JPS5810911B2 - Projection film used to check broadcast facts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a projection film used for confirming broadcast facts.

Confirmation of broadcasting fact is a method for checking (monitoring) on the receiving side whether or not a particular broadcast content, such as a commercial broadcast, was actually broadcast at a predetermined time. By discriminating the broadcast content and automatically recording the encoded data corresponding to the broadcast content, and analyzing the recorded data after the fact, it is possible to determine whether or not the above-mentioned broadcast is true, and whether there are any flaws in the broadcast. etc., but if you are trying to do it automatically instead of manually, information to identify the specific broadcast content you are trying to check above can be distinguished from other broadcast content. (digital signal) must be transmitted to the receiving side during the actual broadcast of the broadcast content to be confirmed.

Traditionally, the confirmation of broadcast facts in television broadcasts uses digital electrical signals for identification.
White and black vertical stripes are applied to one frame of the projection film that records the specific broadcast content to be confirmed, and the combination of black and white stripes is used as a code to distinguish it from the signal received by the television receiver. There is a known system in which code information representing the content of the broadcast can be extracted by doing so.

By the way, it is extremely difficult to directly apply the black and white vertical stripes to the projection film, so they can be created by, for example, drawing them on a large piece of blank paper and then photographing and recording them on the projection film. Due to positional deviations, when a black and white pattern drawn accurately on a blank sheet of paper is transferred to a projection film, it may deviate from the specified recording position, or the image pickup position or magnification of the film feeding device that reads out the pattern may be misaligned. When the image is deformed due to fluctuations and is caught on the receiving side, the black and white vertical stripes may be shifted from the specified position in the raster or deformed to a greater extent than the normal length and width.

For this reason, the conventional method of obtaining information for confirming the broadcast fact by simply detecting only black and white vertical stripes is no matter how accurate the detection device on the receiving side is. Because the vertical stripes) have changed as described above, there is an extremely high risk that the desired code signal may not be detected reliably or that it will be detected incorrectly.

SUMMARY OF THE INVENTION Accordingly, the present invention aims to provide a projection film for use in confirming broadcasting facts, which allows accurate confirmation of broadcasting facts on the receiving side.

The invention will be explained in more detail below with reference to illustrated embodiments.

As shown in FIG. 1, the projection film CF of the present invention has a video information recording track 1 in the center along the running direction (indicated by an arrow) as well as an audio information recording track 2 on one side thereof, as is well known. On the other side, a band-shaped transparent portion 4 in which perforations 3 are formed at equal intervals is provided.

Then, in this projection film CF, the broadcasting fact should be confirmed in the frames 52 to 5n after the first frame 51 among the frames 51 to 5n divided in the video information recording track 1. Specific video information, for example "A" ~
The alphabet letter "Z" is optically recorded, and a special pattern signal is also optically recorded therein using the first piece 51, which is characterized by automatic confirmation of the broadcast fact of the specific video information. ing.

As shown in detail in Figure 2, the signal recorded on this first frame 51 was recorded within the safe zone SZ, where imaging transmission and reception can be completed even under any adverse conditions on both the transmitting and receiving sides. It consists of multiple clock patterns x for searching and an address (ROW
ADDRES) and a code pattern z that specifies a code.

The feature of the present invention is that a Krolev pattern x for searching is created here, and it has a function as a sampling signal for extracting the address and code patterns y and z that will be scanned and transmitted afterwards. The subsequent pattern y is how the image is captured and transmitted on the transmitting side and detected on the receiving side.

This has a significant influence on the detection of z, and the clock pattern x used for its search is designed to particularly ensure its imaging and detection on the receiving side compared to the later patterns y and z.

In other words, the clock pattern x for searching starts from a certain length TB at the scanning speed from the left end of the piece 51, and has a certain width TA, and also covers the piece 51 (i.e., one field).
A certain length B from the upper end of.

It is constructed by recording the vertically elongated black bands 6 of the above required length B1 at regular intervals TB by Na (16 in this embodiment).

