JPH05328220A - Superimposing method - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a superimpose method that reliably avoids overlapping superimposes. [Structure] When superimposing the transmitted video signal, the luminance signal is separated from the incoming video signal (1), this signal is converted to a digital binary image signal (3), and the in-screen inspection is performed. By specifying the area and checking the number of edges of the image in that area (2, 5), the presence or absence of an existing supermarket is determined, and it is automatically determined whether or not a new supermarket should be imposed on the transmitted video signal. It is configured so that a judgment (2, 6, 7) can be made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to superimposing images, and more particularly to a superimposing method for avoiding overlapping of superimposing.

[0002]

2. Description of the Related Art Conventionally, when a character or the like is superimposed on a transmitted image, a system for electrically determining whether or not the super is already superimposed on the rectangular area of the screen to be superimposed is known. There was no particular existence, and humans visually judged the image.

[0003]

At the broadcasting site, especially at a local station, a weather mark of a local weather forecast is often superimposed on a part of a nationwide relay screen as one of local services. In addition, even at the central station, there are many cases where the telop of an earthquake or an incident is already superimposed on the screen and sent out as a whole program. Thus, the superimpose was often duplicated and the screen was difficult to see.

In order to avoid this, the sending operator of the local station must monitor the whole screen before superimposing for the local station, or must monitor the screen at all times during superimposing. It was Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks so that the transmitting operator of the local station does not have to monitor the entire screen prior to the local superimposing, and the screen can be displayed during the local superimposing. The objective is to provide a superimpose method that can be electrically controlled automatically without the need for supervision and that can eliminate the overlap of superimpose.

[0005]

In order to achieve this object, the superimposing method of the present invention separates a luminance signal from an incoming video signal to perform a superimposing on the transmitted video signal. Convert the generated luminance signal into a digital binary image signal, specify the area to be inspected to be superimposed on the screen, and determine the presence or absence of an existing super by checking the number of edges of the image in the specified area. , If it is determined that the supermarket has been imposed, then stopping the superimposing of a new supermarket on the transmitted video signal is stopped. It is characterized by comprising sequential steps for imposing. Furthermore, in a preferred embodiment of the present invention, said sequential steps are a) Y / C from the incoming video signal.
The separation circuit separates the luminance signal, b) the separated luminance signal is converted into a digital binary image signal by a 1-bit A / D converter, and the converted digital binary image signal is temporarily stored in the graphic video RAM. , C) Designate a rectangular area to be superimposed on the screen, extract the digital binary image area under investigation corresponding to this rectangular area from the temporarily stored video RAM, store it in the main memory, and d )
The numbers corresponding to the edges of the image of the region to be examined are calculated as the total number of rows and the total number of columns, and it is determined whether or not these numbers exceed a preset first threshold value. In the survey area, the arrangement of the edges of the current frame and the arrangement of the edges one frame before are compared, and the first ratio of the number of row stationary edges to the total number of edges of the current frame and the column to the total number of columns of the current frame The second ratio of the number of stationary edges is calculated, and it is determined whether or not each exceeds a preset second threshold. F) Arrangement of edges two frames before and one frame before in the region to be examined. And the sequence of edges of the current frame are compared, and the third ratio of the number of row stationary edges to the total number of row edges of the current frame and the fourth ratio of the number of column stationary edges to the total number of column edges of the current frame are compared. Calculate percentage Then, it is determined whether or not each exceeds a preset third threshold, and g) the total number of row edges and the total number of column edges of the current frame in the region under investigation exceed the first threshold value, respectively, and If the first ratio and the second ratio each exceed the second threshold value, and the third ratio and the fourth ratio each exceed the third threshold value, the transmission is performed. It is determined that a supermarket has already been imposed in the area under investigation of the video signal that has been received, and a new supermarket is stopped to be imposed. It is characterized by having.

Further, according to the superimposing method of the present invention, once the imposing of the new supermarket is stopped, thereafter, the third ratio and the fourth ratio are investigated, and the third ratio is checked. When the ratio and the fourth ratio do not exceed the preset fourth threshold value,
It is characterized by starting a new superimpose.

