KR100933171B1 - Non-memory semiconductor embodied graphic display function - Google Patents

Abstract

PURPOSE: A non-memory semiconductor for realizing a graphic display function is provided to reduce the manufacturing cost by mounting a graphic interface function in a non-memory. CONSTITUTION: An RTC(Real Time Clock) controller notifies and maintains a graphic display control unit of time information. A DMA(Direct Memory Access) controller directly controls cases that the second video signal, passing through the graphic display control unit, is stored in or withdrawn from an external memory. To convert the second video signal, selectively outputted from the DMA controller, into a signal complying with one of the NTSC(National Television System Committee) and PAL(Phase-Alternating Line), a synchronous signal generator adds a reference signal to the second video signal.

Description

Non-memory semiconductor with graphic display function {NON-MEMORY SEMICONDUCTOR EMBODIED GRAPHIC DISPLAY FUNCTION}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-memory semiconductor that implements a graphic display function. More specifically, the present invention relates to a non-memory semiconductor device that can add a graphic user interface function to a video door phone serving as a server of a home network system. It relates to a semiconductor.

In the past, interphones and black-and-white CRT products have become the mainstream of video door phones, but recently, with the development of electronic industry and network technologies such as semiconductors, the video door phones with simple functions have various functions such as internet, multimedia, By incorporating security and home appliance control functions, the field of application is expanding to the home network system field. This home network system field belongs to one of the next generation growth drivers (ten national policy initiatives), and the video door phone serves as a server of the system. User interface functionality is essential for this.

However, in the related art, in order to have a graphic user interface function and a video signal conversion function, a video door phone has a problem of using a separate chip or device for performing such a function, or in performing a main CPU resource. There is a problem that must be consumed a lot.

The present invention has been made to solve the above problems of the prior art, and adds a graphic display function and a video signal conversion function to one chip, and requires a minimum of resources of the CPU for transmitting control signals The purpose of the present invention is to provide a non-memory semiconductor that implements a graphic display function that can reduce manufacturing costs and improve the overall performance of a home network system by improving the efficiency of signal processing.

In order to achieve the above object, the present invention includes a digital video signal input unit for receiving and outputting a digital video signal output from the video decoder; A low pass filter for low-pass image blurring of the first image signal of the digital image signal input unit; An image scaler for adjusting a resolution of the first image signal passed through the low pass filter; A graphic display controller for overlaying graphic data on the first image signal that has passed through the image scaler; A time information controller (RTC: Real Time Clock) for informing and maintaining time information to the graphic display controller; A direct memory access control unit (DMA) for directly controlling the storage or retrieval of the second image signal passed through the graphic display control unit in an external memory; The second video signal selectively output from the direct memory access controller may be converted into a signal according to any one of an analog system standard such as a National Television System Committee (NTSC) and a phase-alternating line (PAL). A synchronization signal generator for adding a reference signal; A digital video signal output unit for outputting a third video signal through the synchronous signal generator to the outside; And a video encoder for converting and outputting a third video signal of the digital video signal output unit to an analog signal.

The direct memory access controller may include controlling a removable disk controller for controlling a secure digital card, a nonvolatile memory controller for controlling a nonvolatile memory, and a volatile memory controller for controlling a volatile memory. It features.

In addition, the second image signal output from the graphic display control unit is compressed through an image compression unit according to a still image data compression method (JPEG) and a moving image data compression method (Motion JPEG), and then output to the direct memory access control unit and then to an SD card. And compressed data stored in one or more of a nonvolatile memory and a volatile memory, and the compressed data selected by the direct memory access control unit is restored to raw data through an image restoring unit, and then through the graphic display control unit. It is characterized in that the output to the generator.

The graphic display controller may further include a second video signal.

Y = 0.299R + 0.587G + 0.114B (Equation 1)

Cb = -0.172R-0.339G + 0.511B + 128 (Equation 2)

Cr = 0.511R-0.428G-0.083B + 128 (Equation 3)

In the YCbCr data format according to equations 1 to 3, stored in at least one of an SD card, a nonvolatile memory, and a volatile memory selected by the direct memory access control unit.

