KR0165308B1 - Apparatus and method for controlling and analyzing image signal - Google Patents

Abstract

The present invention relates to a method and apparatus for detecting, analyzing, and adjusting a video signal, comprising: a synchronous separation means for separating a composite synchronous signal and a vertical synchronous signal from a composite video signal, and synchronously triggering a section having a video signal Trigger generation means for generating a signal, video signal output means for outputting a predetermined video signal, analog-digital conversion means for converting an analog video signal emitted by the video signal output means into a digital signal, and a predetermined video signal. A video signal reference level storage means for storing a reference level of the signal, a signal level comparison means for comparing the digital signal level of the video signal with the reference level, an execution command to adjust a signal level of the video signal, or an overall execution process Execution command control means for terminating the operation, and control instructions of the execution command control means. Solution means for adjusting the video signal or terminating the overall performance of the video signal.

Therefore, the present invention builds an automated system to achieve unmanned production line, perform automatic analysis and adjustment of the video signal level, implement quality uniformity, shorten the working time in the production line, conventional digital The use of an oscilloscope has the effect of providing cost-effective production efficiency.

Description

Image signal analysis and adjustment method and device

1 shows a block diagram of a device according to the prior art.

2 is a block diagram illustrating a video signal analysis and adjustment method according to the present invention.

3 is a diagram illustrating a reference clock signal, a write signal, a gate signal, and an output signal that have been programmed prior to the description of generating a trigger pulse in synchronization with a section having a video signal among the composite video signals. Figure 1 shows an embodiment for explaining the relationship.

4 is a block diagram illustrating a method for generating a trigger pulse in synchronization with a section in which a video signal is included in a composite video signal.

5 is a view showing waveforms for each block according to FIG.

6 is a diagram illustrating an apparatus for analyzing and adjusting video signals according to the present invention.

FIG. 7A is a diagram for explaining the synchronous separation means of FIG.

FIG. 7B is a waveform diagram for explaining the synchronization separating means of FIG.

8 is a view for explaining the trigger generating means of FIG.

The present invention relates to a method and apparatus for detecting and analyzing and adjusting video signals, and more particularly, to a method and apparatus for designating a predetermined video signal using a trigger signal and analyzing and adjusting the video signal. .

In general, manufacturers handling video signals output video signals using a pattern generator, and analyze the video signals directly with the naked eye using an oscilloscope or the like, if necessary, to analyze and adjust the video signals output therefrom. As the coordinator of.

The conventional video signal analysis and adjustment method and apparatus are accompanied with the following problems.

First, the digital oscilloscope used in the analysis of the video signal detected by the video signal analysis and adjustment device is too expensive in terms of price. Second, the digital oscilloscope is not very fast in terms of performance. In addition, the quality is influenced by the judgment of the operator by performing manual adjustment by visual observation of the operator. This results in a lack of uniformity of quality or uniform data, and thus a decrease in productivity is accompanied by a fatal problem.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, to automatically analyze the video signal output from the pattern generator, and also to set a predetermined reference level and to automatically detect the detected video signal. It is to build an automation system that can be adjusted.

Another object of the present invention is to build an automation system as described above, so that it does not use expensive digital oscilloscopes as in the prior art so as to be a factor of cost reduction in terms of economy.

Still another object of the present invention is to build an automated system as described above to realize unmanned production lines.

Another object of the present invention is to discriminate and analyze manually, as in the prior art, and to improve the non-uniformity of product quality accompanied by manual operation, and to build the above-mentioned automation system to a predetermined level. It can be made uniform, so that the uniformity of product quality can be maintained and data can be made.

In addition, another object of the present invention is to reduce the working time is not comparable to the conventional technique performed by manual in terms of analysis and adjustment time of the video signal to be analyzed by building the automated system as described above To make it possible.

