JPH0998342A - Special effect digital device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the special effect digital device in which a memory capacity to store read addresses in response to the special effect is reduced. SOLUTION: A CPU 32 calculates a read address in response to the special effect designated by a parameter input section 31 and compresses it and stores the result to an address data memory 33. In parallel with processing of writing image data 11 to an image memory 13, the compressed read address is read from the address data memory 33 and expanded sequentially by an expander 36. Image data are read in real time from the image memory 13 by the expanded read address. Since the read address obtained in advance is compressed and stored, the capacity of the memory storing the read address is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital special effect device which gives a special visual effect by reading out image data written in a memory in a different order from that in writing, and particularly to an address for reading. The present invention relates to a digital special effect device capable of obtaining various special effects by calculating according to special effects.

[0002]

2. Description of the Related Art In a digital special effect device for giving a special effect to an image such as switching an image to turn a page, image data is temporarily written in a memory, and various effects can be obtained by operating the order of reading the image data. I'm supposed to get it. Since the read address needs to be generated at high speed in response to the reading of the image data, the conventional digital special effect device is provided with dedicated hardware for generating the read address. Therefore, dedicated hardware is added every time a new special effect needs to be obtained.

Japanese Unexamined Patent Publication No. 1-194770 discloses a digital special effect device in which address information calculated by a read address calculation unit is stored in a memory and an address for reading image data is read from the memory. Has been done. In this device, the arithmetic unit is instructed to calculate the read address according to the special effect, and the address resulting from the address calculation is stored in the address storage unit. When the image data stored in the image memory is read out, the address stored in the address storage unit is read out and the image data is read out using this address. This eliminates the need for high-speed address calculation.

[0004]

If the address corresponding to the special effect is calculated and stored in the memory in advance, it is not necessary to calculate the read address at high speed, and the hardware of the address generator can be simplified. Can be planned. However, one frame of image data is generally 7 in the horizontal direction.
It is composed of 68 lines and 483 lines in the vertical direction, and the number of pixels is very large. Further, the address information for reading the image data needs to be represented by a key representing the (X, Y, Z) three-dimensional coordinates and the distribution ratio of the image for each pixel, and the address information in the key and each coordinate axis direction is Normal,
Each is composed of 32 bits. Therefore, there is a problem that the storage capacity of the address storage unit for storing the read address becomes very large.

Therefore, an object of the present invention is to provide a digital special effect device capable of reducing the capacity of a memory for storing a read address according to a special effect.

[0006]

According to a first aspect of the present invention, an image data storage means for storing image data, a special effect designation means for designating a special effect to be applied to an image, and this special effect designation means. Read address calculation means for calculating a read address for reading image data from the image data storage means in the order in which the special effect specified by the above is obtained, and compression means for compressing the read address obtained by the read address calculation means. Compressed read address storage means for storing the read address compressed by the compression means, image data writing means for writing image data in the image data storage means in a predetermined address order, and image data written by the image data writing means. A compression address for reading the compressed read address from the compressed read address storage means in parallel with writing. Address read means, decompression means for sequentially decompressing the compressed read address read by the compressed address read means, and image data for sequentially reading image data from the image data storage means in accordance with the read address decompressed by the decompression means. The reading means and the digital special effect device are provided.

That is, according to the first aspect of the present invention, the read address obtained by the read address calculating means is compressed and stored. In parallel with the process of writing the image data in the image data storage means, the stored compressed read address is read out and sequentially expanded, and the image data is read out according to this read address. Since the read address obtained by calculation is compressed, the read address can be stored with a small memory capacity.

According to the second aspect of the invention, the image data storage means for storing the image data, the special effect designating means for designating the special effect to be applied to the image, and the special effect designated by the special effect designating means. In the order of obtaining, read address calculation means for calculating the read address for reading the image data from the image data storage means, compression means for compressing the read address obtained by the read address calculation means, and compression by this compression means. Compressed read address storing means for storing the read address, image data writing means for writing the image data in the image data storing means in a predetermined address order, and parallel writing of the image data by the image data writing means in advance. At a speed that can follow the write address in a predetermined order according to the specified special effect. A fixed read address generating means, a compressed address read means for reading the compressed read address from the compressed read address storage means in parallel with the writing of the image data by the image data writing means, and a read by the compressed address read means. Decompressing means for sequentially decompressing the compressed compressed read address, address selecting means for selecting one of the read address expanded by the decompressing means and the read address generated by the fixed read address generating means, and this address selection The digital special effect device is provided with image data reading means for sequentially reading image data from the image data storage means in accordance with the reading address selected by the means.

That is, according to the second aspect of the invention, with respect to the predetermined special effect, the fixed read address generating means is provided and the read address is generated at a speed capable of following the writing. The read address calculated by the read address calculation means is compressed and stored, and is read and expanded in parallel with the writing of the image data.
Then, either the read address generated by the fixed read address means or the read address expanded by the expansion means is selected to read the image data. As a result, for a special effect that needs to be calculated in real time, a read address is generated by the fixed read address generation means, and for a special effect that does not need to be calculated in real time, it is calculated by a relatively low-speed calculation means. It can be post-compressed and stored.

