JPH0287888A - High accuracy measuring system for image transmission characteristic - Google Patents
High accuracy measuring system for image transmission characteristicInfo
- Publication number
- JPH0287888A JPH0287888A JP24020488A JP24020488A JPH0287888A JP H0287888 A JPH0287888 A JP H0287888A JP 24020488 A JP24020488 A JP 24020488A JP 24020488 A JP24020488 A JP 24020488A JP H0287888 A JPH0287888 A JP H0287888A
- Authority
- JP
- Japan
- Prior art keywords
- test signal
- image transmission
- value
- transmission system
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 37
- 238000012360 testing method Methods 0.000 claims abstract description 53
- 238000013441 quality evaluation Methods 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000000691 measurement method Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 238000012937 correction Methods 0.000 abstract description 2
- 230000002194 synthesizing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔（既 要〕
画像伝送システムの画質評価を行う画像伝送特性の高精
度測定方式に関し、
手間が少なくて画像伝送システムの高精度の画質評′価
値を求めることが出来る、画像伝送特性の高精度測定方
式の提供を目的とし、
画像特性測定用の試験信号を発する試験信号発生器の試
験信号出力の、画質評価を行う項目の測定を第１の測定
器にて行い、測定した値を、該試験信号発生器の試験信
号出力に、付加部にて付加して画像伝送システムに入力
し、出力より、分離部にて付加した測定値を分離し、分
離した試験信号につき第２の測定器にて測定を行い、演
算部にて、該第２の測定器にて測定した値に対し、該分
離部にて分離した測定値による補正を行い画質評価の測
定値とする構成とする。[Detailed Description of the Invention] [(Already required)] Regarding a highly accurate measurement method of image transmission characteristics for evaluating the image quality of an image transmission system, it is possible to obtain a highly accurate image quality evaluation value of the image transmission system with less effort. , for the purpose of providing a high-accuracy measurement method for image transmission characteristics, a first measuring instrument measures items for image quality evaluation of the test signal output of a test signal generator that emits test signals for measuring image characteristics. , the measured value is added to the test signal output of the test signal generator in the adding section and inputted to the image transmission system, and from the output, the added measured value is separated in the separating section and the separated test signal is obtained. The value measured by the second measuring device is measured by the second measuring device, and the calculating section corrects the value measured by the second measuring device using the measured value separated by the separating section, and the measured value is used as the measured value for image quality evaluation. The configuration is as follows.
本発明は、ＨＤＴＶ （Ｈｉｇｈ−Ｄｉｆ ｉｎｉむ
ｉｏｎ −ＴＶ） やＥＤＴＶ （Ｅｘｔｅｎｄ
ｅｄ・Ｄｉ ｆ ｉｎ ｉ ｔ ｉ ｏｎ−ＴＶ）等の
高品質画像の、画像伝送システムにおける画質評価を行
う画像伝送特性の高精度測定方式の改良に関する。The present invention applies to HDTV (High-Difference)
ion-TV) and EDTV (Extend
The present invention relates to an improvement in a high-precision measurement method for image transmission characteristics for evaluating the image quality of high-quality images in an image transmission system, such as those used in high-quality images (e.g., ED, Difiniti on-TV), etc.
近年ＨＤＴＶやＥＤＴＶ等、画像装置の高品質化の動き
があるが、これに伴い画像伝送システムの画質評価にも
精密なものが要求されるようになってきた。In recent years, there has been a movement toward higher quality image devices such as HDTVs and EDTVs, and along with this, more precise image quality evaluations of image transmission systems are also required.
一般的に、画質評価の尺度としては、Ｓ ／Ｎ。Generally, the standard for evaluating image quality is S/N.
非直線歪の微分利得ＤＧ、ｉ分位相ＤＰ、直線歪のフレ
ームスロープ、ラインスロープが主として用いられてい
る。Mainly used are the differential gain DG of nonlinear distortion, the i-minute phase DP, and the frame slope and line slope of linear distortion.