Then, the method according to the object of the present invention as described above, in the method for analyzing the level of the video signal consisting of the chroma signal and the luminance signal, and for adjusting the level of the video signal to a predetermined reference level, A trigger is generated in synchronization with a predetermined section of the video signal to emit an analog signal to be measured (200), converts the extracted analog video signal into a digital signal (210), and converts the converted digital signal level (signal to be measured). Level) and a predetermined signal level as a predetermined level (220), and if the difference between the compared reference signal level and the signal level to be measured falls within the tolerance range, it is determined as 'match', otherwise 'unmatched' (230), if the signal level to be measured is lower than the reference signal level because the judgment is 'unmatched', one quantized level adjustment section is made in the positive direction. The signal level to be measured is raised by increasing the signal level to be measured, and if the signal level to be measured is higher than the reference signal level, by adjusting the quantized level adjustment section in the negative direction to lower the signal level to be measured. Readjust the measured signal level (200), and repeat the readout process (200) to readjustment process (240) of the analog video signal until the level deviation falls within the tolerance range, and the level deviation is allowed. When entering the error range is characterized in that the overall process is terminated (250).

In addition, the apparatus according to the object of the present invention includes a composite video signal generating means for generating a predetermined composite video signal, and analyzes the level of the video signal generated by the composite video signal generating means, An apparatus for adjusting to a level, the apparatus comprising: sync separation means for separating a composite sync signal and a vertical sync signal from a composite video signal generated by the composite video signal generating means; Trigger generation means for generating a trigger in synchronization with a section in which a video signal is found among the section of a composite video signal generated by the composite video signal generation means; Video signal emitting means for emitting a predetermined video signal in synchronization with a trigger pulse generated by said trigger generating means; Analog-digital conversion means for converting the analog video signal emitted by the video signal emitting means into a digital signal; Video signal reference level storage means for storing the reference level of the predetermined video signal in the form of a digital signal; Signal level comparison means for comparing the digital signal level of the video signal converted by the analog-digital conversion means with a reference level stored in the video signal reference level storage means; The signal level difference value (the level value obtained by subtracting the reference level from the digital signal level of the video signal) between the reference level compared by the signal level comparison means and the digital signal level of the video signal is outside the predetermined tolerance range. Execution instruction control means for giving an execution instruction to adjust the signal level or for terminating the overall execution process if it is within a predetermined tolerance range; And re-adjust the composite video signal by performing level up / down to adjust the signal level of the video signal to the reference level by the control command of the execution command control means, or adjusting the signal level of the video signal to terminate the overall execution process. Means;

Hereinafter, the present invention will be described in more detail with reference to the drawings. First, the prior art will be described first for correct understanding.

1 shows a block diagram of a device according to the prior art. In Fig. 1, reference numeral 10 denotes a grid pattern on the CRT tube of a receiver by applying a signal similar to television radio waves to an antenna terminal or an image amplifier of a television receiver, thereby testing linearity of the deflection circuit, frequency characteristics of the image amplifier, and synchronous separation. Pattern generator, a test device used to adjust the circuit, 12 is a dummy printed circuit board set in the record mode, and 14 is set in the play back mode. It is a target printed circuit board, 16 is an oscilloscope, and 18 is predetermined manual operation means, such as an operator.

A color pattern is sent to the pseudo printed circuit board 12 (dummy P. B.) by the color pattern generator 10, and the pseudo printed circuit board 12 (dummy P. B.) Is set to 'record' mode.

The target printed circuit board 14 (Tarquet P. C.) in which the radio frequency signal from the pseudo printed circuit board 12 (dummy P. c.) Is placed in a 'play back' mode. B.) And an image signal from the target printed circuit board 14 (tagget. B.) To the oscilloscope 16 so that the operator can operate the oscilloscope 16. As shown in Fig. 2, the adjusting element is manipulated so as to analyze or determine whether the video signal appears on the oscilloscope 16 at a level for the purpose.

This has a problem of productivity degradation due to the price problem, processing speed problem and quality non-uniformity of the digital oscilloscope as described above.

The present invention is a circuit for analyzing, inspecting and adjusting how the chroma signal and the luminance signal are mixed among the components of a video signal, so that video tape recorders and camcorder manufacturers can analyze such components. It is to analyze and adjust the video signal automatically because it is possible to analyze, inspect and adjust the video signal by delaying the trigger detection circuit and trigger by analyzing the video signal visually using a woofer.

Next, the present invention will be described with reference to the drawings.

