JPH01171385A - Digital television video signal processor - Google Patents

Abstract

PURPOSE:To execute an exact blanking processing by providing a circuit to switch a Y signal to a constant value, which is smaller than a pedestal level, in correspondence to a signal to show a blanking period and integrating the value of data, which show the blanking period, into picture data. CONSTITUTION:A video input signal 1 is converted to the PCM data of 8 bits, for example, by an A/D 2. In a blanking period generator 11, a blanking(BLK) control signal 14 to be synchronized to the video input and to express the blanking period is obtained from vertical phase information 12 and a clock 13. A selector 7 is operated by the BLK control signal 14 and the BLK data from a BLK data generator 8 are padded into the Y signal after being black- clipped. Here, the BLK data are obtained as a 3B (16-ary). Since there is no value of <3C for the Y signal by a black clip 6, the period of the value 3B can be easily and securely detected with the blanking period.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital television video signal processing device, and particularly to a blanking period processing technique.

[Conventional technology]

Conventionally, in a device that processes video data obtained by converting a television video signal into a digital signal (PCM data),
When an image shift is involved, the blanking period, which is not the video period, may become the subject of processing, and in such a case, it is necessary to stop the processing. In order to stop this processing, the blanking phase of each circuit that requires processing to be stopped is calculated from the amount of delay in the system, a blanking phase is created individually, and this is used as a control signal to stop processing. there was.

[Problem that the invention seeks to solve]

In conventional methods, the more routes there are to process video data, and the more parts need to stop processing during the blanking period, the more circuits that create the blanking phase in each part increase. As time goes by, there are many drawbacks.

[Means for solving problems]

In the present invention, by incorporating the data value indicating the blanking period into the video data, the blanking phase can be detected by reading this data value in each processing circuit, and many video data processing routes can be used. Even if there is a problem, cancellation processing can be easily and accurately performed.

In particular, in image processing using motion vector values, the vector values change for each field, so in the past it was impossible to obtain an accurate blanking phase. Since it is always integrated with the blanking information, accurate blanking processing can be performed.

〔Example〕

Next, the present invention will be explained with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention, in which a video input signal 1 is an A/
For example, it is converted to 8-bit PCM data by D2,
The Y/C separation circuit 3 separates the signal into a luminance signal 4 and a chroma signal 5. Luminance signal (hereinafter referred to as Y signal)
In the black clip 6, all values below 30 (hexadecimal) of the PCM data corresponding to the pudestal level are replaced with 30.

On the other hand, the synchronization separation circuit 9 obtains horizontal phase and vertical phase information 12 from the video input. A clock signal 13 is also obtained by the clock generator 10. The blanking period generator 11 includes horizontal and vertical phase information 12 and a clock signal 1.
3, a blanking (ELK) control signal 14 representing a blanking period is obtained in synchronization with the video input. The selector 7 is operated by the BLK control signal 14, and the blanking data from the blanking data generator 8 is embedded in the Y signal after black clipping. Here, the blanking data (BLK value) is, for example, 3B (hexadecimal). Since the Y signal has no values less than 03C due to the black clip 6, the period of the value 3B can be easily and reliably detected as the blanking period.

FIG. 2 shows frame number conversion processing using motion vectors according to the present invention. Here, since the chroma signal and the luminance signal are processed in the same way, only the luminance signal will be described. In the figure, luminance signal i after BLK price change
5 (y+) is compared with the luminance signal 17 (Y2) of one frame before, which has passed through the frame delay circuit 16, and the motion vector value detection circuit 18 determines the direction of movement and its magnitude. Frame number conversion requires processing to obtain a signal between the Y1 signal and Y2 signal, and since the time difference between the Y1 signal and Y2 signal and the time relationship after the desired frame number conversion are determined in advance, phase conversion is required. circuit 20
In this case, the vector value 19 (V
l) to convert the Y1 signal to VIXk as shown in Figure 3.
After moving the Y2 signal by (-Vl) x (t-k), the output is 21 (Y3).
can be obtained.

However, since the phase conversion circuit 20 moves the original image, blanking occurs at the edges of the image data. When the 3B (hexadecimal) value embedded as blanking information appears, the phase conversion circuit 20
This is detected and output as a BLK1 signal (22).

In the process shown in Fig. 2, Y115 is set by the BLKI signal.
In order to use the result of simply adding Y217 and Y217, the output of the adder circuit 23 is selected by the selector 24. This allows frame number conversion processing to be performed without outputting blanking even at the edges of the image.

〔Effect of the invention〕

As shown in the embodiment, the blanking phase of the processed image changes depending on the motion vector value, but if this blanking period is to be obtained by an external circuit as in the past, the same circuit as the video data system is required. However, according to the present invention, since the blanking information is embedded in the video data, the blanking period can be extracted from the video data after movement, and the circuit configuration can be simplified even when image processing according to the motion vector is included. It has the effect of making it easier.

[Brief Description of the Drawings] Fig. 1 is a diagram showing an embodiment of the present invention, Fig. 2 is a diagram showing a case where the present invention is applied to a frame number conversion circuit, and Fig. 3 is a diagram showing a case where the present invention is applied to a frame number conversion circuit. FIG. Agent: Patent Attorney Otozuzu Uchihara

Claims (1)

[Claims] In a device that A/D converts an input television video signal, converts it into PCM image data, performs Y/C separation, and processes the video data, a circuit that black clips the Y signal with a pedestal value, and an input television a generator for generating a signal indicating a blanking period in synchronization with a video video signal; and a circuit for changing the Y signal to a constant value smaller than the pedestal level in accordance with the obtained signal indicating the blanking period;
A digital television video signal processing device capable of detecting a blanking period based on the constant value included in the Y signal when performing video processing.