JPH08140060A - Sequential scanning signal processor - Google Patents

Abstract

PURPOSE: To prevent the lack of valid scanning lines in the case of converting sequential scanning signals to the interlaced scanning signals of two systems and processing them. CONSTITUTION: The sequential scanning signals are converted to the interlaced scanning signals of the two systems of main signals and auxiliary signals by a sequential interlaced converter 2 and blanking is performed respectively separately to the main signals and the auxiliary signals by a blanking circuit 3. Two kinds of blanking pulses BLK 1 and BLK 2 to be supplied to the blanking circuit 3 are prepared in a blanking pulse circuit 5. The phase of the blanking period of the blanking pulse BLK 1 becomes the phase delayed for 0.5H in every other field compared to the phase of the blanking period of the normal blanking pulse BLK and the phase of the blanking period of the blanking pulse BLK 2 becomes the phase advanced for 0.5H in every other field compared to the phase of the blanking period of the normal blanking pulse BLK.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a progressive scanning signal processing apparatus compatible with the next generation broadcasting system, especially EDTV2.

[0002]

2. Description of the Related Art In recent years, as a next-generation TV system, in addition to widening, progressive scanning signals have been adopted in some of the EDTV 2 in Japan and the ATV proposed system in the United States. By progressive scanning, high image quality in the vertical direction is achieved. Japanese EDT
In the case of V2 wide broadcast, when the signal source is a progressive scanning signal,
The so-called letterbox method is used to convert progressive scanning signals to interlaced scanning signals and transmit them, and superimpose vertical high-frequency components of luminance signals and high-frequency components of vertical moving images on upper and lower non-image parts,
Since the letterbox signal is displayed as it is on the current 4: 3 aspect ratio receiver, a wide image with an aspect ratio of 16: 9 can be obtained with the main signal in the center for compatibility. Further, in the existing wide interlaced receiver, a wide image can be obtained by vertically expanding the central main signal portion. However, in both cases, the vertical resolution is lower than the vertical resolution of the current broadcast image.

On the other hand, in a dedicated progressive scan wide image receiver, a progressive scan signal is restored from the signals of the upper and lower non-image parts of the letterbox signal which is the interlaced scan signal and the main signal to obtain a progressive scan wide image. In this case, an image having a higher vertical resolution than the image of the current broadcast can be obtained. Further, in recent years, in order to record, edit, save, etc., video software with component signals in order to achieve high image quality in addition to widening, componentization within broadcasting stations is progressing. In other words, it processes with the component signal of progressive scanning until sending out,
At the sending location, it is converted into an interlaced scanning letterbox signal and sent. However, most devices such as current cameras, VTRs, switchers, and transmission devices are compatible with interlaced scanning, and it is difficult to process progressive scanning signals. In order to solve this problem, a luminance signal and a sequential scanning signal of two color difference signals are divided into a main signal and an auxiliary signal for each line, and the luminance signal is extended to the time of the interlaced scanning system and synchronized to obtain two systems of luminance signals. And the color difference signals are sequentially interlaced and converted into interlaced scanning signals.

As described above, the progressive scanning signal processing for solving the above-mentioned problems is performed by converting the interlaced scanning signal of the component and performing each processing in the broadcasting station, and by converting back to the progressive scanning signal before converting into the letterbox signal. A device has been proposed (eg, Television Society Technical Report BCS93).
-2 (January 1993), P7-P12, Consideration of component system in EDTV station, Akihiro Hori et al.). A conventional example of the above-described progressive scanning signal processing device will be described below.

FIG. 8 is a block diagram showing an example of a conventional progressive scan signal processing apparatus. In FIG. 8, reference numeral 1 denotes a progressive scanning image pickup device which outputs a progressive scanning signal. Reference numeral 2 denotes a sequential interlace conversion device that time-expands a sequential scanning signal output from the sequential scanning imaging device 1 and converts the sequential scanning signal into two systems of interlaced scanning signals of a main signal and an auxiliary signal.

Reference numerals 18 and 19 are first for processing the respective interlaced scanning signals outputted from the interlaced converter 2.
The interlaced scanning system processing circuit and the second interlaced scanning system processing circuit. This interlaced scanning system processing circuit 18, 1
As the device 9, there are various devices of a conventional interlaced scanning system, such as a video tape recorder and a switcher. Reference numeral 20 denotes an interlaced sequential conversion device that time-compresses the interlaced scanning signals of the two systems after processing by the first and second interlaced scanning system processing circuits 18 and 19 and returns them to the progressive scanning signals.

Reference numeral 4 is a progressive scan synchronizing signal generating circuit.
Reference numeral 22 is an interlaced scanning synchronization signal generation circuit. Reference numeral 21 is a progressive scan monitor. FIG. 9 is a block diagram showing an example of a specific configuration of the sequential interlace conversion device 2 in the progressive scanning signal processing device of FIG. A switching circuit 23 switches the input progressive scanning signal to two systems. Reference numerals 24 and 25 denote a main signal time extension circuit and an auxiliary signal time extension circuit that extend the time in the horizontal scanning period of the interlaced scanning system, and output the main signal and the auxiliary signal, respectively. Reference numeral 26 is a frequency dividing circuit for dividing the sync signal for the progressive scan signal (horizontal rate sync signal HD for the progressive scan signal) by 1/2.

