JPH02126780A - Picture signal encoder - Google Patents

Abstract

PURPOSE:To suppress the encoding deterioration of a picture signal expressing an area designated with the intention of a transmitting side by coding the picture signal expressing the designated area by means of a coding parameter at small deterioration different from the picture signal expressing the area which is out of the designation. CONSTITUTION:When an upper left angle (X1, Y1) and a lower right angle (X2, Y2) are designed by an area designating signal 7, a picture monitoring signal 12 added with a pointer is outputted from an output terminal (d). Simultaneously, the picture signal to express an oblique line part area A surrounded by a rectangle using the positions designated by the (X1, Y1) and (X2, Y2) as a diagonal is coded by a first coding parameter which restricts the deterioration of resolution due to encoding. The picture signal to express an area B is coded by a second coding parameter which permits the deterioration of the resolution due to encoding, block addresses (X1, Y1) and (X2, Y2) are multiplexed, and outputted from an output terminal (c) as a multiplexing signal 11.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a device for encoding nine image signals.

[Conventional technology]

Conventionally, when encoding one image signal, the image signal representing the entire nine screens is encoded using one encoding parameter, or each screen is divided into several regions and each divided region is Either encodes the represented image signal using encoding parameters that are automatically determined according to the amount of information.

For each region, the motion and static of the image signal representing the region is determined, and the image signal representing each region is encoded using encoding parameters according to the determination result.

[Problem to be solved by the invention]

In the conventional image signal encoding device described above.

When sending screens during video conferences, video calls, etc.

Even if there is something you want the other side to pay attention to.

Encoding is performed in the same way as other unnecessary parts, and in particular, control to encode moving parts using encoding parameters that generate less information in order to determine the motion and static of the screen and reduce the amount of information in moving parts. At times, the part of the body that you want to draw attention to moves.

The disadvantage is that bad encoding parameters are selected. In addition, when encoding an image signal representing the entire 9 screens with one encoding parameter, even if movement occurs in unnecessary parts and information is generated, the characteristics of the entire screen received by the other party will be affected. This has the disadvantage that the parts that you want to draw attention to will naturally be encoded with bad encoding parameters.

[Means to solve the problem]

An image signal encoding apparatus according to the present invention is an apparatus for encoding an image signal representing each screen.

Image signal distinguishing means for distinguishing the image signal into a plurality of partial image signals for each region.

and encoding means for encoding each partial image signal distinguished by the image signal distinguishing means using predetermined mutually different encoding parameters.

Below is a margin [Example] Next, one embodiment of the present invention will be described with reference to the drawings. In this embodiment, this is for the purpose of simplifying the explanation.

In the following explanation, only one region of the screen is specified, and there are only two types of encoding parameters: inside the designated region and outside the designated region, and the shape of the designated region is limited to a rectangle.

FIG. 1 is a block diagram showing the configuration of an image signal encoding device according to an embodiment of the present invention. input. From the analog/digital conversion=101, the digitally converted image signal 2 is output to the blocking circuit 102. The blocked image signal 3 is sent from the blocking circuit 102 to the first encoding circuit 103 and the second encoding circuit 1.
04. The first encoded image signal 4 is output from the first encoding circuit 103 to the first input terminal of the selection circuit 105 . The second encoded image signal 5 is output from the second encoding circuit 104 to the second input terminal of the selection circuit 105 . The selection circuit 105 outputs the 9-selection encoded image signal 6 to the first input terminal of the multiplexing circuit 106 . The multiplexing circuit 106 outputs the multiplexed signal 11 to the output terminal C.

Further, the area designation signal 7 inputted from the input terminal is inputted to the block address generation circuit 107. From block address generation circuit 107.

The block address signal 8 is output to the selection signal generation circuit 108, the second input terminal of the multiplexing circuit 106, and the pointer generation circuit 109. 2 from the selection signal generation circuit 108
The selection signal 9 is output to the control terminal of the selection circuit 105.

From the pointer generation circuit 109, the pointer signal 10
is output to the mixing circuit 110. A nine-image monitor signal output 12 is outputted from the mixing circuit 110 to an output terminal d.

Next, the operation of the apparatus shown in FIG. 1 will be explained.

An analog image signal 1 inputted from an input terminal a is PCM-converted by an analog/digital converter 101 and output as an image signal 2 of a digital signal. Image signal 2 is input to blocking circuit 102, and blocking circuit 1
02, each screen represented by one image signal 2 is divided into m equal parts in the horizontal direction and n equal parts in the vertical direction, as shown in FIG.

Blocking is performed by dividing into mXn small areas (blocks). Each block has an address set.

