KR20080076053A - Apparatus for osd size conversion - Google Patents

Abstract

An apparatus for converting an OSD(On Screen Display) size is provided to scale the OSD bit map image data vertically and to scale the vertically scaled image data horizontally for controlling the size of the OSD bit map image data efficiently. An apparatus for converting an OSD(On Screen Display) size comprises an OSD size control part(500), a memory control part(504), first and second line memories(510,512), a line memory control part(508), and a vertical scaler(514). The OSD size control part determines a vertical scaling mode of the OSD bit map image data stored in a memory(502) as one of UP, DOWN, and NON scaling modes. The memory control part reads the OSD bit map image data stored in the memory and inputs the OSD bit map image data in an FIFO(First In First Out)(506). The line memory control part stores the image data buffered in the FIFO in the first or second memory. The vertical scaler scales the OSD bit map image data vertically, using the image data stored in the first and second line memories. A horizontal scaler(516) up-scales the vertically scaled image data horizontally.

Description

OSD size converter {APPARATUS FOR OSD SIZE CONVERSION}

1 is a view showing the configuration of a conventional OSD device,

2 is a diagram illustrating an example of performing upscaling in a vertical scaler;

3 is a diagram illustrating an example of performing down scaling in a vertical scaler;

4 is a diagram illustrating the operation of a vertical scaler when performing an anti-flicker function.

5 is a diagram showing the configuration of an OSD size converting apparatus according to the present invention; and

FIG. 6 is a diagram illustrating an OSD bitmap image data storing method according to a vertical scaling mode of an LM controller.

* Explanation of symbols for main parts of the drawings

500: OSD size control unit 502: memory

504: Memory control unit 506: FIFO

508: LM control unit 510: first LM

512: second LM 514: vertical scaler

516: horizontal scaler

The present invention relates to an OSD (On Screen Display) size conversion device, OSD size conversion having an operating mode of up scaling, down scaling, or non-scaling in the vertical direction of the OSD bitmap image. It's about the device.

On-Screen Display (OSD) device displays a menu on the screen to receive user setting information for adjusting the display output characteristics of the display device such as brightness, contrast, and color in display devices such as LCD, PDP, and CRT. Is used. Thus, when the OSD device reads the OSD bitmap image signal stored in the memory and outputs the image on the screen, the OSD device blends the OSD bitmap image signal into a video signal to be output on the screen.

1 is a view showing the configuration of a conventional OSD device.

The memory controller 102 sequentially reads the OSD bitmap image data stored in the memory 100 and buffers them in the first in first out (FIFO) 104.

The pixel format converter 106 converts the pixel format of the OSD bitmap image data into 32 bit per pixel (bpp). Since the OSD bitmap image data stored in the memory 100 may have a pixel format of 8bpp, 16bpp, or 24bpp in order to save the storage space and memory bandwidth of the memory 100, the pixel format converter 106 ) Uses a palette 108 of 256 * 32 size, and converts it into a real color of 32bpp when an indexed color of 8bpp is input.

The color space conversion unit (CSC) 110 blends the 32 bpp (bit per pixel) ARGB (alpha value + RGB) or AYCbCr (alpha value + YCbCr) pixel value output from the pixel format conversion unit 106. The video signal is converted to the same color space as that of the video signal to be output and output.

The synthesizer 112 alpha-blends the 32 bit per pixel (bpp) pixel value output from the color space converter 110 in pixel units and pixel units of the video signal.

The synthesis unit 112 calculates the pixel value of the image to be output by alpha-blending the pixel value of the OSD bitmap image and the pixel value of the video signal in the RGB color space as shown in Equation 1.

The OSD device having such a configuration has a configuration of blending the video signal and the OSD bitmap image data in the final stage before outputting the image. If the video signal has a large resolution, the OSD device has a large resolution that matches the resolution of the video signal. OSD bitmap image data is required.

Accordingly, since the OSD device must store high resolution OSD bitmap image data in the memory, the proportion of one OSD bitmap image data in the memory increases, and also the OSD bitmap image data is stored from the memory for OSD display. The memory bandwidth allocated for reading is increased.

Memory bandwidth is one of the most important resources in DTV System On Chip (SoC). This is because the memory bandwidth is fixed by the operating clock and data line bit-width of the memory, while the number of blocks using the memory increases as the complexity of the SoC increases.

