KR100444946B1 - Frame grabber device for interfacing image data - Google Patents

Abstract

Disclosed is a color / black and white selective 32-bit frame grabber capable of selectively transmitting a color video output signal of a video decoder in color or black and white according to a selection switch.

The present invention provides a frame grabber device for interfacing image data, comprising: an input unit for receiving analog image data; A video decoder for converting analog image data input by the input unit into digital image data; A selection switch for adjusting a color / monochrome image; Four 8-bit field memories for storing 16-bit digital image data output from the video decoder; A color multiplexer for selectively transmitting digital image data to the field memory according to the selection switch and a PLD controller for controlling storage of video data according to the selection switch. Or it provides a device that can selectively transmit in black and white.

Description

Frame grabber device to interface image data {FRAME GRABBER DEVICE FOR INTERFACING IMAGE DATA}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame grabber device for interfacing image data, and in particular, when storing a color image digital signal of a video decoder in a field memory by manipulation of a selection switch, the data can be selectively transmitted in color or black and white by changing the stored data and order. An optional 32-bit frame grabber device in color / monochrome.

In general, a frame grabber device that has been used in the prior art, as shown in FIG. 1, receives an input unit 11 for receiving analog image data, a video decoder 12 for decoding the analog data, and an output from the video decoder 12. Four 8-bit field memories 13 for storing digital video signals. In the conventional frame grabber device having such a configuration, in order to transmit a monochrome image, a method of storing only the Y signal of the video decoder 12 in the field memory 13 is used. However, this method has a problem in that the black and white image cannot be transmitted because the storage data line stored in the field memory 13 is already fixed.

In order to solve the above problems, a frame grabber device is typically used as a black and white video signal using only the Y signal among color image signals transmitted from an application after receiving a color image signal. In most cases, it is impossible to select color / monochrome, and even if it is selectable, there is no gain in data transmission even though the amount of transmitted data is reduced to 1/2 when the monochrome video signal is selected.

Accordingly, the present invention has been made to solve the above problems, and when the color image digital signal of the video decoder is stored in the field memory by the selection switch operation, it can be selectively transmitted in color or black and white by changing the stored data and the order. An object is to provide a color / monochrome optional 32-bit frame grabber device.

Frame grabber device for interfacing the image data of the present invention for achieving the above object comprises an input unit for receiving analog image data; A video decoder for converting analog image data input by the input unit into digital image data; A selection switch for selecting a color or black and white image; Four 8-bit field memories for storing 16-bit digital image data output from the video decoder; And a multiplexer for selectively sending digital image data to a field memory according to the selection switch, and a PLD controller for controlling storage of video data according to the selection switch.

In the above, the write enable signal is converted into 32 bits so that the digital color video signal of the video decoder is written in the field memory according to the color / monochrome selection switch.

1 is a block diagram of a conventional frame grabber device.

2 is a block diagram of a color / monochrome optional 32 bit frame grabber device of the present invention;

3 is a digital video output timing diagram of a video decoder.

4 is a timing diagram of a field memory write enable signal for color image transmission in a frame grabber device according to the present invention;

5 is a timing diagram of a field memory write enable signal for monochrome image transmission in a frame grabber device according to the present invention;

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

21 --- Input 22 --- Video Decoder

23 --- selection switch 24 --- field memory

25 --- Multiplexer 26 --- PLD Controller

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

2 is a block diagram of a color / monochrome selective 32-bit frame grabber device according to the present invention, and includes an input unit 21, a video decoder 22, a selector switch 23, a field memory 24, a multiplexer 25, and a PLD. It consists of a controller 26.

The input unit 21 receives analog image data.

The video decoder 22 converts analog image data input from the input unit 21 into 16-bit digital image data, and at this time, the 16-bit digital image data is output as a YUV signal in a 4: 2: 2 format. .

The selector switch 23 adjusts the color / monochrome image.

The field memory 24 is four memory devices composed of 8 bits and stores 16 bits of digital image data output from the video decoder 22.

The multiplexer 25 selectively transmits digital image data by the adjustment of the selection switch 23 to the field memory 24.

The PLD controller 26 controls video data storage in accordance with the selection switch 23.

