JPH04343584A - Image data processor - Google Patents

Abstract

PURPOSE:To form defocused image data for image conversion processing by changing the filter coefficient of an anti-aliasing filter in accordance with defocusing data and the contraction ratio data of input image data. CONSTITUTION:A defocusing data forming circuit 18 forms defocusing data S4 from data S6 for specifying a depth focus position, inclination data S7 for specifying the inclination of image blur degree to the front and back sides of a specified focus position and depth data S5 belonging to input image data S1. The filter coefficient S8 of the anti-aliasing filter 5 is changed in accordance with the data 4 and the contraction ratio data S3 of the data S1. Consequently image conversion processing image data S2 defocused so as to be focused only on a prescribed position in the depth direction of an image displayed on a screen and blurred on the front or back side of the prescribed position can be formed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image data processing device suitable for application to, for example, an image conversion device that realizes geometrical deformation of an input image using an image memory.

0002

[Prior Art] Conventionally, in a special effects device that generates image data corresponding to, for example, an image of a person placed in a container such as a flask, the input image data is enlarged, reduced, rotated, etc. Alternatively, there is a need for an image conversion device that outputs image data that has been subjected to even more complicated geometric transformation processing.

[0003] As such an image conversion device, for example, one proposed in Japanese Patent Laid-Open No. 63-208984 filed by the present applicant is known. The configuration of this image conversion device is shown in FIG.

In FIG. 4, 1 is an input image memory, and this input image memory 1 has memory cells corresponding to pixels.
For example, input image data for each pixel in an image displayed on a television screen is stored. This input image data is converted into data corresponding to an arbitrary figure by the conversion processing section 4 using data from the interpolation calculation circuit 2, and is written into the output image memory 3 after being subjected to so-called mapping processing. In this case, the conversion processing unit 4 and the interpolation calculation circuit 2 convert each pixel data constituting the input image data into blocks (for example, blocks of 8 pixels x 8 pixels).
It is processed separately. This is to process image conversion in real time.

As shown in FIG. 5, an anti-aliasing filter 5 is inserted on the input side of the image conversion apparatus constructed as described above. The anti-aliasing filter 5 includes a memory 6, an interpolation circuit 7, a filter coefficient generation circuit 8, and a low-pass filter 9. The memory 6 stores the reduction rate data for each block supplied from the interpolation calculation circuit 2 corresponding to one screen, and the interpolation circuit 7 interpolates the reduction rate of a predetermined pixel in the block. Find it by The filter coefficient generation circuit 8 generates a filter coefficient S8 for each pixel according to the reduction ratio determined by the interpolation process, and supplies the generated filter coefficient S8 to the low-pass filter 9. By varying the cutoff frequency of the low-pass filter 9 using the filter coefficient S8, the input image data S1 supplied from the input terminal 10 is subjected to anti-aliasing processing, which blurs the edge portion of the image corresponding to the pixel. You can perform processing to make the part less noticeable.

[0006]

[Problems to be Solved by the Invention] However, in such an image conversion device, there is a defocusing process that uniformly blurs the entire screen, or a process that focuses only on a predetermined position in the depth direction of the image displayed on the screen. Defocus processing that blurs the front or back side of the image is considered to be attracting attention as a special effect process.

However, the conventional image conversion apparatus described above has a problem in that it cannot perform such defocus processing.

The present invention has been made in view of the above problems, and an object thereof is to provide an image data processing device that can generate defocused image data for image conversion processing. do.

[0009]

[Means for Solving the Problems] The image data processing apparatus of the present invention, for example, as shown in FIG.
In an image data processing device that converts image data S2 into image data S2 for image conversion processing through
Tilt data S7 specifying the tilt of the degree of blurring of the image toward the front side and the rear side of the focal position specified by;
It has a defocus data generation circuit 18 which is supplied with depth data S5 attached to input image data S1 and generates defocus data S4, and which generates defocus data S4 of this defocus data generation circuit 18 and input image data S1. The filter coefficient S8 of the anti-aliasing filter 5 is changed in accordance with the reduction rate data S3.

