JP2969943B2 - Image conversion device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image conversion device, and is particularly suitable for application to a special effect device for giving a special effect to a television signal.

B. Summary of the Invention The present invention stores an input image consisting of a two-dimensional plane formed by an input video signal in a memory, divides the input image in the memory into a predetermined size, and affixes the input image to a three-dimensional curved surface. In an image conversion apparatus that performs a simple image conversion operation and reads image data from a memory based on a read address obtained as a result of the operation, when reading an input image area corresponding to the back surface of the three-dimensional curved surface from the memory, the three-dimensional curved surface By performing clipping processing to delete a part and not performing clipping processing when reading an input image area corresponding to the surface of the three-dimensional curved surface from the memory, an image representing a three-dimensional curved surface obtained as an output image can be obtained. The generation of an unsightly black line can be effectively avoided.

C Prior Art Conventionally, in this kind of special effect device, a television signal is subjected to a digital signal conversion process to obtain a 3D signal.
Japanese Patent Application Laid-Open No. Sho 61-230477 proposes an image which appears as if an input image is pasted on a three-dimensional curved surface (for example, a cylindrical curved surface) on a display.

In this type of image conversion method, an input image VDIN as shown in FIG. 5A is divided into blocks of a predetermined size, and the image data of each block is sequentially written to a predetermined address in a memory by a write address. At the same time, a predetermined operation is performed on the address of the stored input image data before conversion based on the conversion input data separately input by the input means by the operator, and the input image is converted into a predetermined 3 When assembling the output image by a raster scan so as to obtain an output image VDOUT (FIG. 5 (C)) attached to a three-dimensional curved surface, the output image is obtained according to a read address obtained by the operation result. By reading the image data of the block stored at a predetermined address in the memory,
An output image VDOUT1 composed of a two-dimensional plane as if the input image was apparently converted into a three-dimensional curved surface is obtained.

In this case, as shown in FIG. 5 (B), a blanking BLK at a black level is inserted. However, in this case, a black line appears on the converted surface.

Here, when performing the image conversion, aliasing occurs at the boundary between the front surface and the back surface, and the input image VD is removed in order to remove noise components generated around the input image VDIN as noise.
A so-called clipping process for cutting a predetermined area of IN is performed.

That is, as shown in FIG. 6, reference numeral 1 denotes an image conversion device as a whole, and an input video signal SVIN is stored in a frame memory 2
To enter.

The frame memory 2 divides the image data for one frame of the input image VDIN input by the input video signal SVIN into a predetermined size based on the write address signal S1 sent from the write address generation circuit 4. For each block, an address in the frame memory 2 is designated, and the image data of each block is sequentially stored according to the assigned address.

Here, the CPU (central processing unit) 11 reads the image data of each block of the input image VDIN stored in the frame memory 2 from the read address generation circuit 12 to the address blanking (BLK) setting circuit 13 and the front / back control circuit 14. The readout is performed by a read address signal S9 transmitted through the CPU, so that each block of the input image VDIN is sequentially formed on a polygonal pseudo curved surface on a predetermined three-dimensional curved surface (for example, a cylindrical curved surface) IM (FIG. 5 (C)). It is converted into an output image VDOUT1 that is pasted.

Here, the CPU 11 clips the clipping designation signal S11 which is set to a blanking area BLK having a black level around the key image KYIN of the white image composed of the key image signal SKYIN input to the BLK addition circuit 6. By transmitting the signal to the BLK generating circuit 16, the clipping BLK additional signal S12 is transmitted from the clipping BLK generating circuit 16 to the BLK adding circuit 6, whereby a blanking area BLK is formed in a predetermined area of the white image (KYIN). The clipping key image signal S13 is sent to the subsequent frame memory 8.

The frame memory 8 writes the incoming clipping key image signal S13 at a predetermined address for each predetermined block based on the write address signal S1 sent from the write address generation circuit 4.

