JPH01112884A - Picture processor - Google Patents

Abstract

PURPOSE:To shorten time when storage contents are transmitted with a video telephone by displaying a part in focus with a camera and not displaying other unnecessary parts. CONSTITUTION:When a figure A in the position of l1 from a camera 1 is in focus, a background B in the position of l2 is out of focus and dim. As the result, the part in focus has many high frequencies as frequency components and the part out of focus has few high frequencies. This signal passes through a high-pass filter 9 and a frequency/voltage converting circuit 10, passes through a voltage processing circuit 11 and is stored into the storage element of an address storage circuit 12. When the contents stored in the storage element of a picture storage circuit 3 are read out, a storage control circuit 8 gives an address setting signal and a reading-out signal to the picture storage circuit 3. As the result, as a picture to be displayed on a display 6, only the part A is displayed and the part B is not displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image processing device for displaying images of only necessary objects in a video signal using a camera.

2. Description of the Related Art With the development of electronic technology in recent years, it has become common to temporarily store video signals obtained by a camera in a storage device, retrieve them as needed, and display them on a display device. As for these applications, for example, the so-called "Inter 7-on with Entrance TV" is well known for storing the image of the visitor at the entrance and checking the visitor later. Another example is the case where images are transmitted using a telephone line.

The conventional image processing apparatus as described above will be described below with reference to the drawings.

FIG. 3 is a block diagram of a general image processing device.

In FIG. 3, 1 is a camera, 2 is an A/D converter, 3 is an image storage circuit, 5 is a D/A converter, 6 is a display device, 7 is a synchronization processing circuit, and 8 is a storage control circuit. ” In FIG. 3, when the camera 1 operates and outputs a video signal, the synchronization processing circuit 7 detects the synchronous part and outputs the timing to the storage control circuit 8.Storage control circuit 8
receives a signal from the synchronized portion of the video signal, operates an address counter, and operates to instruct writing and assign addresses to the video portion of the video signal. Further, the video signal of the camera 1 is converted from an analog signal to a digital signal by the A/D converter 2, and the video part of the video signal is stored in the storage element of the image storage circuit 3 according to the address assigned by the storage control circuit 8. .

On the other hand, the contents of the memory element of the image memory circuit 3 are outputted in accordance with the read instruction and address assignment of the memory control circuit 8.
The D/A converter 6 converts the video signal from a digital signal to an analog signal, and displays the stored image on the display device 6.

FIG. 4 shows a situation where the camera 1 is photographing a person image A and its background B, and FIG. 5 shows an image taken by the camera on a display device 6.
This is what is displayed. At this time, the human image A and its background B are both displayed.

Problems to be Solved by the Invention However, in many cases, for example, when making a videophone call, only the person image A is needed and the background B is not needed at all.
On the other hand, in some cases, an unpleasant situation may occur if background B is captured. Furthermore, in the case of a videophone, since a general telephone line is used, if an attempt is made to reduce the time required to transmit an image, it is possible to shorten the transmission time by transmitting only a person's image.

In view of the above problems, the present invention provides an image processing device that displays images of only necessary objects from a video signal obtained by a camera.

Means for Solving the Problems To achieve this objective, the image processing device of the present invention includes:
A first storage circuit that sequentially stores video signals of a camera adjusted to be in focus within a certain distance, and a section where the level of a high frequency signal component of the video signal is equal to or higher than a predetermined level. and a second storage circuit that sequentially stores the detection signals;
The second storage circuit simultaneously reads the stored signals, and outputs only the read video signal corresponding to the section in which the read detection signal exists.

Effect According to the above configuration, the part of the video signal with a high level of high frequency components is the video of the subject that the video camera focused on, so if only this part is extracted, the video signal of the necessary target can be extracted. That's what I did.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 shows an image processing apparatus of the present invention. In FIG. 1, 1 is a camera, 2 is an A/D converter, 3 is an image storage circuit, 4 is an image switching circuit, 6 is a D/A converter, 6 is a display device, 7 is a synchronization processing circuit, and 8 is a 9 is a bypass filter (H, P, F,), 10 is a frequency-voltage conversion circuit, 11 is a voltage processing circuit, and 12 is an address storage circuit. Further, FIG. 2 shows signal waveforms of each part in FIG. 1, where a is the video signal from the camera 1, b is a pulse that sets the part where the video part of the video signal is stored in the image storage circuit 3, and C is the signal waveform of each part of FIG.
is the output of the frequency-voltage conversion circuit 1o, and d is the output of the voltage processing circuit 11.

