KR100786085B1 - Apparatus and method for film mode detection through deinterlacing and pulldown technique - Google Patents

Abstract

The present invention relates to a film mode detection apparatus and method using a de-interlace and pull-down technique that improves the accuracy and image quality of the detection by using a de-interlace technique and a pull-down technique. The present invention provides a deinterlacing unit for generating a deinterlaced image using line average values of an odd field and an even field; A motion detector for detecting a motion of an image from two or more input fields; And a pull-down film mode detection unit for receiving the deinterlaced image generated by the deinterlace unit to obtain respective image differences, and detecting two fields in one frame through the motion detected by the motion detector. Preferably, the deinterlace portion is a two-dimensional deinterlacer. More preferably, the pull-down film mode detector is a 2: 2 pull-down film mode detector or a 3: 2 pull-down film mode detector. Accordingly, the present invention can apply the two-dimensional deinterlacing technique and use the two-dimensional deinterlacing result as an input to improve the accuracy of the 2: 2 or 3: 2 pull down technique and to improve the image quality of the image.

Deinterlace, Pulldown, Image, Quality, Film Mode, Detection, Motion

Description

Apparatus and Method for detecting a film mode with pull-down detect and de-interlace function}

1 is a diagram illustrating a process of converting a general film image to a 2: 2 pull-down technique.

Figure 2 is a block diagram showing a film mode detection apparatus through a deinterlace and pull-down technique according to the present invention.

3 is a view for explaining a method for detecting a field in a 2: 2 pulldown image of the present invention.

4 is a control flowchart illustrating a film mode detection method through a deinterlace and pulldown technique according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: deinterlacing unit

20: motion detection unit

30: 2: 2 pulldown film mode detector

40: 3: 2 pulldown film mode detector

50: video decoder

The present invention relates to film mode detection, and more particularly, to a film mode detection apparatus and method through a deinterlace and pulldown technique to improve the accuracy by combining the deinterlace technique and the pulldown technique.

Films use a progressive method in which each screen is instantaneously stored in film and stored on the screen at once. In contrast, since a TV basically needs to transmit an image through radio waves, each screen is photographed and transmitted by scanning hundreds of scanning lines again, and the image is also displayed by scanning in a CRT. NTSC (National Television System Committee) color TV systems adopted by the US, Japan, and Korea use 30 sheets per second for a scanning line of 525 lines per screen, and PAL (Phase Alternation Line) schemes adopted in Europe, etc. Sequential Couleur a Memoire transfers 25 copies per second on 625 lines.

In addition, a TV uses a so-called interlaced scanning method in which one screen (frame) is alternately scanned into two fields to alternately scan a video using a limited scanning line. In this case, each of the divided fields may be a top field / bottom field, an odd field / even field, an upper field / lower field, or the like. It is called. Therefore, the NTSC method processes images at 60 fields per second and PAL or SECAM methods 50 fields per second.

When a movie is aired on TV, it is scanned and sent one by one through a converter called telecine (a combination of television and cinema). In this case, when transmitting to a TV of PAL or SECAM type, 50 fields must be obtained from 25 screens (frames), so two fields are obtained for each frame. In this way, a method of scanning two fields for each frame is called a "2: 2 pulldown" method.

PAL or SECAM TVs must reverse 2: 2 pulldown to restore each transmitted field back to progressive mode. The most important thing in this de-interlacing task is to properly recognize the 2: 2 pulldown sequence.

FIG. 1 is a diagram illustrating a process of converting a general film image into a 2: 2 pull-down technique.

As shown, in order to convert a 24 hz film image into a 50 hz image, two fields should be created in one frame and two fields in one frame. The 2: 2 pulldown is a technique to find a field belonging to the same frame and reframe it using the above characteristics. Detecting two fields in one frame is an important part of the 2: 2 pulldown technique.

However, such a conventional pull-down technique obtains a difference between the degree of movement between fields and the degree of movement between frames, and detects whether two fields belong to one frame or field image as a ratio of the movement degree. The lower line and the upper la are predicted by human interpolation, and based on this, motion information is extracted between fields. However, the simple interpolation between the lower line and the upper line has a lot of inaccurate information, which makes it difficult to obtain accurate motion information.

Accordingly, the present invention is to solve the above-mentioned conventional problems, a film mode detection apparatus using a de-interlace and pull-down technique that improves the accuracy and image quality of detection by using a de-interlace technique and a pull-down technique and The purpose is to provide a method.

According to an aspect of the present invention, there is provided a film mode detection apparatus using a deinterlace and pull-down technique, including: a deinterlace unit configured to generate a deinterlaced image using line average values of an odd field and an even field; A motion detector for detecting a motion of an image from two or more input fields; And a pull-down film mode detection unit for receiving the deinterlaced image generated by the deinterlace unit to obtain respective image differences, and detecting two fields in one frame through the motion detected by the motion detector.

Preferably, the deinterlace portion is a two-dimensional deinterlacer. More preferably, the pull-down film mode detector is a 2: 2 pull-down film mode detector or a 3: 2 pull-down film mode detector.

In addition, the film mode detection method using the deinterlace and pull-down technique according to the present invention, the deinterlacing step of generating a deinterlaced image using the line average value of the odd field and even field; A motion detection step of detecting a motion of an image from two or more input fields; And a pull-down film mode detecting step of receiving the deinterlaced image generated by the deinterlacing unit, obtaining respective image differences, and detecting two fields as one frame through the movement detected by the motion detecting unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram illustrating a film mode detection apparatus through a deinterlace and pulldown technique according to the present invention.