0010

[Operation] According to the image data processing apparatus of the present invention, the defocus data generation circuit 18 receives the supplied focus position data S6 specifying the focus position in the depth direction and the focus position data S6 specifying the focus position in the depth direction. Defocus data S4 is generated from tilt data S7 that specifies the tilt of the degree of blurring of the image toward the front and back sides, and depth data S5 attached to the input image data S1, and the defocus data generated in this way is Since the filter coefficient S8 of the anti-aliasing filter 5 is changed according to S4 and the reduction ratio data S3 of the input image data S1, the focus is focused only on a predetermined position in the depth direction of the image displayed on the screen. , it is possible to generate image data S2 for image conversion processing that has been subjected to defocus processing to blur the front side or rear side thereof.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the image data processing apparatus of the present invention will be described below with reference to the drawings. In the drawings referred to below, parts corresponding to those shown in FIGS. 4 and 5 described above are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In FIG. 1, reference numeral 1 denotes an input image memory, and this input image memory 1 has memory cells corresponding to pixels.
For example, image data S2 for each pixel in an image displayed on a television screen is stored. This image data S2 is generated by applying an anti-aliasing filter (a
5. Note that the input image data S1 is
For example, DVE (Digital Video
o Effect) is a digital video signal output from the device.

The anti-aliasing filter 5 includes a memory 6, an interpolation circuit 7, a filter coefficient generation circuit 8, and a low-pass filter 9. The memory 6 stores reduction rate data S3 corresponding to one screen for each block (for example, a block of 8 pixels x 8 pixels) supplied from an interpolation calculation circuit (not shown) through the input terminal 11, and the interpolation circuit 7
The reduction ratio of a predetermined pixel in the block is determined by interpolation processing and is supplied to one input terminal of the filter coefficient generation circuit 8.

Defocus data of a predetermined pixel is supplied from the interpolation circuit 17 to the other input terminal of the filter coefficient generation circuit 8 . This interpolation circuit 17 is supplied with data from a defocus data generation circuit 18 to a memory 16 for each block (in this case, a block of 8 pixels x 8 pixels; hereinafter, in this embodiment, a block is assumed to be 8 pixels x 8 pixels). Defocus data S4 is supplied. Note that the interpolation circuit 17 and the memory 16 are the same as the interpolation circuit 7 described above, respectively.
and has the same configuration as the memory 6.

The defocus data generation circuit 18 has two input terminals, one of which is supplied with depth data S5 for each block from an input terminal 19. This depth data S5 is data in which the depth data for each pixel attached to the input image data S1 for each pixel described above is summarized for each block. The other input terminal of the defocus data generation circuit 18 is supplied with focus position data S6 for each block and tilt data S7 for each block. Here, the focus position data S6 is data that specifies the focus position in the depth direction of the three-dimensional image displayed on the screen. The tilt data S7 is data that specifies the tilt of the degree of blurring of the image toward the front and back of the focal position specified by the focal position data S6 as a reference position.

These focal position data S6 and tilt data S
7 is generated and supplied by the controller 20. A keyboard (not shown) is connected to this controller 20, and predetermined focus position data S6 and tilt data S7 are generated by an operator operating the keyboard.

An example of the focus position data S6 and the tilt data S7 is shown in FIG. 2A as a characteristic 31 in relation to the degree of blur (degree of blur). In the example of FIG. 2A, the focus position data S6 specifying the focus position in the depth direction is selected to be S6=d1. Further, the tilt data S7 indicating the degree of blur using the focal point position d1 as a reference position is selected to be S7=θ degrees.

Next, the operation of the above embodiment will be explained.

First, focus position data S6 and tilt data S7 corresponding to the characteristic 31 as shown in FIG. 2A are supplied from the controller 20 to the defocus generation circuit 18. Here, since the depth data S5 for each block is supplied to the defocus generation circuit 18 in synchronization with a predetermined clock signal, the depth data S5 is converted into defocus data for each block according to the characteristic 31 shown in FIG. 2A. S4
and stored in the memory 16. 1 for memory 16
Defocus data S4 for each block of the screen is stored. Note that the defocus data generation circuit 18 is RO
It can be composed of M.

On the other hand, the memory 6 constituting the anti-aliasing filter 5 is also supplied with block-by-block reduction rate data S3 in synchronization with the clock signal, and similarly to the memory 16, the block-by-block reduction rate data S3 for one screen is supplied to the memory 6. The reduction rate data S3 of is stored. Then, the reduction rate data S3 for each block stored in the memory 6 and the defocus data S4 for each block stored in the memory 16 are read out in accordance with the scanning timing of the television signal, respectively. Interpolation processing (interpolation processing) is performed in the interpolation circuits 7 and 17, and the data is converted into reduction rate data and defocus data for each pixel, and then sent to the filter coefficient generation circuit 8.
is supplied to The filter coefficient generation circuit 8 supplies a filter coefficient S8 for each pixel to the low-pass filter 9 from the supplied reduction rate data and defocus data for each pixel.

