JPH10200883A - Monitor display device for subject - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the monitor display device for a subject which enables a supervisor to easily recognize and monitor the subject on the screen of the monitor display device. SOLUTION: A scene of a subject to be monitored is inputted as an image signal by an image input part 1, and then corrected by an image input control part 2. Then the image signal processing part 3 separates the subject included in the image signal and the background of the subject or an obstacle, and the subject separated by the image signal processing part 3 is made conspicuous and displayed on the display screen of a display part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an object monitoring and display apparatus for displaying objects such as railway stations, railroad crossings, and passenger facilities at airports on a display screen and visually confirming safety.

[0002]

2. Description of the Related Art For example, a monitoring monitor is set at a railway station or at a passenger facility at an airport to visually confirm safety, thereby helping to prevent crime and prevent accidents. In such a monitoring monitor, a subject to be monitored is imaged and displayed on a screen for monitoring.

In this case, the observer looks at the screen on which the scene captured by the surveillance camera is actually reproduced and displayed, and searches and pursues a subject to be confirmed. That is, a subject to be monitored is selected in consideration of the background displayed on the display screen and obstacles located in front of the background, and monitoring and safety confirmation are performed.

[0004] As described above, the subject to be monitored is selected from the scenes that are actually displayed on the surveillance camera by taking into account the background and foreground by human labor.

[0005]

However, in such a monitoring display device, it may be difficult to easily identify the subject depending on the background of the display screen, and it may not be possible to confirm it immediately. That is, the size, shape, location, surrounding environment, peripheral equipment, sunlight, lighting equipment incident light,
Due to various conditions such as the conditions of reflected light, the subject to be monitored may be buried in the background and difficult to see in the captured image, and the subject may not be visible due to obstacles located in front of the subject. It may be difficult.

As described above, when the background of a subject to be monitored is complicated, or when there is a linear obstacle such as a fence or an electric wire in the foreground of the subject, it is difficult to identify the subject. However, there is a problem in that it takes a lot of effort to gaze at the subject, which is a mental burden.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a monitoring and displaying apparatus for a subject which enables a monitor to easily recognize and monitor the subject on a screen of the monitoring and displaying apparatus.

[0008]

According to a first aspect of the present invention, there is provided an image input unit for inputting a scene of a subject to be monitored as an image signal, and an image input unit for correcting the image signal input by the image input unit. An image input control unit, an image signal processing unit that separates a subject included in the image signal from a background or an obstacle of the subject, and a display unit that displays the subject separated by the image signal processing unit on a display screen. It is provided with.

According to the first aspect of the present invention, the scene of the subject to be monitored is input as an image signal by the image input unit, and the image signal input by the image input unit is corrected by the image input control unit. Then, the subject included in the image signal and the background or obstacle of the subject are separated by the image signal processing unit, and the subject separated by the image signal processing unit is displayed prominently on the display screen of the display unit.

According to a second aspect of the present invention, in the first aspect, the image signal processing section separates the subject and its background based on a phase difference between the subject and its background.

According to the second aspect of the present invention, in addition to the operation of the first aspect, the separation between the subject and the background is performed by the image signal processing unit based on the phase difference between the subject and the background.

According to a third aspect of the present invention, in the first aspect, the image signal processing section separates the subject and its background based on a hue difference between the subject and its background, and the background has a complementary color relationship with the subject. It is a certain hue.

According to a third aspect of the present invention, in addition to the operation of the first aspect, the separation between the subject and its background is performed by the image signal processing section based on the hue difference between the subject and its background. Is displayed on the display screen of the display unit in a hue having a complementary color relationship with the subject.

According to a fourth aspect of the present invention, in the first aspect, the image signal processing section separates the subject and its background based on a phase difference between the subject and its background, and the background has a complementary color relationship with the subject. It is a certain hue.

According to a fourth aspect of the present invention, in addition to the operation of the first aspect, the separation between the subject and the background is performed by the image signal processing unit based on the phase difference between the subject and the background. Is displayed on the display screen of the display unit in a hue having a complementary color relationship with the subject.

According to a fifth aspect of the present invention, in the first aspect, the image signal processing section separates the subject and its background based on a brightness difference between the subject and its background.

According to a fifth aspect of the present invention, in addition to the operation of the first aspect, the separation between the subject and its background is performed by the image signal processing unit based on the brightness difference between the subject and its background.

According to a sixth aspect of the present invention, the image signal processing section separates the subject from the background based on the brightness difference between the subject and the background, and the background has a hue having a complementary color relationship with the subject. Things.

According to the present invention, the subject and its background are separated by the image signal processing section based on the brightness difference between the subject and its background, and the background is displayed in a hue having a complementary color relationship with the subject. It is displayed on the display screen of the unit.

According to a seventh aspect of the present invention, in the first aspect, the image signal processing section separates the subject and its background based on a phase difference between the subject and an obstacle located in front of the subject. It was made.

According to the seventh aspect of the present invention, in addition to the operation of the first aspect of the present invention, the separation between the subject and the background is determined by the image signal processing section by the phase difference between the subject and an obstacle located in front of the subject. It is done based on.

