JPH04207870A - Image converter - Google Patents

Abstract

PURPOSE:To effectively avert the generation of unsightly black lines in output images by prohibiting the reading out of the image of a clipping region at the time of reading out the image region of high display priority of a three- dimensionally curved surface from a memory and by reading out the image of the clipping region at the time of reading out the image region of the low display priority of the three-dimensionally curved surface from the memory. CONSTITUTION:An address BLK(blanking) control circuit 21 obtains such a reading out front address signal S24F which does not read out the clipping range in a succeeding front address setting circuit 22F by executing an address interlock mode when the image data to be subjected to reading out processing at this time is the image on the surface VDF side of the cylindrical curved surface IM in accordance with the BLK range (reading out range) inputted from a CPU 11. The above-mentioned circuit obtains such a reading out rear address signal S24B which reads out the clipping range together with the other image data in a succeeding rear address BLK setting circuit 22B by executing an address fix mode when the BLK setting range is the image on the rear surface BDV side of the cylindrical curved surface IM.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to an image conversion device, and is particularly suitable for application to a special effects device that applies special effects to television signals.

B. Summary of the Invention The present invention outputs an input image stored in a memory based on a read address obtained as a result of predetermined arithmetic processing, and assigns display priorities to front and back images of the input image. In an image conversion device that converts an input image into a three-dimensional curved surface image by outputting it, when performing ripping processing such as deleting a part of the three-dimensional curved surface, the display priority of the three-dimensional curved surface can be changed. By preventing images in the clipping area from being read when reading a high image area from memory and reading images from the clipping area when reading an image area with a low display priority of a three-dimensional curved surface from memory, it is possible to The generation of unsightly black lines on the resulting three-dimensional curved surface can be effectively avoided.

C. Conventional technology Conventionally, this type of special effects device converts a television signal into a digital signal to create an image on a display that looks like an input image pasted onto a three-dimensional curved surface (for example, a cylindrical curved surface). A display device has been proposed (Japanese Unexamined Patent Publication No. 61-230477).

This type of image conversion method divides the input image VDIN as shown in FIG. 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 inputted by the operator using a separate input means, and the input image is converted into a predetermined three-dimensional image.
When assembling the output image by rask scanning, as shown in the output image VDO1JT (Fig. 5 (C)), which looks like it has been pasted on a dimensional curved surface, it is stored at a predetermined address in the memory according to the read address obtained from the above calculation result. By reading out the image data of the stored blocks, the input image is converted into a two-dimensional curved surface.
An output image VDOUTI consisting of a dimensional plane is obtained.

When performing the image conversion here, in order to remove noise components generated around the input image VDIN, the input image VDIN is
A so-called clipping process is performed to cut a predetermined area of IN.

That is, as shown in FIG. 6, 1 indicates an image conversion device as a whole, and inputs an input video signal 5VTN to a frame memory 2. As shown in FIG.

Based on the write address signal S1 sent from the write address generation circuit 4, the frame memory 2 selects one of the human images VDIN input by the input video signal 5VIH.
An address within the frame memory 2 is designated for each block formed by dividing one frame's worth of image data into predetermined sizes, and the image data of each block is sequentially stored in accordance with the assigned address.

Here, the CPU (central processing unit) 11 reads out 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. By reading out each block of the input image VDIN using the readout address signal S9 sent through the input image VDIN, each block of the input image VDIN is converted into a predetermined three-dimensional curved surface (for example, a cylindrical curved surface) IM (see FIG. 5).
C)) The output image VDOUTI is converted into an output image VDOUTI which is successively pasted onto the above polygonal surface.

Here, the CPU 1 is a key image KYI of a white image consisting of a key image signal 5KYIN inputted to the BLK addition circuit 6.
Blanking area BLK with black level around N
Clipping designation signal Sll configured to set
By sending out the clipping BLK generation circuit 16 to the clipping BLK generation circuit 16, the clipping BLK addition signal S12 is sent from the clipping BLK generation circuit 16 to the BLK addition circuit 6, thereby adding a blanking area BLK to a predetermined area of the white image (KYIN). The clipping key image signal S13 in which the image data is formed is sent to the subsequent frame memory 8.

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

Further, the image data in each stored address is read out by a read address signal S9 sent from the front/back control circuit 14, and sent to the keying circuit 3 as a key signal 5KEY.

The keying circuit 3 receives 3 signals sent from the frame memory 2.
Key signal 5KEY for dimensional curved surface image signal SVIM
This is a circuit that executes so-called clipping processing that adds a blanking area BLK to an area specified by
If K is set, the key image KYIN is
By performing superimposition processing on the dimensional curved surface IM, a blanking area BLK is formed in the upper part of the cylindrical curved surface IM as shown in FIG. and the cylindrical curved surface I
The noise component generated on the input image vDIN, which is the original image of M, can be made invisible on the output image VDOUT.