The stored image data in each address is read by a read address signal S9 sent from the front and back control circuit 14, and is read as a key signal SKEY by the keying circuit 3.
Sent to

The keying circuit 3 is a circuit for executing a so-called clipping process for adding a blanking area BLK to an area specified by the key signal SKEY to the three-dimensional surface image signal SVIM sent from the frame memory 2. When a blanking area BLK is set in a predetermined area of the image KYIN, the key image KYIN is subjected to a process of being superimposed on the above-described three-dimensional curved surface IM, as shown in FIG. 5 (C). A blanking region BLK is formed above the cylindrical surface IM, whereby the upper portion of the cylindrical surface IM is clipped, and an input image VDIN serving as an original image of the cylindrical surface IM is formed.
The noise component generated above can be made invisible on the output image VDOUT.

However, when clipping a part of the cylindrical curved surface IM, as shown in FIG. 5 (C), the blanking region BLK1 on the back surface VDB side of the cylindrical curved surface IM has a background color Δ
By making it the same as 1, it can be made invisible so that a black level band occurs due to blanking between the front surface VDF and the back surface VDB of the cylindrical curved surface IM. In addition, there is a problem that the blanking region BLK2 appears as an unsightly black line.

Accordingly, in this case, it is considered that the black line can be prevented from being generated by not reading out the address of the image data corresponding to the blanking area BLK2 of the image by the clipping process in FIG.

That is, the CPU 11 sends the BLK setting signal S6 for setting the blanking region to the address BLK setting circuit 13, so that the read table address signal S3F corresponding to the image on the front side of the cylindrical curved surface IM in the address BLK setting circuit 13 and , Read back address signal S corresponding to the image on the back VDB side
For 3B, a read front address signal S4F and a read back address signal S4B are formed to prevent reading of the address where the blanking region BLK is formed, and are sent to the subsequent front and back control circuit 14.

The front-back control circuit 14 receives the read-out front address signal S4F.
Of the read back address signal S4B, by outputting the read table address signal S4F with priority, the image on the back surface VDB side can be hidden by the image on the front surface VDF side in the cylindrical curved surface IM obtained as an output image. it can.

By forming the cylindrical curved surface IM by using the read address signal S9 in which the address of the blanking area BLK is not read in this way, an unsightly black line BLK2 (FIG. 5 (C)) is prevented. obtain.

However, according to such a method, blanking BLKs having a black level as a whole are inserted as shown in FIG. 5 (B). However, in this case, addresses become discontinuous in all of these portions, and 5 As shown in FIG.
A step-like jagged portion is generated in all portions corresponding to the black level, and there is a problem that the portion where the jagged portion occurs becomes relatively large, which is still insufficient as a solution.

The present invention has been made in consideration of the above points, and has as its object to propose an image conversion apparatus that can more effectively prevent the generation of black lines in a blanking area.

Means for Solving the Problem In order to solve the problem, according to the present invention, a memory 2 for storing an input image VDIN formed of a two-dimensional plane formed by an input video signal SVIN, and an input image SV of the memory 2
A computing unit 11 for computing a read address for performing image conversion such as dividing the IN into a predetermined size and pasting it on the three-dimensional curved surface IM, and reading image data from a memory based on the read address obtained as a result of the computation. Reading means 12
When the input image area of the input image SVIN corresponding to the back surface of the three-dimensional curved surface IM is read from the memory, clipping processing for deleting a part of the three-dimensional curved surface IM is performed. Control means for controlling the reading means 12 so as not to perform clipping processing when reading the input image horizontal area of the input image SVIN corresponding to the surface from the memory 2
14, 21, 22B, and 22F.

F effect In the image conversion apparatus 20, a clipping process is performed such that a blanking area BLK that becomes a black level is formed in a part of the input image VDIN to delete a part of the two-dimensional curved surface IM obtained as the output image VDOUT2. At the time, a three-dimensional surface
By performing the clipping process when reading the image data corresponding to the back surface of the three-dimensional curved surface IM from the memory without performing the clipping process when reading the image data corresponding to the front surface of the IM from the memory, the output image 2 can be obtained.
An unsightly black line can be prevented from being generated between the image corresponding to the display of the three-dimensional curved surface IM and the image corresponding to the back surface, and unpleasant jaggedness between the image corresponding to the back surface of the three-dimensional curved surface IM and the background image. May not occur.

G Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In FIG. 1 in which parts corresponding to those in FIG. 6 are denoted by the same reference numerals, the image conversion apparatus 20 inputs an address BLK setting signal S6 sent from the CPU 11 in the address BLK control circuit 21, where the address BLK setting is performed. Select whether the blanking area BLK specified by the signal S6 is an image on the front surface VDF side with a higher display priority of the cylindrical curved surface IM or an image on the back surface VDB side with a lower display priority, and In the case of the image on the side, an address BLK interlocking signal S20F for controlling not to read the address of the blanking area BLK is transmitted to the following table address BLK setting circuit 22F in accordance with the blanking area BLK.

Accordingly, in the table address BLK setting circuit 22F, of the read table address signal S3F input from the read address generation circuit 12, a read table address signal capable of preventing image data from being read from an address corresponding to the blanking area BLK. S24F is formed, followed by front and back control circuit 14
To send to.

On the other hand, if the blanking area BLK specified by the address BLK setting signal S6 is an image on the back surface VDB side of the cylindrical curved surface IM, the address BLK control circuit 21 sends the address to the subsequent back address BLK setting circuit 22B. An address BLK fixed signal S20F for controlling to read all addresses regardless of the blanking area BLK is transmitted.

Accordingly, in the back address BLK setting circuit 22B, all the image data including the image data from the address corresponding to the blanking area BLK is obtained for the read back address signal S3B input from the read address generation circuit 12. A read back address signal S24B is formed and sent to the subsequent front / back control circuit 14.

The surface VD of the cylindrical surface IM obtained as an output image
On the F side, a blanking region BLK2 (Fig. 5 (C))
Is not read out, black lines can be prevented from being generated in this portion as shown in FIG. 2, and a blanking region BLK1 (FIG. 5C) is formed on the back surface VDB side of the cylindrical curved surface IM. 2), the blanking region BLK1 is formed in this portion as shown in FIG. 2, and the blanking region BLK1 is formed by the same color as the background color # 1 of the output image VDOUT2. In this portion, the blanking region BLK1 can be made invisible.

In the above configuration, the image conversion device 20 performs the input image VDIN
When image data on the front surface VDF side or image data on the back side VDB side are read out from the frame memory 2 in the image conversion process of converting the image into a cylindrical curved surface IM, the By selecting whether to read the read address up to the blanking area BLK, an address BLK fixed mode for generating the black line BLK1 or an address BLK interlock mode for not generating the black line BLK2 is executed.

That is, as shown in FIG. 3A, in the frame memory, addresses assigned to image data in an image of one frame, for example, are −377 to +377 in the horizontal direction and −242 to +242 in the vertical direction. As shown in FIG. 7B, for example, when the vertical address range V = + 200 to +242 is clipped, the address read range of the read address is set to -242 to +200 in the address BLK interlocking mode, whereby The clipping processing range (that is, the blanking area BLK) will not be read.

Therefore, in the output image VDOUT2, the blanking area BLK can be prevented from being displayed.

On the other hand, in the address BLK fixed mode, even if the blanking area BLK is formed by the clipping processing, the blanking area BLK is displayed in the output image VDOUT2 by reading the image data from all the addresses. be able to.

Therefore, based on the BLK range (reading area) setting signal S6 input from the CPU 11, the address BLK control circuit 21 (FIG. 1) converts the image data to be read out at this time to the surface VDF side of the cylindrical surface IM. In the case of this image, by executing the address interlocking mode, a readout table address signal S24F that does not read out the clipping range in the following table address setting circuit 22F is obtained, and the BLK setting range is set to the back surface VDB of the cylindrical curved surface IM. If the image is on the side,
By executing the address fixing mode, the read back address signal S2 for reading the clipping range together with other image data in the subsequent back address BLK setting circuit 22B.
Get 4B.