[0022]

Embodiments of the present invention will be described below. FIG. 1 is a block diagram showing an embodiment of the present invention. The first embodiment is based on the NTSC system in which an RGB video signal is expressed and conveyed by a luminance signal Y and two color signals IQ signals, and is conveyed. 1 and an image input control unit 2 for correcting an image signal input by the image input unit 1
And an image signal processing unit 3 that separates a subject included in the image signal from a background or an obstacle of the subject, and a display unit 4 that displays the subject separated by the image signal processing unit 3 on a display screen. It is configured.

That is, a scene is captured from the image input unit 1 and input as an image signal. The input image signal is corrected as an image signal by the image input control unit 2, and after the background is arranged and the foreground obstacle is removed by the image signal processing unit 3, the image is output and displayed on the display unit 4 as an image display screen.

The image input unit 1 captures a scene to input an image and inputs the image as an image signal. Then, when photographing the scene, the distance to the subject in the scene is measured, and the subject and the background when the subject is focused are input as an image. That is, the sight is captured without focusing on the subject and focusing on the background.
For this reason, the subject is obtained as a clear image as a real image, while the background is obtained as a blurred virtual image because the subject is in focus.

The image input controller 2 performs various corrections on the input image signal. In other words, compensation for degradation of the frequency characteristics of the image signal, color temperature correction, contour compensation, color reproducibility correction, arithmetic processing in a matrix circuit, color unevenness correction around the image, compression of highlights, CRT gamma correction, output Perform amplification. Then, the image signal after the correction is output to the image signal processing unit 3.

When converting the image signal from the image input control unit 2 into digital data, the image signal processing unit 3 arranges the background and removes obstacles in the foreground. In the image signal, all subjects are real images and the background is a blurred image,
Since the output distribution of the image signal is different between the subject and the background, the subject and the background are identified based on the boundary. In other words, the subject and the background are separated by processing and organizing and removing the blurred portion, and only the subject is extracted from the entire scene.

FIG. 2 is a block diagram of the image input unit 1. In the image input unit 1, a scene including a subject to be monitored is photoelectrically converted by a photoelectric conversion unit 5, a signal converted into an electric signal is preamplified by a preamplifier 6, and further amplified by an image signal amplifying unit 7. To the image input control unit 2 via the cable 8.

When a scene is captured, the distance to the subject in the scene is measured, and the subject and the background when the subject is focused are input as an image. That is, the object is obtained as a clear image as a real image, and the background is obtained as a blurred virtual image because the object is in focus. The outline should be clear so that the subject and the background can be easily separated.

When the subject becomes dark at night or the like, the subject is illuminated with light using illumination or the like so that the outline of the background becomes clear. The captured scene is subjected to photoelectric conversion by the photoelectric conversion unit 5 and converted into an electric signal. Since the electric signal photoelectrically converted by the photoelectric conversion unit 5 is weak as it is, the image signal is amplified by the preamplifier 6 and the image signal amplifier 7 and then sent to the image input control unit 2 using the cable 8.

FIG. 3 is a block diagram of the image input control unit 2. The image input control unit 2 first removes noise induced in the image signal on the cable 8 by the cable compensation amplification unit 9 and compensates for frequency characteristic deterioration. Next, the color temperature correction amplification unit 10 is adapted to easily and appropriately reproduce color even when the color temperature is different, such as sunlight or artificial illumination light. Control channels.

The contour compensation amplification unit 11 increases the sharpness of an image and facilitates separation of a subject from a background. It is composed of horizontal and vertical aperture correction circuits, and outputs a delay signal equivalent to 100 ns in the case of horizontal and 63.5 μS in the case of vertical to enhance the contour. The linear matrix amplifier 12 is an amplifier circuit for correcting color reproducibility. In the case of the NTSC system, this improves the imaging characteristics. The shading correction unit 13 corrects color unevenness around the image, regulates white clip portions, shapes the image to a required video signal level, compresses the highlight portion of the image, and compresses the white portion to make the image easier to see. . Similarly, the compression unit 14 regulates a white peak portion of the image signal, shapes the image signal to a required video signal level, compresses a highlight portion of the image, and compresses the white portion to make the image easier to see. γ correction unit 15
Performs gamma correction of the cathode ray tube. The output amplifying unit 16 outputs the processed image signal to the image signal processing unit 3.

FIG. 4 is a block diagram of the image signal processing section 3. As shown in FIG. The image signal processing unit 3 includes: an AD conversion unit 17 that converts an image signal into digital data; an MPU unit 18 that performs software processing; a frame buffer unit 19 that stores display screen data; And an image output unit 20 for performing output control.

The image signal corrected by the image input control unit 2 is input to an image signal processing unit 3, where separation of a subject from a background and removal of obstacles in the foreground are performed. Removal of the background and foreground obstacles from the subject is performed by the MPU unit 18 when converting the image signal into digital data.