D Problems to be Solved by the Invention However, when attempting to clip a part of such a cylindrical curved surface IM, the cylindrical curved surface I as shown in FIG.
On the back VDB side of M, there is a blanking area BLKI.
is the same as the background color X1, making it invisible to the naked eye, whereas the cylindrical curved surface IM
There was a problem in that the blanking area BLK2 appeared as an unsightly black line between the front side VDF and the back side VDBO.

Therefore, in this case, by preventing the address of the image data corresponding to the blanking area BLK2 of the image from being read out by the clipping process in FIG.
It is thought that it is possible to prevent the black line from occurring.

That is, the CPU II sets the blanking area.
By sending the LK setting signal S6 to the address BLK setting circuit 13, the address BLK setting circuit 13 reads out the front address signal 33F corresponding to the image on the front side of the cylindrical curved surface IM and reads out the image corresponding to the image on the back side VDB side. The front/back control circuit 1 forms a read front address signal 34F and a read back address signal S4B in such a manner that the address where the blanking area BLK is formed is not read in response to the back address signal 33B.
Send to 4.

The front and back control circuit 14 receives the incoming readout front address signal 34.
By giving priority to outputting the readout front address signal 34F among F and the readout back address signal 34B, the image on the back side VDB side is hidden by the image on the front side VDF side in the cylindrical curved surface IM obtained as an output image. I can do it.

By forming the cylindrical curved surface IM using the read address signal S9 that prevents the address of the blanking area BLK from being read in this way, the unsightly black line BL can be eliminated.
K2 (FIG. 5(C)) can be prevented from occurring.

However, according to this method, by not reading the address in the blanking area BLK, the address becomes discontinuous in this part,
As a result, interpolation processing could not be executed in the blanking area BLK, resulting in the problem of step-like jaggedness G1 as shown in FIG. 5(D), which was still insufficient as a solution. .

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose an image conversion device that can more effectively prevent the appearance of black lines in blanking areas.

E Means for Solving the Problems In order to solve the problems, in the present invention, an input image VDIN which is a two-dimensional plane formed by an input video signal 5VIN is stored in the memory 2, and the input image VDIN in the memory 2 is stored in a predetermined manner. The image data is divided into sizes of polygons on the three-dimensional curved surface IM and pasted onto the curved surface, and the image data is read out from the memory 2 based on the read address obtained as a result of the image transformation operation. By doing this, the three-dimensional curved surface IM is set to 2 as the output image VDOUT2.
In the image conversion device 20 that performs clipping processing on a part of the three-dimensional curved surface IM while displaying it on a dimensional plane, the clipping region BLK is used when reading an image region with a high display priority of the three-dimensional curved surface IM from the memory 2. The image in the clipping area BLK is read out when an image area with a low display priority of the three-dimensional curved surface IM is read out from the memory 2.

In the F-effect image conversion device 20, when performing a ripping process to delete a part of the three-dimensional curved surface IM obtained as the output image VDOUT2 by forming a blanking area BLK in a part of the input image VDIN, When reading an image area with a high display priority of the dimensional curved surface IM from the memory, an image in a clipping area (blanking area) is not read out, and an image area with a low display priority of the 3D curved surface IM is read from the memory. By reading out the image in the clipping area (blanking area) at the time, an unsightly black line is created between the image area with high display priority and the image area with low display priority on the three-dimensional curved surface IM obtained as the output image. This can be prevented from occurring, and the appearance of unsightly jagged edges between an image area with a low display priority and the background can be prevented.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, in which parts corresponding to those in FIG. 6 are given the same reference numerals, the image conversion device 20 converts the address BLK setting signal S6 sent from the CPU 1 to the address BLKIIJ?
11 circuit 21 and designated here by the address BLK setting signal S6.
Select whether it is an image on the front VDF side with a high display priority of the cylindrical curved surface IM or an image on the back VDB side with a low display priority, and if it is an image on the front VDF side, the following front address BLK An address BLK that controls the setting circuit 22F not to read the address of the blanking area BLK according to the blanking area BLK.
Sends interlocking signal 320F.

Therefore, in the table address BLK setting circuit 22F, among the readout table address signals 33F inputted from the readout address generation circuit 12, a readout table address signal 324F that can prevent image data from the address corresponding to the blanking area BLK from being read out. is formed and sent to the subsequent front/back control circuit 14.

On the other hand, the blanking area BLK specified by the address BLK setting signal S6 is the back surface V of the cylindrical curved surface IM.
If the image is on the DB side, the address BLK control circuit 21 sends an address BLK fixing signal 320F that controls the subsequent back address BLK setting circuit 22B to read all addresses regardless of the blanking area BLK. .

Therefore, in the back address BLK setting circuit 22B, for the read back address signal S3B inputted from the read address generation circuit 12, all image data including image data from the address corresponding to the blanking area BLK can be read out. address signal 324
B is formed and sent to the front/back control circuit 14.

The surface V of the cylindrical curved surface IM obtained as the resultant output image
On the DF side, the blanking area BLK2 (Fig. 5 (
C))) address data is not read out,
As shown in FIG. 2, it is possible to prevent black lines from occurring in this part, and on the back surface VDB side of the cylindrical curved surface IM, there is a blanking area BLKI (FIG. 5 (C)).
By reading out the address data, the blanking area BLKI is created in this part as shown in FIG.
is formed, and the blanking area BLKI is configured with the same color as the background color X1 of the output image VDOUT2, so that the blanking area BLKI can be made invisible in this portion.

