JPS6043975A - Circular wipe signal generating circuit - Google Patents

Abstract

PURPOSE:To form a circular wipe signal by a simple constitution by providing a concentric circle data memory, a position comparing circuit, a driving circuit and a wipe signal outputting circuit. CONSTITUTION:A titled circuit is provided with a concentric circle data memory 1 for storing a position data of a concentric circle group corresponding to a border of a circular wipe, a position comparing circuit 6 for comparing a position data read out successively from the memory 1, with an input position signal SIN, a driving circuit 4 which executes a driving operation when the contents of the input position signal has crossed the concentric circle basing on the compared output, and a wipe signal outputting circuit 13 for forming a wipe signal basing on this driven output. In this state, the driving circuit 4 is controlled by comparing a stored data of the memory 1 with the input position signal SIN, by which when many concentric circles whose radius is different from each other cross a scanning line, the comparing operation can be executed in common without providing a comparing operating circuit with regard to each concentric circuit.

Description

[Detailed Description of the Invention] Industrial Application Field] The present invention relates to a circular wipe signal generating circuit, and is particularly suitable for use in adding special effects to television signals. Point] When creating a circular wipe effect with a soft edge, in order to gradually change the level of the key signal in the circular Bose part, the radius R that changes in conjunction with the fader lever as shown in Figure 1 is used. With respect to the Bose center line,
#Create a number of concentric circles with a diameter of R + r N, and divide each concentric circle by +W out of the video signal of the famous scanning line iN,
By changing the level of the key signal when the signal portion corresponding to T arrives, the brightness or color of the pose can be gradually linked, thus making it possible to create a soft Bose. .

Here, the concentric circles are 1 concentric circle in Figure 2 (as shown in the figure, the radius is rl + r2...
・N concentric circles are set that expand sequentially up to rH, and inside the reference circle with radius R, the radius sequentially increases to r1+r2...r
Concentric circles are formed that are contracted to N. Thus, the area where the radius changes from 'R0rN to R-rN\1: is the Bose width of the radius R.

As shown in the output level 1 column in Fig. 2, the output level of the key signal is O when J+< is 11, whereas the output level is O when the radius is outward. 11r
2...r (If you zoom in with 4'*, the 1F1 level will be crossed in successive steps, and the radius will be "l,"
-' r 5. ...-rN': When the reduction is made by P, the output level is set to K in step K accordingly.

2K...up to NK"・1.1 go big.

When the radius becomes larger than 1(, -1-rN), the output level maintains a level corresponding to -128, and when the digit 1b' of bidet No. 16 is smaller than the radius or RrH, the output level becomes i(+' , -1-127.Thus, the key signal is held at a level corresponding to -1-127.Thus, as shown in Fig. 3, the output level when the radius is normal is O, and the key signal i whose IJ11 level changes across this is O. (For example, as shown in FIG. 4(A), a concentric circle J) 1. If any scanning line Lm that intersects with the radius hq
If we can eliminate the need to scan sequentially across the concentric circles from the outside of the thick circle, the key signal KY will be as shown in Figure 4 (B
), when the scanning point is outside the group of concentric circles, the level of the key signal is maintained at a level corresponding to the value of 2128, while the scanning line is sequentially moved to the inner concentric circle by 4'. AF) The key signal increases the level sequentially with the value K as a step, and thus the border part B1)1
form.

On the other hand, if the running line I7m intersects the innermost circle and then successively crosses concentric circles whose radius increases toward the outside, the key signal KY will gradually decrease in level by taking the value K as a step. A border portion BD2 will be formed. In this way, in the border portions BDI and BD2, the level changes sequentially, so that the Bose exhibits a soft edge.

By the way, in order to determine the output level of the key signal by comparing each concentric circle with the position of the video signal as shown in Fig. 2, a comparator is used for each concentric circle.
It is conceivable to use a configuration in which it is determined in parallel whether or not the video body array intersects each concentric circle, and the output level of the key signal is determined based on the determination result. If this is done, it is inevitable that the configuration will become quite large and complicated.