R = Y + 1.371 (Cr-128) (Equation 4)

G = Y-0.698 (Cr-128)-0.336 (Cb-128) (Equation 5)

B = Y + 1.732 (Cb-128) (Equation 6)

According to the equations 4 to 6 characterized in that it further comprises a graphics converter for converting the output to the RGB data format.

In addition, the direct memory access controller may control the second image signal stored in the SD card, the nonvolatile memory, or the volatile memory to the horizontal and vertical sizes (H, V) of the screen on which the second image signal is to be expressed, and the horizontal and vertical values of the graphic data. It is characterized by displaying using the size (h1, v1), the starting point coordinates (START_X, START_Y) and the offset (offset = H-h1-START_X).

In addition, the digital image signal input unit determines whether the digital image signal output from the video decoder is based on an interlaced scanning method or a sequential scanning method according to a signal transmitted from the outside, and determines the scanning method of the third image signal to be output. The scanning method converts the digital image signal of the interlaced scanning method or the progressive scanning method as it is or according to the scanning method of the third image signal confirmed by the scanning method determining unit, or converts the digital image signal into a sequential scanning method or an interlaced scanning method. In addition, the direct memory access controller may further include a register unit configured to store some of a plurality of second image signals stored in an external memory.

As described above, the non-memory semiconductor implementing the graphic display function according to the present invention adds the time information and the graphic information to the digital video signal output from the video decoder, and then stores it in the selected storage means and then stores the digital or analog data if necessary. It does not require a separate chip or device to perform such a function by enabling the output as an image and the graphic display function within a single chip to perform an appropriate video signal conversion function according to the scanning method at the digital video signal input unit. In addition, by minimizing the resources of the CPU for transmitting the control signal, the manufacturing cost can be reduced and the efficiency of signal processing can be improved.

Hereinafter, a non-memory semiconductor implementing a graphic display function according to the present invention will be described with reference to the drawings.

1 is a block diagram illustrating a non-memory semiconductor implementing the graphic display function according to the present invention.

The non-memory semiconductor implementing the graphic display function according to the present invention basically receives a digital video signal input unit for receiving and outputting a digital video signal from the outside, and receives an output signal of the digital video signal input unit to remove high frequency components. A low pass filter, an image scaler for adjusting the resolution of the output signal passing through the low pass filter, a graphic display control unit for adding graphic information to the output signal passing through the image scaler, and adding time information to the output signal of the graphic display control unit A real time clock (RTC), a direct memory access controller (DMA) for controlling the movement of the output signal of the graphic display controller, and an output signal selected from the direct memory access controller as an analog signal. A synchronization signal generator for generating a reference signal for conversion, a digital video signal output unit for outputting the output signal of the synchronization signal generator as a digital signal, and a video encoder for converting and outputting the output signal of the digital video signal output unit to an analog signal Is made of.

The digital video signal input unit receives a digital video signal from an external device such as a video decoder and outputs a first video signal.

The low-pass filter blocks the high frequency components having a large color difference from the peripheral region among the image output signals of the digital image signal input unit, and passes only the low frequency components having a small color difference from the peripheral region to image blur the image output signal. This is for smoothly processing the texture of the image displayed on the LCD (Liquid Crystal Display) provided in the earphone.

The image scaler is for converting and outputting a first video signal passed through a low pass filter to have a suitable resolution on a screen such as an LCD of a video earphone.

The graphic display controller is configured to overwrite graphic data such as subtitles and images on a first image signal output through an image scaler in real time, thereby enabling a second image signal to be displayed on a screen such as a touch screen or an LCD. To output

The time information controller (RTC: Real Time Clock) informs the graphic display controller of time information, and adds time information to the second image output signal output therefrom, and maintains the time information continuously.

The direct memory access control unit (DMA) controls a large amount of data by controlling data movement between the memory and the memory, or moving data in and out of a method in which the microcontroller (MCU) directly accesses the external memory. It can be processed in real time, and because the microcontroller commands are executed independently, the microcontroller can direct the execution instructions to the memory access control section before proceeding with a separate task. The direct memory access control unit controls data storage and retrieval of a removable disk, that is, a removable disk control unit for controlling data storage and retrieval of a SD card, and nonvolatile memory such as a flash memory and a hard disk. And a volatile memory controller for controlling data storage and retrieval of volatile memory such as RAM, and the like, which includes graphic data and time information output through the graphic display controller. The two image signals may be selectively stored in a removable disk, nonvolatile memory or volatile memory, or may be mutually movable, or may be fetched to display the image signal externally.