FIG. 10 is a waveform diagram showing the states of the scanning lines at the points (a) to (f) of the sequential interlace converter 2 of FIG. 9 and the blanking pulse BLK. The blanking pulse BLK is shown by two lines, a solid line and a broken line, for the following reason. That is, if the sequential interlace conversion device 2 converts a sequential signal into two interlaced interlaced scanning signals, a delay of one horizontal scanning time of the sequential scanning (in the case of this conventional example) is made. , The blanking pulse BLK itself is delayed and displayed (solid line → broken line). As a result, the relationship between the scanning line and the blanking pulse BLK becomes like the relationship between the scanning line and the blanking pulse BLK in FIG.
The relationship with the waveforms (a) to (f) shows what position the phase of the blanking pulse BLK is at with respect to the signal of each part.

FIG. 11 is a block diagram showing an example of a concrete configuration of the interlaced sequential conversion device 20 in the progressive scanning signal processing device of FIG. 8, and 27 and 28 are two systems in which the main signal and the auxiliary signal are time-compressed respectively. 2 is a main signal time compression circuit and an auxiliary signal time compression circuit for converting into signals of the progressive scanning system. Reference numeral 29 is a switching circuit for switching and outputting two systems of sequential scanning signals. Reference numeral 30 is a frequency dividing circuit for dividing the sync signal for the progressive scan signal (horizontal rate sync signal HD for the progressive scan signal) by 1/2. Reference numeral 31 is a sync signal processing circuit that performs processing with a sync signal for blanking scanning (blanking signal BLK).

FIG. 12 is a waveform diagram showing the states of the scanning lines at the points (a) to (g) of the interlaced sequential conversion device 20 of FIG. 11 and the horizontal rate synchronization signal HD for the sequential scanning signal. The operation of the conventional progressive scan signal processing apparatus shown in FIG. 8 will be described below with reference to FIGS. 9 to 12.

Sequential scanning signals are output from the progressive scanning image pickup device 1 and are sequentially input to the interlace conversion device 2. In the sequential interlace converter 2, the switching circuit 23 of FIG.
The sequential scanning signal shown in (a) is switched for each scanning line as shown in (b) and (c) of the figure, and is divided into a main signal and an auxiliary signal. In the figure, the part x indicates that there is no signal. After that, the respective signals are respectively processed by the main signal time expansion circuit 24 and the auxiliary signal time expansion circuit 25 shown in FIG.
As shown in (d) and (e), it is converted into two systems of synchronized interlaced scanning signals. Further, the frequency dividing circuit 26 of FIG.
Generates a switching signal for the switching circuit 23 by dividing the horizontal rate synchronization signal HD for progressive scanning signal shown in FIG.

2 output from the interlace converter 2
The interlaced scanning signals of the system are subjected to exactly the same processing in the first interlaced scanning system processing circuit 18 and the second interlaced scanning system processing circuit 19, respectively. Here, each device of the conventional interlaced scanning system can be used. The two systems of interlaced scanning signals that have been subjected to the interlaced scanning system processing are input to the interlaced sequential conversion device 20. In the interlaced sequential conversion device 20, in the main signal time compression circuit 27 and the auxiliary signal time compression circuit 28 of FIG. 11, the two systems of interlaced scanning signals shown in FIGS. 12A and 12B are respectively shown in FIG.
It is time-compressed at the timing shown in (d) and is output as two-system sequential scanning signals. In the figure, x indicates that there is no signal output. After that, the switching circuit 29 of FIG.
As shown in (e), it is converted into one system of progressive scanning signals. Further, in the sync signal processing circuit 31 of FIG. 11, a sync signal processing such as blanking processing and sync addition is performed by the sync signal for progressive scanning (blanking signal BLK) and output. In FIG. 12 (f), the sync pulse and the like are not shown. Further, (g) of the figure shows a vertical blanking signal. Further, the frequency dividing circuit 29 of FIG. 11 halves the horizontal rate synchronizing signal HD for the progressive scanning signal in the same manner as the frequency dividing circuit 26 of FIG.
The frequency is divided and the switching signal of the switching circuit 29 is generated.

The signal converted into the progressive scanning signal by the interlaced progressive conversion device 20 is output to the progressive scanning monitor 21, and the progressive scanning signal subjected to various processes is displayed.

[0014]

However, in the progressive scanning signal processing apparatus as described above, the luminance signal of progressive scanning is divided into a main signal and an auxiliary signal for each line, and is expanded during the time of the interlaced scanning system. Since the signals are converted into two synchronized signals and the interlace scanning system blanking processing is performed,
There is a problem that a part of the effective scanning line of the progressive scanning signal is lost.

The above problem is solved by referring to FIGS. 13 and 14 (a).
This will be described with reference to (f). FIG. 13 shows a blanking (vertical blanking) signal BLK of the interlaced scanning system. Although not shown, the two systems of interlaced scanning signals converted by the sequential interlaced conversion device 2 of FIG. 8 by the blanking signal BLK are subjected to blanking processing. That is, since 525 scanning lines (in the case of NTSC) are divided into two fields, the end of the effective scanning line of the first (front) field (second field) and the effective scanning of the second (rear) field (first field) At the beginning of the line, half of one horizontal scanning period is cut by the blanking pulse.

FIG. 14 is an explanatory diagram showing the states of the scanning lines in each processing of the conventional example of FIG. 8A and 8F are shown in FIG.
Corresponds to the signal scanning line at each point (a), (f). In addition, FIGS. 7B to 7E show other processing points ((b) and (c)).
After time expansion of the main signal and the auxiliary signal, (d), (e)
Shows the scan lines of the signal after time compression of the main signal and the auxiliary signal. In FIG. 14, the vertical blanking period of progressive scanning is 40H, and the vertical blanking period of interlaced scanning is 2H.
It is set to 0H. However, H is 1 in each scanning system
It corresponds to the horizontal scanning period. It should be noted that each number in the drawing indicates a scanning line number of a sequential scanning signal. The inclination of each scanning line indicates the time of the horizontal scanning period.