The operation of the image processing apparatus configured as described above will be described below.

In Figure 1, when storing camera video signals, camera 1
The video signals are synchronously separated by the synchronous processing circuit 7. Thereafter, the storage control circuit 8 applies an address setting signal and a write signal to the image storage circuit 3 based on the synchronization timing output of the synchronization processing circuit 7. As a result, the video portion of the camera video signal is stored in the storage element of the image storage circuit 3 according to its address. On the other hand, the video signal of camera 1 is
It will look like d in the figure. By the way, at this time, if camera 1 is adjusted so that it is in focus within a relatively narrow fixed distance, in Fig. 4, camera 1! The object image A located at the position ll will be in focus, and the background image B located at the position 4 will be out of focus. As a result, the portions that are in focus have many high frequency components, and the portions that are out of focus have fewer high frequency components.

FIG. 2a schematically illustrates this. When this signal passes through the bypass filter 9 and the frequency-voltage conversion circuit 1o, the voltage becomes high when the frequency component is high, and the voltage becomes low when the frequency component is low, resulting in an output as shown in FIG. 2C. This waveform passes through the voltage processing circuit 11 consisting of a Schmitt circuit or the like and becomes as shown in FIG.
It will be stored in the storage element of the address storage circuit 12.

On the other hand, when reading out the contents stored in the memory element of the image storage circuit 3, the storage control circuit 8 gives an address setting signal and a read signal to the image storage circuit 3, and as a result, the image storage circuit 3 outputs the image of the video signal. part is output and input to the image switching circuit 4. On the other hand, the storage control circuit 8 controls the image storage circuit 3
An address setting signal and a readout signal are applied to the address storage circuit 12 on separate lines, and the image switching circuit 4 is outputted by the signal output.
The signal from the image storage circuit 3 applied to 0N10FF
do. The signal is then applied to the D/A converter 5 and displayed on the display device e. The video signal processed as described above is displayed on the display device 6 in FIG. 5 because the focused portion of the person image A has a high frequency and the out-of-focus portion B has a low frequency. As an image, only part A will be displayed, and part B will not be displayed.

Effects of the Invention As described above, the present invention allows the camera to focus on the area that is in focus,
In other words, since the structure is such that the necessary parts of the object are displayed and other unnecessary parts are not displayed, it is possible to display the stored contents using a specific communication method, rather than just making it easier to see as an image. Since only the necessary parts are selected when transmitting data, it is possible to reduce the time required for transmission, which has a great practical effect.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the image processing device of the present invention, Fig. 2 is a waveform diagram of each part of the image processing device, Fig. 3 is a block diagram of a conventional image processing device, and Fig. 4 is a camera. FIG. 6 is an explanatory diagram showing an example of how the camera image of FIG. 4 is displayed on the display device. 1... Camera, 2... A/D converter,
3... Image storage circuit, 4... Image switching circuit, 5... D/A converter, 6... Display device 1.7... ...Synchronization processing circuit, 8...
・Memory control circuit, 9... Bypass filter,
1o... Frequency-voltage conversion circuit, 11...
... Voltage processing circuit, 12... Address storage circuit, A... Target human image, B... Background of human image A, a... Video signal from camera,
b...Pulse for setting the image storage part, C...
...Output waveform of frequency-voltage conversion circuit, d...
...Output waveform of the voltage processing circuit. Name of agent: Patent attorney Toshio Nakatashi and one other person Figure 1

Claims (1)

[Claims] a first storage circuit that sequentially stores video signals from a video camera adjusted to be in focus within a certain distance;
a means for creating a detection signal indicating an interval in which the level of a high-frequency signal component of the video signal is equal to or higher than a predetermined level; and a second storage circuit for sequentially storing the detection signal, the first and a second storage circuit, simultaneously reading out the stored signals respectively, and outputting only the read video signal corresponding to the section in which the read detection signal exists.