The interval TB between the black bands 6 is transparent or white.

In addition, the address pattern y is arranged so that the horizontal direction starts right below each of the Nr (four in this example) black belts on the left side of the Na black belts 6, and is separated by a certain length W1 from the black belts 6. Square sections of TA with the same width as the black belt 6 and B2 of constant length are arranged in a predetermined row (in this example, 7
(column), and by changing the combination of black pattern or white pattern (or remaining transparent) for Nr (4) sections in each column, each column is It is coded B, C, and D.

Incidentally, in this embodiment, the top row is 7 and the bottom row is 1.

Furthermore, the code pattern z is the same as the address pattern y above.
Directly below the required black belt of 6 or less, there is a block in the same horizontal position and the same number of rows as the row of the address pattern y, and the width of one section is the above TA, but the vertical width is Imagine a rectangular section that is longer by a predetermined length α below B2, and determine which row of sections in that section should be the black pattern and which column should be the white pattern (transparent). , which is determined in relation to the above-mentioned specific video information to be confirmed recorded in the frames 52 to 5n of the projection film CF, and represents the code of the specific video information to be confirmed as a whole. There is.

The search clock pattern x, address pattern y, and code pattern x have the relationship described above, and in order to record them in one frame of projection film, for example, write only the parts that should be black on a large blank sheet of paper. All you have to do is color the blank paper black and take a photograph of the blank paper.

The three types of patterns x, y, and z recorded in one frame (one field) in this way are captured and transmitted under the same conditions both in the case of image capture and transmission on the transmitting side and in the case of reception on the receiving side. Since it is transmitted and received, it is clear that the rate of change will be the same.

Then, as shown in FIG. 3, the electric signal generated by the first horizontal scan of the frame 51 is a clock pulse having a width of TA and an interval of TB from a point Ts time away from the horizontal synchronizing signal 7 for one horizontal scanning period HKN2. There are several waveforms, which are at least B.

It is clear that the period will continue.

The projection film CF of the present invention is constructed as described above, but by attaching it to a conventionally known television receiver, only the search clock pattern , and on the premise of this detection, detect address pattern y and code pattern z, thereby obtaining code information for confirmation representing the code of specific video information sent after them. 4th for automatic fact checking device
, 5 will be described in detail.

FIG. 4 generally shows a clock pattern detection circuit X that detects the search clock pattern x to obtain clock pulses, and FIG. An address pattern detection circuit Y for detecting the code pattern z and a code pattern detection circuit Z for detecting the code pattern z based on the clock pulse and distributing the detection signal according to the signal from the detection circuit Y are shown.

First, to explain from the clock pattern detection circuit X shown in FIG. 10, the video signal is separated into a vertical synchronization signal and a horizontal synchronization signal, and the video signal is input to a black and white level determination circuit 11 including a level clamp circuit, and the horizontal synchronization signal is input to a counter 12. .

After being clamped, the video signal input to the black and white level determination circuit 11 is converted into a binary electrical signal (
The black level is HIGH and the white level is LOW).

Here, the black level is "H" and the white level is "L".
Therefore, for convenience of explanation, the H portion (black level) will be referred to as a mark and the L portion (white level) will be referred to as a space.

The binary electric signal from the judgment circuit 11 is sent to the mark counter 13.
M and a space counter 13s, the mark length and space length are each counted, and after becoming a parallel binary electric signal according to the length, a little redundancy is given to the above-mentioned fixed time TA and Ts. Only those having a length within a specified range are taken out, and a small amount of space existing in the mark section and a small amount of mark existing in the space section are absorbed and removed here.

Marks that have become parallel binary signals in the mark counter 13M are sorted into odd and even numbers by the odd/even ranking sorting circuit 14, and the odd numbers are stored in the latch memory 150 on the odd number side, or the even numbers are stored in the latch memory 150 on the even number side. The data are stored in the latch memory 15E, respectively.