The progressive scan signal in FIG. 14A is, for example, CC.
When an output signal of an image pickup device such as D (charge coupled device) is used, interference such as transfer pulse is mixed during the blanking period. Therefore, when converting this signal into a signal of two interlaced scanning systems and performing the processing, blanking processing of the interlaced scanning system is performed as shown in FIGS. Switcher, V
It is necessary to input to a device such as TR. In the figure, the blanked scanning lines are indicated by dotted lines.

As can be seen from FIGS. 2B and 2C, 525 lines and 41 lines of effective scanning lines are half-cut,
In addition, 40 lines and 1 line in the blanking period are left without being blanked. When this signal is interlaced and sequentially converted as shown in (d) and (e) of the same figure and further combined into a sequential scanning signal, it becomes as shown in (f) of the same figure. That is, when it is displayed on a progressive scanning monitor or the like, a partial signal remains in the blanking period, and an image in which the effective scanning lines are half missing at the top and bottom of the screen is displayed.

The signal in the blanking period is originally subjected to blanking processing on the input progressive scanning signal (in this case, there is a problem of lack of effective scanning lines in the interlaced scanning signal in the middle), or at the time of the synthesized progressive scanning signal. If the blanking process is performed, there is no problem, but the problem of lack of effective scanning lines is not solved and the image quality deteriorates. This is for broadcast applications,
It becomes a very big problem.

In view of the above point, the present invention can convert two simultaneous main signal and auxiliary signal interlaced scanning signals without losing the information of all effective scanning lines of the progressive scanning signal. It is an object of the present invention to provide a possible progressive scanning signal processing device. Further, in a progressive scanning signal processing apparatus capable of achieving the above object, in order to further obtain an interlaced scanning signal, consider increasing sensitivity or increasing S / N ratio.
When the interlaced scan signals of the systems are added to generate the interlaced scan signal of one system, the signal level does not decrease at the top and bottom (start and end) of the effective scan line, and the blanking process becomes appropriate. It is an object of the present invention to provide a progressive scanning signal processing device capable of performing the same.

[0021]

In order to achieve this object, a progressive scanning signal processing apparatus according to claim 1 separates each scanning line of the progressive scanning signal into a main signal and an auxiliary signal for each scanning line. In addition, a horizontal interlace conversion device that extends the horizontal scanning time to the time of the interlaced scanning system and converts it into two interlaced scanning signals, and a blanking process separately for two interlaced scanning signals output from the interlaced conversion device. A blanking processing circuit for performing the blanking processing circuit and a blanking pulse generation circuit for outputting two types of blanking pulses to the blanking processing circuit are provided. It is characterized in that the phase is changed every other field with respect to the phase of the regular blanking period.

The progressive scan signal processing apparatus according to claim 2 is
For each scanning line of the sequential scanning signal, in the first field, the odd-numbered scanning lines become the main signal side, while the even-numbered scanning lines become the auxiliary signal side, and in the second field, the even-numbered scanning lines become the main signal side. The main signal and the auxiliary signal are separated so that the scanning lines on the signal side and the odd-numbered scanning lines are on the auxiliary signal side, and the horizontal scanning period is extended to the time of the interlaced scanning system, and the interlaced scanning signals of the two systems of the main and auxiliary systems. Sequential interlace converting device, a blanking processing circuit for separately performing blanking processing on two main and auxiliary interlaced scanning signals output from the sequential interlacing conversion device, and a main and auxiliary A blanking pulse generation circuit for supplying two types of blanking pulses is provided. Then, the phase of the main blanking pulse output from the blanking pulse generating circuit in the blanking period immediately before the first field is set to be the same as the phase of the normal blanking period in the interlaced scanning, and the phase immediately before the second field is set. The phase of the blanking period is set to a phase that is 0.5 horizontal scanning period later than the phase of the blanking period of the regular blanking pulse for the interlaced scanning, and the first of the auxiliary blanking pulses output from the blanking pulse generation circuit. The phase of the blanking period immediately before the field is set to be the same as the phase of the normal blanking period of the interlaced scan, and the phase of the blanking period immediately before the second field of the blanking period of the normal blanking pulse of the interlaced scan is set. The phase is 0.5 horizontal scanning period earlier than the phase.

The progressive scanning signal processing apparatus according to claim 3 is
A sequential interlace conversion device that separates each scanning line of the sequential scanning signal into a main signal and an auxiliary signal for each scanning line, and extends the horizontal scanning time to the time of the interlaced scanning system and converts the interlaced scanning signal into two systems. A first blanking processing circuit for separately performing blanking processing on two systems of interlaced scanning signals output from a sequential interlace conversion device, and gains of two systems of interlaced scanning signals output from the first blanking processing circuit. A first and a second gain control circuit for separately controlling the pulse width, and a gate pulse generation circuit for generating a gate pulse for changing the gain ratio in each of the first and second gain control circuits for a predetermined one horizontal scanning period. , An adder that adds the output signals of the first and second gain control circuits into one system of interlaced scanning signals, and A blanking pulse generating circuit that outputs a blanking pulse to the first and second blanking processing circuits. The blanking pulse output is
To the blanking processing circuit of the second blanking processing circuit, the phase of the blanking period is output every two fields, and two types of blanking pulses having different phases from the phase of the regular blanking period are output, The processing circuit is characterized by outputting a blanking pulse having a regular phase.

