JPH01243796A - Picture encoding and transmitting device - Google Patents

Abstract

PURPOSE:To independently execute operation confirmation in respective transmitting part and receiving part by comparing encoding data with data for collation at the time of an operation test in the transmitting part, comparing a decoding video signal with a video signal for collation at the time of the operation test in the receiving part and respectively discriminating an operating condition. CONSTITUTION:At the time of the operation test in a transmitting part 4, test data generated in a first test signal generating part 17 are encoded by an encoding part 8. These encoding data and the data for collation, for which the test data are encoded in a first data checking part 19, are compared and the discrimination of the operating condition is executed according to the coincidence and discordance of both data. At the time of the operation test in a receiving part 5, the encoding data for the test generated in a second test signal generating part 18 are decoded in a decoding part 9 and the decoding video signal is obtained. This decoding video signal and the video signal for collation, for which the encoding data for test are decoded in a second checking part 20, are compared and the discrimination of the operating condition is executed according to the coincidence and discordance of both signals.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image encoding and transmitting apparatus that compresses the band of an input video signal and transmits the compressed video signal.

[Conventional technology]

FIG. 2 is a block diagram showing a conventional image encoding and transmitting device. In FIG. 1, 1 is an image encoding and transmitting device, 2 is a video camera that captures a target image, and 3 is a display device that displays a decoded image signal. 4 is a transmitter of the image encoding and transmitting device; 5 is a receiving portion of the image encoding and transmitting device 1; and 6 is an analog/digital unit (hereinafter referred to as 8 is an encoding unit that encodes the image data A/D converted by the A/D conversion unit 6 according to a predetermined encoding algorithm; 10 is encoded by the encoding unit 8; This is a transmission control transmitter that sends the encoded data to the transmission path.

On the other hand, 14 is a transmission control transmitter 10 and a transmission control receiver 11.
When performing a loopback test, select the line data input signal from the transmission path and the line data output signal from the transmission control transmitter 10, and select the line data output signal from the transmission control transmitter 10 for transmission control reception. This is a selector for input to the section 11. This transmission control receiving section 11 receives encoded data from a transmission path.

13 selects received data from the transmission control receiving section 11 and encoded data from the encoding section 8 when performing a return test of the encoding section 8 and the decoding section 9, and selects the received data from the encoding section 8 and the encoded data from the encoding section 8. This is a selector for inputting data to the decoding section 9.

This decoding section 9 decodes the encoded data received by the transmission control receiving section 11 according to a decoding algorithm that performs inverse processing of the aforementioned encoding algorithm, and outputs it to the selector 12 as a decoded video signal.

The selector 12 selects the decoded video signal from the decoder 9 and the decoded video signal from the A/D converter 6 when performing a return test of the A/D converter 6 and the digital/analog (hereinafter referred to as D/A) converter 7. This selector selects the video signal and inputs the video signal from the A/D converter 6 to the D/A converter 7.

The D/A converter 7 converts the video signal decoded by the decoder 9 into analog and outputs it to the monitor television 3.

Next, the operation will be explained. The video signal input from the video camera 2 is sent to the A/D converter 6 after A/D conversion.
The encoder 8 encodes the data according to a predetermined encoding algorithm.

Next, the encoded data is converted by the transmission control transmitter 10 into a signal that can be sent to the transmission line, and then output to the transmission line as line data.

Next, the operation of the receiving section 5 during normal operation will be explained. The selector 14 selects line data from the transmission path,
The line data is input to the transmission control receiving section 11.

Next, the transmission control receiving section 11 converts the line data into encoded data, and then the selector 13 selects this encoded data and inputs it to the decoding section 9.

The decoding unit 9 decodes the input encoded data according to a decoding algorithm that performs inverse processing of the encoding algorithm, and outputs a decoded video signal.

Next, the selector 12 selects this decoded video signal,
The D/A converter 7 converts it into an analog video signal and outputs it to the monitor television 3.

Next, the operation during the test will be explained. When testing the A/D converter 6 and D/A converter 7.

The video signal A/D converted by the A/D converter 6 is selected by the selector 12 and input to the D/A converter 7.

The signal is then D/A converted by a D/A converter 7 and output as an analog video signal. As a result, TV camera 2
The A/D conversion unit 6
Then, the operation of the D/A converter 7 is confirmed.

Next, when testing the encoding section 8 and the decoding section 9, the video signal input from the television camera 2 is A/D converted by the A/D conversion section 6, and then encoded by the encoding section 8. Select the converted data using the selector 13.

The data is input to the decoding section 9.