In order to solve h·U during this time, it is conceivable to serially process the comparison of the video signal and the concentric circles in time order using one comparator. However, although this allows for a simpler and more compact configuration, there is a problem in that the processing time increases significantly. In reality, the time required to process Bose 1131)1 or BD2 is, for example, 70 (ns).
If the processing time is longer than 140 (n53), processing time of at least 140 (n53) will be required. There is a problem that requires interpolation in the circuit.

[Objective of the Invention 1] The present invention has been made in consideration of the above points, and it is possible to simplify the calculations described in FIG.
It is intended to be a circular wipe that can be executed by configuration.

[Summary of the invention]

In order to achieve such an object, the present invention includes a concentric circle data memory that stores position data of a group of concentric circles corresponding to the Baume of a circular wipe, and a position that compares position data sequentially read from the concentric circle data memory with an input position signal. A comparison circuit, a step circuit that performs a step operation when the content of the signal entered above based on the comparison output of this position comparison circuit intersects the concentric circle corresponding to the concentric circle data, and and a wipe signal output circuit for forming a wipe signal based on the stepping force, so that each time the human force position Jiq signal intersects each concentric circle, the step circuit causes the cheater in the concentric circle data memory to be sequentially output.

〔Example〕

]: Let us measure the speed of one example of the present invention) ji+i regarding the direction. In FIG. 5, reference numeral 1 denotes a concentric circle data memory, in which, for example, the data of concentric circles shown in the column 1 concentric circle in FIG. The address of the concentric data memory 1 is accessed by the output S1 of the step circuit 4 formed by the amplifier down counter M4. r 61 1 (A) shows 1- Lock pulse CL and J 2 are the enable function END 1, and only one up/down command terminal is provided on the condition that the number is not given. The mode 'C specified by the U/'D down mode command signal S2K
It is designed to count up or count down.

The data extracted in the concentric data memory 1 is latched in the register 5, and the latch output is (
S'f ic. The threshold level is given to the 1-comparison circuit 6 as 14-1''14.This level is given to the 1-comparison circuit 1ll'8-6 as the IWI period G
Based on J-No. 1-1 and ■data °ci+ru21\ζ
l's 1 person chi 1/', jii: ・By Equation 9 shown in the column of IS No. 4, the person Kai formed by the position data on the scanning line that is a-Bow S
IN arrives, and when this human position signal SIN is greater than the threshold level TH, a down count output S3 is sent out, or when it is smaller than the threshold level TH, an up count output S4 is sent out. These down count and amplifier count output signals S3 and S4 are applied to the nice enable 1Xii child ENB of the stepping circuit 4 through the selection circuit 7 which is switched in response to the up count down count mode command signal S2, and further through the NOR gate 8.

In this embodiment, 1 item @ limit ratio "I+) times i: 81" is provided, and when the up-count/down-count mode command signal 82 commands up-count or down-count, the upper limit value is further increased via the CPU bus 2. , the upper limit value or Shimoda value threshold data is given via the lower limit input circuit 12, and the count output S from the stepping circuit 4
1 is given as a comparison input, and when the count output S1 of the step circuit 40 matches the upper limit value or the lower limit value, inhibit ψu1 of the step circuit 4: gives an operation locking signal to the child I-TB,
Thus, step forward 1! □21 By preventing the count from continuing when the 21 path 4 crosses the upper limit or the lower limit, it is possible to stop the count by one stroke.

・1.Tatatana 7; 4B, count output S1 of time 1 烙4 is given to wipe signal output time 1"l'l 1', 4, and the second
A wipe output signal S5 having an output level as shown in "output signal" 1/) 45 (l) in the figure is sent out.

