JPS63269880A - Compatible coding device for different video system - Google Patents

Abstract

PURPOSE:To communicate a video at low cost between different video systems by respectively providing a format converter for switching a sampling system at a transmission side and a format converter for switching an interpolating system in a receiving side. CONSTITUTION:In the format converter 15 of the transmission side, when an input signal 1 has an NTSC system to a Y/C separating signal 5, L lines are sampled from the nXL of a picture part simply starting from a prescribed line and at the time of a PAL or a SECAM system, the L lines are formed in a rate to thin out one of six input lines by using a weighting means between the lines. In the format converter 21 of the receiving side, at the time of the NTSC system, a linear interpolation is executed to the L lines of a picture reproducing signal 20 to form the nXL lines and at the time of the PAL or the SECAM system, an interpolation in a rate of 1, to 5 is executed in addition to a linear interpolation to form the nXLX1.2 lines.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a single image encoding/decoding device.

[Conventional technology]

FIG. 4 is a diagram showing the configuration of the transmitter side and the receiver fil+ in a conventional image encoding and transmitting apparatus between the same video format. In the figure, 2 is an A/i) converter that converts a human video signal 1 into a digital image signal 3.

4 is a Y/C that separates the Y component of the luminance signal and the C component of the color difference signal.
It is a separator and sends out Y/C separated 1g No. 5. Reference numeral 6 denotes a transmitting-side encoding/decoding circuit that performs encoding and transmission processing on the image signal, and sends out encoded information 7. 8 is a digital transmission path, and 9 is encoding information f! Picture 11 from 17! This is a receiving side encoding/decoding circuit that reproduces the signal, and the image reproduction signal 1
Sends 0. 11 is a Y/C combiner that combines the Y component of the luminance signal and the C component of the color difference signal, and the Y/C combined signal 12
Send out.

13 is a D/A converter that converts the Y/C combined signal 12 into an analog output signal 14;

Next, the operation of the conventional image encoding and transmitting apparatus shown in FIG. 4 will be explained. In the human video signal 1 on the transmitting side, in the case of NTSC system, 30 frames per second, 525 horizontal scanning lines per frame, PAL or SBCAM
In the case of this method, the rate is 25 frames per second, and 625 horizontal scanning lines per frame.

The same applies to the analog output signal 14 on the receiving side.

First, on the transmitting side, the human video signal 1 is converted into an A/Di converter'I52.
After being converted into a digital image signal 3 excluding horizontal and vertical synchronization parts, a Y/C separator 4 converts the luminance signal Y into a digital image signal 3.
component and color difference signal C component. Next, in the transmitting side encoding/decoding circuit 6, the encoding target range of the Y/C separated signal 5 by the Y/C separator 4 is M ('M is a positive integer) pixels in the horizontal direction.

Image encoding and frame drop processing are performed on L (L is a positive integer) pixels in the vertical direction, and the encoded information 7 is sent to the digital transmission path 8. This one gin, vertical L
As for pixels, only one field in one frame is to be encoded, and the number of pixels to be encoded is further limited by sampling lines at equal intervals. The same applies to M pixels in the horizontal direction.

On the other hand, on the receiving side, the receiving side encoding/decoding circuit 9 converts the encoded information 7 received from the digital transmission path 8 into an image reproduction signal 10 with M pixels in the horizontal direction and 5 pixels in the vertical direction.
The Y/C synthesizer 11 synthesizes the luminance signal Y component and the color difference signal C component while performing linear interpolation in the horizontal and vertical directions, and converts the Y/C synthesized signal 12 into a D/A converter 513.
The analog output signal 14 is converted and outputted. Note that for frames that are lost due to frame omission, the immediately preceding image drafting signal is repeatedly output.

[Problems to be Solved by the Invention] Since the above-mentioned conventional picture-in-picture coding transmission device is configured as described above, when the video formats are different between the transmitting side and the receiving side, it is possible to Since the ratio of the image portion to the entire screen in the vertical direction S differs between the side image and the old image, which distorts the ancient image, there is a problem that a new video format conversion device is required on the transmitting side or the receiving side 1p11.

The present invention has been made in order to solve this problem, and aims to provide an encoding device compatible with different video formats that can perform video communication between different video formats without adding the video format conversion device to the outside. purpose.