A progressive scanning signal processing device according to a fourth aspect is
For each scanning line of the sequential scanning signal, in the first field, the odd-numbered scanning lines become the main signal side, while the even-numbered scanning lines become the auxiliary signal side, and in the second field, the even-numbered scanning lines become the main signal side. The main signal and the auxiliary signal are separated so that the scanning lines on the signal side and the odd-numbered scanning lines are on the auxiliary signal side, and the horizontal scanning period is extended to the time of the interlaced scanning system, and the interlaced scanning signals of the two systems of the main and auxiliary systems. Of the main interlace scanning signal, the first blanking processing circuit for separately performing the blanking processing on the interlaced scanning signals of the two main and auxiliary systems output from the interlaced conversion apparatus. The first gate pulse is generated in the last one horizontal scanning period of the effective scanning period of the first field, and the effective scanning period of the second field of the auxiliary interlaced scanning signal is changed. The gain ratio of the main interlace scanning signal output from the gate pulse generating circuit that generates the second gate pulse in the first one horizontal scanning period and the first blanking processing circuit in response to the first gate pulse A first gain control circuit for increasing the gain, a second gain control circuit for increasing the gain ratio of the auxiliary interlaced scanning signal output from the first blanking processing circuit in response to the second gate pulse, An adder that adds the output signals of the first and second gain control circuits into one system of interlaced scanning signals; a second blanking processing circuit that performs blanking processing on the output signals of the adder; and a first blanking processing circuit. The main and auxiliary first and second blanking pulses are supplied to the ranking processing circuit and the second blanking processing circuit is supplied with the third blanking pulse. And a blanking pulse generating circuit for supplying a ranking pulse. Then, the phase of the blanking period immediately before the first field of the main first blanking pulse output from the blanking pulse generation circuit is made the same as the phase of the regular blanking period of the interlaced scanning, and the second field is The phase of the blanking period immediately before is set to a phase that is 0.5 horizontal scanning period later than the phase of the blanking period of the regular blanking pulse for the interlaced scanning, and the auxiliary second signal output from the blanking pulse generation circuit is output. The phase of the blanking period immediately before the first field of the blanking pulse is made the same as the phase of the normal blanking period of the interlaced scan, and the phase of the blanking period immediately before the second field of the blanking pulse is normally blanked. The phase is 0.5 horizontal scanning period earlier than the phase of the pulse blanking period and The phase of the blanking period immediately before the first field and the second field of the third blanking pulse output from the king pulse generation circuit is made the same as the phase of the blanking period of the normal blanking pulse for interlaced scanning. There is.

[0025]

According to the first and second aspects of the invention, the sequential interlaced conversion device time-expands the sequential scanning signal and separates it into two systems of interlaced scanning signals of the main signal and the auxiliary signal. In addition, the blanking processing circuit performs blanking processing on the two systems of interlaced scanning signals by the two types of main and auxiliary blanking pulses output from the blanking pulse generation circuit.

According to the third and fourth aspects,
The signals of the two systems converted into the two systems of the interlaced scanning signals and subjected to the blanking processing by the first blanking processing circuit,
In accordance with the pulse output from the gate pulse generation circuit, the two systems of signals whose gain ratios are changed by the first and second gain control circuits only for the first and last horizontal periods of the effective horizontal scanning period are added by the adder. By doing so, the interlaced scanning signal of one system is converted. Further, the second blanking processing circuit subjects the signal to blanking processing with a blanking pulse having a phase of a regular blanking period of interlaced scanning.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] First, a progressive scanning signal processing apparatus according to a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a block diagram showing the arrangement of a progressive scanning signal processing apparatus according to the first embodiment of the present invention. In FIG. 1, reference numeral 1 is a progressive scanning image pickup device as a progressive scanning signal source. Reference numeral 2 converts the output signal of the sequential scanning image pickup device 1 into two systems of interlaced scanning signals of a main signal and an auxiliary signal, that is, each scanning line of the sequential scanning signal is a first scanning line for each scanning line.
In the field, the odd-numbered scan lines are the main signal side, the even-numbered scan lines are the auxiliary signal side, and the even-numbered scan lines are the main signal side and the odd-numbered scan lines are the auxiliary signal side in the second field. It is a sequential interlace conversion device that separates the main signal and the auxiliary signal as described above, extends the horizontal scanning period to the time of the interlaced scanning system, and converts it into two interlaced scanning signals of the main and auxiliary systems.

Reference numeral 3 denotes a blanking processing circuit for performing separate blanking processing on the two systems of interlaced scanning signals of the main signal and the auxiliary signal. Reference numeral 4 denotes a progressive scan synchronization signal generation circuit. Reference numeral 5 is a blanking pulse generation circuit for supplying two types of blanking pulse, a main blanking pulse and an auxiliary blanking pulse, to the blanking processing circuit 3. The phase of the main blanking pulse output from the blanking pulse generation circuit 5 in the blanking period immediately before the first field is made the same as the phase of the regular blanking period of the interlaced scanning, and the blanking pulse immediately before the second field is made. The phase of the ranking period is set to 0.5 H (1 H indicates one horizontal scanning period) later than the phase of the blanking period of the regular blanking pulse for the interlaced scanning, and the auxiliary output from the blanking pulse generation circuit 5 is performed. The phase of the blanking period immediately before the first field of the blanking pulse of is set to be the same as the phase of the regular blanking period of the interlaced scanning, and the second
0.5H (1H indicates one horizontal scanning period) with respect to the phase of the blanking period of the regular blanking pulse for the interlaced scanning, which skips the phase of the blanking period immediately before the field.
The phase is early.

This embodiment deals with component signal processing, and the main signal and auxiliary signal are luminance signals, and the color difference signals are omitted. Further, the blanking pulse indicates a vertical blanking pulse, and hereinafter, all blanking pulses indicate a vertical blanking pulse. 2A, 2B, and 2C show blanking periods of two types of blanking pulses BLK1 and BLK2 generated by the blanking pulse generation circuit 5 of FIG. 1 and a regular blanking pulse BLK for interlaced scanning. It is a signal waveform diagram which shows the relationship of a phase.

