JP2001186412A - Image processing device and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a very natural composited image signal from a moving picture and a still picture. SOLUTION: Through the selection of a contact (b) of a changeover switch SW2 and of the composition of a moving picture area in a moving picture signal and a still picture recorded in a PCM area, a moving picture area detection circuit 207 detects a moving picture area of a moving picture signal outputted from a memory 206 and a moving picture area extracting circuit 208 extracts only the moving picture area. On the other hand, the PCM still picture signal reproduced from the PCM area is stored in a memory 210 via a PCM reproduction processing circuit 209 and a moving picture area elimination circuit 211 eliminates an area decided to be the moving picture area by the moving picture area detection circuit 207. An adder 212 adds the moving picture signal and the still picture signal thus obtained and a digital/analog converter 213 converts the added signal into an analog signal and provides an output of it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus for processing an image signal and a method thereof.

[0002]

2. Description of the Related Art In recent years, the demand for high-density recording has been increasing in the field of magnetic recording, and video tape recorders (V
TR), the running speed of the tape is reduced, and higher-density magnetic recording is performed.

However, when the running speed of the tape decreases,
For example, when an audio signal is recorded using a fixed head, there is a problem in that the relative speed cannot be increased and the reproduced sound quality is deteriorated.

As a means for solving this problem, there is a method in which the length of a track scanned by a rotary head is made longer than in the prior art, and an audio signal whose time axis is compressed is sequentially recorded as an extension thereof. Specifically, in a rotary two-head helical scan type VTR, a magnetic tape is conventionally wound around a rotary cylinder by 180 degrees or more, but in this method, a magnetic tape is wound by (180 + θ) degrees or more and extraly wound. An audio signal that has been converted to PCM and compressed on the time axis is recorded in the portion of θ ″.

FIG. 2 shows a tape running system of such a VTR, and FIG. 3 shows a recording locus on a magnetic tape by the VTR shown in FIG. In FIG. 2, 214 is a magnetic tape,
215 is a rotary cylinder, and 201a and 201b are magnetic heads mounted on the rotary cylinder 215. In FIG. 3, reference numeral 216 denotes a video signal recording area of a track formed on the tape 214, and 217 denotes a PCM audio signal recording area. The PCM audio signal recording area 217 traces the θ portion of the rotary cylinder 215 in FIG.

As described above, as an example of applying the method of recording a PCM signal in another area while recording a video signal, it has been proposed to convert a still picture video signal into PCM in a PCM area 217 and record it. I have. If the image is a still image, it is possible to record all the information on the magnetic tape by scanning the PCM area 217 a plurality of times.
According to this recording method, a still image can be photographed using the same photographing apparatus and the same recording medium as used for moving image video photographing. In addition, it is possible to obtain a still image with higher image quality than a still image signal obtained by stopping the tape running and reproducing the video signal of the same track in the conventional VTR.

Further, in this case, when reproducing a still image recorded in the PCM area, a request for synthesizing with a moving image from a video camera, a VTR, or the like may be considered.

[0008]

However, in the above case, when it is desired to combine moving images from a video camera or another VTR with a still image as a background, the two image data are simply combined (added). In this case, the moving image and the still image are merely translucently synthesized. For example,
The landscape is recorded in the still image of the magnetic tape 214,
When a moving image of a person from a camera or another VTR is combined with the scenery, the moving images are merely translucently combined with each other, and the purpose of image synthesis of displaying a person with the scenery as a background can be achieved. Not desirable.

An object of the present invention is to provide an image processing apparatus and a method therefor which have solved the above problems.

[0010]

In order to achieve the above object, the present invention provides first input means for inputting a first image signal and second input means for inputting a second image signal. Extracting means for extracting a moving image area from the first image signal; removing an image signal at a position corresponding to the moving image area from the second image signal;
And a first image signal corresponding to the moving image area.

Also, a first image signal is input, a second image signal is input, a moving image area is extracted from the first image signal, and a moving image area corresponding to the moving image area is extracted from the second image signal. And removes the image signal at the position where
And the first image signal corresponding to the moving image area.

[0012]

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

FIG. 1 shows a circuit configuration of an image processing apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 201 denotes a VT
A magnetic head of a magnetic recording and reproducing apparatus such as R, a reproducing amplifier 202 for amplifying a signal reproduced by the magnetic head, and a reproducing circuit 203 for reproducing a signal amplified by the reproducing amplifier and converting the signal into a video signal. An A / D converter 204 digitizes an analog video signal, a memory controller 205 controls a memory 206,
The memory 206 stores a digital video signal obtained by digitizing an analog video signal.