The address of the horizontally th block and the vertically th block is expressed as (K, L). In the second encoding circuit 104, the blocked image signal 3 is encoded using a second encoding parameter (B) that allows deterioration of resolution in order to reduce the amount of information generated. A coded image signal 5 is output. On the other hand, the first encoding circuit 103 encodes the first encoded image signal 4 using the first encoding parameter (A) that has a limit on resolution deterioration.
Output. In the selection circuit 105, the 1 selection signal 9 is rAsE.
When the selection signal 9 is I-BSELJ, the first encoded image signal 4 is selected, and when the selection signal 9 is I-BSELJ, the second encoded image signal 5 is selected.
is selected and output as a 9 selection encoded signal 6. The multiplexing circuit 106 is.

Multiplexing the selection encoded signal 6 and the block address 8,
A multiplexed signal 11 is output.

On the other hand, the area designation signal 7 input from the input terminal is a signal that designates a partial area of the screen represented by the input image signal. , as shown in Figure 3, the position of the upper left corner (xl, yl
) and the position of the lower right corner (x2.y2). The block address generation circuit 107 receives the area designation signal 7 (xi,
yl) and (x2.y2) into block address signals 8, respectively. The selection signal generation circuit lO8 is.

Upon receiving the block address signal 8, the block address (XI, Yl) and the block address (
X2. In the shaded area A, which is inside the rectangle whose diagonal is the line connecting Y2), the rAsELJ signal is applied to the selection signal 9, and in the white area B other than the shaded area A, the selection signal 9 is
Each outputs a BSELJ signal. Pointer generation circuit 109 receives block address signal 8 and outputs pointer signal 10 to the positions (X1, Y1) and (X2. Y2) shown in FIG. The mixing circuit 110 mixes the input image signal l and the pointer signal 10.

An image monitor signal 12 with a pointer added on the input image screen is output. The multiplexing circuit 106 is.

The selection encoded signal 6 and the block address signal 8 are multiplexed and a multiplexed signal 11 is output.

Area designation signal 7 input from outside according to the above operation
The upper left corner (XI, Yl) and lower right corner (X2.
Y2), the 9-image monitor signal 12B, (
xl, yl) and (X2.Y2) are output from output terminal d, and at the same time (Xl, Y
The image signal representing the shaded partial area A surrounded by a rectangle whose diagonal lines are the positions indicated by On the other hand, the image signal representing area B other than the shaded partial area A is encoded using the second encoding parameter (B) that allows deterioration of resolution due to encoding, and is encoded using the block address (XI, Yl). and the block address (X2.Y2).

The multiplexed signal 11 is output from the output terminal C.

In this embodiment, the area is specified only in one place, the encoding parameters are limited to two types: inside the specified area and outside the specified area, and the shape of the area specified is also limited to a rectangle. It is clear that the same configuration as in this embodiment can be made even if there are m types of encoding parameters at n locations, and it is clear that the shape of the designated area is not limited to a rectangle.

〔Effect of the invention〕

As explained above, the present invention has a plurality of types of encoding parameters, specifies a screen area from the outside, and allows image signals representing the specified area to be degraded differently from image signals representing unspecified areas. By encoding with fewer encoding parameters, it is possible to minimize the encoding deterioration of the image signal representing the area specified by the transmitter's will.

Margin below

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an image signal encoding device according to an embodiment of the present invention, FIG. 2 is a diagram showing block addresses, FIG. 3 is a diagram showing area designation, and FIG. 4 is a diagram showing designated areas. FIG. a...input terminal, b...input terminal, C...output terminal. d... Output terminal, 1... Image signal, 2... Image signal. 3... Blocked image signal, 4... First coded image signal, 5... Second coded image signal, 6... Selective coded signal, 7... Area designation signal, 8... Block address signal, 9... Selection signal, 10... Pointer signal, 11... Multiplexed signal, 12... Image monitor signal. 101...Analog/digital converter, 102...
- Blocking circuit, 103...first encoding circuit, 1
04 Second encoding circuit, 105... selection circuit, 106
. . . multiplexing circuit, 107 . . . block address generation circuit. 108... Selection signal generation circuit, 109... Pointer generation circuit, 110... Mixing circuit. /1-1, 2nd figure, 3rd concave, 4th figure

Claims (1)

[Scope of Claims] 1. In an apparatus for encoding an image signal representing each screen, each divided partial area is encoded so that each screen is divided into a plurality of partial areas according to an area designation signal. an image signal discriminating means for discriminating the image signal into a plurality of partial image signals; and encoding for encoding each partial image signal distinguished by the image signal discriminating means using predetermined mutually different encoding parameters. An image signal encoding device comprising means.