3A to 3F are scanning line waveform diagrams showing scanning lines in the blanking period and the effective period by the progressive scanning signal processing device in this embodiment. 1A, 1B, and 1C are points (a), (b), and
The scanning line waveform diagram in (c) is shown, (d), (e) shows the scanning line waveform diagram of the signal of two systems which were interlaced and converted sequentially by the process similar to a prior art example, (f). ) Shows a scanning line waveform diagram of a progressive scanning signal which is synthesized and inputted to a progressive scanning monitor or the like.

As in the conventional example, each number in the figure indicates the scanning line number of the input sequential scanning signal, and the inclination of each scanning line indicates the horizontal scanning time. The dotted line portion shows the blanked scanning line. The operation of the progressive scan signal processing apparatus according to the first embodiment of the present invention configured as shown in FIG. 1 will be described below with reference to FIGS.

The progressive scanning signal generated by the progressive scanning image pickup device 1 has a blanking period of 1 to 40 lines as shown in FIG. 3A by the synchronizing signal output from the synchronizing signal generating circuit 4 for progressive scanning. , Valid from 41 lines to 5
Output is made up to 25 lines (provided that the blanking period is set to 40H (line)). Here, in this embodiment, since the system is a system for converting and processing into two systems of interlaced scanning signals, blanking processing is not performed at this point.

This progressive scanning signal is time-expanded by the sequential interlacing converter 2 as in the conventional example, and is converted into two systems of interlaced scanning signals of a main signal and an auxiliary signal. The two systems of interlaced scanning signals of the main signal and the auxiliary signal are input to the blanking processing circuit 3 in the next stage. Here, the main and auxiliary 2 output from the blanking pulse generation circuit 5
Depending on the type of blanking pulse BLK1, BLK2,
Blanking processing is performed separately for each.

Here, two types of blanking pulses BLK1, B output from the blanking pulse generating circuit 5
LK2 is as shown in FIGS. 2 (b) and 2 (c). That is, the blanking pulse BLK in FIG.
1 is a pulse whose phase in the blanking period is 0.5H behind every other field with respect to the regular blanking pulse BLK of the interlaced scanning shown in FIG. On the contrary, BLK2 is a pulse whose phase in the blanking period is 0.5H earlier every other field.

These blanking pulses BLK1, B
By using LK2, the interlaced scanning signal shown in FIG. 3B is subjected to blanking processing by the blanking processing circuit 3 by the blanking pulse BLK1 so that the 525th effective scanning line is not removed, and The 40th line is blanked neatly. Also, FIG.
The interlaced scanning signal shown in (c) is subjected to blanking processing by the blanking processing circuit 3 by the blanking pulse BLK2 so that the 41st line of the effective scanning line is not scraped and the 1st line is blanked cleanly. It is ranked.

The main signal and the auxiliary signal thus blanked are subjected to various processes of the interlaced scanning system as in the conventional example, and then, as shown in FIGS. 3 (d) and 3 (e), respectively. It is compressed and converted into two systems of progressive scanning signals. Further, as shown in (f) of the same figure, the scanning lines are combined so that the scanning line numbers are matched with each other and are sequentially displayed on a scanning monitor or the like. As can be seen from FIG. 6F, no effective scanning line is missing, and there is no scanning line that is not blanked during the blanking period.

As described above, according to the first embodiment, the sequential scanning signals are simultaneously transmitted without losing the information of all the effective scanning lines of the sequential scanning signal, that is, without losing the effective scanning lines. It is possible to provide a progressive scanning signal processing device capable of converting the interlaced scanning signals of two systems into a processed signal and processing them. In this embodiment, the relationship between the effective scanning period of the progressive scanning signal and the blanking period is 1H units as shown in FIG. 3A, but the effective scanning period and the blanking period start and It goes without saying that the same processing can be performed even when the end is 0.5H.

[Second Embodiment] Next, the second embodiment of the present invention will be described.
The progressive scanning signal processing apparatus according to the embodiment will be described with reference to FIGS. FIG. 4 is a block diagram showing the structure of a progressive scanning signal processing apparatus according to the second embodiment of the present invention. In FIG. 4, reference numeral 1 is a progressive scanning image pickup device as a progressive scanning signal source.

Reference numeral 2 converts the output signal of the sequential scanning image pickup device 1 into two systems of interlaced scanning signals of a main signal and an auxiliary signal, that is, each scanning line of the sequential scanning signal is a first scanning line for each scanning line.
In the field, the odd-numbered scan lines are the main signal side, the even-numbered scan lines are the auxiliary signal side, and the even-numbered scan lines are the main signal side and the odd-numbered scan lines are the auxiliary signal side in the second field. It is a sequential interlace conversion device that separates the main signal and the auxiliary signal as described above, extends the horizontal scanning period to the time of the interlaced scanning system, and converts it into two interlaced scanning signals of the main and auxiliary systems.

Reference numeral 3 is a first blanking processing circuit for performing separate blanking processing on the two systems of interlaced scanning signals of the main signal and the auxiliary signal. Reference numeral 4 denotes a progressive scan synchronization signal generation circuit. Reference numeral 8 denotes an adder that adds the interlaced scanning signals of the main system and the auxiliary system whose gain is controlled to one interlaced scanning signal.