According to the third aspect of the present invention, the read address calculation means includes a central processing unit, and the central processing unit calculates the read address according to the type of special effect designated by the special effect designating means.

That is, according to the third aspect of the invention, the read address is calculated and calculated by the central processing unit.
This allows the central processing unit to generate read addresses corresponding to various types of special effects, and simplifies the configuration of the device.

In a fourth aspect of the invention, the compression means includes a central processing unit, and the read address according to the special effect is compressed by the central processing unit according to a predetermined algorithm.

According to the fifth aspect of the invention, the compression and decompression of the read address are performed by a reversible compression method that can restore the compressed read address to the same state as before the compression.

That is, according to the fifth aspect of the present invention, since the read address is compressed and expanded by the compression method that establishes reversibility, the information of the read address will not be lost due to the compression.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an outline of the configuration of a digital special effect device according to an embodiment of the present invention. In this device, the read address obtained by calculation is compressed and stored. The analog video signal 11 is input to the analog-digital converter 12, converted into digital data, and output. The image memory 13 is a memory that stores digitally converted image data for a plurality of frames. The image data read from the image memory 13 is converted into an analog signal 15 by the digital-analog converter 14 and output. The timing generation circuit 16 is a circuit that generates a system clock and various sync signals 17 such as a horizontal sync pulse and a vertical sync pulse from a video reference signal.

The synchronizing signal 17 is input to the analog-digital converter 12 and the digital-analog converter 14. The write address generation circuit 18 uses the image memory 13
Is a circuit for generating a write address 19 to The read address generation circuit 21 is a circuit that calculates and outputs a read address corresponding to a specific special effect at high speed. The digital special effect device includes, in addition to the read address generation circuit 21,
The general-purpose address generating circuit 22 is provided for generating read addresses corresponding to various special effects in a relatively long time. The switch 23 is a switch having a function of switching the read address supplied to the image memory 13 from the general-purpose address generating circuit 22 and the read address generating circuit 21 as needed.

The synchronization signal 17 output from the timing generation circuit 16 is input to each of the write address generation circuit 18, the read address generation circuit 21 and the general-purpose address generation circuit 22 so that the synchronization operation of the entire device is ensured. It has become. The general-purpose address generation circuit 22 includes a parameter input unit 31 for inputting parameters necessary for calculating an address corresponding to various special effects. Various parameters input from the parameter input unit 31 are input to the CPU (central processing unit) 32. CP
U32 calculates and obtains a read address corresponding to various special effects according to the input parameters. Also, the read address of the calculation result is compressed according to a predetermined algorithm.

The address data memory 33 is a memory for storing a compressed read address. The write control unit 34 is a circuit that generates various control signals necessary for writing the read address compressed by the CPU 32 into the address data memory 33. The read control unit 35
Is a circuit for generating various control signals necessary for reading the compressed read address stored in the address data memory 33. The decompressor 36 is a circuit portion that decompresses the compressed read address read from the address data memory 33 and restores it to the state before compression. The decompressor 36 outputs the decompressed data size, and the read control unit 35 compresses the decompressed data from the address data memory 33 so as to match the read rate from the timing generation circuit 16. The read address is read. The external interface 37 is an input / output circuit for inputting a read address generated by another device (not shown). The address input through the external interface 37 is compressed by the CPU 32,
It is stored in the address data memory.

The CPU 32 performs an operation according to the parameter input from the parameter input unit 31,
Read addresses corresponding to various special effects are calculated. C
The compression method used by the PU 32 is a so-called reversible compression method that can restore completely the same data as before compression when decompressed. For example, the read address data of all pixels is reduced to read addresses of only different portions between the previous frame and the next frame, and compression by inter-frame correlation is performed. In the case of a page turn that gives the effect of turning the page, only the image data at the edge of the page is the difference between the frames. Therefore, the data amount can be reduced by setting the read address only to this edge portion.

The speed at which the read address is calculated by the CPU 32 may be slower than the speed required to read the image data from the image memory 13 in real time. The decompressor 36 can decompress the read address at a speed necessary for reading the image data in real time.

When the image data is input, the image data is converted into digital data according to the synchronization signal 17 from the timing generation circuit 16. Further, the write address generation circuit 18 generates a write address according to the synchronization signal 17, and the digitally converted image data is converted into the image memory 1.
Written in 3. When it is necessary to calculate the read address in real time as in the case of sequentially switching the special effect, the read address from the read address generating circuit 21 is supplied to the image memory 13 by the switching unit 23. The read address generation circuit 21 can generate a read address at a speed capable of following the write speed, that is, at the same speed as or higher than the write speed. Image data is read according to the read address from the read address generating circuit 21, converted into an analog video signal by the digital-analog converter 14, and output.

