JPH0636577B2 - Television digital video effect device - Google Patents

Description

The present invention relates to a television digital video effect device (hereinafter referred to as a DVE device), and more particularly to a shadow on the back of a screen reduced by DVE. Can D
Regarding a VE device.

[Prior Art] Generally, in a television, a screen displaying one image may be overlaid with another image smaller than the screen. In such a case, as shown in FIG. 5, the first image data 1 displayed on the entire television screen and the television digital video effect device 3 (hereinafter referred to as DVE).
That is, the second image data 2 whose size has been reduced by () is combined by the combiner 4. At this time, by adding a shadow (shadow portion) corresponding to the frame of the second image to the back of the superimposed second image, it is possible to give the effect that the second image is raised.

Therefore, a shadow key generator is provided in the DVE 3 described above, and the shadow key is input from the shadow key generator 3 to the synthesizer 4 described above to synthesize an image in which a shadow (shadow portion) is drawn on the back. ing.

[Problems to be Solved by the Invention] In the above-described conventional DVE device, an image that becomes a back shadow is displayed in FIG. 4 (1) without paying particular attention to the density of the shadow of the superimposed images. ),
Since it is not visible at all, there is a problem that the area of the image that becomes the back shadow is reduced.

For this reason, it is desired to perform an image synthesizing process in which the superimposed images can be seen in a raised manner without reducing the display area of the image that becomes the back shadow.

[Means for Solving the Problems] In the present invention, means for solving the above-mentioned problems is to write digitally processed television image data in a preset position of one frame memory according to a reduction ratio. In a television digital video effect device (DVE) for reading out the television image data written in the memory, a reading means for advancing and reading out the key data written in advance is set for a preset time. The fixed delay means for returning the key data to the original state again, the variable delay means for changing the delay amount, the two tri-state registers for temporally synthesizing the both data, and the two types of pre-calculated data Of two latches for holding and the means for synthesizing the outputs of both of them at timings that differ in time, and two more latches for synthesizing them. A shadow key generator comprising a tri-state register, a multiplier for multiplying the synthesized data by the synthesized key data, and a D / A converter for converting the output to analog data again is provided. That is.

[Embodiment] Next, an embodiment of a television digital video effect apparatus according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a DVE device of this embodiment. In FIG. 1, 10 is an A / D converter for converting input analog image data into digital image data, and 11 is a frame for storing this digital image data. Memory, 1
2 is a key generator, 13 is write address setting means for designating a write address of the frame memory 11, 14 is read address setting means for designating a read address of the frame memory, and 15 is a shadow to be synthesized by the synthesizer described above. A shadow key generator for generating a shadow key and reduced image data, and a D / A converter 16 for converting the image data from the shadow key generator 15 into an analog image signal.

Here, the key generator is assumed to generate an A key for designating the position and size of the composite image and a shadow key pulse for designating the position and size of the pulse shadow portion, as shown in FIG. Further, the read address setting means operates as a read means for advancing and reading the key data written in advance by advancing for a preset time.

Further, the shadow key generator temporally synthesizes the fixed delay means 21 for returning the advanced key data to the original state as shown in FIG. 2, the variable delay means 22 for changing the delay amount, and the data of both. Two tri-state registers 2
3, 24, and two latches 26, 27 for holding two types of data pre-calculated by the CPU, and a means for synthesizing the outputs of both latches 26, 27 at timings different in time, and for synthesizing these. Further, it comprises two sets of tri-state registers 28 and 29, a multiplier 25 for multiplying the combined data by the combined key data, and a D / A converter 30 for converting the output to analog data again. To be done. The A key pulse described above is input to the tri-state register 23, and the shadow key pulse is inverted by the tri-state registers 24 and 28 and the inverter 30 and input to the tri-state register 29.

Next, the operation of this embodiment will be described.

The image and the key signal written in the frame memory are read by advancing time by the read address, and the advanced key data (image data is omitted) is fixed by the delay means 2.
It is input to 1, and is delayed by the amount advanced by the read address. The variable delay means 22 is advanced and controlled by an external control. The respective output A key signals and B key signals are temporally combined by the tri-state register 23 and the tri-state register 24. The combination is performed by the A key pulse and the B key pulse as shown in the timing chart of FIG. The combined key signal is input to the multiplier 25. A coefficient for changing the value of the A key signal held by the latches 26 and 27 is input from the CPU data bus to the other input side of the multiplier 25. The respective held data are temporally controlled by the shadow key pulse as in the above-mentioned A key signal and B key signal, and are given to the multiplier. The digital key signal output from the multiplier 25 in this manner is D / A converted by the D / A converter 30 and output as the analog shadow key signal shown in FIG.

This shadow key signal is input to the synthesizer shown in Fig. 5 together with the reduced image data to be superimposed, and when it is superimposed on the image data that becomes the shadow, the shadow also appears in the shadow area as shown in Fig. 4 (2). It is possible to obtain an image in which the image

[Effects of the Invention] As described above, according to the present invention, a key data signal written in a frame memory is advanced by a reading means, and a fixed delay line and a variable delay line are used to generate a shadow key signal. It is possible to generate a "plow shadow key" (transparency) by changing the level of the signal at the shadow with time by using a multiplier, and the display area of the image that becomes the shadow. The effect is that the superposed images can be raised without reducing more than necessary.

[Brief description of drawings]

FIG. 1 is a block diagram showing a television digital video effect apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram showing a shadow key generator, and FIG. 3 is timing in the shadow key generator according to the present embodiment. Figure, Figure 4
(1) is a conventional image, (2) is a diagram showing an image of this embodiment, and FIG. 5 is a system diagram in which a DVE and a synthesizer are combined. 10: A / D converter 11: Frame memory, 12: Key generator 13: Read address generator (reading means) 15: Shadow key generator 16: D / A converter 21: Fixed delay means, 22: Variable delay means 23 , 24, 28, 29: Tri-state register 25: Multiplier, 26, 27: Latch 30: D / A converter

Claims (1)

[Claims] 1. A television digital video effect in which digitally processed television image data is written in a preset position of one frame memory in accordance with a reduction ratio, and the television image data written in the memory is read out. In the device (DVE), a reading means for reading the key data written once by advancing for a preset time,
Fixed delay means for returning the advanced key data to the original state again, variable delay means for changing the delay amount, two tri-state registers for temporally synthesizing both data, and one of two types of pre-calculated Two latches for holding data, a means for synthesizing the outputs of both latches at timings different from each other, two further tristate registers for synthesizing them, and the synthesized data are synthesized as described above. A television digital video effect device having a shadow key generator including a multiplier for multiplying the key data and a D / A converter for converting the output to analog data again.