JPH05199506A - Transmitting image processing method - Google Patents

Abstract

PURPOSE:To easily process a transmitting image by using an input frame memory and to apply this method as the transmitting image processing circuit of a video communication terminal by reducing the degradation of images. CONSTITUTION:Concerning the transmitting image processing method for highly compressed video coded transmission, a processing method is provided to select any desired video signal out of video signals read from an input frame memory 22 or video signals read from a pattern generating memory 23, to process the selected video signal and to input the processed video signal to the input frame memory 22 and for these processings, operational conditions are designated with a block constituting the image as a unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high compression video coding transmission technique, and more particularly to a technique for easily realizing a method of creating a video signal for high compression video coding transmission.

[0002]

2. Description of the Related Art FIG. 4 shows an embodiment of a transmission image processing method in conventional high compression video coding transmission. In the figure, 1
Is a video signal input terminal, 10 is a transmission image processing circuit, 15 is an encoding device, and 5 is an encoded data output terminal. The transmission image processing circuit 10 includes an input conversion circuit 11 and a video conversion circuit 1.
2, output conversion circuit 13, video conversion frame memory 14
Consists of. The encoding device 15 includes an input conversion circuit 2, an input frame memory 3, and an encoding processing unit 4.

A video signal input from the video signal input terminal 1 is converted by an input conversion circuit 11 into a type suitable for the video conversion circuit 12. For example, the input conversion circuit 11 is configured by luminance signal / color difference signal separation, analog / digital conversion, real-time input / sequential output conversion, and the like. The resulting video signal is processed by the video conversion circuit 12. Here, image coordinate conversion, size conversion, gradation conversion, composition with the image stored in the video conversion frame memory 14, and the like are performed. The output of the video conversion circuit 12 is returned to the original signal type by the output conversion circuit 13. The output of the output conversion circuit 13 is input to the input conversion circuit 2 for input conversion to the encoding processing unit 4, and the input frame memory 3
Is converted again into a signal type suitable for the encoding processing unit 4. The output of the input conversion circuit 2 is encoded by the encoding processing unit 4, and the encoded data is the encoded data output terminal 5
Will be output.

[0004]

The above-described configuration is conditioned on the fact that the transmission image processing circuit 10 is configured independently of the encoding device 15, and the transmission image processing circuit 10 is inserted in the preceding stage of the encoding device 15. It works. Therefore, if the transmission image processing circuit 10 is removed, the encoding device 15 alone operates. However, with such a configuration, there are drawbacks that the functions of the transmission image processing circuit and the encoding device overlap, the overall circuit scale increases, and unnecessary conversion is inserted to deteriorate the image.

An object of the present invention is to realize a transmission image processing method which is simple and has little image deterioration.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

[0007]

In order to achieve the above object, the present invention comprises an input conversion circuit 2 of a coding device 15 and a transmission image processing circuit 10 collectively. That is, in a method of creating a video signal for high-compression video coding transmission, a desired video signal is selected from an input video, an input frame memory, or a pattern memory, the selected video signal is processed, and the processed video signal is processed. Is input to the input frame memory, and these processing are characterized by designating an operation condition in units of blocks forming an image.

[0008]

According to the above-mentioned means, it is possible to easily process the transmitted video while avoiding the duplication of the functions of the transmission image processing circuit and the encoding device.

[0009]

EXAMPLE 1 Example 1 of the present invention is shown in FIG. 1 is a video signal input terminal, 2 is an input conversion circuit, 20 is an input selection circuit, 21 is a video conversion circuit, 22 is an input frame memory, 23 is a pattern generation memory, 24 is a control circuit, 25 is a control signal input terminal, 4 Is an encoding processing unit, and 5 is an encoded data output terminal.

The TV signal input from the video signal input terminal 1 is converted by the input conversion circuit 2 into a type suitable for the video conversion circuit 21. For example, the input conversion circuit 2 is configured by luminance signal / color difference signal separation, analog / digital conversion, real-time input / sequential conversion, etc., and converts the video signal under the condition designated by the control circuit 24 in units of blocks. Here, the block refers to one unit when the screen is divided into vertical 16 and horizontal 16, for example.

The video signal converted by the input conversion circuit 2 is input to the input selection circuit 20. Input selection circuit 20
In addition, the video signal read from the input frame memory 22 and the video signal read from the pattern generation memory 23 are also input to.

The input selection circuit 20 selects a desired video signal from these video signals under the condition designated by the control circuit 24 in block units, and outputs it to the video conversion circuit 21. In the block in which the video signal input from the input conversion circuit 2 is selected, the input video becomes the transmission video. When the signal read from the input frame memory 22 is selected, the once transmitted image is input again. By selecting the signal read from the pattern generation memory 23, characters or prepared figures can be used as a transmission image.