この為に、画像特性測定用の試験信号を発生ずる試験信
号発生器より、各項目に適した試験信号を出力して画像
伝送システムの画質評価を行うが、該試験信号発生器の
出力でも、内部の増幅器の雑音、非直線特性、回路の容
量成分、インダクタンス成分の影響等により、試験信号
発生時に既に、劣化した上記の測定項目の成分を含んで
いるので、高精度の画質評価を行うには、この劣化した
成分も考慮する必要があるが、手間が少なくて考慮出来
ることが望ましい。For this purpose, the image quality of the image transmission system is evaluated by outputting test signals suitable for each item from a test signal generator that generates test signals for measuring image characteristics. Due to internal amplifier noise, non-linear characteristics, circuit capacitance components, inductance components, etc., the test signal already contains degraded components of the above measurement items when it is generated, so it is difficult to perform high-precision image quality evaluation. Although it is necessary to take this degraded component into account, it is desirable to be able to take it into account with less effort.
以下従来例を図を用いて説明する。 A conventional example will be explained below using figures.
第３図は従来例のブロック図である。FIG. 3 is a block diagram of a conventional example.
第３図に示す、画像送信装置１０．伝送路１１゜画像受
信装置１２よりなる画像伝送システムの画質評価を行う
場合、従来は、第３図に示すスイッチ１４を点７線側と
し、試験信号発生器１の試験信号発生時に既に含まれて
いる劣化した成分の値を、各画質評価項目毎に測定器２
で測定しておき、スイッチ１４を実線側とする。Image transmitting device 10 shown in FIG. When evaluating the image quality of an image transmission system consisting of a transmission path 11° and an image receiving device 12, conventionally, the switch 14 shown in FIG. Measurement device 2 measures the values of degraded components for each image quality evaluation item.
, and set the switch 14 to the solid line side.
そして、試験信号発生器１よりの画質評価項目毎に試験
信号を画像伝送システムに入力し、出力の、試験信号発
生器１の試験信号発生時に既に含まれている劣化した成
分及び画像伝送システムによる劣化成分との合成した値
を測定器５にて測定し、測定器１で測定した値を電話等
で連絡して貰い、補正して画像伝送システムの画質評価
値を求めでいた。Then, the test signal for each image quality evaluation item from the test signal generator 1 is input to the image transmission system, and the output is determined by the deteriorated components already included when the test signal generator 1 generates the test signal and the image transmission system. The combined value with the deterioration component was measured with the measuring device 5, and the value measured with the measuring device 1 was communicated by telephone or the like, and the image quality evaluation value of the image transmission system was obtained by correcting it.
しかしながら、従来の方法では、操作者が２度測定器に
て測定し、又操作者が補正をせねばならず、手間がかか
る問題点がある。However, in the conventional method, the operator has to measure twice with a measuring device and also has to make corrections, which is a problem that requires time and effort.
本発明は、手間が少なくて画像伝送システムの高精度の
画質評価値を求めることが出来る、画像伝送特性の高精
度測定方式の提供を目的としている。An object of the present invention is to provide a highly accurate measurement method for image transmission characteristics, which allows highly accurate image quality evaluation values of an image transmission system to be obtained with less effort.
第１図は本発明の原理ブロック図である。 FIG. 1 is a block diagram of the principle of the present invention.
第１図に示す如く、画像特性測定用の試験信号を発する
試験信号発生器１の試験信号出力の、画質評価を行う項
目の測定を第１の測定器２にて行い、測定した値を、該
試験信号発生器１の試験信号出力に、付加部３にて付加
して画像伝送システムに人力する。As shown in FIG. 1, the first measuring instrument 2 measures the test signal output of the test signal generator 1 that generates the test signal for measuring image characteristics, and the measured values are as follows: The test signal output from the test signal generator 1 is added to the test signal output by the adding section 3 and inputted to the image transmission system.
そして、出力より分離部４にて、付加した測定値を分離
し、分離した試験信号につき第２の測定器５にて測定を
行い、演算部６にて、該第２の測定器５にて測定した値
に対し、該分離部４にて分離した測定値による補正を行
い画質評価の測定値とする。Then, a separation section 4 separates the added measurement value from the output, a second measurement device 5 measures the separated test signal, and a calculation section 6 uses the second measurement device 5 to measure the separated test signal. The measured values are corrected using the measured values separated by the separating section 4, and are used as measured values for image quality evaluation.