2 is a block diagram illustrating a video signal analysis and adjustment method according to the present invention. In FIG. 2, reference numeral 200 is a step of generating a trigger to be measured by generating a trigger in synchronization with a predetermined section of the composite video signal.

Uniformity of quality is inevitable for imaging devices shipped in large quantities from manufacturers. In particular, the uniformity of the video signal level is a very important technique in the uniformity of quality. The present invention is to meet this technical need. That is, to equalize the level of the video signal. In order to equalize the level of the video signal, analysis of the video signal must be preceded before adjustment. In addition, in order to analyze the video signal, a part of the video signal should be removed and placed on the cutting board. This operation means the emission of analog video signal. The output of the video signal is not a difficult task. The composite video signal has a section with a video signal and a section without a video signal. The video signal can be emitted by generating a trigger pulse in synchronization with the section in which the video signal is present in the composite video signal. Then, the present invention proposes the following method in order to generate a trigger pulse in synchronization with a section having a video signal in the composite video signal. It demonstrates with reference to drawings.

3 is a diagram illustrating a reference clock signal, a write signal, a gate signal, and an output signal that have been programmed prior to the description of generating a trigger pulse in synchronization with a section having a video signal among the composite video signals. Figure 1 shows an embodiment for explaining the relationship.

When the write signal 302 falls low under the condition that the reference clock 300 is input, the data value '4' is inputted. When the gate signal 304 is raised, the down counting during the input data value '4' ( An output signal 306 for performing down counting is set. In another embodiment (not shown), when the write signal 302 falls low under the condition that the reference clock 300 is input, the data value '3' is inputted, and the gate signal 304 is input. Is set to an output signal 306 which performs down counting for the input data value '3'.

Next, the trigger generating means will be described using the gate signal and the output signal programmed as described above.

4 is a block diagram illustrating a method for generating a trigger pulse in synchronization with a section in which a video signal is included in a composite video signal. For convenience of description, FIG. 4 will be described in parallel with FIG. 5.

FIG. 5 is a diagram showing waveforms for blocks, respectively, in accordance with FIG.

In FIG. 4, reference numeral 400 is a step for performing synchronous separation of the composite video signal. In the synchronous separation, there is amplitude separation for separating the video signal and the synchronous signal, and frequency separation for separating the horizontal synchronous signal and the vertical synchronous signal among the synchronous signals. 402 denotes a first gate signal obtained by inverting the vertical synchronization signal generated by the synchronization separation.

In FIG. 5, 500 shows a vertical synchronization signal, and 502 shows a first gate signal inverting the vertical synchronization signal 500. 404 outputs a first output signal in response to the first gate signal. At this time, the first output signal is output by delaying the signal to a section in which there is no video signal (first paper research period). In Figure 5, 504 is a waveform showing this. 406 denotes the first output signal as a second gate signal. Its waveform is the same as the 504 waveform of FIG. 408 outputs a second output signal in response to the second gate signal. At this time, the second output signal is output by delaying the signal to the section in which the video signal is present (second paper research period). In Figure 5, 506 is a waveform showing this. 410 inverts the second output signal and outputs the second output signal.

In Figure 5, 508 is a waveform showing this. 412 generates a third gate signal through the NAND gate using the second output signal and the composite synchronization signal as input terminals. The waveform of the composite synchronization signal is shown at 510 in FIG. The waveform of the third gate signal is shown at 512 in FIG. 414 outputs a third output signal in response to the third gate signal. At this time, the waveform of the composite video signal is shown in the waveform 514 in FIG. The third output signal is output by delaying the signal to a point (between the third paper studies) in which the video signal is analyzed. The waveform of the third output signal is shown at 516 waveform in FIG. The third output signal eventually becomes a trigger signal. Then, in the setting between the first paper research, the second paper research, and the third paper research, the section setting can be programmed and specified as many times as possible. So far, the method of generating a trigger has been described. Then, the trigger signal (third output signal) is generated in synchronization with the analog video signal to be measured. Referring to the figure as a waveform, waveforms 514 and 516 of FIG. 5 correspond to this. So far, 200 steps of FIG. 2 have been described. Next, FIG. 2 is explained.