For example, when the operating clock of the memory is 200 MHz and the data line bit width is 128 bits, the total memory bandwidth is 3200 MByte / sec, which is a 200 MHz × 128 bit / 8 value. However, if you need to display one 32bpp OSD bitmap image over the entire screen at 1920 * 1080p (progressive display), 60Hz, you will need 1920 × 1080 × 60 × 32/8 = 497.664 MByte / sec of memory bandwidth. It will use almost 15.5% of the memory bandwidth.

In addition, if two or more OSD bitmap images must be displayed, 31% of the total memory bandwidth is consumed, which monopolizes too much memory bandwidth, seriously limiting the overall SoC implementation.

Therefore, efficient methods for implementing the required functions by accessing the memory a small number of times for each block in the SoC using the memory are being sought, and in particular, the memory bandwidth used to display the OSD bitmap image as described above. Measures to reduce the risk are being sought.

Accordingly, an object of the present invention is an operation mode of up scaling, down scaling, or non-scaling in a vertical direction with respect to an OSD bitmap image that can be used in an OSD device as a part of the above. It is to provide an OSD size conversion device having a.

In order to achieve the above object, the OSD size converting apparatus according to the present invention includes a vertical scaling mode for an OSD bitmap image data stored in a memory according to an input vertical scale ratio and a video scanning method. An OSD size control unit that determines either one of a down scaling mode and a non scaling mode; A memory controller configured to read OSD bitmap image data stored in the memory and input the first bit in first in first out (FIFO) according to the vertical scaling mode determined by the OSD size controller; A first line memory (LM) and a second line memory; A line memory controller configured to store image data buffered in the FIFO in the first line memory or the second line memory according to the vertical scaling mode determined by the OSD size controller; And a vertical scaler for scaling the OSD bitmap image data in a vertical direction by using image data stored in the first line memory and the second line memory according to the vertical scale ratio and a video scan method.

And a horizontal scaler for upscaling the image data scaled in the vertical direction from the vertical scaler in the horizontal direction.

In the present invention, when the vertical scaling mode determined by the OSD size control unit is an upscaling mode, the memory controller reads nth horizontal line data of the OSD bitmap image data stored in the memory and then n + 1th horizontal line data. Read and input to the first in first out (FIFO), and when the vertical scaling mode determined by the OSD size control is the up-scaling mode, the first line by the horizontal line of the image data buffered in the FIFO And store in the line memory and the second line memory.

In the present invention, when the vertical scaling mode determined by the OSD size control unit is a non-scaling mode, the memory controller reads all nth horizontal line data of the OSD bitmap image data stored in the memory and then n + 1th horizontal line data. Reads the data into a first in first out (FIFO), and the line memory controller stores image data buffered in the FIFO in the first line memory when the vertical scaling mode determined by the OSD size controller is a non-scaling mode. If there is no storage space in the first line memory, it is stored in the second line memory.

In the present invention, when the vertical scaling mode determined by the OSD size control unit is a downscaling mode, the nth horizontal line and n + of the OSD bitmap image data are read by the data blocks that can be read from the memory at one time. The data of the first horizontal line is alternately read and input to FIFO (First In First Out), and the line memory controller is buffered in the FIFO when the vertical scaling mode determined by the OSD size controller is a down scaling mode. The data may be alternately stored in the first line memory and the second line memory one by one data block.

Hereinafter, with reference to the accompanying drawings will be described the present invention in more detail. However, in describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

2 is a diagram illustrating an example of performing upscaling in a vertical scaler.

Here, the line shown by the solid line means the OSD bitmap image line which is the original image, and the line shown by the dotted line means the image line generated by linear interpolation of the OSD bitmap image line which is the original image, and the vertical scale is the scale ratio. A value of 3 is used to upscale the OSD bitmap image data consisting of four horizontal line data to the OSD bitmap image data consisting of ten horizontal line data.

The point to note in the upscaling of the vertical scaler is the data line in the original image used in the vertical scaler to generate each of the ten horizontal line data.

In the drawing, the line number in the original image used to generate the corresponding image data line is described next to the dotted line and the solid line, and when the video scanning method is a progressive method (hereinafter, referred to as 'P scan method'), It is described in the following order.