The synchronization signal generator may convert the second video signal selectively output from the direct memory access control unit into a signal according to any one of an analog system standard such as National Television System Committee (NTSC) and Phase-Alternating Line (PAL). A third image signal is output by adding a reference signal to the second image signal.

The digital image signal output unit is configured to output the third image signal and the graphic data output from the synchronization signal generator as a digital image on a screen of an external device capable of processing digital image signals such as an LCD.

The video encoder converts a third video signal having a reference signal for analog conversion into an analog signal according to the output from the synchronization signal generator to output an analog image on a screen of an external device that cannot process digital video signals such as CRT. will be.

In addition, since the second image signal output from the graphic display control unit may be compressed through the image compression unit according to the still image data compression method (JPEG) and the moving image data compression method (Motion JPEG), and output directly to the memory access control unit. The stored data may be stored in at least one of a removable memory, a nonvolatile memory, and a volatile memory by the direct memory access controller, and the stored compressed data may be stored as raw data through the image restoring unit as selected by the direct memory access controller. The restored signal may be output to the synchronization signal generator through the graphic display controller. As such, by compressing and storing the second video signal and selectively outputting the second video signal, efficiency of data management can be increased.

Hereinafter, a description will be given of the representation method of the second video signal used in the present invention.

In general, the smallest unit constituting the screen is called a pixel, and the RGB coordinate system is a widely used method of representing a pixel. Since the RGB coordinate system is a combination of a total of 3 bytes of R (Red / 1 byte), G (Green / 1 byte), and B (Blue / 1 byte), the RGB coordinate system and the pixel representation have the same quality. Nevertheless, compared to the YCbCr coordinate system, which uses a total of 2 bytes of 1 byte of Y (Luminance / luminance) and 1 byte of CbCr (Chrominance / color difference), one byte is wasted according to the RGB coordinate system. In consideration of the above, the graphic display controller of the present invention stores the second image signal in one or more of an SD card, a nonvolatile memory, or a volatile memory in the YCbCr coordinate system format (the YCbCr coordinate system format before compression through the image compressor). When displaying saved data of YCbCr format selected by direct memory access controller on the screen of external device such as LCD and CRT, And a graphics converter for dynamic conversion (decompression through the image restorer and then conversion to RGB format).

Here, the graphic converter,

Y = 0.299R + 0.587G + 0.114B (Equation 1)

Cb = -0.172R-0.339G + 0.511B + 128 (Equation 2)

Cr = 0.511R-0.428G-0.083B + 128 (Equation 3)

Converting the second image signal output from the graphic display controller according to equations 1 to 3 into the YCbCr data format,

R = Y + 1.371 (Cr-128) (Equation 4)

G = Y-0.698 (Cr-128)-0.336 (Cb-128) (Equation 5)

B = Y + 1.732 (Cb-128) (Equation 6)

By converting to RGB data format according to equations 4 to 6 and outputting it, for example, an LCD having a resolution of 800x480 in a 7-inch size has 384,000 pixels. Although 1,152,000 bytes are required, the YCbCr method requires 768,000 bytes, resulting in a data capacity difference of 384,000 bytes, which can take advantage of 183M bytes if processing graphics of 500 frames.

FIG. 2 is a diagram illustrating a method of expressing a second image signal according to a conventional method, and FIG. 3 is a diagram illustrating a method of expressing a second image signal according to a non-memory semiconductor implementing the graphic display function of the present invention.