All subjects are real images and have clear image contrasts and boundaries, and the background is a blurred image with no contrast or boundaries, so that the subjects can determine the outline. The subject and the background are output with different output distributions due to the phase difference of the image signal when the beam scanning is performed. FIG. 5A shows a state in which the subject 21 in the screen is scanned by the scanning line s1, and FIG. 5B shows a portion of the scanning line s1 in which the boundary between the subject and the background is enlarged. Things.
In FIG. 5B, s2 is a subject signal, and s3 is a background signal. The processed image signal is sent to the display unit 4 and displayed.

For a change pattern of the output distribution of the image signal, another signal having a skirt characteristic cross-fade with respect to the object signal s2 is used for clarity, and this signal is used as a background signal s3. The signal output distribution of the subject is a repetition of the contour of the image and the light and dark due to the unevenness of the image. Therefore, the subject is separated from the background by processing, organizing, and removing the image signal from the difference in the change pattern of the signal output distribution, so that only the subject can be extracted from the entire scene.

When separating the subject from the background, if the background is arranged so that the phase is opposite to the color phase of the subject, the subject and the background have a complementary color relationship, and the subject can be clearly seen. If the background color and the subject color are almost limited, the hue of the subject and the hue of the background are measured, and the background and the subject are separated from the hue difference between the hue of the subject and the background. Is extracted from the screen, and the background is arranged in a hue having a complementary color relationship with the subject.

When the subject on the display screen is distinguished from the background and the subject is visually checked, the amount of light is directed toward the subject by a light emitting device, the brightness of the subject and the brightness of the background are measured, and the brightness of the subject is measured. It is also possible to separate the background and the subject from the brightness difference between the background and the background, extract the subject from the screen, and easily confirm the subject by visual observation.

When the subject in the display screen is distinguished from the obstacle located in front of the subject and the subject is visually checked, the distance to the subject within a limited distance range and the distance to the subject before the range are determined. The phase difference between a certain image is measured, and the background and the subject are separated from the phase difference between the subject and the foreground obstacle when the subject is focused, and the foreground obstacle is removed from the screen. Thereby, the subject can be easily visually confirmed.

As described above, according to the embodiment of the present invention, when the subject in the display screen is visually confirmed while distinguishing the subject from the background and the foreground, the distance between the background and the obstacle in the foreground of the subject and the subject are different. The subject can be easily selected by separating the subject from the screen and organizing the background and foreground obstacles.

[0040]

As described above, according to the present invention, it is possible to visually confirm the safety of accident prevention and crime prevention in other financial institutions such as railway stations, road crossings, airport passenger facilities, banks, post offices, and the like. Therefore, the monitoring target can be easily selected from the display screen of the monitoring display device which is performed by the user, so that the screen can be easily viewed by the monitoring personnel, and the labor and mental burden required for monitoring can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a block diagram of an image input unit according to the embodiment of the present invention.

FIG. 3 is a block diagram of an image input control unit according to the embodiment of the present invention.

FIG. 4 is a block diagram of an image signal processing unit according to the embodiment of the present invention.

FIG. 5 is an explanatory diagram of image signal processing in an image signal processing unit according to the embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 image input unit 2 image input control unit 3 image signal processing unit 4 display unit 5 photoelectric conversion unit 6 preamplifier 7 image signal amplification unit 8 cable 9 cable compensation amplification unit 10 color temperature correction amplification unit 11 contour compensation amplification unit 12 linear Matrix amplification unit 13 Shading correction unit 14 Compression unit 15 γ correction unit 16 Output amplification unit 17 AD conversion unit 18 MPU unit 19 Frame buffer unit 20 Image output unit 21 Subject

Claims (7)

[Claims] An image input unit for inputting a scene of a subject to be monitored as an image signal; an image input control unit for correcting an image signal input by the image input unit; An image signal processing unit that separates the included subject from a background or an obstacle of the subject, and a display unit that displays the subject separated by the image signal processing unit on a display screen. A monitoring display device for a subject. 2. The object monitoring apparatus according to claim 1, wherein the image signal processing unit separates the subject from the background based on a phase difference between the subject and the background. Display device. 3. The image signal processing section separates the subject and its background based on a hue difference between the subject and its background, and the background has a hue having a complementary color relationship with the subject. 2. The monitoring display device for a subject according to claim 1, wherein: 4. The image signal processing section separates the subject and its background based on a phase difference between the subject and its background, and the background has a hue having a complementary color relationship with the subject. 2. The monitoring display device for a subject according to claim 1, wherein: 5. The monitoring of a subject according to claim 1, wherein the image signal processing section separates the subject from the background based on a brightness difference between the subject and the background. Display device. 6. The image signal processing unit separates the subject and its background based on a brightness difference between the subject and its background, and the background has a hue that has a complementary color relationship with the subject. 2. The monitoring display device for a subject according to claim 1, wherein: 7. The image signal processing unit according to claim 1, wherein the subject and the background are separated based on a phase difference between the subject and an obstacle located in front of the subject. 2. The monitoring display device for a subject according to claim 1.