On the other hand, when it is not necessary to calculate the read address in real time as in the case where the special effect to be added is determined in advance, the switch 23 is used as the general-purpose address circuit 22.
Then, the read address is generated by the general-purpose address circuit 22. The operator can select special effects,
Required parameters are input from the parameter input unit 31. The CPU 32 calculates a read address according to the specified special effect and compresses the calculation result. CPU32
The read address compressed by is written in the address data memory 33 according to a control signal from the write control unit 34.

When reading the image data stored in the image memory 13, the read control section 35 sequentially reads the compressed read addresses from the address data memory 33 in accordance with the synchronization signal 17 from the timing generation circuit 16. The decompressor 36 decompresses the read address data in real time and supplies it to the image memory 13. The image data is read at a required speed according to the read address, converted into an analog video signal by the digital-analog converter 14, and output.

Since the read address is compressed and stored in the address data memory 22 as described above, the read address can be stored with a small memory capacity. Further, since the compressed read address is expanded not by the CPU but by a dedicated expander, the read address can be restored at the speed required for reading the image data.
Furthermore, since the read address is calculated by the CPU, various read addresses corresponding to various special effects can be obtained. Further, since the read address is compressed by the CPU, the structure of the device can be simplified as compared with the case where a dedicated compressor is prepared.

In the embodiment described above, the read address is compressed by the CPU, but it may be compressed by a dedicated compressor. Further, if there is reversibility, the compression method of the read address may be arbitrary.

[0026]

As described above, according to the first aspect of the present invention, since the read address obtained by the read address calculating means is compressed and stored, the read address can be stored with a small memory capacity. Further, since the read address corresponding to the special effect designated by the special effect designating means is calculated by the read address computing means, various special effects can be dealt with.

According to the second aspect of the invention, the fixed read address generating means generates the read address for the special effect that requires the calculation to be performed in real time. For special effects that do not require real-time calculation, a read address is calculated by a relatively low-speed calculation means, which is then compressed and stored, and expanded at the time of reading. Since these can be selected and used, the read address can be appropriately supplied corresponding to various special effects.

Further, according to the third aspect of the present invention, since the read address corresponding to various kinds of special effects can be generated by the central processing unit, the structure of the device can be simplified.

According to the invention of claim 4, the compression is performed by the central processing unit. For example, if the same central processing unit is used to calculate the read address and compress it,
The configuration of the device can be further simplified.

Further, according to the fifth aspect of the present invention, since the read address is compressed and expanded by the compression method in which the reversibility is established, the information of the read address will not be lost due to the compression.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a configuration of a digital special effect device according to an embodiment of the present invention.

[Explanation of symbols]

 13 image memory 18 write address generation circuit 21 read address generation circuit 22 general-purpose address generation circuit 31 parameter input section 32 CPU 33 address data memory 34 write control section 35 read control section 36 expander

Claims (5)

[Claims] 1. An image data storage means for storing image data, a special effect designating means for designating a special effect to be applied to an image, and an order in which the special effect designated by the special effect designating means can be obtained. A read address calculating means for calculating a read address for reading the image data from the image data storing means, a compressing means for compressing the read address obtained by the read address calculating means, and a read address compressed by the compressing means are stored. Compression read address storing means, image data writing means for writing image data in the image data storing means in a predetermined address order, and compression read address storing means for writing image data in parallel with the image data writing means. A compressed address reading means for reading the compressed read address from the means; The decompressed address reading means includes a decompressing means for decompressing the read out addresses sequentially, and an image data reading means for sequentially reading out image data from the image data storage means in accordance with the decompressed read address decompressed by the decompressing means. A digital special effects device characterized by: 2. An image data storage means for storing image data, a special effect designating means for designating a special effect to be applied to an image, and an order in which the special effect designated by the special effect designating means is obtained. A read address calculating means for calculating a read address for reading the image data from the image data storing means, a compressing means for compressing the read address obtained by the read address calculating means, and a read address compressed by the compressing means are stored. Compression read address storing means, image data writing means for writing image data in the image data storing means in a predetermined address order, and a special special value which is predetermined in parallel with writing of image data by the image data writing means. Fixed to generate the read address in a predetermined order according to the effect at a speed that can follow the write Read address generation means, compressed address read means for reading the compressed read address from the compressed read address storage means in parallel with the writing of image data by the image data writing means, and read by the compressed address read means. Decompressing means for sequentially decompressing the compressed read address, address selecting means for selecting one of the read address expanded by the decompressing means and the read address generated by the fixed read address generating means, and the address selecting means Image data reading means for sequentially reading the image data from the image data storage means in accordance with the read address selected by the means. 3. The read address calculating means comprises a central processing unit, and the central processing unit calculates a read address according to the type of special effect designated by the special effect designating means. Alternatively, the digital special effect device according to claim 2. 4. The compression means comprises a central processing unit, and the read address according to the special effect is compressed by the central processing unit according to a predetermined algorithm.
Alternatively, the digital special effect device according to claim 2. 5. The compression and decompression of the read address includes:
3. The digital special effect device according to claim 1, wherein the compressed read address is restored by a reversible compression method capable of restoring the same state as before compression.