(1)-(1,2)-(1,2)-(2)-(2,3)-(2,3)-(3)-(3,4)-(3,4)-(4 )

That is, the vertical scaler generates the nth image data line and the n + 1th image data line when upscaling, and always receives one more image line from the original image and linearly interpolates with the previously provided image line. It can be seen that a new image line is generated through. Therefore, the vertical scaler needs to receive image data of one horizontal image line in the original image as described above to perform upscaling.

The vertical scaler scales the number of horizontal data lines of the original image according to the scale ratio, and the P scan method and the interlace method (hereinafter, referred to as an 'I scan method') according to the video scan method. The image is divided into one image frame or two image frames (top frame and bottom frame).

In other words, the vertical scaler outputs ten horizontal line data generated by scaling the number of horizontal data lines of the original image according to the vertical scale ratio, as shown in the case of the P scan method, as one image frame, and I In the case of the scan method, scaling is performed on five horizontal lines each of which even-numbered image data and odd-numbered image data are separated and output as two image frames.

Accordingly, the vertical scaler is larger than the number of horizontal lines in the original image when the vertical scan ratio is greater than 1 when the video scan method is P scan, and when the vertical scale ratio is larger than 2 when the I scan method is used. Upscaling to output an image having a horizontal line number is provided.

3 is a diagram illustrating an example of performing down scaling in a vertical scaler.

In FIG. 3, as shown in FIG. 2, a solid line indicates an OSD bitmap image line that is an original image, and a line indicated by a dotted line indicates an image line generated by linear interpolation of an OSD bitmap image line that is an original image. it means.

When the video scanning method is P scan method, the vertical scaler displays an image having the number of horizontal lines smaller than the horizontal line number of the original image when the vertical scale ratio is smaller than 1, and when the I scan method is smaller than 2. Provide down scaling to output.

Thus, in FIG. 3, the OSD bitmap image data composed of four horizontal line data is scaled using a vertical scale ratio of 3/4 in the P scan method, and the vertical scale ratio is 3/3 in the I scan method. The OSD bitmap image data is scaled to 2, and the downscaled point is a data line in the original image used by the vertical scaler to generate the downscaled horizontal image lines, respectively. .

Accordingly, a case in which downscaling is performed by the P scan method is described in the following order.

(1)-(2,3)-(4)

In the case where downscaling is performed by the I scan method, the following description is made in the following order in the top frame.

(1)-(2,3)-(3,4)

That is, when the downscaler performs the downscaling, unlike the upscaling as shown through FIG. 2, the vertical scaler does not use the horizontal line data (1) of the original image previously provided in the original image. Although the image data (2, 3) of the two horizontal lines should be provided, there is a case where downscaling can be provided.

FIG. 4 is a diagram illustrating the operation of a vertical scaler when performing an anti-flicker function.

When the image signal is scanned on the screen by the I scan method, a phenomenon in which the image horizontal lines are periodically vibrated on the screen periodically, that is, a flicker phenomenon occurs. Thus, the anti-flicker function that prevents this generates new horizontal line data consisting of the average value of consecutive nth horizontal line data and n + 1th horizontal line data, thereby generating a top frame and a bottom frame as shown. .

Accordingly, when performing the anti-flicker function, the vertical scaler should be provided with two horizontal line data continuous in the original image as follows.

In other words, the vertical scaler creates the image line in the top frame and the vertical scaler creates the data lines in the original image by (1,2)-(3,4)-(5,6)-.. Must receive the data lines in the original image, two lines such as (2,3)-(4,5)-(6 ,.).

The present invention proposes an OSD size conversion apparatus having an operation mode of up scaling, down scaling, or non-scaling in a vertical direction with respect to an OSD bitmap image. As described above, the present invention proposes an OSD size converting apparatus configured to perform vertical scaling on an OSD bitmap image more effectively in performing upscaling, downscaling, or anti-flicker in a vertical scaler.

Fig. 5 shows the configuration of the OSD size converting apparatus according to the present invention, and the OSD size converting apparatus includes an OSD size controlling unit 500, a memory 502, a memory controlling unit 504, a FIFO 506 and And a first line memory (hereinafter referred to as LM) 510 and a second LM 512, an LM controller 508, a vertical scaler 514, and a horizontal scaler 516. .