[Means for solving problems]

A coding device compatible with different video formats according to the present invention (on the transmission side, 1jJ on the input side is installed before the coding/decoding circuit)
-Format change that changes the sampling method according to the image signal (1! is provided, and in the reception 1all, the video signal on the output side is installed after the encoding/decoding circuit.) It is equipped with an AG.

[Effect]

In the encoding device compatible with different video formats of the present invention, the format converter on the transmitting side converts PAL or SR (in the case of the 1-decision 1-fusuma system to NT S (in the case of the 'AM system)
Compared to the case of the C method, sampling for vertical lines is reduced, and PAL or SECA is used on the receiving side.
In the case of the M method, by increasing the number of line interpolations in the vertical direction compared to the case of the NTS C method, the transmission side,
The ratio of the image to the full screen in the vertical direction (receiving) should be made to match.

[Embodiment] No. 114 is a block diagram showing the configuration of the transmission side and the reception t11 in a coding device compatible with different video formats which is an embodiment of the present invention, and each reference numeral 1 to 14 is the same as that shown in FIG. Conventional boss? It is the same as that of lJ. In Figure t, 15
is a send-I ■ Liu format transformation device, and it sends out the format-converted I-No. 16. 17 is sending i+l! 1 frame memory, and sends the encoding target frame 4i No. 18. Reference numeral 19 denotes a receiving side frame memory that stores the image reproduction signal 10 and sends out the one-image reproduction signal 20. 2
1 is received! ]Format converter, former,
A soto-converted signal 22 is sent out.

FIG. 2 shows that the first transmission Il video IA1 method in the different video format compatible encoding device 6 of FIG.
, vg3 is an explanatory diagram showing an example of format conversion on the transmitting side in the case of the CAM system, and is an explanatory diagram showing an example of format conversion on the transmitting side in the case of the CAM system. One method is P A
L or 8 E CA (Uke+if in case of v10000
It is an explanatory diagram showing an example of b't11 format conversion.

Next, the operation of the encoding device compatible with different video formats, which is an embodiment of the present invention shown in FIG. 1, will be described. For the Y/C separated signal 5 on the transmitting side, the transmitting side format converter 15 simply converts nXL(n, L is a positive integer and nXL is less than 525)), whereas in the case of PAL or SECAM, the number of horizontal scanning lines in one frame is 625 and N' l” SC method.

Using the line-to-line weighted average, one of the six input lines is decimated < WIJ to generate the above lines. FIG. 2 shows an example of format conversion on the transmitting side when the input video signal 1 is PAL or SECAM. After the format-converted signal [6 is once stored in the transmitting side frame memory 17, it is read out as the encoding target frame signal 18 according to the encoding processing timing of the transmitting side encoding/decoding circuit 6. Encoded information 7 sent from the transmitting side encoding/decoding circuit 6 is transmitted to a digital transmission path 8 .

On the other hand, after the image reproduction signal IO reproduced by the receiving side encoding/decoding circuit 9 is stored in the receiving side frame memory 19,
Image reproduction signal 20 for each frame period of the receiving side video system
It is read as . At this time, frames that have been dropped due to the encoding process on the transmitting side, or frames that the transmitting side is PAL or SE
For frames that are missing when the receiving side uses the NTSC method in the case of the CAM method, the immediately preceding image reproduction signal 20 is repeatedly read out. Next, in the receiving-side format converter 21, if the receiving one-rule video system is the N'r SC system, the above-mentioned lines of the image reproduction signal 20 are subjected to gamut interpolation, and the above-mentioned number x L lines are converted. generate a line of PA
In the case of L or SECAM method, - the above linear interpolation is
Then, interpolate at a rate of 1 in 5 lines to obtain n×L×
1.2 (n×L×1.2 is a positive integer) lines are generated. Figure 3: 1. This is a reception 1111-multiplex system that is PA.
An example of format conversion on the receiving side in the case of the L or 81 (CAM system) is shown. The format-converted signal 22 that has been format-converted by the receiver format converter 2N is output to the Y/C combiner 11. After combining the Y component of the luminance signal and the C component of the color difference signal, the signal is D/A converted by a D/Af converter 11, and an analog output signal 14 is outputted on the receiving side in an analog method.

In the above embodiment, the number of pixels to be encoded in the encoding/decoding circuit is fixed, but it is also possible to switch the number and range of pixels to be encoded in the format converter.

