JPH0445032B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high-definition television receiver capable of obtaining a clearer image when the screen is held still.

[Prior art]

Originally, television receivers were intended for viewing moving images in real time, but in recent years, additional functions such as screen freeze, slow still, and hard copy have attracted attention.

In response to such requests, the MUSE method has four
This method uses redundancy between fields to significantly compress the bandwidth and reproduce a more detailed screen. On the receiving side, a satisfactory moving image is created by static area filtering processing using these four fields (interpolation processing of pixel data thinned out for band compression) and moving area filtering processing using the current one field. can be obtained.

FIG. 2 is a diagram showing the main blocks.
1 is a television signal input section, 2 is an input signal processing section including an A/D converter, 3 is a frame buffer (memory) for 4 fields, 4 is an image still area filter, 5 is a moving area filter, and 6 is an input signal processing section including an A/D converter. A switch that is switched for each pixel according to the result of image motion detection,
7 is an output signal processing section including a D/A converter.

However, the stationary area filter 4 and the dynamic area filter 5 are limited by real-time processing, and even if the characteristics of the filters are improved, there are limits in terms of hardware.

For this reason, when a moving image is captured as a still image, image deterioration in the moving region cannot be ignored.

[Purpose of the invention]

The purpose of the present invention is that even when the screen is stopped,
The objective is to make it possible to reproduce images of moving areas more clearly.

[Structure of the invention]

To this end, the present invention stores input pixel signals in a frame buffer, interpolates pixel data in a still area using a first still area filter, and interpolates pixel data in a moving area using a first moving area filter, respectively. In a television receiver that processes and reproduces data within a time period of a second moving area filter that inputs the output of the frame buffer and interpolates pixel data of a moving area by the second time-consuming process; the second still area filter; A still image frame buffer that stores data interpolated by two moving area filters, and a switch that switches between the output from the still image frame buffer and the output from the first still area filter and the first moving area filter. means, when a still image is requested, after all of the field signals being written to the frame buffer have been written, the writing of the next subsequent field signal is stopped, and then the second still area filter and the above Second
The moving area filter performs interpolation processing, the resulting data is stored in a still image frame buffer, and the stored data is output by switching the above-mentioned switch means.

[Examples] Examples of the present invention will be described below. 1st
The figure shows an example thereof. In this embodiment, as still image filters, a still area filter 10 that performs pixel data interpolation processing on the previous two fields and a moving area filter 11 that performs interpolation processing only on the current field are used. Then, the output is written to the still image frame buffer (memory) 13 via the pixel switch 12, and the read output from there is sent to the output signal processing section 7 by the switch 14.
I sent it to .

Now, the filters 10 and 11 of this embodiment are for still images, and there is no need for real-time processing (processing performed within the first time period). Therefore, when a stop request signal is received from the viewer, the image signal is written to the frame buffer 3 until the end of the field being received at that time, and subsequent writing to that buffer 3 is stopped. . Then, filtering processing is executed using the still area filter 10 and the dynamic area filter 11 added in this embodiment. The processing in the filters 10 and 11 is non-real-time processing (processing performed within a second time period that is longer than the first time period), and can be processed by extremely simplified hardware or software. Then, the processed image signal is sent to the pixel switch 13.
The still image frame buffer 13 is sent to the still image frame buffer 13 to start writing. The pixels for which writing has been completed are replaced with those that have been subjected to timely moving image processing by the switch 14, and then output.

〔Effect of the invention〕

As described above, according to the present invention, when an image is held still, non-real-time filtering processing (processing performed within the first time period) that is different from normal real-time filtering processing (processing performed within the first time period) is performed. Since the processing performed within the time period 2) is performed, a clearer still image can be reproduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a filtering processing section according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the same section in a conventional method. DESCRIPTION OF SYMBOLS 1... Television signal input section, 2... Input signal processing section, 3... Frame buffer, 4... Still area filter, 5... Moving area filter, 6... Pixel switch, 7... Output signal processing section , 10... Still area filter, 11... Moving area filter, 12... Pixel switch, 13... Still image frame buffer,
14...Switch.

Claims (1)

[Scope of Claims] 1. Input pixel signals are accumulated in a frame buffer, and pixel data interpolation for a still area is performed by a first still area filter, and pixel data interpolation for a moving area is performed by a first moving area filter, respectively. In a television receiver that processes and reproduces data within a time period of a second moving area filter that inputs the output of the frame buffer and interpolates pixel data of a moving area by the second time-consuming process; the second still area filter; A still image frame buffer that stores data interpolated by two moving area filters, and a switch that switches between the output from the still image frame buffer and the output from the first still area filter and the first moving area filter. means, when a still image is requested, after all of the field signals being written to the frame buffer have been written, the writing of the next subsequent field signal is stopped, and then the second still area filter and the above Second
A television receiver characterized in that interpolation processing is performed by a moving area filter, data obtained by this is stored in a still image frame buffer, and the stored data is output by switching the above-mentioned switch means.