JP3288056B2 - Image storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image storage device.

[0002]

2. Description of the Related Art A memory for cyclically storing data in a storage area by connecting an end address of the storage area to a start address of the storage area or its address control is well known as a so-called ring memory. Image storage devices for storing image signals in a simple ring memory are already known.

[0003]

SUMMARY OF THE INVENTION In a ring memory,
Due to the address control, the information stored earlier cannot be protected from writing the next information. For example,
When a moving image is stored, a previously stored image is lost by the next image, and a temporally discontinuous image cannot be obtained.

[0004] An object of the present invention is to provide an image storage device that solves such a problem.

[0005]

According to the present invention, there is provided an image storage device, comprising: input means for inputting a moving image signal; a memory for storing the moving image signal input from the input means; and the moving image in the memory. Write control means for writing the moving image signal to the memory by cyclically specifying a write address of a signal; prohibiting means for prohibiting writing of the moving image signal to a partial area of the memory by the write control means; Wherein the writing control means comprises:
The write address is not written by the prohibiting means.
When reaching the forbidden the part of regions, characterized in that skipping an address of the part of the region, writing the moving image signal continuously over before and after the address of the address of the portion of the region And

[0006]

According to the above-mentioned means, while the image previously stored in the memory is stored, the subsequent image can be stored in another storage area. Thereby, a discontinuous image can be extracted from the moving image.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention applied to output processing of a video camera. 10 is a video camera, 12 is an A / D converter for digitizing a video signal output from the video camera 10, 14
Is a multiport random access memory for storing a digital video signal output from the A / D converter 12. In this embodiment, the memory 14 has a storage capacity capable of storing a video signal for several seconds to several tens of seconds.

Reference numeral 16 denotes a memory 14 according to a synchronizing signal superimposed on a video signal output from the video camera 10.
, A read address counter 18 for generating a read address of the memory 14, and 20 a D for converting video data read from the memory 14 into an analog signal.
The / A converter 22 is an output terminal.

Reference numeral 24 denotes a write address counter 1 according to a registered write-protected area of the memory 14.
6 and a memory management circuit for controlling the read address counter 18. The user sets and registers a write-protected area of the memory 14, that is, an arbitrary number of images to be stored, in the memory management circuit 24.

Next, the operation will be described. Video camera 1
The video signal output from 0 is digitized by the A / D converter 12 and written to the address indicated by the write address counter 16. The address of the write address counter 16 is incremented by a synchronization signal superimposed on the video signal. After reaching the end address of the memory 14, the write address counter 16 becomes the start address of the memory 14. Thereby, the memory 14 operates as a ring memory. FIG. 2 schematically shows the write address of the memory 14. The writing position is represented as a vector W rotating at an angular velocity ω.

There is a scene to be saved during shooting, and when this is written to the memory 14, the memory management circuit 2
4 is instructed to prohibit writing. At this time, an arbitrary size can be registered at an arbitrary storage position of the memory 14.

After the registration is completed, photographing is restarted. The write address counter 16 skips the write address for the storage area registered in the memory management circuit 24. For example, assuming that writing is prohibited in the range ab shown in FIG. 3, when the write vector W reaches the point a, it skips the area between a and b and then writes data to the point b. Thereby, the video data stored in the area between a and b is preserved.

Next, another embodiment applied to the processing of an n-times speed video signal will be described. FIG. 4 shows a block diagram of the configuration. The same components as those in FIG. 1 are denoted by the same reference numerals. 3
Reference numeral 0 denotes a video camera capable of shooting at a field frequency n times the standard television signal. The output video signal is output from an A / D converter 12, a write address counter 16, and a memory management circuit 24 as shown in FIG. As in the case of 1, the data is written to the memory 14. The slow reproduction control circuit 32 controls the read address counter 34 to
Data is read from the memory 14 at an arbitrary speed, and the read data is converted into a D / A conversion and format conversion circuit
To a standard television signal. This allows
An arbitrary slow video signal is output from the output terminal 38.

[0015]

As can be easily understood from the above description, according to the present invention, a discontinuous image can be extracted from a moving image.

[Brief description of the drawings]

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

FIG. 2 is an operation explanatory diagram of a memory 14;

FIG. 3 is an explanatory diagram of an operation when a write-protected area is provided in a memory 14.

FIG. 4 is a configuration block diagram of another embodiment.

[Explanation of symbols]

10: Video camera 12: A / D converter 14: Multi-port random access memory 16: Write address counter 18: Read address counter 20: D / A converter 22: Output terminal 30:
Video camera 32: Slow playback control circuit 34: Read address counter 36: D / A and format conversion circuit 38: Output terminal

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04N 5/907 H04N 5/92 G06F 12/02

Claims (1)

(57) [Claims] An input unit for inputting a moving image signal; a memory for storing the moving image signal input from the input unit; and a memory for cyclically designating a write address of the moving image signal in the memory. and write control means for writing the motion picture signal, and a prohibition means for prohibiting the writing of the moving image signal for some areas of the memory by said write control means, said write control means, the write address is Said
In the part of the area where writing is prohibited by the prohibiting means,
If reached, skipping an address of the part of the region, cotton before and after the address of the address of the portion of the region
Continuously I image storage device and writes the moving picture signal.