount of the Y signal level value.

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