In FIG. 2, step 210 is a step of converting the analog video signal measured in step 200 into a digital signal. That is, converting the analog image signal of the section to be measured in the waveform 516 of FIG. 5 into a digital signal. In step 220, the digital signal level (measured signal level) converted in step 210 is compared with a signal level set as a reference level. Here, the reference signal level means a level that becomes a standard for maintaining the uniformity of the mass shipment quality.

In step 230, if the difference between the reference signal level and the signal level to be measured in step 220 falls within the set tolerance range, it is determined as 'match'; otherwise, it is determined as 'inconsistency'. Step 240 corresponds to a case where it is determined that there is a mismatch in the determination of step 230. There can be two reasons for 'inconsistency'. The first reason is that the signal level under test is lower than the tolerance beyond the reference signal level, and the second reason is the reverse. In the first case, the signal level to be measured may be raised. In the second case, the signal level to be measured can be lowered. Here, raising and lowering the signal level is to readjust the level corresponding to the quantized predetermined value. Step 250 corresponds to a case where it is determined as 'match' in the determination of step 230. This step ends the overall execution process.

So far, the method of analyzing and adjusting the video signal according to the present invention has been described. Then, a description will now be given of the analysis and adjustment of the video signal according to the present invention.

6 is a diagram illustrating an apparatus for analyzing and adjusting video signals according to the present invention. In FIG. 6, reference numeral 600 denotes a synchronous separation means for separating and outputting a composite synchronous signal and a vertical synchronous signal from the composite video signal, and 602 denotes a video signal in the composite video signal section generated by the composite video signal generating means. Trigger generating means for generating a trigger in synchronism with an interval, 604 is a video signal emitting means for emitting a predetermined video signal in synchronization with the trigger pulse generated by the trigger generating means 602 and the video signal, 606 is an analog-digital conversion means for converting the analog video signal emitted by the video signal emitting means 604 into a digital signal, and 608 is a video signal reference storing a reference level of a predetermined video signal as a digital signal. Level storage means, and 610 denotes a digital signal level of the image signal converted by the analog-digital conversion means 606 and the image. Signal level comparing means for comparing the reference level stored in the signal reference level storing means, and 612 denotes a signal level difference value between the reference level compared by the signal level comparing means 610 and the digital signal level of the video signal. If the digital signal level of the video signal is subtracted from the reference level) to give an execution command to adjust the signal level of the video signal if it is outside the predetermined tolerance range, or if it is within the predetermined tolerance range, Execution command control means for terminating, and 614 is for adjusting the composite video signal by performing level up / down to adjust the signal level of the video signal to the reference level by the control command of the execution command control means 612; Or signal level adjusting means of the video signal for terminating the overall execution process.

The present invention analyzes and adjusts an input composite video signal.

A composite video signal is generated using a pattern generator to analyze the level of the video signal and the like and to adjust it to a predetermined reference value. To this end, the present invention emits a video signal that is a predetermined analysis target, compares the level of the extracted video signal with a predetermined reference level, analyzes the level deviation of the video signal, and narrows the analyzed level deviation within a tolerance range. It is trying to equalize.

In Fig. 6, the means for generating the composite video signal uses a pattern generator for generating a signal similar to television radio waves. The composite video signal generates the composite synchronous signal and the vertical synchronous signal by synchronous separation means 600 for separating the video signal and the composite synchronous signal by amplitude separation and separating the horizontal synchronous signal and the vertical synchronous signal by frequency separation. do. 7a and 7b are cited to show this.

FIG. 7A is a diagram for explaining the synchronous separation means of FIG.

FIG. 7B is a waveform diagram for explaining the synchronization separating means of FIG. In FIG. 7A, the composite video signal generated by the composite image generating means using the pattern generator separates the video signal and the composite synchronous signal by amplitude separation, and separates the vertical synchronous signal and the horizontal synchronous signal by frequency separation. In the present invention, as will be described later, the trigger pulse is synchronized to the section in which the video signal exists by using the composite synchronization signal and the vertical synchronization signal.

8 is a view for explaining the trigger generating means of FIG.