As shown, the present invention includes a deinterlace unit 10, a motion detector 20, a 2: 2 pulldown film mode detector 30, a 3: 2 pulldown film mode detector 40, and a video decoder 50.

The deinterlacing unit 20 generates a deinterlaced image by using line average values of the odd field and the even field.

The motion detector 30 detects the motion of the image from two or more input fields.

The pull-down film mode detectors 30 and 40 receive the deinterlaced images generated by the deinterlaced unit 20 to obtain respective image differences, and obtain two fields by one frame through the motion detected by the motion detector 30. Detects with

Here, the deinterlace unit 20 is preferably a two-dimensional deinterlacer. The pull-down film mode detector 30 and 40 is more preferably a 2: 2 pull-down film mode detector or a 3: 2 pull-down film mode detector.

3 is a view for explaining a method of detecting a field in a 2: 2 pulldown image of the present invention.

As shown, a characteristic of a 2: 2 pull-down image is that two fields constitute one frame. In the present invention, field pairs are detected by using no motion between fields belonging to the same frame.

If f1 and f2 are fields belonging to the same frame, there is no temporal movement between the two fields. Since f2 and f3 are different frames, there is a motion between the two fields. And the motion of f2 and f3 is similar to the motion of f1 and f3. Using this point, the following formula can be used to more accurately and stably detect field pairs.

In the present invention, in order to find the difference between the even field and the odd field, a new pixel image is made by using an average value between the lines.

4 is a control flowchart illustrating a film mode detection method through a deinterlace and pulldown technique according to the present invention.

As shown, the method of the present invention is composed of a de-interlace step (S200), a motion detection step (S210) and a pull-down film mode detection step (S220 ~ S230).

In the deinterlacing step (S200), a deinterlaced image is generated using line average values of the odd field and the even field. At this time, the deinterlace step performs two-dimensional deinterlacing.

Thereafter, the motion detection step (S210) detects the movement of the image from two or more input fields.

Subsequently, in the pull-down film mode detection steps S220 to S230, deinterlaced images generated in the deinterlacing step are received to obtain respective image differences, and two fields are detected as one frame through the motion detected from the motion detection step. .

Here, the pull-down film mode detection step may be a 2: 2 pulldown film mode detection technique or a 3: 2 pulldown film mode detection technique.

At this time, the 3: 2 pulldown process converts two 24Hz frames into five 60Hz fields, repeating one field in the first frame to create three fields, and two fields in the second frame. It is structured.

In addition, the 2: 2 pulldown process creates two fields in one frame and two fields in the next frame in order to convert a 24hz film image into a 50hz image.

Accordingly, the present invention can apply the two-dimensional deinterlacing technique and use the two-dimensional deinterlacing result as an input to improve the accuracy of the 2: 2 or 3: 2 pull down technique and to improve the image quality of the image.

The present invention described above can be applied not only to flat panel display devices such as PDPs and LCDs, but also to projection TVs, general TVs, monitors, and other video devices, and can be equally applied to analog TVs, digital TVs, and satellite TVs. . In addition, it can of course be applied to all NTSC, PAL, SECAM method.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the above-described embodiments, and the present invention is not limited to the above-described embodiments without departing from the spirit of the present invention as claimed in the claims. Anyone skilled in the art can, of course, make various changes and make such changes as fall within the stated claims.

As described above, according to the apparatus and method for detecting a film mode through the deinterlace and pulldown method according to the present invention, the problem in the process of finding two fields belonging to the same frame in the conventional 2: 2 pulldown method, that is, simply The interpolation between the line and the upper line has a lot of inaccurate information, which makes it difficult to obtain accurate motion information. Thus, the present invention applies the two-dimensional deinterlacing technique to correct the accuracy of the 2: 2 or 3: 2 pulldown technique. In addition to improving the quality of the image is also effective.

Claims (8)

A deinterlacing unit generating a deinterlaced image by using line average values of an odd field and an even field; In the film mode detection device comprising a motion detection unit for detecting the movement of the image from two or more input fields, A de-interlace and pull-down unit comprising a pull-down film mode detection unit for receiving the de-interlaced image generated by the de-interlace unit to obtain respective image differences, and detecting two fields in one frame through the motion detected by the motion detector. Film mode detection device through the technique. The method of claim 1, And the deinterlace unit is a two-dimensional deinterlacer. The method of claim 1, And the pull-down film mode detector is a 2: 2 pull-down film mode detector. The method of claim 1, And the pull-down film mode detector is a 3: 2 pull-down film mode detector. A deinterlacing step of generating a deinterlaced image using line average values of an odd field and an even field; In the film mode detection method comprising a motion detection step of detecting the motion of the image from two or more input fields, And a pull-down film mode detection step of detecting each image difference by receiving the deinterlaced image generated in the deinterlacing step, and detecting two fields in one frame through the motion detected from the motion detecting step. And a film mode detection method through a pull down technique. The method of claim 5, The deinterlacing step is a film mode detection method using a deinterlace and pull-down technique, characterized in that for performing two-dimensional deinterlacing. The method of claim 5, The pull-down film mode detection step is a 2: 2 pull-down film mode detection method, characterized in that the film mode detection method using a deinterlace and pull-down technique. The method of claim 5, The pull-down film mode detection step is a 3: 2 pull-down film mode detection method, characterized in that the film mode detection method using the de-interlace and pull-down technique.

Images