Reference numeral 9 is a second blanking processing circuit for performing blanking processing on the output signal of the adder 8. Reference numeral 10 is a gate pulse generation circuit for supplying a gate pulse to the first and second gain control circuits 6 and 7. The gate pulse generation circuit 10 generates a first gate pulse in the last one horizontal scanning period of the effective scanning period of the first field of the main interlaced scanning signal, and also an effective scanning of the second field of the auxiliary interlaced scanning signal. A second gate pulse is generated in the first horizontal scanning period of the period.

Reference numeral 6 is a first gain control circuit for increasing the gain ratio of the main interlace scanning signal output from the first blanking processing circuit 3 in response to the first gate pulse and increasing the signal amplitude. is there. A second gain control circuit 7 increases the gain ratio of the auxiliary interlaced scanning signal output from the first blanking processing circuit 3 in response to the second gate pulse to increase the signal amplitude.

Reference numeral 5 denotes the first blanking processing circuit 3 which is different from the normal blanking pulse BLK for interlaced scanning in the phase of the blanking period of the main (first) and auxiliary (second).
The blanking pulses BLK1 and BLK2 are supplied to the second blanking processing circuit 9 and the third blanking pulse BLK3 having the same phase as the blanking period of the normal blanking pulse for the interlaced scanning is supplied to the second blanking processing circuit 9. This is a ranking pulse generation circuit. That is, in the blanking pulse generation circuit 5, the phase of the blanking period immediately before the first field of the main first blanking pulse is set to be the same as the phase of the regular blanking period of the interlaced scanning, and the second field is generated. The phase of the blanking period immediately before is set to a phase that is 0.5 horizontal scanning period later than the phase of the blanking period of the regular blanking pulse for interlaced scanning, and immediately before the first field of the auxiliary second blanking pulse. The phase of the blanking period of is the same as the phase of the normal blanking period of the interlaced scanning, and the phase of the blanking period immediately before the second field is the phase of the blanking period of the normal blanking pulse of the interlaced scanning. 0.5 horizontal scanning period early phase,
First field and second of the third blanking pulse
The phase of the blanking period immediately before the field is set to be the same as the phase of the blanking period of the normal blanking pulse for interlaced scanning.

The difference between the second embodiment and the first embodiment is that the first and second gain control circuits 6, 7,
The point is that an adder 8, a second blanking processing circuit 9, and a gate pulse generation circuit 10 are further provided, and one system of interlaced scanning signals obtained by adding them from the two systems of interlaced scanning signals is created and output. Also in this second embodiment,
Similar to the first embodiment, the component signal processing is handled, the main signal and the auxiliary signal are luminance signals, and the color difference signals are omitted. Further, the blanking pulse indicates a vertical blanking pulse, and hereinafter, all blanking pulses indicate a vertical blanking pulse.

Further, FIG. 5 shows points (a), (b),
The signal waveform diagrams of (d), (e), (f), and (g) are shown.
Further, (c) of the figure shows a signal obtained by adding the signal waveform diagrams (a) and (b) as they are, and BLK3 and GP1 and GP2 are interlaced scans output from the blanking pulse generation circuit 5 and the gate pulse generation circuit 10, respectively. Of the normal blanking pulse and gate pulse.

Further, FIGS. 6A and 6B are block diagrams showing an example of a specific configuration of the first gain control circuit 6 and the second gain control circuit 7. In FIG. 6, 11 and 13 are multipliers, and 12 and 14 are gate pulses GP1 and G for gain control, respectively.
P2 is a selector for switching between a normal gain value and a gain up value.

FIG. 7 is a block diagram showing an example of a specific structure of the gate pulse generating circuit 10. In FIG. 7, 15 is a counter for counting the number of scanning lines, and 16, 1
7 are arbitrary set values D1 (= 263) and D2 (=
282) and the output value of the counter 15 are compared with each other, and when they are equal, a gate pulse GP1 or GP2 is output.

The operation of the progressive scan signal processing apparatus according to the second embodiment of the present invention shown in FIG. 4 will be described below. Similarly to the first embodiment, the progressive scan signal output from the progressive scan imaging device 1 is converted by the sequential interlace conversion device 2 into two main and auxiliary interlaced scan signals. Further, two kinds of main (first) and auxiliary (second) blanking pulses BLK1 and BLK2 output from the blanking pulse generation circuit 5 are separately subjected to blanking processing in the first blanking processing circuit 3, The main and auxiliary signals are output without the lack of effective scan lines. The main signal and the auxiliary signal at this point are, for example, as shown in FIG.
It is output as shown in the signal waveform of (b).

Here, when the interlaced scanning signal is generated from the conventional sequential scanning signal, one of the interlaced scanning signals divided into two systems is not used, but the sensitivity or the S / N ratio is used.
In most cases, two systems of interlaced scanning signals are added and used to increase the ratio. 5 (a),
When the two signals in (b) are simply added, the signal level of the 40th line corresponding to the 41st line of the auxiliary signal in the main signal and the signal level of the 1st line to the 525th line of the main signal in the auxiliary signal are Since the respective blanking processes result in almost zero (blanking level), as shown in FIG.
It can be seen that the gain of the line line is about half that of the signals of the other scanning lines.

Therefore, in the present invention, the gate pulse generating circuit 10 controls the gain of the main signal.
The gain control circuit 6 and the second gain control circuit 7 for controlling the gain of the auxiliary signal are arranged so that the gains of the 525th line and the 41st line are approximately twice as large as the gains of the other scanning lines. A gate pulse for controlling the gain is generated (GP1 and GP2 in FIG. 5). As a result, FIG. 5 (d), (e)
As shown in FIG. 11, a signal in which the 525th line is higher in the main signal and the 41st line is higher in the auxiliary signal is obtained.

