JPH0318190A - Picture cording transmitter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an image encoding and transmitting device that compresses the bandwidth of a human-generated video signal and transmits the video signal.

[Conventional technology]

FIG. 2 is, for example, published in rNEC Technical Journal J rVol. 41,
N (L9; pp. 39-40, 1988) is a block connection diagram showing the conventional image encoding and transmitting device. An image signal preprocessing unit that performs preprocessing such as conversion (hereinafter referred to as A/D conversion), and 2 an image code that encodes the image data preprocessed by the image signal preprocessing unit l according to a predetermined algorithm. Kabe,
3 is a line interface unit that sends the encoded data encoded by the image encoding unit 2 to the transmission line and receives the encoded data from the transmission line; 4 is a line interface unit that transmits the encoded data encoded by the line interface unit 3; , decoded according to a decoding algorithm that performs inverse processing of the above encoding algorithm,
An image decoding section 5 converts the image data into image data, and 5 is an image signal post-processing section that performs post-processing such as digital/analog conversion (hereinafter referred to as D/A conversion) on the decoded image data and outputs it as a video signal. Next, we will explain the operation. First, a video signal output from a video camera is A/D converted in an image signal preprocessing section 1, and becomes image data of a digital signal. This image data is then encoded by the image encoding unit 2 according to a predetermined encoding algorithm. The coded data encoded in this manner is converted into a signal that can be sent to the transmission line at the line interface unit 3, and then output to the transmission line as line data. On the other hand, line data from the transmission path is received by the line interface section 3 and converted into encoded data. Then, this encoded data is further decoded by the image decoding unit 4 according to a decoding algorithm that performs inverse processing of the above-mentioned encoding algorithm, and becomes image data. Then, this image copying data is D/A converted by the image signal post-processing section 5 and outputted as a video signal.

[Problem to be solved by the invention]

Conventional image encoding and transmission devices are designed as described above, so that all input video signals of the entire screen are encoded and decoded in the same way, so the decoded video signal There were problems such as not being able to see only the desired part of the reproduced image in detail. This invention was made to solve the above-mentioned problems, and without increasing the amount of encoded data for one screen,
The target part of the entire screen. It is an object of the present invention to provide an image encoding and transmitting device capable of extracting image data for only a portion of the image and decoding the image data of the extracted portion more faithfully than the image data of other portions.

[Means to solve the problem]

In the image encoding and transmitting device according to the present invention, an image extraction section extracts image data of a target portion from input image data, and a first encoding section converts the extracted image data into encoded data. The image data other than the above-extracted image data is encoded by a second encoding unit so that the amount of encoded data is reduced,
Further, each encoded image data is multiplexed by a multiplexer and output.

[Effect]

The image extraction unit in this invention cuts out a desired part of the input image data, and compares the cut out image data with other image data to convert it into a natural image in the first encoding unit. In order to obtain a similar image, a sufficiently large amount of data is encoded, and some of the images are converted into C
To enable faithful and highly accurate expression on an RT display, etc.

[Embodiments of the invention]

