JPH0638642B2 - Video composition method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to, for example, remote sensing image processing.
The present invention relates to the field of video signal processing, and more particularly, to a video composition technique for reconstructing a plurality of television video signals obtained by spatially dividing the same scene and capturing the same scene into a continuous large-screen video signal.

(Prior art) When reconstructing a continuous large screen from a plurality of images that are divided and imaged, conventionally, the geometrical characteristics and gradation characteristics of each image are made uniform, whether it is a still image or a moving image. Above, a method of connecting straight lines as boundaries has been used.

(Problems to be Solved by the Invention) As described above, a boundary line becomes conspicuous only by simply connecting a plurality of images with straight boundaries, and in order to eliminate this, the geometric characteristics between the respective images are eliminated. It is necessary to correct the tone characteristics and gradation characteristics quite accurately, and this correction also requires processing based on statistical processing over the entire composite video screen even in the case of still images, which results in a fairly complicated configuration. Not applicable.

In the case of connecting moving images, the so-called fade-out / fade-in method, which is applied to still images and connects while weighting within a certain area of each constituent image that includes a linear boundary that is slightly different from the above, has some effect. I'm giving
There is a difficulty in processing a moving image in terms of processing complexity and processing speed.

An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a video synthesizing method for obtaining a high quality composite video by making a boundary line or a boundary region visually inconspicuous by a relatively simple circuit configuration and processing. is there.

(Means for Solving the Problems) In order to achieve this object, a video synthesizing method of the present invention is a video synthesizing method in which a plurality of videos are sequentially switched and synthetically connected to obtain a continuous screen. By providing an overlap area at the adjacent boundary between each other and changing the position of the switching within the overlap area,
The feature is that synthetic connection is performed so that the boundary positions of the images to be connected are not linear.

Further, a preferred embodiment of the present invention is characterized in that a random number having no periodicity with respect to horizontal and vertical periods of the combined image is used for determining the switching position by the method.

Still another preferred embodiment of the present invention is characterized in that the position of the switching by the method is such that the integrals of the deviations from the center of the predetermined overlap region to both sides are substantially equal. And

(Example) The present invention will be described in detail below with reference to the accompanying drawings. Further, in the synthesizing of three or more screens or the synthesizing in the vertical direction, the operation of the boundary portion is the same as the case of synthesizing two video signals in the horizontal direction.

FIG. 1 shows a circuit configuration block diagram of a video synthesizing apparatus constructed according to the present invention. The video input signals a and b are input to the sync conversion circuits 1 and 2, respectively. Its output c,
d is switched by the switching signal f from the switching position setting circuit 4 in the video switching circuit 3 to obtain a composite video output e.
The control circuit 5 generates a sync signal and a clock signal and distributes them to the sync conversion circuits 1 and 2 and the switching position setting circuit 4.

FIG. 2 is a diagram for explaining the details of the switching position setting circuit 4. The boundary position data g is a fixed value that specifies the boundary position within the horizontal scanning period. The random number generation circuit 7 generates a random number according to the specified conditions and outputs the random number data h. The boundary position data g and the random number data h are added by the adder circuit 8, and the output data i is compared with the horizontal address signal j indicating the position within one horizontal scanning period by the coincidence circuit 9 and the switching signal f is output.

In the video processing system having no scanning mechanism, the coincidence circuit 9 is unnecessary, and the output data i of the adder circuit 8 is used as it is.

FIG. 3 is a diagram for explaining the timing of signals in the first illustrated embodiment.

The outputs c and d of the synchronous conversion circuits 1 and 2 are arranged such that the video signal period has an overlap time td in the first half and the second half of one horizontal scanning period. In the example of FIG. 3, the boundary position data g is given a value indicating the center of one horizontal scanning period, and the random number data h is given a condition that the absolute value is equal to or less than | 1 / 2tw | (where tw <td). As an example, 1 of the composite video screen
If the total number of horizontal samplings is 500, the boundary position data g is 250, and if the overlapping area is 10, the left screen has numbers 1 to 255 and the right screen has numbers 245 to 50.
Number 0 is taken. Therefore, the random number in the boundary area is selected from the integers from area -4 to +4.

The signal f _{1 in} FIG. 3 is an example of the switching signal, and indicates that the switching signal is output at time t _{1 according} to the random number data.
The output e _{1 in} the figure shows a mode of the composite video output e when the switching signal f ₁ is used.

In FIG. 1, the video switching circuit 3 may be a circuit for performing weighting according to the position in the boundary area and performing composition, that is, a composition for performing switching composition with a so-called fade-out / fade-in characteristic. Of course, at this time, the center positions of fade-out and fade-in are biased by random numbers. The signal f _{2 in} FIG. 3 is an example of the switching signal f in that case, and shows that its center is biased at time t ₂ . The output e ₂ is a form of the corresponding composite video output e.

In the above-described embodiment, an example in which the deviation of the switching time or position from the central time or position is taken as a random number has been described, but as another embodiment, this deviation can be changed relatively regularly within the boundary region. Then, at this time, a condition is added that the integrals of the respective deviations from the boundary center to both sides are taken to be substantially equal for each full screen or half screen. In any case, in the present invention, the composition boundary position is constantly changing.

(Effect of the Invention) By using the device of the present invention, it is possible to connect a plurality of input video signals and obtain a continuous composite video screen with visually inconspicuous seams relatively easily. It is possible to simplify precise correction of geometrical characteristics and gradation characteristics between composite images.

[Brief description of drawings]

FIG. 1 is a circuit configuration block diagram of an embodiment of a video synthesizing apparatus constructed according to the present invention. FIG. 2 is a circuit configuration block diagram showing the switching position setting circuit shown in FIG. 1 in more detail. FIG. 3 is a diagram showing the timing of each signal in FIGS. 1 and 2. 1, 2 ... Synchronous conversion circuit, 3 ... Video switching circuit 4 ... Switching position setting circuit, 5 ... Control circuit 7 ... Random number generation circuit, 8 ... Adder 9 ... Matching circuit

Claims (3)

[Claims] 1. A video synthesizing method for sequentially switching a plurality of videos and synthesizing and connecting them to obtain a continuous screen, wherein an overlap region is provided at an adjacent boundary between the videos to be synthetically connected, and the switching position is set. A video synthesizing method, characterized in that the synthesizing and connecting are performed so that the boundary positions of the video images to be connected do not become linear by changing within the overlap region. 2. The video according to claim 1, wherein a random number having no periodicity with respect to horizontal and vertical periods of the combined image is used for determining the switching position by the method. Synthesis method. 3. The position of the switching according to the method is such that the integrals of the deviations from the center of the predetermined overlap region to both sides are substantially equal to each other. The video compositing method described in the item.