Therefore, as shown in FIG. 2, the conventional example (FIG. 5 (C))
Can be obtained as the output image VDOUT2 such that the black line BLK2 generated in the above does not occur.

According to the above configuration, the surface VD
The reading priority order of the image data on the F side and the back VDB side is detected, and the reading address range of the image (VDF) having a high display priority is controlled so as not to read the clipping range (BLK), and the display priority is low. Image (VD
The read address range of B) is controlled so as to include the clipping range, so that an unsightly black line BLK2 of the cylindrical surface IM obtained as the output image VDOUT2 is obtained.
(FIG. 5 (C)) can be effectively avoided.

On the surface VDF side of the cylindrical curved surface IM, the black line BLK2 does not occur, but the address becomes discontinuous, but the jaggedness occurs.However, the screen is actually more invisible than the black line BLK2 occurs. Unnaturalness can be reduced.

In the above-described embodiment, a case has been described in which the image conversion processing is performed such that the input image VDIN is wound in a cylindrical shape. However, the present invention is not limited to this. For example, a page may be turned as shown in FIG. It can be applied when executing various special effects such as when performing a so-called page turn effect process.

In this case, for example, when performing the page turn effect processing, the back image VDB is prioritized to the front image VDF, and the read address range of the back image VDB is set to the clipping range by setting the back image VDB as an image having a higher display priority. In this case, the clipping range may be controlled so as not to read the read address range of the back image VDB.

In the above embodiment, the case where the clipping region is set in the vertical address range has been described. However, the present invention is not limited to this, and the clipping region is set in various ranges such as setting the clipping region in the horizontal address range. When it can be widely applied.

H Advantageous Effects of the Invention As described above, according to the present invention, an input image formed of a two-dimensional plane formed by an input video signal is stored in a memory, and the input image of the memory is divided into a predetermined size.
In an image conversion apparatus that performs an image conversion operation such as pasting on a three-dimensional curved surface and reads image data from a memory based on a read address obtained as a result of the operation, when reading an input image area for the back surface of a three-dimensional curved surface from a memory, A three-dimensional surface obtained as an output image by performing a clipping process for deleting a part of the three-dimensional surface and not performing the clipping process when reading an input image area corresponding to the surface of the three-dimensional surface from the memory. Can be effectively avoided in the image representing.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an image conversion apparatus according to the present invention, FIG. 2 is a schematic diagram showing an output image according to the embodiment, and FIG. 3 is a setting of a read address range in conjunction with clipping processing in a memory. , FIG. 4 is a schematic diagram illustrating an output image according to another embodiment, FIG. 5 is a schematic diagram illustrating an image conversion according to a conventional example, and FIG. 6 is a conventional image conversion. It is a block diagram which shows an apparatus. 1, 20 image conversion device, 2, 8 frame memory,
3 ... Keying circuit, 6 ... BLK additional circuit, 11 ... CP
U, 12: Read address generation circuit, 21: Address BLK
Control circuit, 22B: Back address BLK setting circuit, 22F: Front address BLK setting circuit, VDOUT1, VDOUT2: Output image, I
M: Cylindrical curved surface, BLK1, BLK2: Blanking area.

Claims (1)

(57) [Claims] A memory for storing an input image formed of a two-dimensional plane formed by an input video signal; and a memory for dividing the input image in the memory into a predetermined size.
Calculating means for calculating a read address for performing image conversion such as pasting on a three-dimensional curved surface; reading means for reading the image data from the memory based on the read address obtained as a result of the calculation; and connection to the reading means When reading the input image area of the input image corresponding to the back surface of the three-dimensional curved surface from the memory, a clipping process for deleting a part of the three-dimensional curved surface is performed, and the clipping process corresponding to the front surface of the three-dimensional curved surface is performed. And a control means for controlling the reading means so that the clipping process is not performed when the input image area of the input image is read from the memory.