JPH02198280A - Method of synthesizing title - Google Patents

Abstract

PURPOSE:To make it unnecessary to previously synthesize a title picture by outputting a title picture signal when the signal level of the title picture is within a prescribed range and outputting a picture signal stored in a memory when the above-mentioned signal level is out of the above-mentioned prescribed range. CONSTITUTION:Picture data, with which a title is to be synthesized, are digitized in an A/D converter 5 and stored in a printed picture memory 7. Boundary values A and B of the luminance signal level of the title picture are read with latches 1 and 2 by a software, etc. The data of the title picture are inputted, digitized in the converter 5, and taken in, a signal level C is compared with the boundary values A and B in comparators 3 and 4, and the switching of a picture switching circuit 8 is controlled by a discriminating signal obtained by the comparison. As the result, while the title picture is selected when the signal level of the title picture is within the range between the boundary values A and B, a memory picture is selected when the above-mentioned signal level is out of the above-mentioned range.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a title synthesis method that allows title synthesis to be performed on any image without using a special title memory.

[Conventional technology]

A video printer is equipped with a print image memory, and after image data (frame data) arriving from a video device is temporarily stored in this memory, printing is performed while sequentially reading it out.

[Problem to be solved by the invention]

In the past, when performing title compositing on such a video printer, it was necessary to prepare a special memory to store the title image, or to store the image data after title compositing in the print image memory. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a title synthesis method that does not require title image synthesis to be performed in advance and also eliminates the need to prepare a title image memory.

[Means to solve the problem]

For this purpose, the first invention stores images to be combined with a title in advance in a memory, then manually inputs the title image, and when the signal level of the title image is within a predetermined range, the title image signal is When the image signal is outside the range, the image signal stored in the memory is output.

In the second invention, an image to be combined with a title is stored in a memory in advance, and then the title image is input, and when the signal level of the title image is within a predetermined range, the part of the image in the memory is I changed it to the title image.

〔Example〕

Examples of the present invention will be described below. In this embodiment, first, in each RGB signal, two boundary values A are set between the luminance signal level θ and 100%, as shown in FIG.
, B are arbitrarily set to determine whether the brightness level C of the input image signal is inside or outside these boundary values A and B, that is, B<C<A...Middle C<B...Outside Arc...・Distinguish outside.

FIG. 1 is a circuit diagram for performing title synthesis. Although only the luminance data of one color is shown here, in reality, each color of RGB is processed in the same way.

1.2 is a latch that temporarily stores the boundary values A and B mentioned above, and 3.4 is a latch that compares the boundary values A and B with the brightness C of the input image data digitized by the A/D converter 5. comparator,
6 is an AND gate which performs the logical product of the output logics of both comparators 3 and 4. The discrimination signal obtained from this AND gate 6 is as follows: B<C<A...'IJ CAB...'0'Arc...'OJ.

7 is a print image memory, in which an image to be printed is temporarily stored. 8 is an image switching circuit that selects either the input image data from the A/D converter 5 or the memory image data from the memory 7, and when the discrimination signal obtained from the AND gate 6 is "1", the input image data is selected. Also, when it is "0", memory image data is selected and output from the D/A converter 9.

Reference numeral 10 denotes a memory write inhibit circuit, which inhibits writing to the memory 7 when the determination signal from the AND gate 6 is 'OJ'. Reference numeral 11 denotes a control circuit that controls writing/reading of the memory 7.

Now, real-time title synthesis is performed in the following order.

■The image data to be combined with the title is transferred to the A/D converter 5.
The image is digitized and stored in the print image memory 7. ■
, the boundary values A and B of the luminance signal level of the title image are read into the latch 1.2 by software, a dedicated circuit, or the like. ■Input the data of the title image, digitize it and import it with the A/D converter 5, compare the signal level C with the boundary value A1B in the comparator 3.4 in real time, and switch the image based on the obtained discrimination signal. The circuit 8 is switched and controlled. During this time, the image data in the memory 7 is sequentially read out in synchronization with the input title image data.

As a result, when the signal level of the title image is within the boundary values A and H, the title image is selected, and when it is outside the boundary values, the memory image is selected.

FIG. 3 is a diagram showing this title composition. (The image shown in al is stored in the memory 7, and then (bl
By manually selecting the title image shown in (C) in the image switching circuit 8, a title-composed image as shown in (C) is obtained and displayed on the monitor.

Title synthesis can also be performed in the memory 7 separately from the above processing. In this case, if the write inhibit circuit 10 prohibits rewriting of the memory 7 except when the signal level of the input title image is within the boundary values A and B, the previously written image can be Only the title image portion is newly rewritten, and title synthesis is performed in this memory 7.

When printing, an image with a title combined in this memory 7 can be printed.

As described above, since the circuit shown in FIG. 1 is provided for each RGB signal, boundary value levels can be set for each 4° of RGB, and color removal can be performed in any wide or narrow range.

〔Effect of the invention〕

As described above, the present invention has the advantageous feature that no special memory is required, and there is no need to manually generate image data with titles synthesized in advance for printing.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram for title synthesis according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of boundary values, and FIG. 3 is an explanatory diagram of title synthesis. Agent Patent Attorney Tsuneaki Nagao 1st

Claims (2)

[Claims] (1) The image to be combined with the title is stored in memory in advance, and then the title image is input, and when the signal level of the title image is within a predetermined range, the title image signal is output, and A title synthesis method characterized in that the image signal stored in the memory is output when the image signal is outside. (2) The image to be combined with the title is stored in memory in advance, and then the title image is input, and when the signal level of the title image is within a predetermined range, the part of the image in the memory is converted into the title image. A title composition method characterized by rewriting the title to .