In FIG. 8, reference numeral 800 denotes a vertical synchronization signal output from the synchronization separating means 600. FIG. Its waveform is shown at 500 waveform in FIG. 5 as described above. The first gate signal 804 is output through the first inverting means 802 for inverting the vertical synchronization signal 800. Its waveform is seen in the 502 waveform as described above. When the first gate signal 804 rises from the low state to the high state (reference numeral 520 in FIG. 5), the control means 806 includes the first delay means 808. The first output signal 810 is lowered from the high state to the low state to maintain the low state until the section without the image signal (first inter-study period), and then rises from the low state to the high state again after the first delay period. . Its waveform is shown at 504 waveform in FIG. The first output signal 810 becomes a second gate signal 812.

When the second gate signal 812 rises from a low state to a high state (reference numeral 522 in FIG. 5), the second output signal 814 descends from a high state to a low state and includes an image signal section (first And keep it low until it is high. This means that the control means 806 controls the above process through the second delay means 816. Its waveform is shown at 506 waveform in FIG. The second output signal 814 is inverted by the second inverting means 818 to output the second 'output signal 820. The second 'output signal 820 is shown at 508 waveform in FIG. The second 'output signal 820 and the composite synchronization signal 822 become input signals of the NAND gate 824, and the NAND gate 824 outputs the third gate signal 826. The waveform of the composite synchronization signal 822 is shown at 510 waveform of FIG. 5, and the third gate signal 826 is shown at 512 waveform of FIG. 5. When the third gate signal 826 rises from the low state to the high state (reference numeral 524 in FIG. 5), the third output signal 828 descends from the high state to the low state so that a predetermined period in which the image signal is present. Keep low until (Tritorial Paper Research). This means that the control means 806 controls the above process through the third delay means 830. The third output signal 828 soon becomes a trigger pulse. That is, the generation of the trigger pulse in synchronization with the section in which the video signal is present is possible by adjusting the delay section. In particular, the setting of the third paper research is an important problem to select the section of the video signal to be analyzed.

As described above, the video signal emitting means 604 of FIG. 6 should be preceded by generating a trigger pulse in a section in which the video signal exists in the composite video signal. Referring to FIG. 5, a trigger pulse may be generated in a section in which a video signal exists in the composite video signal 514, and a section to be measured may be emitted.

The analog-digital converting means 606 of FIG. 6 is for converting the predetermined analog signal emitted from the video signal emitting means 604 into a digital signal. The video signal reference level storage means 608 of FIG. 6 is a level of the video signal which has been previously selected by the manufacturer as a reference level in the video signal. That is, it is a means for storing the level which becomes a reference | standard for the equalization of the video signal level in the product shipped in large quantities. The signal level comparison means 610 is a means for comparing the digital signal level of the video signal to be measured output from the analog-digital conversion means 606 with the reference level stored in the video signal reference level storage means 608.

The execution command control means 621 is at the two levels compared in the signal level comparison means 610, and if the result of the comparison is within the tolerance range, the execution command control means 612 terminates the various means, and If the result is outside the tolerance range, the execution command control means 612 adjusts the signal level of the video signal.

The execution command control means 612 makes a predetermined quantized adjustment interval when transmitting a predetermined adjustment command to the signal level adjusting means 614 of the video signal. That is, when the tolerance of the signal level is A, B smaller than A is set to be one adjustment interval. As an example, if the signal level to be measured is higher than the reference level by C, the composite signal may be adjusted from the input of the composite video signal of FIG. 6 through the synchronization separating means 600 to the signal level adjusting means 614 of the video signal. If the video signal is readjusted once, there will be a level drop from C to B. If the value is larger than A, the same process will be further performed.

On the other hand, if this value is less than A, the overall process is terminated because the level deviation of both signals is within the tolerance range.

The present invention configured as described above is to build an automated system to achieve unmanned production line, to perform automatic analysis and adjustment of the image signal level, to realize the quality uniformity, to reduce the working time in the production line, There is an effect of providing a cost-effective production efficiency by not using a conventional digital oscilloscope.