Note that the odd/even rank selection circuit 14 specifically includes a register for temporarily holding data, a divider for dividing the data by a specific divisor (for example, 2), and a divider for determining the result. If there is a remainder after dividing the input data by the divisor, the input data is determined to be an odd number, and if there is no remainder, it is determined to be an even number. The rank selection circuit also has the same configuration.

The marks sorted in this way are compared by a comparator 16, and when an odd or even match is found, a pulse indicating a match is output from the comparator 16, and this operation is performed by a latch memory. 15o,
This process is repeated every time new information is entered in 15E and old information is cleared.

That is, here, it is checked whether the widths TA of the black bands 6, which are elements of the search clock pattern x, are the same between adjacent ones during one horizontal scan.

Furthermore, the marks converted into parallel binary signals by the mark counter 13M are also input to the gate 17, which is configured to pass only the first mark after receiving the horizontal synchronization signal. The mark that has passed through, that is, the first mark in each horizontal scan, is sorted by the odd and even rank sorting circuit 18 in the same manner as described above, and is stored in the latch memories 19o and 19E so that it can be compared by the comparator 20. It has become.

That is, here, whether the mark with a length within the specified range that first appeared in the previous horizontal scan and the mark with the length within the same specified range that first appeared in the horizontal scan of the mouth match each other. It is possible to check.

The match signal from the comparator 20 is sent to the hold circuit 2.
1, it is held for a certain period of time.

The counter 12 is set by the horizontal synchronizing signal separated by the separation circuit 10, and is set by the horizontal synchronization signal separated by the separation circuit 10.
It is reset by the mark (black level) that is output.

Therefore, the counter 12 counts, for each horizontal synchronization signal, the time from when it is received to when the first mark is received.

The above-mentioned time value counted by the counter 12 for each horizontal scan is sorted into odd number and even number by the odd and even rank sorting circuit 22, and is stored in the latch memories 23o and 23E.
The data are stored in the memory and compared by the comparator 24.

That is, here, it is checked whether the black pattern located on the leftmost side of one screen is continuous vertically at the same horizontal scanning position, or in other words, whether it is continuous at the Ts time position. be.

The match signal from the comparator 24 is sent to the hold circuit 2.
5, it is held for a certain period of time.

As mentioned above, the coincidence signal from the comparator 16, which is used to check whether the widths of adjacent marks in one horizontal scanning section match each other, is added to the counter 26. It is designed to count how many matching signals are changed during the interval.

Then, the counted value is sorted into odd and even numbers by the odd and even rank sorting circuit 27, stored in the latch memories 280 and 28E, and compared by the comparator 29.

That is, here, it is determined whether the number of marks present in the previous horizontal scan and the number of marks present in the current horizontal scan match each other. It can be used to check whether or not they are continuous.

The match signal from the comparator 29 is sent to the hold circuit 3.
0, it is held for a certain period of time.

the comparator 29, which can check whether the number of marks between horizontal scans matches as described above;
Match signals from a comparator 20 that can check whether the widths of the first marks match and a comparator 24 that can check whether the positions of the first marks match are sent to hold circuits 30, 21, and 25. The logical product is once held by the AND circuit 31 for each horizontal scan.

Furthermore, although omitted in the drawing, the width of the space (white level) from the space counter 13S is determined by a mechanism similar to the selection circuit 14, the latch memories 15o and 15E, and the comparator 16, and then the width of the space is determined by the gate. 17. With a mechanism similar to the sorting circuit 18, latch memories 19o, 19E, and comparator 20, the initial space width after the establishment of the first mark can be compared between horizontal scans, and the sorting circuit 22, latch memory 23o, 23E
, the continuation is checked by a mechanism similar to that of the comparator 24, and the number can be checked by a mechanism similar to that of the selection circuit 27, latch memories 28o, 28E, and comparator 29; It is added to the AND circuit 31, and logical product is performed together with the mark.

