JP3341429B2 - Video signal processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal processing apparatus for processing a reproduced image signal and supplying the processed image signal to an image display device.

[0002]

2. Description of the Related Art Conventionally, when an image signal captured by a video camera or the like is reproduced at a speed different from that at the time of recording, when the reproduction speed is low, image data is displayed by overlapping image data. Also, when the playback speed is high,
The image data is thinned out, only a part of the image data is taken out and the image is displayed, and the other image data is discarded. Specifically, for example, in the case where the reproduction speed is n times, that is, when the image data for one frame is reproduced at the time for reproducing the image data for one frame at the standard speed, 1 / n, that is, for one frame, Only the image data is reproduced, and the image data of the remaining n-1 frames is not reproduced. In general, a reproduced image signal is processed using such a method to display image data.

[0003]

By the way, when an image signal reproduced at n times speed is reproduced and displayed, an image at n times speed, that is, a high speed image is displayed. The screen is switched to another, which makes it difficult to visually recognize the image content.

In view of the above circumstances, the present invention provides a video signal processing apparatus capable of displaying an image signal reproduced at a high speed as an image which is easily viewed.

[0005]

According to the present invention, there is provided a video signal processing apparatus for processing an image signal reproduced at n times speed and supplying the processed image signal to an image display apparatus. The image signal reproduced at double speed is divided into continuous visible time ranges, and an image signal of one block is extracted for every n blocks of the divided blocks, and the extracted temporally continuous image signal is reproduced. The above-mentioned problem is solved by converting the speed to the standard speed.

The image processing apparatus further comprises a storage means for storing the image signal in the visible time range, and writes a 1 / n image signal of the image signal reproduced at the n-times speed into the storage means at the standard speed. And immediately after the reading is completed, the 1 / nth of the image signal reproduced at the next n-times speed is read out.
, Writing of image signals in a continuous visible range of time to the storage means is started.

[0007]

According to the present invention, an image signal is extracted from an image signal reproduced at a high speed within a visible time range and an image is displayed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of an image editing system using a video signal processing device according to the present invention.

An image photographed by an imaging device such as a video camera 1 is converted into a signal of a predetermined recording format and recorded on a recording medium such as a cassette tape 2. The image signals recorded on the cassette tape 2 are reproduced by a plurality of reproducers 3 at a high reproduction speed. The reproduced image signal is transferred to the video signal processing device 4 and the editing device 6 according to the present invention. The image signal transferred to the video signal processing device 4 is converted into an image signal at a standard speed, and then further converted into an image signal suitable for a display device such as a monitor 5. The converted image signal is sent to the monitor 5 to display an image. The image signal transferred to the editing device 6 is stored in an image editing memory in the editing device 6 and edited.

Next, FIG. 2 shows a schematic configuration of a video signal processing apparatus according to the present invention. An image signal reproduced at a high reproduction speed is input from the image reproduction signal input terminal 10 in FIG.

FIG. 3 shows the timing of each signal in the configuration shown in FIG. In FIG. 3, specifically, an image signal reproduced at 4 × speed is supplied to the image reproduction signal input terminal 1.
The timing of each signal when it is input to 0 is shown. In the case where an image signal in a continuous time range in which the image content can be visually recognized among the image signals reproduced at the quadruple speed is an image signal for m + 1 frames from 0 frame to m frame, this m + 1 frame The image data for one minute is considered as one block of image signal. Further, since the input image reproduction signal is an image signal reproduced at quadruple speed, it is necessary to take out continuous images at a rate of 1/4 and convert them to images at standard speed.

Here, the continuous visible time range is m
Specifically, the image data of each block is divided into four blocks from a first block to a fourth block, and one of the four blocks is divided by one frame.
What is necessary is just to read out the image signal for the block at a standard reproduction speed while writing it in the storage means. At this time, the timing immediately after all the image signals for one block written from the storage means are read out, the image signal for one block of the four blocks of the image signal reproduced at the quadruple speed is next determined. It is time to write to the storage means. By repeating such an operation, an image signal in a visible time range can be continuously read out without interruption.

More specifically, a memory write signal shown in FIG. 3B is sent from the control unit 12 to the memory 11.
Based on the memory write signal, only the image data of the first block, for example, of the image reproduction signal input from the image reproduction signal input terminal 10 in FIG. After the image data of the first block is written into the memory 11, the image data of the second to fourth blocks is discarded.

At the same time as the image data is written to the memory 11, a memory read signal shown in FIG. 3c is sent from the control unit 12 to the memory 11. Based on the memory read signal, the image data of the first block written in the memory 11 is sequentially read at a standard reproduction speed.