3 is a timing diagram of digital video output of a video decoder. In the case of a color video decoder, video data is output in a Y: U: V = 4: 2: 2 format in an 8-bit or 16-bit mode. In this case, the Y signal corresponds to a contrast signal (brightness signal), and only the Y signal needs to be transmitted when transmitting a black and white video digital signal.

4 is a timing diagram of a field memory write enable signal for transmitting a color image digital signal in a frame grabber device according to the present invention, and FIG. 5 is a field for transmitting a monochrome image digital signal in a frame grabber device according to the present invention. A timing diagram of a memory write enable signal.

FIG. 4 is a timing diagram of a field memory write enable signal when 32-bit color image data is to be transmitted. In FIG. 4, a 16-bit color digital image signal is stored in the field memories 24 and 2, and then the field is stored. Stored sequentially in memories 24 and 2. At this time, the multiplexer 25 selects VD [7: 0] (UV [7: 0]) to store the Y [15: 8] video signal in the field memories 24 and 3, and the field memory 24 2. And 4 store Y [7: 0] (VD [7: 0]) video signals. For the above operation, the PLD controller 26 outputs the write enable signal / WE of the field memory 24.

FIG. 5 is a timing diagram of a field memory write enable signal when black and white image data is to be transmitted in 32 bits. FIG. 5 sequentially shows a 16 bit black and white digital image signal in field memories 24, 1, 2, 3, and 4; Save as. At this time, the multiplexer 25 selects VD [15: 8] (Y [7: 0]) and stores only the Y [15: 8] image signal in the field memories 1, 2, 3, and 4. For the above operation, the PLD controller 26 outputs a write enable signal / WE of the field memory.

In the apparatus for reading the enable signal stored in the field memory, a 32-bit signal can always be read as it is and used as image data. Therefore, when the transmission signal is transmitted as black and white image data, the transmission speed can be doubled.

Next, the operation of the present invention having the above configuration will be described.

The frame grabber device for interfacing the image data of the present invention converts the analog image data signal input from the input unit 21 into a YUV signal of 4: 4: 2 format, which is a digital signal, by the video decoder 22 and outputs it. The multiplexer 25 selectively transmits and stores the digital image data to the field memory 24 so that the digital signal outputted as described above can be selectively transmitted by the operation of the selection switch 32. . In this case, when the color image data is to be transmitted, the 16-bit color digital image signal is stored in the field memories 24 and 2 and sequentially stored in the field memories 24 and 2. At this time, the multiplexer 25 selects VD [7: 0] (UV [7: 0]) to store the Y [15: 8] video signal in the field memories 24 and 3, and the field memory 24 2. And 4 store Y [7: 0] (VD [7: 0]) video signals. For the above operation, the PLD controller 26 outputs the write enable signal / WE of the field memory 24.

In addition, when transmitting black and white video data, 16-bit black and white digital video signals are sequentially stored in the field memories 24, 1, 2, 3, and 4. FIG. At this time, the multiplexer 25 selects VD [15: 8] (Y [7: 0]) and stores only the Y [15: 8] image signal in the field memories 1, 2, 3, and 4. For the above operation, the PLD controller 26 outputs a write enable signal / WE of the field memory.

The present invention is not limited to the above embodiments, and it is apparent that many modifications are possible by those skilled in the art within the technical spirit of the present invention.

As described above, according to the present invention, in a frame grabber apparatus for interfacing image data, the color video output signal of the video decoder is selectively stored in color or black and white by changing the stored data and the order when the color video output signal of the video decoder is stored in the field memory according to a selection switch. It is possible to provide optional color / monochrome 32-bit frame grabber that can be transmitted.In addition, the device that reads the enable signal stored in the field memory can always read the 32-bit signal and use it as the image data. If received, there is an advantage that a double transmission speed can be obtained.

Claims (3)

An input unit 11 for inputting analog image data; A video decoder 12 for converting analog image data input by the input unit into digital image data; A selection switch 23 for selecting a color or black and white image; Four 8-bit field memories (13) for storing 16-bit digital image data output from the video decoder; A multiplexer 25 for selectively sending digital image data to a field memory according to the selection switch; And And a PLD controller (26) for controlling the storage of video data according to the selection switch. delete The frame grabber device according to claim 1, wherein the write enable signal is converted into 32 bits by writing the digital color video signal of the video decoder into the field memory according to the color / monochrome selection switch.