On the other hand, the direct memory access control unit controls the second image signal stored in the SD card, the nonvolatile memory or the volatile memory to the horizontal and vertical sizes (H, V) of the screen on which the second image signal is to be expressed, and the horizontal of the second image signal. And the vertical sizes h1 and v1, the start point coordinates START_X and START_Y, and the offsets (offset = H-h1-START_X). According to the conventional general method as shown in Figure 2, the microprocessor is responsible for moving the second image signal stored in the SD card, non-volatile memory or volatile memory to the LCD, the microprocessor is the data IMG ≠ 0 In case of LCD, the command must be repeated as much as V0 size. To express all data of IMG ≠ 0, IMG ≠ 1, and IMG ≠ 2, repeat the command as V0, V1, V2 size (resolution size in the vertical direction). While high performance microprocessors should be employed as the microprocessor may not be able to perform other operations while processing such repetitive tasks or it may take a long time to process large amounts of data, the high performance microprocessor The memory access control unit may process the microprocessor through the window coordinate conversion method as shown in FIG. 3. Correct the pressure and throughput degradation of the microprocessor resources may be performed by the on behalf of the functions as described above to be able to consequently improve the signal processing speed of the whole home network system.

The non-memory semiconductor which implements the graphic display function of the present invention receives an image of a home network and receives an SD card connected to a removable disk controller, a volatile memory connected to a volatile memory controller, and a nonvolatile memory controller through a process shown in FIG. While stored in a non-volatile memory connected to the, it is possible to selectively output digital and analog video through the process shown in FIG.

6 is a diagram illustrating a digital video signal input unit of a non-memory semiconductor implementing the graphic display function of the present invention, and FIG. 7 is a non-memory implementing the home security function and the graphic display function based on the intelligent home network system of the present invention. FIG. 10 is a diagram illustrating a register unit function of a direct memory access controller of a semiconductor. FIG.

On the other hand, a camera used in a home network system is mainly a CCD (charge coupled device) camera, which uses an existing CRT (Crown Tube) as a display device because it outputs an image signal based on interlaced scanning. Although there is no compatibility problem in this regard, it is necessary to convert the output signal of the CCD camera into a sequential scan type signal suitable for LCD in consideration of the sequential scanning method in recent years that the popular LCD input standard is used. Home automation system that controls peripheral devices based on serial (RS232 / 485) communication without network function is using CMOS sensor (solid-state imaging device) camera and CRT to reduce cost. In this case, CMOS sensor In order to express the progressive scan signal output from the camera to the CRT, Converting part that must be converted into a signal of a scanning type to be provided separately.

In order to solve the above-mentioned inconvenience, the digital image signal input unit of the present invention has a digital image signal output from the video decoder according to a signal transmitted from the outside according to the interlaced scanning method or the sequential scanning method and the third to be output. A scanning method determination unit that checks a scanning method of an image signal, and outputs a digital image signal of an interlaced scanning method or a sequential scanning method as it is or according to a scanning method of the third image signal confirmed by the scanning method determining unit Or a scanning conversion unit for converting and outputting the interlaced scanning method, wherein an externally transmitted signal is output from a microprocessor unit (CPU), which is essentially used for a home network system or a home automation system, Video signal is interlaced In addition to confirming whether the scanning method is in accordance with the second scanning method, the scanning method of the finally outputted third image signal is also matched with a device such as an LCD or a CRT to display the third image signal. According to the result, the scanning conversion unit outputs the interlaced or progressive scan signal as it is, or converts the interlaced signal into a progressive scan signal and converts the progressive scan signal into an interlaced signal. Through the above structure, the first video signal according to the scanning method set in the digital video signal input unit is output, and the first video signal is adjusted in size to match the resolution of the LCD or CRT in the image scaler.

The direct memory access control unit may further include a register unit for storing a part of the plurality of second image signals stored in the external memory described above, and the register unit includes a plurality of registers, for example, eight registers in the external memory. Image signal data (# 1 to #n) corresponding to one-to-one correspondence and the image scaler and the graphic display control unit refer to a pointer value of the register unit having the second image signal to be displayed and express the signal graphically. On the other hand, the second image signal stored in each register is stacked or randomly extracted in the most recently read order. By using such a register unit, it is possible to process a large amount of data stored in the external memory at high speed, reduce the resources of the home network system, and simplify the setting for controlling the external memory.

1 is a block diagram illustrating a non-memory semiconductor implementing the graphic display function according to the present invention.

2 is a diagram illustrating a method of representing a second video signal according to a conventional method.

3 is a view illustrating a second image signal representation method according to a non-memory semiconductor implementing the graphic display function of the present invention.