[0007]

The present invention will be described in more detail with reference to the accompanying drawings as follows. FIG. 1 shows a schematic block diagram for achieving the method of the present invention. The video of the all-time broadcast program is input from the all-time video signal input. A part of the input video signal is guided to the Y / C separation circuit 1 and only the luminance signal Y is extracted. Next, the extracted Y signal is converted by the 1-bit A / D converter 3 into a 1-bit or binary digital image signal in response to a command from the CPU 2. The binary digital image signal is a signal of white or black. Here, the white signal is "1" and the black signal is "0". That is, the input video luminance signal is white or black, that is, "1" or "0" according to a preset threshold value.
Be distributed to.

This distributed binary image is a graphic video RAM (GVRAM) 4 for one frame at a time by an instruction of the CPU 2.
Memorized in. Next, we are investigating whether or not there are already superimposed signals in the predetermined areas of the screen to be superimposed, but first we have to specify the area to be investigated. However, this is already set in the CPU2 in advance, and is generally a rectangular area, but the storage part of the temporarily stored video RAM corresponding to this is extracted from the video RAM and this is stored in the main memory 5 Remember.

The area to be investigated is, for example, 320 dots wide,
A binary image of 220 dots vertically has 56 dots horizontally and 26 dots vertically, and its position is fixed as the upper right corner of the screen, with the 17th dot from the top side and the 250th dot from the left side as its start dots, and its size and position. Only the portion corresponding to the surveyed area is read from the GVRAM 4 and stored again in the main memory 5.

In the superimposed area, the luminance signal changes abruptly, that is, in the above-mentioned binary digital image signal, there are many portions which change from "1" to "0" and from "0" to "1". The position of this changing part does not change over several frames, that is, it is a still image. This research method pays attention to this point, and there is also this abrupt change part in the general video signal, and this is called the edge part of the image, but there are many moving images in the normal television signal. The following explanation of the investigation method will proceed, noting that the position of the edge portion is usually not fixed.

In the dot pattern of the investigation area of the main memory, "0" and "1" are in contact with each other, such as "0,1" and "1,0" in the arrangement of 0 and 1. You can count how many parts there are. This is scanned in the horizontal direction and in the vertical direction and counted respectively, and these become the number of horizontal scanning rows total edges and the number of vertical scanning columns total edges, respectively, and the threshold value (first threshold value) of two total edges is set to, for example, The number is set to 40, and it is determined whether or not both exceed this threshold value.

Next, in the dot pattern of the area to be inspected in the main memory, the portion where "0,1" or "1,0" is arranged is set as 1, the other portion is set as 0, and a new edge An edge pattern indicating a certain position is created, but a horizontal scan row edge pattern created by scanning in the horizontal direction and a vertical scan column edge pattern created by scanning in the vertical direction can be created. The row edge pattern and the column edge pattern thus created are recorded in the main memory one frame before and two frames before. Then, first, the row edge pattern of the current frame is compared with the row edge pattern one frame before, and the state of the bit at the same position of the two edge patterns is checked. Only when both patterns are 1 are counted as row coincident edges. .. Then, the column edge pattern of the current frame and 1
The column edge pattern before the frame is compared, the state of the bit at the same position of the two edge patterns is checked, and only when both patterns are 1 is taught as a column coincident edge. Then, the ratio of the number of row matching edges to the total number of edges of the current frame (first ratio) and the ratio of the number of column matching edges to the total number of column edges of the current frame (second ratio) are respectively set. It is calculated as a percentage, and the threshold value (second threshold value) is set to 60%, and it is determined whether or not each ratio exceeds this 60%.

Further, the edge pattern two frames before, the edge pattern one frame before, and the edge pattern of the current frame are compared, and when the bit at the same position in the row edge pattern is 1 in all three patterns, the row is detected. It is counted as a coincident edge, and when the bit at the same position in the column edge pattern is 1 in all three patterns, it is counted as a column coincident edge. (Third ratio) and the ratio of the number of column matching edges to the total number of column edges of the current frame (fourth ratio) are calculated in percent, and the threshold value (third threshold value) is set to 40%. It is determined whether each percentage exceeds this 40%.

