JPH02174472A - Two-dimensional picture synthesis circuit - Google Patents

Abstract

PURPOSE:To improve the picture quality of picture synthesis by synthesizing the picture in the lateral direction and using a memory to invert the longitudinal and lateral arrangement of the picture. CONSTITUTION:A picture resulted from 1-dimensional synthesis and an input signal are stored in memories 8-10, and the stored data are read from the memories so that the longitudinal and lateral directions of the original picture are reversed by using a control signal generated by a control circuit 11. Then the picture in the longitudinal direction is synthesized by multipliers 12, 13, an adder 14 and a subtractor 15. Then the relation of the longitudinal direction and the lateral direction of the picture is restored by a memory 16 and the result is outputted to an output terminal 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to television signal processing, and in particular to the processing of digital image signals.

[Prior Art] Conventionally, this type of image synthesis circuit has been configured to combine video input 1 and video input 2 into multipliers 3 and 2 using key input, as shown in FIG.
After multiplying by 4 and then combining by adder 7, it was a one-dimensional process.

[Problems to be Solved by the Invention] The conventional image synthesis circuit described above performs one-dimensional processing, so when manually synthesizing images with a two-dimensional distribution, the image quality on the diagonal boundary line may be affected. There was a problem.

[Means for Solving the Problems] A two-dimensional image synthesis circuit according to the present invention is an image synthesis circuit that synthesizes two types of images in a one-dimensional area using an arbitrary key signal. means A for accumulating one frame; means B for accumulating one frame of a pre-combined image corresponding to a key signal; means C for accumulating one frame of a key signal; The means A, such that the relationship between the vertical direction and the horizontal direction is reversed;
means for controlling B and C; means E for synthesizing the output of the means A and the output of the means B using the output of the means C; and storing one frame of the image synthesized by the means E. means F.

[Example code] Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

Video signal 1 and video signal 2 are input to multipliers 3 and 4 from input terminal 1 and input terminal 2, respectively, and gain-controlled by a key signal and subtractor 6, which are manually input from input terminal 5, and as a result, an adder is input. 7 and are added and synthesized. Since these processes are one-dimensional processes, there is a problem in image quality when the key signal has a two-dimensional distribution. Therefore, in this embodiment, the image resulting from the one-dimensional synthesis, the input signal 1, and the key signal are stored in the memory 8. 9. 10, and the accumulation result is read out from the memory in accordance with a control signal generated by a control circuit 11 so that the vertical and horizontal directions of the original image are reversed. After that, a multiplier 12゜13 and an adder 14
And the subtractor 15 performs vertical synthesis of the images. Thereafter, the memory 16 restores the relationship between the vertical and horizontal directions of the image and outputs it to the output terminal 17. In this embodiment, means A to C are constituted by memories 8 to 10, and means A to C are constituted by a control circuit 11. Further, the means E is composed of multipliers 12 and 13, an adder 14, and a subtracter 15,
The means F consists of a memory 16.

[Effects of the Invention] As explained above, the present invention synthesizes images in the horizontal direction and then reverses the vertical and horizontal directions of the images using memory, thereby also synthesizing images in the vertical direction. This has the effect of improving the image quality of image synthesis using key signals having a similar distribution.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention. 1, 2. 5... Input terminal, 3.4... Multiplier, 6... Subtractor, 7... Adder, 8 , 9. 10. 16... Memo "811.
...... Control circuit, 12.13... Multiplier, 14... ... Adder, 15...
・・・・・・・・・Subtractor, 17・・・・・・・・・Output terminal. FIG. 2 is a block diagram of an example of a conventional circuit. 1, 2. 5... Input terminal, 3.4...
・・・・・・Multiplier, 6・ ・ ・ ・・・・・・・・・Subtractor, 7...
・・・・・・・・・Adder, 8・・・・・・・・・・・・Output terminal. Patent Applicant: NEC Corporation Representative, Patent Attorney: Kiyoshi Kuwai −

Claims (1)

[Claims] In an image synthesis circuit that synthesizes two types of images in a one-dimensional area using an arbitrary key signal, the image after one-dimensional synthesis is
means A for accumulating frames; means B for accumulating one frame of a pre-combined image corresponding to a key signal; means C for accumulating one frame of a key signal; means D for controlling said means A, B, and C so that the relationship in direction and lateral direction is reversed; and means for synthesizing the output of said means A and the output of said means B using the output of said means C; E and the image synthesized by the means E as 1
A two-dimensional image synthesis circuit comprising: means F for accumulating frames.