4 is a block diagram illustrating an image storing process according to a non-memory semiconductor implementing the graphic display function of the present invention.

5 is a block diagram illustrating an image reproducing process according to a non-memory semiconductor implementing the graphic display function of the present invention.

FIG. 6 is a diagram illustrating a digital image signal input unit of a non-memory semiconductor implementing the graphic display function of the present invention. FIG.

7 is a diagram illustrating a register unit function of a direct memory access control unit of a non-memory semiconductor implementing the graphic display function of the present invention.

Claims (7)

A digital video signal input unit for receiving and outputting a digital video signal output from the video decoder; A low pass filter for low-pass image blurring of the first image signal of the digital image signal input unit; An image scaler for adjusting a resolution of the first image signal passed through the low pass filter; A graphic display controller for overlaying graphic data on the first image signal that has passed through the image scaler; A time information controller (RTC: Real Time Clock) for informing and maintaining time information to the graphic display controller; A direct memory access control unit (DMA) for directly controlling the storage or retrieval of the second image signal passed through the graphic display control unit in an external memory; The second video signal selectively output from the direct memory access controller may be converted into a signal according to any one of an analog system standard such as a National Television System Committee (NTSC) and a phase-alternating line (PAL). A synchronization signal generator for adding a reference signal; A digital video signal output unit for outputting a third video signal through the synchronous signal generator to the outside; And a video encoder for converting and outputting a third image signal output from the synchronization signal generator to an analog signal. The method according to claim 1, The direct memory access controller may include a removable disk controller for controlling a secure digital card, a nonvolatile memory controller for controlling a nonvolatile memory, and a volatile memory controller for controlling a volatile memory. A non-memory semiconductor that implements a graphic display function. The method according to claim 2, The second image signal output from the graphic display control unit is compressed through the image compression unit according to the still image data compression method (JPEG) and the moving image data compression method (Motion JPEG), and then is directly output to the direct memory access control unit. It is stored as compressed data in one or more of nonvolatile memory and volatile memory. The non-memory semiconductor implementing the graphic display function of the compressed data selected by the direct memory access control unit is restored to raw data through the image restoring unit and then output to the synchronization signal generator via the graphic display control unit. . The method according to claim 3, The graphic display controller supplies a second video output signal, Y = 0.299R + 0.587G + 0.114B (Equation 1) Cb = -0.172R-0.339G + 0.511B + 128 (Equation 2) Cr = 0.511R-0.428G-0.083B + 128 (Equation 3) In the YCbCr data format according to equations 1 to 3, stored in at least one of an SD card, a nonvolatile memory, and a volatile memory selected by the direct memory access control unit. R = Y + 1.371 (Cr-128) (Equation 4) G = Y-0.698 (Cr-128)-0.336 (Cb-128) (Equation 5) B = Y + 1.732 (Cb-128) (Equation 6) The non-memory semiconductor implementing the graphic display function, characterized in that it further comprises a graphic converter for converting the output to the RGB data format according to the equations 4 to 6. The method according to claim 4, The direct memory access controller may be configured to convert a second image signal stored in an SD card, a nonvolatile memory, or a volatile memory into a horizontal and vertical size (H, V) of a screen on which the second image signal is to be represented, and a horizontal and vertical size of the graphic data. and (h1, v1), a start point coordinate (START_X, START_Y), and an offset (offset = H-h1-START_X) to display the non-memory semiconductor having a graphic display function. The method according to claim 1, The digital image signal input unit includes a scanning method determination unit for confirming whether the digital image signal output from the video decoder is based on an interlaced scanning method or a sequential scanning method and a scanning method of the third image signal to be output according to a signal transmitted from the outside. And a scanning method converting unit outputting the interlaced scanning method or the progressive scanning method according to the scanning method of the third image signal confirmed by the scanning method determining unit as it is, or converting and outputting the sequential scanning method or the interlaced scanning method. Non-memory semiconductor that implements a graphic display function, characterized in that it further comprises. The method according to claim 1, The non-memory semiconductor of claim 1, wherein the direct memory access controller further includes a register unit configured to store some of the plurality of second image signals stored in an external memory.

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