Thus, when all the conditions for marks and spaces between horizontal scans are satisfied, the AND circuit 3
1 outputs a pulse representing the coincidence, and the pulse is counted by a preset counter 32, and the number corresponds to the Bo that the black belt 6 has a satisfactory length. When the preset value is exceeded, the counter 32 outputs a pulse indicating that the preset value has been exceeded.

That is, here, the number of horizontal scans set by the above-mentioned conditions for marks and spaces (above B).

(equivalent to) can be used to check whether or not you are continuously satisfied.

When the above is satisfied and the preset counter 32 outputs a pulse, the memory control circuit 33 is driven by the pulse, and the latch memories 15o, 23o
Data necessary to be stored, such as marks, widths of spaces, permutations, numbers, times relative to horizontal synchronization signals, etc., are stored in the memory 34.

Therefore, the clock pattern detection circuit X shown in FIG.
This is a search clock pattern in which the black bands 6 have a specific arrangement and length as described above, and only detects images that are the same or very similar to it. Therefore, this detection circuit X stores data in the memory 34 only when the above-mentioned non-clock pattern x is received.

Next, the address pattern detection circuit Y (FIG. 5) that detects the address pattern y on the premise of detecting the clock pattern x as described above will be explained. 35
When the gate 35 is opened by a pulse from the preset counter 32, the signal passes through it.

Therefore, the binary electrical signal passes through the gate 35 after the clock pattern x is detected as described above.

W1 after clock pattern x as shown in FIG.
The range is white, and in order to detect it, the above gate 3
The binary electrical signal that has passed through 5 is input to the preset counter 36, which counts the length of the space (white level) for each horizontal scan. , the counter 36 outputs one pulse.

In other words, it can be said that the counter 36 detects only horizontal scanning lines whose entirety is at the white level.

Furthermore, the pulses from this counter 36 are counted by a preset counter 37, and the number of pulses is
When the number corresponds to pattern x) is read out.

This read data is converted into a binary electric signal by the decoder 39 (FIG. 4), and the mark width becomes a clock pulse having the TA1 space width Ts as shown in FIG.

These clock pulses are counted by the preset counter 40 shown in FIG. 5 by the number Nr (see FIG. 2) used as an address instruction, and when the clock pulses have been counted Nr, the gate 41 is closed by the output of the counter 40. Nr pieces of data pass through the gate 41 and are sequentially input to the mark comparator 42.

On the other hand, the binary electric signal that has passed through the gate 35 is inputted through the gate 43 to the mark comparator 42 which receives the clock pulse, thereby determining whether it is a mark (black) when each clock pulse arrives. space(
After that, the shift register 44 outputs Nr bits (the first black pattern is a sign bit) in parallel 2 bits in black and white bits for each horizontal scan.
Leading electric signal (for example, in the case of the top row in Fig. 2, 1
．． 1.1=7).

Then, the parallel binary electric signals for each horizontal scan from the shift register 44 are sorted by an odd/even rank sorting circuit 45 into those related to odd-numbered horizontal scans and those related to even-numbered horizontal scans, Latch memory 46o
, 46E, and are compared by a comparator 47.

The coincidence signal from the comparator 47 is counted by a preset counter 49, and when the number corresponds to the vertical width B2 (see FIG. 2) of the black pattern constituting the address pattern y, that is, B2 time When the same parallel binary electric signal continues, a pulse is changed by the counter 49, and the gate 50 is opened by the pulse, and the parallel 2 electric signal representing the address stored in the latch memory 46o is changed.
The forward electrical signal passes through the gate 50 and enters an address selector 51 included in the code pattern detection circuit 2 to designate the address of the code signal, which will be described later.

In this way, one column of address pattern y is detected, but between that column, W2 is detected as shown in FIG.
The length of the space (white) of the binary electric signal passed through the gate 35 to detect this is counted by the preset counter 52 for each horizontal scan, and the length of the space (white) is counted by the preset counter 52 for each horizontal scan. Similar to the preset counter 36, when almost the entire horizontal scanning section is occupied by space, a pulse is output from the counter 52, and the pulse is counted by the preset counter 53, and the number corresponds to the length of W2. When the number is reached, counter 5
The third pulse passes through the gate 54 and opens the gate 43, making it possible to detect the address pattern y of the next column.