1 so on θi'7. In the configuration, C is input through the input circuit 15.
I) Concentric circle data ID defining Bose 11-1□1 from rJ Babas is given to register 5 as first Jt11 activation condition e4, and the threshold signal TH corresponding to this is position ratio fl) 66. Now, in FIG. 4(A), a scanning line L crosses the circular wipe and intersects the concentric circles as shown in FIG. 4(A). Scan position data on 1 or Ishi decoy comparison 1 [! 11g for 1st route 6th
When the next time comes, the up-count/down-count mode command signal S2 changes to a logic level of 9 tsubo at the time t when the scanning point passes the center line position of the concentric circle group, as shown in FIG. 4(C). Thus, the amplifier count mode command signal S2 is set to logic r.
O-1's 11:,), H>bow 11 times 11ii'j 4
At the same time as the amplifier count is commanded, the IA port selects the amplifier count output S4 and the gate circuit 8 is output to 11.
14, it is then applied to the disable terminal as an enable signal. Therefore, when the mode command signal S2 is at the logic "0" level and the level of the input position signal 81N becomes lower than the threshold level Tl1K latched in the register 5, the up-count output S4 is sent from the position comparator circuit 6. The step circuit 4 performs an up-count operation and outputs a count output S1 whose level is increased by one step.
occurs. This output S1 is given to the concentric circle data memory 1 as address 46, and concentric circle data whose radius is 7c is output to the register 5, which is one step smaller than the concentric circle data that has been sent out so far. Therefore, since the level of the input position 1d comparison circuit 6 becomes higher than the threshold level, the input position: jf near signal S1 is no longer sent out.

If scanning continues in this state, the human power level will be 11. lj
The level of the signal "IN" gradually decreases and eventually falls below the threshold level. At this time, as in the case described above, the position comparison circuit 6 sends out the count output S4, which is further gated through the selection circuit 7. The enable signal 1. is applied to the step circuit 8 through the step circuit 8. Therefore, the step circuit 4 again performs the amplifier counting operation and increases the level of the count output S1 by 1 step.At this time, the concentric circle data The memory 1 reads new data and applies it to the register 5. By repeating the same operation, the Mii circuit 4 sequentially increases the content of the output signal S1 one step at a time.

As a result, the contents of the human power position 1 self-signal SIN eventually reach the concentric circle group σ door P center I\"11i" at time t1 as shown in Fig. 4 (A), and the up-count/down-count mode command No. 411 When 82 (gl≧4 (C) in Figure 4) rises to logic "1" from the logic decoy, the step circuit 4 is designated to down-count mode, and the selection circuit 7 selects and sends out the down-count output S3. The contents of the input position signals S and N are the scanning line L1n when the status is 1.
As it crosses the concentric circle group outwards, the value becomes larger and larger.7,[Therefore, the threshold level T, which is also given to the position comparator circuit 6 by the register 5,
Since the level of the input position signal 81N becomes higher than H, the position comparator circuit 6 sends out a down count output S3 at this time, which is applied to the step circuit 4 through the selection circuit 7 and the gate circuit 8 as an enable signal. Therefore, the address increment circuit 4 counts down by the clock CL and lowers the output signal S1 by one step. At this time, the concentric circle data memory 1 outputs new concentric circle data with a radius that is one step larger and supplies it to the register 5.

In this way, as the contents of the register 5 increase by one step, the position comparison circuit 6 calculates the input position += s.
The level of 1N becomes lower than the threshold level and the down count output S3 cannot be obtained. In this state, when 'J among the 16 input signals SIN becomes larger than the threshold level, the position comparator circuit again sends out the down count output S3, which is incremented through the selection circuit 7 and gate circuit 8. to circuit 4. At this time, the step circuit 4 counts down and further lowers the level of the output S1 by one step. At this time, the concentric circle data memory 1 further provides circle data to the register 5 for assimilating the contents having a larger radius by one step.

'') In the same way, when the step number 1 is 4, the position comparison circuit 6 is counted down every time the level of the input position signal ``IN'' is 8 <1'') from the threshold level. Execute 1 and change the contents of output signal S1 one step at a time. I will have to make him swallow it. And soon input 4ir
: ii nee ii ii→'0 When the contents of S I N go outside the large diameter concentric circle (1'l), it is no longer human power level f[;
1"The level of the signal S' S I N is given from register 5" is greater than the main threshold level TH.
Word 1Hji', inode down callan:・Output S3
<, it becomes a state where it is not sent.

As mentioned above, the amplifier count/downcount mode command 4t''+' Q S 2 is switched from up-count to down-count 1j, and the 1.11 work of each formation part at one point t1 is also +4- for Figure 6. , Bere is as follows.