The OSD size control unit 500 receives information about a vertical scale ratio of the OSD bitmap image and a video scan method (I scan method or P scan method) as scaling information from the outside, and the OSD bitmap image through the received information. The vertical scaling mode of is determined as one of three operating modes: UP scaling, DOWN scaling, and non-scaling.

As described above, the vertical scaling mode of the OSD size control unit 500 is determined by the scaling operation method of the vertical scalers of FIGS. 2 and 3. When the video scanning method is the P scan method, the vertical scale ratio of the OSD bitmap image is increased. If the vertical scale ratio is larger than 1 and the video scan method is I scan method, the upscaling mode is determined.

When the video scan method is the P scan method, the downscale mode is determined when the vertical scale ratio of the OSD bitmap image is less than 1, and when the video scan method is the I scan method, the vertical scale ratio is less than 2.

Finally, the OSD size control unit 500 may enter the non-scaling mode when the vertical scale ratio of the OSD bitmap image is 1 when the video scan method is the P scan method and the vertical scale ratio is 2 when the video scan method is the I scan method. Decide

The OSD size control unit 500 controls the size of the memory control unit 504, the LM control unit 508, and the vertical scaler 514 according to the vertical scaling mode determined by the input video scan method and the vertical scale ratio of the OSD bitmap image. To control the operation.

In addition, the OSD size control unit 500 controls the operations of the memory control unit 504, the LM control unit 508, and the vertical scaler 514 to perform the anti-flicker function when a user requests an anti-flicker function.

The memory 502 stores OSD bitmap image data.

The memory controller 504 reads all the data of the n th horizontal line in the image from the OSD bitmap image data stored in the memory 502 according to the vertical scaling mode determined by the OSD size controller 500, and then the n + 1 th horizontal line. The data of the nth horizontal line and the n + 1th horizontal line in the image by the data block which can be read at the same time or the data block can be read from the memory 502 at once and output to the FIFO 506. Let's do it.

When the user requests an anti-flicker function, the memory controller 504 controls the nth horizontal line and n in the image by data blocks that can be read from the memory 502 at once according to the control of the OSD size controller 500. The data of the + 1th horizontal line is alternately read and output to the FIFO 506.

The FIFO 506 buffers the OSD bitmap image data that the memory controller 504 reads from the memory 502 and outputs.

The LM controller 508 stores the OSD bitmap image data buffered in the FIFO 506 in the first LM 510 or the second LM 512 according to the vertical scaling mode determined by the OSD size controller 500. The OSD bitmap image data stored in the first LM 510 and the second LM 512 is provided to the vertical scaler 514.

Here, the LM controller 508 stores the OSD bitmap image data buffered in the FIFO 506 in the first LM 510 or the second LM 512 according to the vertical scaling mode determined by the OSD size controller 500. The method is associated with a method of reading image data from the memory 502 of the memory controller 504, as shown in FIG. 6.

FIG. 6 is a diagram illustrating an OSD bitmap image data storing method according to a vertical scaling mode of an LM controller.

As described above with reference to FIG. 2, when upscaling is performed in the vertical scaler 514, data of one horizontal line in the original image should be provided. Therefore, when the vertical scaling mode determined by the OSD size control unit 500 is the upscaling mode, the LM control unit 508 stores data of one horizontal line of the OSD bitmap image buffered in the FIFO 506 (first LM (LM1) ( After all the data is stored in the 510, the data of the next horizontal line is stored in the second LM LM2 512.

The LM controller 508 sequentially stores the FIFO 506 buffered OSD bitmap image data in the first LM 510 when the vertical scaling mode determined by the OSD size controller 500 is the non-scaling mode. When the storage space of the LM 510 is full, it is stored in the second LM 512. That is, when the vertical scaling mode is the non-scaling mode, the LM controller 508 outputs the input image data without performing the scaling operation in the vertical scaler 514 and provides the image data to the vertical scaler 514. The first LM 510 and the second LM 512 are used as one connected memory.

Finally, as shown in FIGS. 3 and 4, when downscaling is performed in the vertical scaler 514 or when the anti-flicker function is performed, image data of two horizontal lines may be provided from the original image. There is a need. Therefore, the LM controller 508 removes the OSD bitmap image data buffered by the FIFO 506 by one data block when the vertical scaling mode determined by the OSD size controller 500 performs the downscaling mode or the anti-flicker function. The operation of alternately storing the first LM 510 and the second LM 512 is performed.