Next, the decoded video signal decoded by the decoder 9 is selected by the selector 12 and input to the D/A converter 7. D/A
The input decoded video signal is D/A converted in the converter 7 and outputted to the monitor television 3 as an analog video signal.

As a result, the image input by the television camera 2 decodes the encoded data that is A/D conversion amount encoded as it is, and
By displaying on the A conversion converter Nita TV 3, the encoding unit 8. The operation of the decoding unit 9 is confirmed.

Next, when testing the transmission control transmitter 10 and the transmission control receiver 11, the video signal input from the television camera 2 is A/D converted by the A/D converter 6, and then encoded by the encoder 8. After the encoded data is converted into a signal that can be sent to the transmission path by the transmission control transmitter 10, the selector 14 inputs the converted signal to the transmission control receiver 11.

The transmission control receiving section 11 converts the input signal back into encoded data, and the selector 13 selects this encoded data and inputs it to the decoding section 9 .

Next, the decoded video signal decoded by the decoder 9 is selected by the selector 12 and input to the D/A converter 7. D/A
The converter 7 converts the input decoded video signal into a D/A
It is converted and output to the monitor television 3 as an analog video signal.

As a result, the image input by the television camera 2 is A/D converted and encoded, and the signal output to the transmission path is input to the receiving unit 5 as it is. The input signal is then decoded by the receiving unit 5 and displayed on the TV monitor 3 after D/A conversion.
The operation of the transmitting section 4 and receiving section 5 is confirmed.

[Problem to be solved by the invention]

Since the conventional image encoding and transmitting device is configured as described above, the operation test is performed by repeating the loop test between the transmitting section 4 and the receiving section 5. When there is a problem, there is a problem in that it is impossible to confirm whether the cause of the problem is in the transmitter 4 or the receiver 5.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an image encoding and transmitting apparatus that can separately check the operation of the transmitting section and the receiving section.

[Means to solve the problem]

The image encoding and transmitting device according to the present invention includes a first test signal generating section that outputs test data to the encoding section instead of a signal from the A/D converting section in an operation test of the transmitting section;
In the operation test of the transmitting unit, in 1) in advance, the test data is encoded by the encoding unit, and the verification data encoded using the same encoding algorithm is stored, and the encoded data of the test data and the verification data are A first data inspection section that performs verification, a second test signal generation section that generates coded test data in the operation test of the receiving section, and a decoding algorithm that is the same as that used to decode the coded test data in the decoding section. A second device which stores the decoded verification video signal in advance and compares the verification video signal with the decoded test decoded data of the test encoded data generated by the second test signal generation section during the operation test of the receiving section. The system is equipped with a data inspection section.

[Effect]

During the operation test of the transmitting section in this invention, the test data generated by the first test signal generating section is encoded in the coding section, and the encoded data is tested in advance in the first data checking section using the same encoding algorithm as the encoding section. The data is compared with encoded verification data to determine whether it matches or does not match, and the encoded test data generated by the second test signal generator during the operation test of the receiver is decoded by the decoder. The second data inspection section compares the test encoded data with a collation video signal which has been decoded in advance using the same decoding algorithm as the decoding section, and determines the operating state based on whether they match or do not match.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is an image encoding and transmitting device, 2 is a television camera that captures a target image, 3 is a monitor television that displays a decoded image signal, 4 is a transmitting unit of the image encoding and transmitting device, and 5 is an image code 6 is an A/D converting the video signal input from the television camera 2;
This is the conversion section.

Reference numeral 17 denotes a first test signal generation section that generates test data during a transmission section operation test, and 15 a selector that inputs test data from the first test signal generation section 17 to the encoding section 8 during a transmission section operation test.

The encoding unit 8 encodes the A/D converted image data according to a predetermined encoding algorithm.

Reference numeral 10 denotes a transmission control transmitter for sending the encoded data encoded by the encoder 8 to the transmission path, and 19 transmits the test data generated by the first test signal generator 17 during the operation test of the transmitter to the encoder. This is a first inspection unit that compares encoded data with pre-stored verification data to determine the motion layer.

On the other hand, in the receiving unit 5, a transmission control receiving unit 11 receives line data from a transmission path and converts it into encoded data;
Reference numeral 18 denotes a second test signal generation unit that generates coded test data during a receiver operation test, and 16 inputs test coded data from the second test signal generator 18 to the decoder 9 during a receiver operation test. This is a selector that allows

The decoding section 9 decodes the encoded data converted from the line data by the transmission control receiving section 11 according to a decoding algorithm that performs inverse processing of the aforementioned encoding algorithm, and generates a decoded video signal.