In the above configuration, the image conversion device 20 converts the input image VD
In the image conversion process of image converting IN to the cylindrical curved surface IM, when reading the image data on the front VDF side or the image data on the back VDB side from the frame memory 2, depending on the image data on the front VDF side or the back VDB side, By selecting whether or not to read the read address up to the blanking area BLK, the address BLK fixed mode in which the black line BLKI is generated or the address BLK interlocking mode in which the black line BLKI is not generated is executed.

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

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 a blanking area BLK is formed by the clipping and topping processing, the blanking area BLK is displayed in the output image VDOUT2 by reading image data from all addresses. be able to.

Therefore, the address BLK control circuit 21 (FIG. 1)
Based on the BLK range (readout area) setting signal S6 input from the PUII, if the image data to be read out at this time is an image on the surface VDF side of the cylindrical curved surface IM, the address linked mode is executed. As a result, the readout table address signal 324 is such that the clipping range is not read out in the subsequent table address setting circuit 22F.
F and when the BLK setting range is an image on the back side VDB side of the cylindrical curved surface IM, by executing the address fixed mode, the following back address BLK setting circuit 2
At 2B, a readout back address signal 324B for reading out the clipping range along with other image data is obtained.

Therefore, as shown in FIG. 2, a cylindrical curved surface IM in which the black line BLK2 that occurs in the conventional example (FIG. 5(C)) does not occur can be obtained as the output image VDOUT2.

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 readout address range of the image (VDF) with a high display priority is controlled not to read out the clipping range (BLK), and the readout address range of the image data with a low display priority is controlled so as not to be read. By controlling the reading address range of the image (VDB) to include the clipping range, the unsightly black line BLK2 (Fig. 5 (C)) on the cylindrical curved surface IM obtained as the output image VDOUT2 can be made effective. can be avoided.

Incidentally, on the surface VDF side of the cylindrical curved surface IM, the black line BLK
2 does not occur, but the addresses become discontinuous, causing jaggedness. However, in reality, the unnaturalness of the screen can be reduced compared to the case where the black line BLK2 occurs.

In the above-mentioned embodiment, a case was described in which an image conversion process was performed in which the input image VDIN was wrapped in a cylindrical shape. However, the present invention is not limited to this. For example, as shown in FIG. It can be applied when performing various special effects, such as when applying a so-called page turn effect processing that looks like this.

In this case, for example, when applying page turn effect processing,
By giving priority to the surface image VDB over the surface image VDF, the readout address range of the surface image VDB is linked to the clipping range as the surface image VDB is regarded as an image with a high display priority, and the readout address range of the surface image DB is clipped. All you have to do is control it so that the range is not read.

Further, in the above embodiment, a case was described in which a clipping area is set in a vertical address range, but the present invention is not limited to this, and the clipping area can be set in various ranges, such as setting a clipping area in a horizontal address range. It can be widely applied.

H Effects of the Invention As described above, according to the present invention, the readout address range of an image with a high display priority is linked to the clipping range,
In addition to preventing the image data from being read from the clipping range, the image data is also read from the addresses in the clipping range for the read address range of images with low display priority, thereby eliminating unsightly black lines in the output image. It is therefore possible to realize an image conversion device that can effectively avoid the occurrence of .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an image conversion device according to the present invention, FIG. 2 is a route map showing an output image according to the embodiment, and FIG. Route map for explanation, No. 4
5 is a route map showing an output image according to another embodiment, FIG. 5 is a route map for explaining image conversion according to a conventional example, and FIG. 6 is a block diagram showing a conventional image converting device. 1.20... Image conversion device, 2.8...
・Frame memory, 3... Keying circuit, 6
...BLK addition circuit, 11...CPU
, 12... Read address generation circuit, 21...
...Address BLK! 116 circuits, 22B...
...Back address BLK setting circuit, 22F...Front address BLK setting circuit, VDOUTI, VDOUT2
...Output image, IM...Cylindrical curved surface, B
LKI, BLK2...Blanking area.

Claims (1)

[Claims] An input image consisting of a two-dimensional plane formed by an input video signal is stored in a memory, and the input image in the memory is divided into predetermined sizes to create a pseudo polygon on a three-dimensional curved surface. By executing an image conversion operation such as pasting onto a curved surface and reading out the image data from the memory based on the read address obtained as a result of the image conversion operation, the above 3.
In an image conversion device that displays a dimensional curved surface as an output image on a two-dimensional plane and also performs clipping processing on a part of the 3-dimensional curved surface, an image area with a high display priority of the 3-dimensional curved surface is extracted from the memory. Image conversion characterized in that the image in the clipping area is not read out when reading out the image, and the image in the clipping area is read out when reading out an image area with a low display priority of the three-dimensional curved surface from the memory. Device.