〔Effect of the invention〕

As explained above, this invention uses a different image system compatible encoding Vclnt4, and uses a common encoding/decoding circuit for encoding and decoding processing on the transmitting side and the receiving side, and Since the format conversion 4 is provided before the encoding/decoding circuit and after the encoding/decoding circuit on the receiving side, the device can be constructed at low cost, and video communication between different projection systems is possible. This provides an excellent effect in that an extremely versatile and compatible encoding device for different video formats can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a transmitting side and a receiving side in an encoding device compatible with different video formats, which is an embodiment of the present invention, and FIG. 2 is a transmission 1111i in the encoding device compatible with different video formats shown in FIG. The first method is PAL or SECAM
An explanatory diagram showing an example of format conversion on the transmitting side in the case of the method, wIB diagram is a different type of figure 1, reception in the absorption method mutually encoded Minato direct! l1lI video format is PAL or S
An explanatory diagram showing an example of format conversion on the receiving side in the case of the HCAM method. It is a block diagram. In the figure, 1... input type 111 signal, 2... A/
D Transformer, 3...Digital Artist Priest, 4...Y/
C segmenter, 5... Y/C segment adjacent signal, 6... Transmitting side encoding/decoding output circuit, 7... Encoding information, 8... Digital transmission line, 9... Receiving side encoding 1 summer issue circuit, 10,
20...1ii11 reproduction polarization code, 11...Y/C signal, 12...Y/C synthesis station signal, 13...1)/A transformer, 14...analog output No. 13. 15... Sending side format converter, 16.22...
・Four 7th modified signal, 17... Transmission [11111
Frame memory, 18... frame signal to be encoded,
19... Receiving side frame memory, 21... Receiving side format converter. In each figure, the same reference numerals indicate the same or equivalent parts. Figure 3 (PAL71/SECAM method) % type % 3 Digital transfer image transmission 5: Sanskrit tH No. 7: No; 12°VcO wide signal 14: Analog ±2'7 signal

Claims (3)

[Claims] (1) On both the transmitting side and the receiving side, each frame has M (M is a positive integer) pixels in the horizontal direction and L (L is a positive integer) pixels in the vertical direction, and every second is N (N is a positive integer). ) A common encoding/decoding circuit that performs encoding/decoding processing on a digital signal series having a predetermined format as a frame is provided, and the transmitting side converts the digitally converted input signal of the transmitting side video system into the above-mentioned predetermined format. a first format converter that converts the format into a format and outputs it to a first encoding/decoding circuit on the transmitting side; What is claimed is: 1. A coding device compatible with different video formats, comprising a second format converter that converts a playback signal having a format of 1 to a format of a receiving video format, and performing image coding transmission between different video formats. (2) In the first format converter, if the transmitting side video system is the NTSC system, the horizontal scanning line 52
L lines are taken out by sampling every n (n is a positive integer) line from the image part out of 5, and in the case of PAL or SECAM, the line-to-line weighted average is taken from the image part out of 625 horizontal scanning lines. In the second format converter, when the video system on the receiving side is the NTSC system, the data for the L lines of the playback signal is generated using
Linear interpolation is performed on the actual lines to generate n×L lines, and in the case of PAL or SECAM, in addition to the above n×L lines obtained by the linear interpolation, 5
Interpolation is performed at a rate of one book per book, and n×L×1.2 (n×L
2. The encoding device compatible with different video formats according to claim 1, wherein the encoding device generates lines (×1.2 is a positive integer). (3) Number of frames per second in the above prescribed format N
By periodically dropping frames on the input signal sequence in the first format converter, if the video system on the transmitting side is the NTSC system, the above N frames are selected from among 30 frames per second. In the case of the PAL or SECAM system, the above-mentioned N frames are outputted from among 25 frames per second, and the above-mentioned second format converter outputs the above-mentioned N frames per second or the first
Until the next reproduction signal is generated by the second encoding/decoding circuit on the receiving side for the reproduced signal sequence whose number of frames per second is less than N due to frame dropping processing by the encoding/decoding circuit. The previous playback signal shall be repeatedly output during the period, and if the receiving side video system is NTSC, 30 frames per second shall be output,
The encoding device compatible with different video formats according to claim 1, which outputs 25 frames per second in the case of an AM format.