本発明によれば、試験信号発生器１の、試験信号発生時
に既に含まれている劣化した画質評価項目の成分を、第
１の測定器２にて測定した値を、該試験信号発生器１の
試験信号出力に、付加部３にて付加して画像伝送システ
ムに入力し、出力より、分離部４にて、付加した測定値
を分離し、分離した試験信号より、試験信号発生器１の
試験信号発生時に既に含まれている劣化成分及び画像伝
送システムによる劣化成分の合成の画質評価項目を第２
の測定器５にて測定を行い、演算部６にて、該第２の測
定器５にて測定した値に対し、該分離部４にて分離した
測定値による補正を行い画質評価の測定値としている。According to the present invention, the value measured by the first measuring device 2 of the degraded image quality evaluation item component that is already included when the test signal generator 1 generates the test signal is measured by the test signal generator 1. The adding section 3 adds the added measurement value to the test signal output and inputs it to the image transmission system, and the separating section 4 separates the added measurement value from the output. The second image quality evaluation item is the combination of the degraded components already included when the test signal is generated and the degraded components produced by the image transmission system.
Measurement is performed with the second measuring device 5, and the calculating section 6 corrects the value measured with the second measuring device 5 using the measured value separated by the separating section 4 to obtain a measured value for image quality evaluation. It is said that
即ち、特に手間をかけずとも、演算部６の出力にて、画
像伝送システムの高精度な画質評価値を得ることが出来
る。That is, a highly accurate image quality evaluation value of the image transmission system can be obtained from the output of the calculation unit 6 without any particular effort.
以下本発明の１実施例に付き図に従って説明する。 An embodiment of the present invention will be described below with reference to the accompanying drawings.
第２図は本発明の実施例のブロック図である。FIG. 2 is a block diagram of an embodiment of the invention.
第２図では、試験信号発生器１・の、試験信号発生時に
既に含まれている劣化した画質評価項目の成分の測定を
、測定器２にて行い、測定した値に対応する出力電圧値
を、符号器７にて数値パルスよりなる符号に符号化し、
挿入器８に入ツノする。In FIG. 2, the test signal generator 1 measures components of degraded image quality evaluation items that are already included when the test signal is generated, using the measuring device 2, and calculates the output voltage value corresponding to the measured value. , encoded by an encoder 7 into a code consisting of numerical pulses,
Insert into inserter 8.
挿入器８では、数値パルスを挿入する位置を示す認識パ
ターンを発生させ、このパターンと数値パルスよりなる
符号を直列信号とし、試験信号発生器１から出力されて
いる試験信号の垂直同期信号部の、垂直同期検出に影♂
のない範囲に、文字放送と同様の方法にて、加算部９を
用いて付加し、画像送信装置１０．伝送路１１３画像画
像送信装置よりなる画像伝送システムに入力する。The inserter 8 generates a recognition pattern indicating the position at which a numerical pulse is to be inserted, uses the code consisting of this pattern and the numerical pulse as a serial signal, and converts the vertical synchronization signal portion of the test signal output from the test signal generator 1 into a serial signal. , affects vertical synchronization detection ♂
The image transmitting device 10 . The transmission line 113 inputs the image to an image transmission system consisting of an image transmission device.
該システムの出力では、検出分離部４にて、垂直同期信
号部から、数値パルスを挿入した位置を示す認識パター
ンを見つけ、付加された数値パルスよりなる符号を検出
分離して復号器１３に人力し、分離された試験信号は測
定器５に入力する。In the output of the system, the detection and separation section 4 finds a recognition pattern indicating the position where the numerical pulse is inserted from the vertical synchronization signal section, detects and separates the code consisting of the added numerical pulse, and manually inputs it to the decoder 13. The separated test signal is then input to the measuring device 5.
測定器５では、入力した試験信号より、試験信号発生器
ｌの試験信号発生時に既に含まれている劣化成分及び画
像伝送システムによる劣化成分の合成の画質評価項目を
測定し、演算部６に入力する。The measuring device 5 measures the image quality evaluation items of the degraded components already included when the test signal generator l generates the test signal and the synthesized degraded components by the image transmission system from the input test signal, and inputs the measured results to the calculation unit 6. do.
一方、復号器１３では、入力した数値パルスよりなる符
号を復号化して数値化し演算部６に入力する。On the other hand, the decoder 13 decodes the code made up of the input numerical pulses, converts them into numerical values, and inputs them to the arithmetic unit 6.