Therefore, input image data S for each pixel
1 is a low-pass filter 9 with a different cutoff frequency for each pixel.
and stored in the input image memory 1 as image data S2 for image conversion processing. Considering the display of the image formed by this image data S2 on the screen, the image is an image that is focused only at a predetermined position in the depth direction of the image (focal position d1, see FIG. 2A), and The image becomes blurred gradually on the side and back sides.

[0022] As for the defocus processing, FIG. 2A
In addition to the example of characteristic 31, as shown in characteristic 32 of FIG. have different properties, or property 34
It is also possible to set the focus position to d2 and make the slope steep, as shown in Figure 3, and to have some blur even at the focus position d2, or to make it uniformly blurred as shown in characteristic 35. be. Further, the slope may be such that the characteristic becomes a curve instead of a straight line as described above.

As described above, according to the above embodiment, the defocus process uniformly blurs the entire screen, focuses only on a predetermined position in the depth direction of the image displayed on the screen,
It is possible to obtain image data S2 that has been subjected to defocus processing such that the front side or the rear side thereof is blurred.

FIG. 3 is a block diagram showing the configuration of an image data processing apparatus according to another embodiment of the present invention. In the example in FIG. 3, the same reference numerals are given to the parts corresponding to the example in FIG. 1 described above, and detailed explanation thereof will be omitted.

In the example shown in FIG. 3, a data mixing circuit 21 composed of a multiplier is provided, and this data mixing circuit 21 receives reduction ratio data S3 for each block and defocus data for each block generated by the defocus data generation circuit 18. Data S
4. Then, the data mixing circuit 21 multiplies these reduction rate data S3 and defocus data S4, and obtains data for each block after the multiplication process (hereinafter referred to as defocus data S9).
is stored in a memory 6 constituting the anti-aliasing filter 5. The interpolation circuit 8 generates defocus data for each pixel by interpolation processing from the defocus data S9 for each block, and supplies it to the filter coefficient generation circuit 8.

Therefore, the filter coefficient generation circuit 8 generates a filter coefficient S8 for each pixel from the supplied defocus data for each pixel and supplies it to the low-pass filter 9. In this case, the filter coefficient S8 is data that takes into account the reduction rate data S3 and the defocus data S4, so the entire screen is uniformly blurred, similar to the embodiment shown in FIG. 1 above. It is possible to obtain image data S2 that has been subjected to defocus processing or defocus processing that focuses only on a predetermined position in the depth direction of the image displayed on the screen and blurs the front or rear side thereof. Note that the example in FIG. 3 has the advantage that the circuit configuration can be simplified compared to the example in FIG. 1.

Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments, and can take various configurations without departing from the gist of the present invention.

[0028]

As explained above, according to the image data processing apparatus of the present invention, the defocus data generation circuit can receive the supplied focus position data specifying the focus position in the depth direction and the focus position data specified by this focus position data. Defocus data is generated from tilt data that specifies the degree of blurring of the image toward the front and back of the focal position, and depth data attached to the input image data, and the defocus data generated in this way is Since the filter coefficient of the anti-aliasing filter is changed according to the data and the reduction ratio data of the input image data, the focus is only on a predetermined position in the depth direction of the image displayed on the screen. Alternatively, it is possible to generate image data for image conversion processing that has been subjected to defocus processing to blur the rear side.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of an image data processing device according to the present invention.

FIG. 2 is a characteristic diagram used to explain the operation of the image data processing device shown in FIG. 1;

FIG. 3 is a block diagram showing the configuration of another embodiment of the image data processing device according to the present invention.

FIG. 4 is a block diagram showing the configuration of an image conversion device related to a conventional technique.

FIG. 5 is a block diagram showing the configuration of the image conversion device shown in FIG. 4 with an anti-aliasing filter added thereto.

[Explanation of symbols]

5 Anti-aliasing filter 8 Filter coefficient generation circuit 9 Low pass filter 18 Defocus data generation circuit 21 Data mixing circuit S1 Input image data S2 Image data S3 Reduction rate data S4, S9 Defocus data S5 Depth data S6 Focus position data S7 Tilt data S8 Filter coefficient

Claims (1)

[Claims] 1. An image data processing device that converts supplied pixel-by-pixel input image data into image data for image conversion processing through an anti-aliasing filter, comprising:
Focal position data that specifies the focal position in the depth direction, tilt data that specifies the slope of the degree of blurring of the image toward the front and back of the focal position specified by this focal position data, and is attached to the above input image data. a defocus data generation circuit that is supplied with depth data to generate defocus data, and according to the defocus data of the defocus data generation circuit and the reduction ratio data of the input image data, An image data processing device characterized in that a filter coefficient of an aliasing filter is changed.