Thus, depending on whether to perform upscaling, downscaling, nonscaling, or anti-flicker functions, the LM control unit 508, along with the memory control unit 504, can perform the scaling operation of the vertical scaler 514 more quickly. Characterized in that the operation to provide the horizontal line data of the original image.

The vertical scaler 514 receives the information about the vertical scale ratio of the OSD bitmap image and information about a video scan method (I scan method or P scan method) from the OSD size control unit 500 and receives the first LM 510 and the second LM. Upscaling, downscaling, or nonscaling is performed using the OSD bitmap image horizontal line data stored in 512. In addition, the vertical scaler 514 performs image data processing to provide an anti-flicker function under the control of the OSD size control unit 500.

The horizontal scaler 516 upscales the image data processed and output from the vertical scaler 514 in the horizontal direction, where the horizontal scaler 516 performs the upscaling, where the horizontal scaling ratio is a predetermined fixed value. Either or it is a value that is changed from an external input.

The OSD bitmap image data output through the horizontal scaler 516 is converted into the same color space as that of the video signal to be blended, and alpha-blended with the video signal to be output on the screen.

Although the present invention has been described in detail with reference to exemplary embodiments above, those skilled in the art to which the present invention pertains can make various modifications to the above-described embodiments without departing from the scope of the present invention. I will understand. 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.

The present invention provides an OSD size conversion device having an operation mode of up scaling, down scaling, or non-scaling in a vertical direction with respect to an OSD bitmap image. The size of the bitmap image data can be made larger in the vertical direction and output, and can be made smaller or output in the original size.

In addition, the OSD size conversion apparatus according to the present invention provides the horizontal line data of the OSD bitmap image to the vertical scaler according to the method of performing the up-scaling, down-scaling, non-scaling, or anti-flicker function in the vertical scaler. Vertical scaling of the OSD bitmap image data is made more effective.

Claims (6)

The vertical scaling mode for the OSD bitmap image data stored in the memory is determined as one of the up scaling mode, the down scaling mode, and the non scaling mode according to the input vertical scale ratio and the video scanning method. An OSD size control unit; A memory controller configured to read OSD bitmap image data stored in the memory and input the first bit in first in first out (FIFO) according to the vertical scaling mode determined by the OSD size controller; A first line memory (LM) and a second line memory; A line memory controller configured to store image data buffered in the FIFO in the first line memory or the second line memory according to the vertical scaling mode determined by the OSD size controller; And OSD size conversion, comprising: a vertical scaler for scaling the OSD bitmap image data in a vertical direction by using image data stored in the first line memory and the second line memory according to the vertical scale ratio and a video scan method Device. According to claim 1, And a horizontal scaler for up-scaling the image data scaled in the vertical direction from the vertical scaler in a horizontal direction. According to claim 1, The memory controller When the vertical scaling mode determined by the OSD size control unit is an upscaling mode, all nth horizontal line data of the OSD bitmap image data stored in the memory are read, and then n + 1th horizontal line data is read and FIFO (First In) is read. First Out), The line memory controller And when the vertical scaling mode determined by the OSD size control unit is an upscaling mode, the image data buffered in the FIFO in the first line memory and the second line memory. . According to claim 1, The memory controller When the vertical scaling mode determined by the OSD size control unit is a non-scaling mode, all n-th horizontal line data of the OSD bitmap image data stored in the memory are read, and then n + 1-th horizontal line data is read to read FIFO (First In). First Out), The line memory controller When the vertical scaling mode determined by the OSD size control unit is a non-scaling mode, image data buffered in the FIFO is stored in the first line memory, and when there is no storage space in the first line memory, the image data is stored in the second line memory. OSD size conversion device, characterized in that. According to claim 1, The memory controller When the vertical scaling mode determined by the OSD size control unit is a down scaling mode, data of the n th horizontal line and the n + 1 th horizontal line of the OSD bitmap image data are alternated by data blocks that can be read from the memory at one time. Read it into the FIFO (First In First Out), The line memory controller When the vertical scaling mode determined by the OSD size control unit is a down scaling mode, the image data buffered in the FIFO is alternately stored in the first line memory and the second line memory one by one data block. Size converter. The method of claim 5, The memory control unit and the line memory control unit OSD size converting apparatus, characterized in that configured to perform the same operation even when performing the anti-flicker (Anti-Flicker) function.

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