The gain-controlled main signal and auxiliary signal are added by the adder 8 to obtain the signal shown in FIG. 5 (f). That is, all the lines including the 525th line and the 40th line have a signal level about twice that of the main signal or the auxiliary signal. This is because a general image signal has a high correlation even in the vertical direction, and therefore the signal levels of adjacent scanning lines are almost the same. Since this addition signal is obtained by adding blanking processing separately to the main signal and the auxiliary signal so that the effective scanning line is not missing, the blanking period is an interlaced scanning normal blanking period (here, It is 19H, which is 1H less than 20H). Therefore, the blanking pulse BLK3 (see FIG. 5) having the same phase as the regular blanking pulse BLK for the interlaced scanning output from the blanking pulse generating circuit 10 in the second blanking processing circuit 9 has the 525th line and the 40th line. Regular blanking processing of interlaced scanning for blanking the eyes by 0.5H is performed, and an addition interlaced scanning signal is output.

As described above, according to the second embodiment of the present invention, in the progressive scanning signal processing device for converting the progressive scanning signals into the interlaced scanning signals of the two systems and processing the interlaced scanning signals of the two systems, the interlaced scanning signals of the two systems are added to form one system. When generating the interlaced scanning signal of, the level of the signal does not become lower than the other portions without lacking the effective scanning line of the original sequential scanning signal and at the beginning and end scanning lines in the effective scanning line. You can

The specific configuration of the first and second gain control circuits 6 and 7 is, for example, as shown in FIGS. 6 (a) and 6 (b).
As shown in. That is, the normal gain N
And the gain value U1 at the time of gain increase, the gate pulse GP1
The selector 12 switches the gain of the main signal with the multiplier 11, and the normal gain N and the gain value U2 at gain increase are switched with the selector 14 by the gate pulse GP2. Are controlling. In addition, "2 → 1MUX" in the selector means a multiplexer that selects and switches one signal from two signals. As a matter of course, as the coefficients U1 and U2 at the time of increasing the gain, it is possible to select an appropriate set value that does not hinder the image. In addition, the multipliers 11 and 13
The part of may have a simple structure with a selector and an adder.

The specific configuration of the gate pulse generating circuit 10 is as shown in FIG. 7, for example. That is, 5
The counter 15 that counts 25H counts the number of scanning lines, and the comparators 16 and 17 set the value D1 (= 26
3) and D2 (= 282), the gate pulse GP is applied at a predetermined position (262H and 282H).
1 and GP2 are output respectively. The set values D1 and D
Needless to say, the number 2 is not limited to 263 or 282, and may be appropriately changed according to the method of the blanking process applied by the first blanking process circuit 3 so as not to lack the effective scanning line.

[0056]

According to the progressive scan signal processing device of the present invention, the sequential scan signal is converted into two main and auxiliary interlaced scan signals which are synchronized without a lack of effective scan lines. It becomes possible to process. Claim 3,
According to the progressive scanning signal processing device of Item 4, when the synchronized interlaced scanning signals of two systems are added to obtain one interlaced scanning signal, the effective scanning line of the original progressive scanning signal is lacked. The blanking process can be appropriately performed without doing so, and the signal level can be appropriately controlled so that the signal level does not become small at the scanning lines at the beginning and the end of the effective scanning line, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a progressive scanning signal processing apparatus according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a blanking pulse output by a blanking pulse generation circuit of the progressive scanning signal processing apparatus according to the first embodiment.

FIG. 3 is a scanning line waveform diagram showing scanning lines in a blanking period and an effective period of the progressive scanning signal processing apparatus according to the first embodiment.

FIG. 4 is a block diagram showing a configuration of a progressive scanning signal processing device according to a second embodiment of the present invention.

FIG. 5 is a diagram showing the parts (a), (b) of the second embodiment of FIG.
It is a signal waveform diagram in (d), (e), (f), (g).

FIG. 6 is a block diagram showing an example of a specific configuration of first and second gain control circuits used in the second embodiment of the present invention.

FIG. 7 is a block diagram showing an example of a specific configuration of a gate pulse generation circuit used in the second embodiment.

FIG. 8 is a block diagram showing a configuration of a sequential scanning signal processing device in a conventional example.

FIG. 9 is a block diagram showing an example of a specific configuration of a sequential interlace conversion device used in the conventional example.

FIG. 10 is an operation explanatory view of the sequential interlace conversion device used in the conventional example.

FIG. 11 is a block diagram showing an example of a specific configuration of an interlaced sequential conversion device used in the conventional example.

FIG. 12 is an operation explanatory diagram of the interlaced sequential conversion device used in the conventional example.

FIG. 13 is a blanking (vertical blanking) signal waveform diagram of an interlaced scanning system.

FIG. 14 is an explanatory diagram showing a state of scanning lines in each processing of the conventional example of FIG.

[Explanation of symbols]

 1 Sequential Scanning Imaging Device 2 Sequential Interlace Conversion Device 3 Blanking Processing Circuit (First) 4 Sequential Scanning Synchronization Signal Generation Circuit 5 Blanking Pulse Generation Circuit 6 Gain Control Circuit (First) 7 Gain Control Circuit (Second) 8 Adder 9 Blanking processing circuit (second) 10 Gate pulse generation circuit 11, 13 Multiplier 12, 14 Selector 15 Counter 16, 17 Comparator

Claims (4)