An embodiment of this invention will be explained below with reference to the drawings. 1st
In the figure, 1 is an image signal preprocessing unit that inputs a video signal captured by a video camera and performs preprocessing such as A/D conversion, and 6 is an image signal preprocessing unit that receives image data that has been preprocessed by the image signal preprocessing unit 1. , an image extraction unit that extracts the image data of the target part; 2a is a first encoding unit that encodes the image data extracted by the image extraction unit 6; and 2b is a first encoding unit that encodes the image data extracted by the image extraction unit 6; a second encoding unit that encodes image data, 7
is a multiplexing unit that multiplexes encoded data encoded by each of the first encoding unit 2a and the second encoding unit 2b,
3 is a line interface unit that sends the encoded data multiplexed by the multiplexer 7 to the transmission line and receives the encoded data from the transmission line; 8 is the encoded data received by the line interface unit 3; A decoding unit 4a performs inverse processing of the multiplexing in the multiplexing unit 7, and a decoding unit 4a performs inverse processing of the encoding algorithm encoded in the first encoding unit 2a on the encoded data separated in the demultiplexing unit 8. a first decoding unit that decodes image data according to an algorithm;
4b is a second decoding unit that decodes the encoded data separated by the separation unit 8 according to a decoding algorithm that performs inverse processing of the encoding algorithm encoded by the second encoding unit 2b, and converts it into image data. , 9 is the l-th decoding unit 4a
and a second decoding unit 4b, and a synthesis unit 5 performs post-processing such as D/A conversion on the image data combined in the synthesis unit 9, and converts the image data into a video signal. This is a post-processing unit for image signals. Next, the operation will be explained. First, a video signal output from a video camera is processed by an A/D converter in an image signal preprocessing section 1.
It is converted and becomes image data. Then, from this image data, only the image data of the target portion is extracted by the image extraction unit 6, and the image data is divided into the extracted image data and the image data of the other portions. Among the divided image data, the image data other than the extracted image data is encoded by a predetermined algorithm in the second encoding section 2b. On the other hand, the extracted image data is also transmitted to the first encoding unit 2.
A is encoded using a predetermined algorithm. At this time, the encoding algorithm in the first encoding unit 2a is
The encoding algorithm of the second encoding unit 2b is an algorithm that allows more faithful decoding than the encoding algorithm of the first encoding unit 2b. The encoding algorithm is such that the amount of encoded data is smaller than the amount of encoded data. Next, this first
The encoded data output from the encoder 2a and the second encoder 2b is multiplexed by the multiplexer 7, converted into a signal that can be output to the transmission path by the line interface 3, and then transmitted. output to the road. On the other hand, when the line interface section 3 receives line data from the transmission path, this line data is converted into encoded data, and the demultiplexing section 8 performs the reverse process of the multiplexing process performed by the multiplexing section 7, and converts the line data into two encoded data. data. One of the encoded data corresponds to the encoded data encoded by the first encoding section 2a, and this is transmitted to the first decoding section 4a.
, decoding is performed according to a decoding algorithm that is the inverse processing of the encoding algorithm in the l-th encoding unit 2a,
Image data. In addition, the other encoded data corresponds to the encoded data encoded by the second encoding section 2b, and is sent to the second decoding section 4b and then to the encoded data encoded by the second encoding section 2b. The image data is decoded according to a decoding algorithm that is the inverse processing of the encoding algorithm. Next, the first decoding section 4a and the second decoding section 4
The two image data decoded in step b are combined in a combining section 9 and subjected to D/A conversion in an image signal post-processing section 5 to be output as a video signal. By doing so, only the necessary portion of the image can be faithfully reproduced without increasing the amount of encoded data for one screen.

【Effect of the invention】

As described above, according to the present invention, the image extracting section extracts the image data of the target part from the manually generated image data, and the extracted image data is encoded by the first encoding section. The image data other than the above-extracted image data is encoded by a second encoding unit so that the amount of encoded data is reduced, and each of these encoded image data is then encoded by a multiplexing unit. Since the structure is configured to multiplex the image and output it, it is possible to reproduce some images faithfully and with high precision, and to obtain an image close to a natural image. The effect is that what can be obtained without a significant increase in the amount of data is obtained.

[Brief explanation of drawings]

FIG. 1 is a block connection diagram showing an image coding and transmitting apparatus according to an embodiment of the present invention, and FIG. 2 is a block connection diagram showing a conventional image coding and transmitting apparatus. 2a is a first encoding section, 2b is a second encoding section, 6 is an image extraction section, and 7 is a multiplexing section. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] an image extraction unit that extracts image data of a target portion from image data obtained from a video camera; and a first unit that encodes the image data extracted by the image extraction unit so that the amount of encoded data increases. an encoding unit; and a second encoding unit that encodes image data other than the extracted image data so that the amount of encoded data is smaller than the amount of encoded data in the first encoding unit.
An image encoding and transmitting device comprising: an encoding section; and a multiplexing section that multiplexes and outputs each encoded data of the first encoding section and the second encoding section.