The video conversion circuit 21 converts the input signal into
The data is converted by the processing designated by the control circuit 24 and written in the input frame memory 22. Here, coordinate conversion, size conversion, gradation conversion, etc. can be performed. When two or more inputs are required, the input selection circuit 20 outputs the required number of video signals. Examples of this include weighted addition of images, superimposing, and chroma keying.
As a special example, if you want to freeze the input video,
Prohibit data writing to the corresponding block.

The input frame memory 22 inputs and outputs the data of the input selection circuit 20 and the video conversion circuit 21, and outputs the memory contents to the encoding processing unit 4 in response to a request from the encoding processing unit 4. The encoding processing unit 4 encodes the memory contents and outputs the encoded data from the encoded data output terminal 5.

The control circuit 24 generates necessary processing conditions in the input selection circuit 20, the image conversion circuit 21, and the input frame memory 22 in units of blocks forming an image. A control signal input terminal 25 inputs an instruction signal indicating processing content to the control circuit 24.

Creation of a control signal in units of blocks is as follows.
Do the following: The signal input from the control signal input terminal 25 is composed of a window command including a window number, an input source type, a conversion type, an input address, an output address, and a pattern instruction parameter. A plurality of window commands are sequentially analyzed to determine the window to be displayed by each block. This window parameter is used for each block to generate a control signal.

FIG. 3 shows an example of an image realized as the result transmission image. The screen is divided into an area A and an area B as shown in FIG. 3 (a), and in each area, as shown in FIG. 3 (b),
The input image, the input frame memory reduced image, and the pattern memory image can be appropriately combined and displayed.

(Embodiment 2) FIG. 2 shows a circuit of Embodiment 2 which is a modification of Embodiment 1. 2 that are the same as those of the first embodiment shown in FIG.

Differences between the circuit of this example and the first embodiment will be described. The video signal converted by the input conversion circuit 2 is input to the input frame memory 22. The signal read from the input frame memory 22 and the pattern generation memory 2
The signal read from 3 is input to the input selection circuit 20. The signal converted by the video conversion circuit 21 is input to the input frame memory 22 and the encoding processing unit 4.

The present embodiment is functionally different from the first embodiment in the processing synchronization condition of the video conversion circuit 21 and the encoding processing unit 4. In the first embodiment, the video conversion circuit 21 and the encoding processing unit 4 can be made independent in processing order by interposing the input frame memory 22, whereas in FIG. 2, it is necessary to synchronize the processing order. The relationship between the input video and the video conversion circuit 21 is opposite, and in this example, the input frame memory 2 is provided between the input video and the video conversion circuit 21.
Through 2, the processing order can be made independent. Further, in order to make the processing sequence of the input image, the image conversion circuit, and the encoding processing section independent, it is possible to add another frame memory to each of the circuits of FIGS. 1 and 2.

Although the invention made by the present inventor has been specifically described based on the embodiments, the invention is not limited to the above-mentioned embodiments and various modifications can be made without departing from the scope of the invention. Needless to say.

For example, the contents of the processing can be variously modified depending on the function prepared in the video conversion circuit and the control pattern output from the control circuit. The gist of the present invention is to realize these functions by using the input frame memory of the encoding device. Therefore, using the present invention, it is possible to easily add another conversion to the coordinate conversion, size conversion, gradation conversion as a conversion function, or change the control signal sequence output from the control circuit for each input frame. Is. Further, although the functional blocks are described as circuits in the embodiments,
These may be implemented programmatically.

[0023]

As described above, according to the present invention,
By using the input frame memory, it is possible to easily process the transmitted video and the deterioration of the video is small, so that it can be applied as the transmitted video processing circuit of the video communication terminal.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of an example of a transmission image according to the present invention.

FIG. 4 is a circuit diagram of a conventional transmission image processing method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Video signal input terminal, 2 ... Input conversion circuit, 4 ... Encoding processing part, 5 ... Encoded data output terminal, 20 ... Input selection circuit, 21 ... Video conversion circuit, 22 ... Input frame memory,
23 ... Pattern generation memory, 24 ... Control circuit, 25 ... Control signal input terminal.

Claims (1)

[Claims] 1. A transmission image processing method for high compression video coding transmission, wherein a desired video signal is selected from an input video signal, a video signal read from an input frame memory, or a video signal read from a pattern memory. Select
A processing method of processing the selected video signal and inputting the processed video signal to the input frame memory is provided, and in these processings, an operation condition is designated in units of blocks forming a video. Transmission image processing method.