JP2004207884A - Method of tracking/photographing object restraining it from getting out of frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein it takes time excessively to exchange commands or operate a pan-tilt camera at its operational speed, so that an object can not be followed with the camera and gets out of a frame, or a positional adjustment difference between a sensor camera and the mechanical pan-tilt camera is enlarged when the zoom magnification of the camera is increased, so that the object is liable to get out of a frame when the object is tracked and photographed with the mechanical pan-tilt camera. <P>SOLUTION: The object is displayed on a wide image plane using a high-pixel camera 1, the signals of video photographed by the camera 1 are inputted into a two-port memory 2, write address signals generated on the basis of the video signals are inputted into the two-port memory 2. Furthermore, the video signals that constitute a frame and are stored in the two-port memory 2 are cut out and displayed on a monitor 3 through the intermediary of a movement detecting means 5, a representative point extracting means 6, and a cutout display control means 7. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tracking shooting method for detecting the position of a tracking target that moves around and continuously acquiring images that do not go out of frame.
[0002]
[Prior Art and Problems to be Solved by the Invention]
When tracking and shooting with a conventional mechanical pan-tilt camera, it takes too much time to exchange commands (communication) and the response (movement) of the camera, and it is not possible to follow the movement of the subject, and the subject may go out of frame. there were.
In addition, in the conventional camera configuration, even when zooming (photographing a distant place), the error of the position adjustment between the sensor camera and the mechanical pan / tilt camera is increased when the zoom magnification is increased, and the subject is easily out of the frame. .
[0003]
[Unpublished patent application 1]
Japanese Patent Application 2002-333163
[0004]
FIG. 3 shows an example of a tracking photographing method using a conventional mechanical pan-tilt camera.
In FIG. 3A, a video signal obtained by photographing a tracking target object is input to a motion detection unit 102 by a sensor camera 101 to detect a motion.
The position of the x-coordinate and y-coordinate of the extracted image and the size of the image data are obtained from the video whose motion has been detected via the representative point extracting means 103 and input to the camera control means 104. The pan command, the tilt command, and the zoom command are output to the pan / tilt camera 105.
After inputting the three commands, the panchile camera 105 sends the video of the tracking target to the monitor 106, and displays the tracking video on the monitor 106.
[0005]
FIG. 3B shows a sensor camera image 107 by the sensor camera 101 and a panchile camera image (tracking image) 108 by the panchile camera 105.
The tracking object 109 is photographed by the sensor camera 101, and a tracking image is photographed by the pan-tilt camera 105.
At this time, the representative point 110 determined by the pan command, the tilt command, and the zoom command exists in the central portion of the pan-til camera image 108 from the pan-til camera 105.
[0006]
FIG. 5A shows a situation in which the subject goes out of the frame due to a positional shift generated between the movement of the subject and the pan control of the camera.
FIG. 5B shows a situation in which the error of the position adjustment between the conventional sensor camera 101 and the mechanical pan-tilt camera 105 increases when the zoom magnification is increased, and the subject is easily zoomed out. .
[0007]
[Means for Solving the Problems]
By continuously clipping and displaying a moving subject using a wide-area image captured by a high-pixel camera, a tracking image that does not go out of frame can be obtained without being affected by a delay (reaction speed) or a position adjustment error.
FIG. 4 shows an example in which an image of a moving subject in a wide area image is cut out and displayed.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a tracking shooting method without frame out according to the present invention.
[0009]
In FIG. 1, a video signal obtained by capturing an image of a tracking target moving around by a high pixel camera 1 is input to a two-port memory 2, and a write address for generating a write address signal using a synchronization signal detected from the video signal. A write signal is input from the generation unit 4 to the two-port memory 2.
[0010]
Next, the video signal is input to the motion detecting means 5, the motion of the tracking target is detected from the frame difference of the video signal, and the representative point extracting means 6 calculates the circumscribed rectangle from the motion detection result. The center of gravity of the cutout is set at the center of gravity of the circumscribed rectangle, and the ordinate of the cutout is set at an origin at a position 10 pixels away from the upper side of the circumscribed rectangle, XL pixels in the horizontal direction and YL pixels in the vertical direction. Is cut out around the tracking target.
Although the distance between the upper side of the circumscribed rectangle and the origin is set to 10 pixels, it can be set arbitrarily.
[0011]
From the representative point extracting means 6, the components of the cutout area consisting of x, y, XL and YL are sent to the cutout display control means 7.
The two-port memory 2 is constructed so that reading and writing can be performed at the same time apparently, and stores the image captured by the high pixel camera 1 for one frame by the read signal.
The cut-out display control means 7 generates a read address signal and inputs it to the two-port memory 2, and displays on the monitor 3 an area where the video stored in the two-port memory is cut out by a write signal.
[0012]
FIG. 2A shows the relationship between the image data stored in the two-port memory and the cut-out display portion (tracking image).
FIG. 2B is an explanatory diagram of representative point extraction, in which 22 is a tracking target, 21 is a circumscribed rectangle, and 23 is a center of gravity position.
[0013]
【The invention's effect】
As described above, according to the tracking shooting method without frame out according to the present invention, a moving subject is displayed on a wide-area image, and the subject is cut out and displayed continuously, so that it is not affected by a reaction speed or a position adjustment error. A tracking image without frame out is obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a tracking shooting method without frame out according to the present invention.
FIG. 2A is a display example of data in a two-port memory in a tracking image captured according to the present invention.
(b) is an explanatory diagram of representative point extraction.
FIG. 3A is an example of a tracking photographing method using a mechanical pan-tilt camera according to the related art.
(b) is an explanatory view of a sensor camera image and a panchile camera image (tracking image).
FIG. 4 is an explanatory diagram of a cutout display portion displayed by a wide area image.
FIG. 5 shows an example in which a frame is out of a photographing unit according to the related art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 High pixel camera 2 2-port memory 3 Monitor 4 Write address generation means 5 Motion detection means 6 Representative point extraction means 7 Cutout display control means

Claims (1)

Means for inputting a video signal photographed by a high-pixel camera to a two-port memory;
Means for detecting a synchronization signal from the video signal, generating a write address signal, and inputting the write address signal to a two-port memory;
Motion detection means for detecting the motion of the tracking target from the frame difference of the video signal,
From the motion detection result, the circumscribed rectangle of the tracking target object and its center of gravity are calculated, and the abscissa is set at the center of gravity of the circumscribed rectangle at the center, and the ordinate is set as the origin at a position 10 pixels away from the upper side of the circumscribed rectangle. Means for obtaining an area to be cut out around the tracking target object, comprising XL pixels and YL pixels in the vertical direction;
Means for inputting the constituent elements (x, y, XL, YL) of the cut-out area extracted from the means for obtaining the cut-out area to the cut-out display control means, generating a read address signal and inputting the read address signal to the two-port memory; ,
A two-port memory constructed so that writing and reading are apparently executed at the same time is stored in the two-port memory, the one-frame image captured by the high-pixel camera using the write signal, and the read signal is read from the stored image. A tracking shooting method without frame out, characterized by displaying an area cut out by (1) on a monitor.

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