In other words, as shown in FIG. 6(A), the step time Wi'+4 is made to perform an up operation or a down operation depending on the rising edge of the clock CI. It changes as shown in FIG. 6 (1").

At time t1, as shown in FIG. 6(C), the up-count/down-count mode command S'S2 rises from logic (1) to logic 1 and switches the mode from amplifier counting to down counting. Then, in the section before that, the input position signal is -8□N (Figure 6 (B))
When the contents of the cut are sequentially reached, the stepper circuit 4 counts the amplifier, and the output of the register 5 is accordingly the position comparison circuit 'g;'. (Fig. 56 (G)).

On the other hand, when the up-count ° down-count mode command signal S2 rises to the logic "1" level and instructs the down-count mode (Fig. 6 (C)), the input position signal S1 (Fig. 6 (B) )) is given from the register 5 at the threshold level T I (((G) in FIG. 6).
Since it becomes higher, a down count output S3 is sent from the position comparator circuit 6, and this causes the step N path 4 to rise') 7
tJH't+ Sakuwozu7) (2+'lJ6 Figure (F
> ).

Therefore, concentric data memory 1 lowers the content of data stored in register 5 by one step (61st memory 1).
((circle).

The content of the count output S1 of the stepwise circuit 4 is the limit ratio axis circuit. Try not to.

In this way, scanning line L14. Does the incoming signal arrive in response to the same scan from when it enters the circular wipe section to when it exits? Each time the value of ゛+S1N exceeds each day of the concentric circle group, vj increases by 1 step, and decreases by 1 step ljl
Finally, the count output S1 is obtained, and this is the line Ii.
In the slope output circuit 13, it is converted into a wipe signal -QS5 (having a rail as shown in S+ of the second section ())) and sent out. In this way, it is possible to obtain a wipe key signal having border sections B1)1 and B1)2 whose levels change sequentially.

In addition, the steady stop signal 510(d))6hi1('l')) given to the gate circuit I controller 68 is used to maintain the stability of the operation. .

[Effect between layers]

As described above, according to the present invention, by comparing the stored data of the concentric data memory 1 that stores the radius corresponding to the size of the circular wipe with the input position signal (1, N), for example, the step of the up-down counter configuration can be determined. By controlling the circuit 4, when a scanning line intersects many concentric circles with different radii, comparison calculations can be performed for all concentric circles without having to provide a comparison calculation circuit for each concentric circle.
; iθ circuit, and thus a circular wipe signal with a soft border can be obtained by a simple (1/) configuration.

[Brief explanation of drawings]

Fig. 1 is an abbreviated diagram showing the principle of circular wipe, Fig. 2 is a chart showing the output level of the key signal to be output according to the relationship between the concentric circles and the input position signal SIN, and Fig. 8A3 is a diagram showing the resulting key signal. 1, FIG. 4 is a route diagram showing the relationship between concentric circles and key body temperature, and FIG. 5 is a block diagram showing an embodiment of the circular wipe signal generating circuit according to the present invention. 8I! FIG. 6 is a signal waveform diagram showing signals of each part of FIG. 6 G1-E. ]...Concentric circle data memory, 2...CPU ノ(su, 4...step)) (-times y・11.5...register,
6...Position comparison circuit, 7...zu-ku several times [11 numbers] 1
...Limit comparison circuit, 13...Wipe output time 1
1:;"i'. 110...11 people 11':1! people 1) し J 浠 % 2 Figure 3

Claims (1)

[Claims] A concentric circle data memory that stores positional data of a group of concentric circles corresponding to the pose of a circular wipe, a position ↑d comparison circuit that compares the position data sequentially read out from this concentric circle data memory with an input position signal, and a position txt. Based on the comparison output of the comparison circuit, a step circuit performs a step-step operation when the content of the input position IH intersects the concentric circle corresponding to the concentric circle data, and a wipe signal is generated based on the step output of this step-step circuit. A circular wipe signal generating circuit comprising a wipe signal and an output circuit that form a wipe signal.