Reference numeral 207 denotes a moving image region detecting circuit for detecting a moving image region of a video, and 208 denotes a moving image region extracting circuit for extracting only a region determined as a moving image region by the moving image region detecting circuit 207 from a digital video signal. Reference numeral 209 denotes a PCM reproduction processing circuit that converts (demodulates) a PCM signal reproduced by the magnetic head 201 into a still image video signal, 210 denotes a memory that stores the still image video signal, and 211 denotes a PCM area (21
7) The moving image area detection circuit 2 of the still images reproduced from
This is a moving image area deletion circuit for deleting an image portion of an area corresponding to an area determined to be a moving image area by 07. 212, an adder for synthesizing the video signals of the moving image and the still image;
Reference numeral 13 denotes a D / A converter for converting the digital video signal synthesized by the adder 212 into an analog signal.

Next, the operation of the above device will be described along the flow of signals. First, a moving image signal will be described. FIG.
Magnetic head 201 of a magnetic recording / reproducing device such as a VTR shown in FIG.
Are output from the reproduction amplifier 202 and become video signals in the reproduction processing circuit 203. This video signal or a video signal input from an external input terminal (both analog video signals or moving image signals, hereinafter,
The moving image signal is selected by the changeover switch SW1. Then, the selected moving image signal is digitized by the A / D converter 204. The digitized moving image signal is temporarily stored in a memory 206 controlled by a memory controller 205.

When the moving picture signal is simply combined with the still picture recorded in the PCM area, or when either one of the pictures is output without the combining, the changeover switch SW2 is connected to the contact a, and Video area and PCM area (21
When synthesizing the still image recorded in 7), the changeover switch SW2 is connected to the contact b.

Here, the contact b in the changeover switch SW2
Is selected, and the combination of the still image recorded in the moving image area and the PCM area in the moving image signal is selected.
The moving image signal output from the moving image area detection circuit 207
The moving image region is detected, and only the moving image region is extracted by the moving image region extraction circuit 208 based on the detected data.
That is, a still image portion in a moving image signal (for example,
Background) is removed.

Next, a still image recorded in the PCM area (217) will be described. The PCM still image signal reproduced from the PCM area is subjected to reproduction processing in the PCM reproduction processing circuit 209 to become a digital still image signal, and the memory 210 controlled by the memory controller 205
Is stored.

In the still image signal output from the memory 210, the moving image area deleting circuit 211 deletes the area determined as the moving image area in the moving image area detecting circuit 207.

With the processing described above, the camera or V
From the moving image signal from the TR or the like, only the moving image area that is currently moving is obtained. From the still image signal recorded in the PCM area, a still image obtained by extracting the area corresponding to the moving image area in the moving image signal is obtained. can get. These signals are added by an adder 212, converted into an analog signal by a D / A converter 213, and output.

[0021]

As described above, according to the present invention,
A moving image in the first image signal can be synthesized very naturally with the second image signal.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a circuit configuration of an image processing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a traveling system of a VTR.

FIG. 3 is a diagram showing a recording locus on the magnetic tape of FIG. 2;

[Explanation of symbols]

 Reference Signs List 201 Magnetic head 202 Reproduction amplifier 203 Reproduction processing circuit 204 A / D converter 205 Memory controller 206 Memory 207 Video region detection circuit 208 Video region extraction circuit 209 PCM reproduction processing circuit 210 Memory 211 Video region deletion circuit 212 Adder 213 D / A converter

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) H04N 5/7826 H04N 5/92 H 5/92 (72) Inventor Shinichi Koyama 3-chome Shimomaruko, Ota-ku, Tokyo 30-2 Inside Canon Inc. (72) Inventor Hidetoshi Wada 3-2-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc.

Claims (2)

[Claims] A first input means for inputting a first image signal; a second input means for inputting a second image signal; and an extraction means for extracting a moving image area from the first image signal. And removing an image signal at a position corresponding to the moving image region from the second image signal, and combining the removed second image signal with a first image signal corresponding to the moving image region. An image processing apparatus comprising: a synthesizing unit. 2. A first image signal is input, a second image signal is input, a moving image area is extracted from the first image signal, and a moving image area corresponding to the moving image area is extracted from the second image signal. An image processing method comprising: removing an image signal at a position where the moving image is to be removed; and synthesizing the removed second image signal and a first image signal corresponding to the moving image area.