The pulse from the preset counter 49 is input to the gate control circuit 55, so that the gate 54 opens after the regular address pattern y is detected, and closes otherwise.

Address pattern y is detected for each column as described above, and next, a code pattern detection circuit detects code pattern z under the control of the detected signal and the clock pulse. Z will be explained.

The pulse of the preset counter 49, which outputs a pulse every time the address pattern y of each column is detected, is as follows:
A gate 56 to which the binary electric signal passed through the gate 35 is applied is opened.

The above-mentioned binary electric signal C which has passed through this gate 56 (that is, after the detection of one column of address pattern y) is applied to a mark comparator 57 which receives clock pulses from the decoder 39, and thereby each clock pulse When it arrives, it is determined whether it is a mark (black) or a space (white), and then the shift register 58 converts it into a parallel binary electric signal in which black and white are used as bit units.

Then, the parallel binary electrical signals for each horizontal scan from the shift register 58 are sorted into odd and even numbers by an odd and even rank sorting circuit 59, and are stored in latch memories 60o and 60E, respectively. Comparator 61
can be compared by.

The coincidence signal from the comparator 61 is counted by the preset counter 62, and when the number corresponds to the α length which is the difference from the black pattern for address as shown in FIG. When the same parallel binary electric signal continues for α time, a pulse is obtained from the counter 62, and the gate 63 is opened by the pulse, and the parallel binary electric signal stored in the latch memory 60o passes through the gate 63 to the address selector. 51.

The pulse from the preset counter 62 is also applied to the gate control circuit 55 to close the gate 38.

The code pattern 2 of each column is detected as described above, but as described above, the address selector 51
Controlled by the detected address pattern y, each column order is stored in a dedicated latch memory 64.

The data stored in these latch memories 64 is read out at an appropriate time, recorded in code on an external recording medium such as a perforated tape or magnetic tape, and the recorded information is analyzed after the fact. By doing so, it is possible to confirm whether or not the specific video information recorded on the projection film CF was actually broadcast.

In the above embodiment, three types of patterns were recorded on one frame using almost the entire area, but they may be recorded on a part of the frame or on a plurality of frames.

Furthermore, when the number of codes to be checked is small, address pattern y is not necessarily required.

Further, although the binary code was performed using black and white as units, in the case of color broadcasting, the binarization may be performed using other colors.

As is clear from the above description, the projection film according to the present invention includes a retrieval clock pattern that is binarized by color difference such as black and white and can be detected as a clock signal;
A code pattern that is binarized by color difference such as black and white and specifies the code of the specific video information to be confirmed is recorded in the same frame with the latter pattern located directly below the former pattern. Therefore, it is possible to search for the code pattern based on the detection of the clock pattern, and since both patterns receive the same fluctuation rate, there are no false positives, and the broadcast fact can be accurately confirmed. be.

[Brief explanation of drawings]

FIG. 1 is a partially omitted plan view showing an embodiment of the projection film of the present invention, FIG. 2 is a plan view showing an enlarged view of one of the frames of the projection film, and FIG. The waveform diagram of the electric signal obtained by scanning the search tarok pattern recorded on the frame shown in the figure is shown. Figures 4 and 5 are block diagrams of the automatic broadcast fact confirmation device.
The figure shows the clock pattern detection circuit and the fifth
The figure shows an address pattern detection circuit and a code pattern detection circuit. CF...Projection film, x...Clock pattern for search, z...Code pattern.

Claims (1)

[Claims] 1. In projection film that records specific video information,
Within that arbitrary frame, there is a search clock pattern that is binarized with a color difference such as black and white and can be detected as a clock signal, and a code pattern that is binarized with a color difference such as black and white to identify the code of the specific video information. A projection film used to confirm the broadcast fact by recording the latter pattern directly below the former pattern.