Claims (5)

A method for analyzing a level of a video signal composed of a chroma signal and a luminance signal and adjusting the level of the video signal to a predetermined reference level, wherein the trigger is generated in synchronization with a predetermined section of the composite video signal to be measured. Outputs an analog signal, converts the extracted analog video signal into a digital signal, compares the converted digital signal level (a signal level to be measured) with a signal level set as a reference level, and compares the compared reference signal level If the difference between the signal level and the measured signal level is within the tolerance range, it is determined as 'match'; otherwise, it is determined as 'inconsistency', and if the signal level to be measured is lower than the reference signal level in the 'unmatch' of the judgment By adjusting one quantized level adjustment section in the positive direction, the signal level to be measured is raised, and If it is higher than the signal level, one quantized level adjustment section is adjusted in the negative direction to lower the signal level to be readjusted and to readjust the signal level to be measured, and output the analog video signal to the adjusted signal level. Repeat steps 200 through 240 until the level deviation falls within the tolerance range, and when the level deviation falls within the tolerance range, the overall process is terminated (250). Analysis and Adjustment Methods. A composite video signal generating means for generating a predetermined composite video signal, comprising: a device for analyzing a level of a video signal generated by the composite video signal generating means and adjusting a predetermined reference level; Synchronous separation means for separating the composite synchronous signal and the vertical synchronous signal from the composite video signal generated by the video signal generating means; Trigger generation means for generating a trigger in synchronization with a section in which a video signal is found among the section of a composite video signal generated by the composite video signal generation means; Video signal emitting means for emitting a predetermined video signal in synchronization with a trigger pulse generated by said trigger generating means; Analog-digital converting means for converting the analog video signal emitted by said video signal emitting means into a digital signal; Video signal reference level storage means for storing the reference level of the predetermined video signal in the form of a digital signal; Signal level comparison means for comparing the digital signal level of the video signal converted by the analog-digital conversion means with a reference level stored in the video signal reference level storage means; The video signal when the reference level compared by the signal level comparison means falls outside the predetermined tolerance range in the signal level difference value (the level value obtained by subtracting the reference level from the digital signal level of the video signal) of the video signal. Execution command control means for giving an execution command to adjust the signal level of the signal or terminating the overall execution process if it is within a predetermined tolerance range; And re-adjust the composite video signal by performing level up / down to adjust the signal level of the video signal to the reference level by the control command of the execution command control means, or adjusting the signal level of the video signal to terminate the overall execution process. Apparatus for analyzing and adjusting video signals comprising means. 3. The apparatus of claim 2, wherein the trigger generating means comprises: first inverting means for inverting the vertical synchronous signal output from the synchronous separating means and outputting a first gate signal; When the first gate signal output by the first inverting means rises from a low state to a high state, the first gate signal is inverted from a high state to a low state, and the signal is delayed by maintaining the low state until a section without an image signal. First delay means for outputting an output signal or a second gate signal; When the first output signal or the second 'gate signal output by the first delay means rises from the low state to the high state, the state is inverted from the high state to the low state, and the low state is maintained until the section in which the image signal is present. Second delay means for delaying the signal and outputting a second 'output signal; Second inverting means for inverting the second output signal output by the second delay means and outputting a second output signal; The second output signal outputted by the second inverting means and the composite synchronous signal outputted by the synchronous separating means are input signals and are set to a low state when the two signals are simultaneously high; A NAND gate for outputting a three gate signal; When the third gate signal output by the NAND gate rises from a low state to a high state, the third gate signal is inverted from a high state to a low state, and the low state is kept low until a section to be measured in a predetermined section having an image signal. Delay means for delaying the signal to start the trigger pulse; And a trigger generating means having control means for controlling the first to third delay means to delay the signal to each predetermined section when each gate signal rises from the low state to the high state. Analyze and adjust. The method of claim 3, wherein the control unit performs down counting according to the input data value when the write signal falls from the high state to the low state under the condition that the reference clock is input. And a trigger generating means for selectively instructing the first delay means, the second delay means, and the third delay means to delay the signal. 3. A signal according to claim 2, wherein said execution command control means has a signal in a difference value between a reference level stored in said video signal reference level storage means and a digital signal level of a video signal to be measured by said analog-digital conversion means. When the tolerance of the level is A, set B smaller than A to set the adjustment interval once, and if it is not within the tolerance range, adjust the signal level of the video signal once, so that the difference value of the signal level is the tolerance A. Apparatus for analyzing and adjusting a video signal, characterized in that the execution command control means for terminating the overall execution process when entering.