It decodes the encoded data generated by the second test signal generating section 18 during the operation test of the receiving section 5.

Reference numeral 7 denotes a D/A converter that performs D/A conversion on the video signal decoded by the decoder 9 and outputs the D/A converter to the monitor television 3.

20 follows the same decoding algorithm as that used for decoding the encoded data from the transmission control receiving section 11 in the decoding section.
Collation data obtained by decoding the coded data generated by the second test signal generation section is stored in advance, and decoding data obtained by decoding the coded data generated by the second test signal generation section 18 during the operation test of the reception section 5 is stored in advance. This is to compare the video signal and verification data.

Next, the operation will be explained. A video signal input from the television camera 2 is A/D converted by an A/D converter 6, passed through a selector 15, and then encoded by an encoder 8 according to a predetermined encoding algorithm.

Next, the encoded data is sent to the transmission control transmitter 1.
After the data is converted into a signal that can be sent out to the transmission line by 0, it is sent out to the transmission line as line data.

Next, the receiving section 5 will be explained. The line data input from the transmission path is converted into encoded data by the transmission control receiving section 11, and then the encoded data is inputted to the decoding section 9 by the selector 16.

The input encoded data is decoded in a decoding section 9 according to a decoding algorithm that performs inverse processing of the encoding algorithm, thereby producing a decoded video signal.

This decoded video signal is converted into an analog video signal by the D/A converter 7 and then output to the monitor television 3.

Next, the operation of the transmitter 4 during an operation test will be explained. The test data generated by the first test signal generating section 17 is selected by the selector 15, inputted to the encoding section 8, and encoded by the encoding section 8.

Next, the encoded encoded data is compared in the first data inspection section 19 with verification data obtained by encoding test data using the same encoding algorithm as the encoding section 8, and the operating state is determined based on whether or not they match. Make a judgment.

Next, the operation of the receiving section 5 during an operation test will be explained. The encoded test data generated by the second test signal generator 18 is selected by the selector 16 and input to the decoder 9.

Next, the input test coded data is decoded by the decoding unit 9 to produce a composite video signal. This decoded video signal is compared in the second data inspection section 20 with a verification video signal obtained by decoding the test encoded data using the same decoding algorithm as the decoding section 9. Make a judgment.

〔Effect of the invention〕

As described above, according to the present invention, after the test data generated by the first test signal generating section is encoded by the encoding section during the transmission section operation test, the test data is encoded by the first data inspection section. This coded data is compared with verification data encoded using the same encoding algorithm, and the result of decoding the test coded data generated by the second test signal generation unit during the receiver operation test using the decoding unit. Since it is configured to check whether the operation is normal by comparing it with the verification data decoded using the same decoding algorithm as the decoding part,
It is possible to test the operation of only the transmitting section or the receiving section, making it possible to isolate defects in the encoding section and the decoding section, which has the effect of making it possible to discover defects in a short time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an image encoding and transmitting apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional image encoding and transmitting apparatus. 2 is a television camera, 4 is a transmitter, 5 is a receiver, 8 is an encoder, 9 is a decoder, 10 is a transmission control transmitter, 11 is a transmission control receiver, 17 is a first test signal generator, 18 is a second test signal generation section, 19 is a first data inspection section, and 20 is a second data inspection section. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent applicant Mitsubishi Electric Corporation

Claims (1)

[Claims] a first test signal generating section that generates test data during a transmitter operation test; and a first test signal generator that encodes the test data during the transmitter operation test and encodes and encodes a video signal from a television camera according to a predetermined encoding algorithm. an encoding unit that outputs data; a transmission control transmitting unit that outputs the encoded data to a transmission path; a first data inspection unit that compares encoded data obtained by encoding the test data of the first test signal generation unit in the encoding unit and the verification data to check whether or not they are the same during a transmission unit operation test; , a second test signal generating section that generates test coded data during a receiver operation test, a transmission control receiving section that receives line data from a transmission path and converts it into coded data, and this transmission control receiving section. a decoding unit that decodes the converted encoded data according to a decoding algorithm that performs inverse processing of the encoding algorithm and outputs a decoded video signal, and also decodes the test encoded data during the receiver operation test; , a decoded video signal in which the coded test data, which has been decoded in advance according to the decoding algorithm, is decoded and a video signal for verification is stored, and the coded test data is decoded by the decoding unit during the receiver operation test; and a second data inspection unit that compares the comparison video signal and the matching video signal to confirm whether or not they match.