The total number of row edges and the total number of column edges each exceed 40, the first ratio and the second ratio each exceed 60%, and the third ratio and the fourth ratio. However, when each exceeds 40%, it is determined that the super is already imposed in the area under investigation of the transmitted video signal, and the relay driving circuit 6 drives the relay to drive the superimposing circuit 7. Stop working.

Further, once it is determined that there is a supermarket, the third ratio and the fourth ratio are checked, and a threshold value (fourth
Threshold value) is set to 20%, and when each does not exceed this threshold value, it is determined that there is no super, and the relay is driven to operate the superimposing circuit 7. Furthermore, after it is judged that there is no super in the input video signal, the national broadcast (all-in-one) video signal is repeatedly taken in and the above-mentioned investigation is continued.

Although one embodiment of the method of the present invention has been described in detail above, it is obvious that the present invention is not limited to this and various changes and modifications can be made within the scope of the present invention. .. For example, how to set the value of each threshold is an example.

[0017]

As is apparent from the above detailed description, by implementing the method of the present invention, the character super to be superimposed at the local station and the all-round video signal have been transmitted. There is an advantage that a locally transmitted video signal having a superimposable and accurate superimposition can be obtained without overlapping the superposed superimposing already existing in the video signal to be superimposed. Also, the work amount of the superimpose operator is greatly reduced at the local broadcasting site, and the broadcasting efficiency is significantly improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment for achieving a method of the present invention.

[Explanation of symbols]

 1 Y / C separation circuit 2 CPU 3 1-bit A / D converter 4 Graphic video RAM 5 Main memory 6 Relay drive circuit 7 Superimpose circuit

Claims (4)

[Claims] 1. When performing superimposing on a transmitted video signal, a luminance signal is separated from an incoming video signal, the separated luminance signal is converted into a digital binary image signal, and superimposing on a screen is performed. The existence of an existing supermarket is determined by specifying the area to be inspected and checking the number of edges in the image of the specified area. If it is determined that the supermarket is imposed, it is transmitted. A supermarket characterized by comprising sequential steps for stopping the imposition of a new supermarket on the video signal and for imposing a new supermarket when it is determined that the supermarket has not been imposed. Imposing method. 2. The method according to claim 1, wherein the sequential steps are: a) separating a luminance signal from an incoming video signal by a Y / C separation circuit, and b) separating the separated luminance signal by 1 bit A / D. Converted to a digital binary image signal by a converter, temporarily store the converted digital binary image signal in a graphic video RAM, and c) specify a rectangular area to be superimposed on the screen, and store the temporary stored image. The digital binary image area under investigation corresponding to this rectangular area is extracted from the video RAM and stored in the main memory, and d) the number corresponding to the edges of the image in the above-mentioned area under investigation It is calculated as the number of edges, and it is determined whether or not those numbers exceed a preset first threshold value. E) Compare the arrangement of the edges of the current frame with the arrangement of the edges one frame before in the area under investigation. The current frame Whether the first ratio of the number of row stationary edges to the total number of row edges and the second ratio of the number of column still edges to the total number of column edges of the current frame are exceeded, and whether or not they respectively exceed preset second threshold values. F), the edge sequence two frames before in the area under investigation and 1
The edge sequence before the frame is compared with the edge sequence of the current frame, and the third ratio of the number of row stationary edges to the total number of row edges of the current frame and the number of column stationary edges to the total number of column edges of the current frame are compared. To determine whether each exceeds a preset third threshold, and g) the total number of row edges and the total number of column edges of the current frame in the region under investigation are respectively determined as described above. The first threshold is exceeded, and the first
And the second ratio exceed the second threshold value, and the third ratio and the fourth ratio exceed the third threshold value, respectively. It is determined that a supermarket has already been imposed in the area under investigation of the video signal, stopping the superimposing of a new supermarket, and otherwise imposing a new supermarket. Superimposing method characterized by. 3. The method according to claim 2, wherein once the imposing of the new supermarket is stopped, then the third ratio and the fourth ratio are investigated, and the third ratio is checked. A superimposing method characterized in that a new superimposing is started when the ratio and the fourth ratio do not exceed the respectively preset fourth threshold values. 4. The method according to claim 1, wherein the digital binary image signal is “1” or “0”.
The superimposing method is characterized in that the edges of the image are displayed as "1,0" and "0,1" when displayed in <1>.