[Claims] 1. A progressive scanning signal processing system for converting a progressive scanning signal into an interlaced scanning signal for processing, wherein each scanning line of the progressive scanning signal is separated into a main signal and an auxiliary signal for each scanning line, and is horizontal. A sequential interlace conversion device that extends the scanning time to the time of the interlaced scanning system and converts it into two systems of interlaced scanning signals, and a blanking process for separately performing the two systems of interlaced scanning signals output from the sequential interlaced conversion device. A blanking processing circuit and a blanking pulse generation circuit that outputs two types of blanking pulses to the blanking processing circuit are provided, and a blanking period of two types of blanking pulses output from the blanking pulse generation circuit Phase 1
A progressive scanning signal processing device characterized in that the phase of a regular blanking period is changed for each field separately. 2. A progressive scanning signal processing device for converting a progressive scanning signal into an interlaced scanning signal for processing, wherein each scanning line of the sequential scanning signal is mainly an odd numbered scanning line in the first field. On the signal side, the even-numbered scanning lines become the auxiliary signal side, and in the second field, the even-numbered scanning lines become the main signal side and the odd-numbered scanning lines become the auxiliary signal side. A sequential interlace conversion device that separates and extends the horizontal scanning period to the time of the interlaced scanning system to convert into two systems of interlaced scanning signals of main and auxiliary, and two systems of main and auxiliary output from the interlaced conversion device And a blanking processing circuit for separately performing blanking processing on the interlaced scanning signals of the above, and two kinds of main and auxiliary blanking pulses are supplied to the blanking processing circuit. A blanking pulse generating circuit, and the phase of the blanking period immediately before the first field of the main blanking pulse output from the blanking pulse generating circuit is the same as the phase of the regular blanking period of the interlaced scanning. In addition, the phase of the blanking period immediately before the second field is set to 0. with respect to the phase of the blanking period of the normal blanking pulse of the interlaced scanning.
The phase of the blanking period immediately before the first field of the auxiliary blanking pulse output from the blanking pulse generation circuit is the same as the phase of the regular blanking period of the interlaced scanning. The progressive scanning signal is characterized in that the phase of the blanking period immediately before the second field is 0.5 horizontal scanning period earlier than the phase of the blanking period of the normal blanking pulse of the interlaced scanning. Processing equipment. 3. A progressive scanning signal processing system for converting a progressive scanning signal into an interlaced scanning signal for processing, wherein each scanning line of the sequential scanning signal is separated into a main signal and an auxiliary signal for each scanning line, and is horizontal. A sequential interlace conversion device that extends the scanning time to the time of the interlaced scanning system and converts it into two systems of interlaced scanning signals; and a blanking process for the two systems of interlaced scanning signals output from the sequential interlaced conversion device separately. A first blanking processing circuit; first and second gain control circuits that separately control the gains of the two systems of interlaced scanning signals output from the first blanking processing circuit; and the first and second gain control circuits. Of the gate pulse generation circuit for generating a gate pulse so as to change the gain ratio for each predetermined horizontal scanning period. An adder that adds the output signals of the first and second gain control circuits into one system of interlaced scanning signals; and a second blanking processing circuit that performs a blanking process on the output signals of the adder. And a blanking pulse generation circuit that outputs a blanking pulse to the first and second blanking processing circuits, and a blanking pulse output from the blanking pulse generation circuit is supplied to the first blanking circuit. To the processing circuit, two kinds of blanking pulses having a phase of the blanking period and a phase different from that of the regular blanking period are output every other field, and the second blanking processing circuit is output. In contrast, the progressive scanning signal processing device is characterized in that a blanking pulse having a regular phase is output. 4. A progressive scanning signal processing device for converting a progressive scanning signal into an interlaced scanning signal for processing, wherein each scanning line of the sequential scanning signal is mainly an odd numbered scanning line in the first field. On the signal side, the even-numbered scanning lines become the auxiliary signal side, and in the second field, the even-numbered scanning lines become the main signal side and the odd-numbered scanning lines become the auxiliary signal side. A sequential interlace conversion device that separates and extends the horizontal scanning period to the time of the interlaced scanning system to convert into two systems of interlaced scanning signals of main and auxiliary, and two systems of main and auxiliary output from the interlaced conversion device Blanking processing circuit for separately performing blanking processing on the interlaced scanning signals of the first interlaced scanning signal, and the last one horizontal scanning period of the effective scanning period of the first field of the main interlaced scanning signal. A gate pulse generating circuit for generating a first gate pulse between them and a second gate pulse during the first one horizontal scanning period of the effective scanning period of the second field of the auxiliary interlaced scanning signal; A first gain control circuit that increases a gain ratio of the main interlaced scanning signal output from the first blanking processing circuit in response to a gate pulse; and the first gain control circuit that responds to the second gate pulse. A second gain control circuit for increasing the gain ratio of the auxiliary interlaced scanning signal output from the first blanking processing circuit, and the output signals of the first and second gain control circuits are added to interlace one system. An adder for converting the scan signal; a second blanking processing circuit for performing a blanking process on the output signal of the adder; And a blanking pulse generation circuit for supplying a third blanking pulse to the second blanking processing circuit and a main and auxiliary first and second blanking pulse respectively. The phase of the blanking period immediately before the first field of the main first blanking pulse output from the blanking pulse generation circuit is made the same as the phase of the regular blanking period of interlaced scanning, and the second The phase of the blanking period immediately before the field is 0.5 horizontal scanning period later than the phase of the blanking period of the normal blanking pulse in the interlaced scanning, and the auxiliary signal output from the blanking pulse generating circuit is output. The phase of the blanking period immediately before the first field of the second blanking pulse of The phase of the blanking period just before the second field is set to be 0.5 horizontal to the phase of the blanking period of the normal blanking pulse of the interlaced scanning. The phase of the blanking period immediately before the first field and the second field of the third blanking pulse output from the blanking pulse generating circuit is set to a phase early in the scanning period, and the normal blanking pulse of the interlaced scanning is obtained. The progressive scanning signal processing device, which has the same phase as the blanking period.