Immediately after the reading of the image data of the first block is completed, the first block of the image reproduced signal reproduced at the next quadruple speed is again reproduced based on the memory write signal from the control unit 12. The image data is stored in the memory 1
Written to 1. As described above, the control unit 12 writes and writes an image signal to the memory 11 so that a continuous image is displayed when the image data is displayed on the display device such as the monitor 5 in FIG. The reading of the image signal from the memory 11 is controlled.

An image signal for one block read from the memory 11 is input to an image signal processing circuit 13,
The image signal is converted into an image signal for one block at a standard reproduction speed that can be displayed on the display device at the output destination, that is, an image output signal shown in FIG.

More specifically, the image signal input to the image signal processing circuit 13 is an image signal suitable for a display device of an output destination, for example, an NTSC signal or PAL signal for color television, and an RGB signal or _CR. / C _B / Y signals can be converted to various image signals. Also,
It is possible to convert not only an image signal of a normal color television broadcasting system but also an image signal output to a display device of a personal computer.

Here, if the image signal within the visible time range is 0.5 seconds, when the image signal is reproduced at 4 × speed, the m + 1 frame for one block becomes 15 frames, and 2 seconds. Although an image corresponding to 1.5 seconds of the image corresponding to the minute is lost, since an image corresponding to 0.5 second is continuously reproduced at a standard reproduction speed, the visibility of the image is improved.

Also, when hitting a cue in an image search,
The response speed of this cue is relative to the standard speed,
By reproducing the image at the standard speed as described above, it is possible to actually make a cue corresponding to the display screen of the monitor 5, so that high-speed dubbing of an image such as news is performed, and Selection can be made easily.

The memory may be a storage element that performs two-phase control of writing and reading, in addition to a storage element that performs first-in first-out. In addition, 2
A plurality of frame memories may be used by switching between a read-only memory and a write-only memory.

When recording the image data on the cassette tape 2 of FIG. 1, the image data is subjected to a compression encoding process, and the compressed and encoded image data is input to the video signal processing apparatus according to the present invention. Alternatively, a decompression decoding process may be performed.

Further, in the above embodiment, the case where an image signal reproduced at 4 × speed is input has been described in detail. However, when an image signal reproduced at n × speed is input, n is not an integer. In other words, when the value has a value below the decimal point, a frame memory is prepared using the rounded-up value of n, and a synchronizer is added in the image signal processing circuit 13 to obtain the same effect as in the above embodiment. be able to.

[0023]

As is clear from the above description, the video signal processing apparatus according to the present invention processes an image signal reproduced at n times speed and supplies the image signal to the image display apparatus for supplying the same to the image display apparatus. In the signal processing device, the image signal reproduced at the n-fold speed is divided into continuous visible time ranges, and one block of the image signal is extracted for each of n divided blocks. By converting the reproduction speed of the continuous image signal to the standard speed, the displayed image content can be easily visually recognized.

The image processing apparatus further comprises storage means for storing the image signal of the image in the visible time range, and writes 1 / n of the image signal reproduced at the n-times speed into the storage means. Immediately after the reading at the standard speed, immediately after the reading is completed, the writing of the image signal reproduced at the n-times speed into the image signal reproduced at the n-times speed and one-nth of the image signal into the storage means is started. By doing so, the displayed image content can be easily visually recognized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an image editing system using a video signal processing device according to the present invention.

FIG. 2 is a diagram showing a schematic configuration of a video signal processing device according to the present invention.

FIG. 3 is a diagram showing timing of each signal in the configuration of FIG. 2;

[Explanation of symbols]

 11 Memory 12 Control unit 13 Image signal processing circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/91-5/956 G09G 5/00

Claims (2)

(57) [Claims] 1. A video signal processing device for processing an image signal reproduced at n-times speed and supplying the processed image signal to an image display device, wherein the image signal reproduced at n-times speed is divided into continuous visible time ranges. A video signal processing apparatus for extracting an image signal of one block out of n blocks of the divided blocks and converting a reproduction speed of the extracted temporally continuous image signal into a standard speed. 2. A storage means for storing the image signal in the visible time range, wherein the image signal is read at a standard speed while writing one block of the image signal for each of the n blocks, and immediately after the reading is completed. 2. The method according to claim 1, further comprising: starting to write the image signal having a continuous visible time range at a ratio of 1 / n in the image signal reproduced at n times speed to the storage means. Video signal processing device.