演算部６では、測定器５にて測定した試験信号発生器１
の試験信号発生時に既に含まれている劣化成分及び画像
伝送システムによる劣化成分の合成値に対し、復号器１
３より入力した試験信号発生器１の試験信号発生時に既
に含まれている劣化成分値による補正を行い、画像伝送
システムの高精度の画質評価値を出力する。In the calculation unit 6, the test signal generator 1 measured by the measuring device 5
The decoder 1
3, the test signal generator 1 outputs a highly accurate image quality evaluation value of the image transmission system.
従って、手間が少なくて、画像伝送システムの高精度の
画質評価値を得ることが出来る。Therefore, a highly accurate image quality evaluation value of the image transmission system can be obtained with less effort.
以上詳細に説明せる如く本発明によれば、手間が少なく
て、画像伝送システムの高精度の画質評価値を得ること
が出来る効果がある。As explained in detail above, according to the present invention, there is an effect that a highly accurate image quality evaluation value of an image transmission system can be obtained with less effort.
は挿入器、 は加算部、 ０は画像送信装置、 ■は伝送路、 ２は画像受信装置、 ３は復号器、 ４はスイッチを示す。is an inserter, is the addition part, 0 is an image transmitting device, ■ is a transmission line, 2 is an image receiving device; 3 is a decoder, 4 indicates a switch.
第１図は本発明の原理ブロック図、
第２図は本発明の実施例のブロック図、第３図は従来例
のブロック図である。
図において、
１は試験信号発生器、
２．５は測定器、
３は付加部、
４は分離部、検出分離部、
６は演算部、
７は符号器、FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a block diagram of a conventional example. In the figure, 1 is a test signal generator, 2.5 is a measuring device, 3 is an addition section, 4 is a separation section, a detection separation section, 6 is a calculation section, 7 is an encoder,
Claims (1)
、 画像特性測定用の試験信号を発する試験信号発生器（１
）の試験信号出力の、画質評価を行う項目の測定を第１
の測定器（２）にて行い、測定した値を、該試験信号発
生器（１）の試験信号出力に、付加部（３）にて付加し
て画像伝送システムに入力し、出力より、分離部（４）
にて付加した測定値を分離し、分離した試験信号につき
第２の測定器（５）にて測定を行い、演算部（６）にて
、該第２の測定器（５）にて測定した値に対し、該分離
部（４）にて分離した測定値による補正を行い画質評価
の測定値とすることを特徴とする画像伝送特性の高精度
測定方式。[Claims] When measuring highly accurate transmission characteristics of an image transmission system, there is provided a test signal generator (1) that generates a test signal for measuring image characteristics.
) The first step is to measure the image quality evaluation items of the test signal output.
The measured value is added to the test signal output of the test signal generator (1) by the addition section (3) and input to the image transmission system, and from the output, the measured value is separated. Part (4)
Separate the measurement value added at , measure the separated test signal with a second measuring device (5), and measure it with the second measuring device (5) at the calculation section (6). A high-precision measurement method for image transmission characteristics, characterized in that the value is corrected using the measurement value separated by the separation unit (4) and used as a measurement value for image quality evaluation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24020488A JPH0287888A (en) | 1988-09-26 | 1988-09-26 | High accuracy measuring system for image transmission characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24020488A JPH0287888A (en) | 1988-09-26 | 1988-09-26 | High accuracy measuring system for image transmission characteristic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0287888A true JPH0287888A (en) | 1990-03-28 |
Family
ID=17056002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24020488A Pending JPH0287888A (en) | 1988-09-26 | 1988-09-26 | High accuracy measuring system for image transmission characteristic |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0287888A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5446492A (en) * | 1993-01-19 | 1995-08-29 | Wolf; Stephen | Perception-based video quality measurement system |
-
1988
- 1988-09-26 JP JP24020488A patent/JPH0287888A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5446492A (en) * | 1993-01-19 | 1995-08-29 | Wolf; Stephen | Perception-based video quality measurement system |
| US5596364A (en) * | 1993-10-06 | 1997-01-21 | The United States Of America As Represented By The Secretary Of Commerce | Perception-based audio visual synchronization measurement system |
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