JPS6211380A - Converting method for picture signal - Google Patents

Abstract

PURPOSE:To improve the picture quality by so forming the titled method that an interlace/noninterlace picture signal is written in a memory in which picture information are writable according to their time sequences, and read out in accordance with the time sequence of either interlace/noninterlace picture signal to convert them. CONSTITUTION:A memory element M is composed of plural memory elements m1-mn. The first picture signal S1 (interlace or noninterlace) is written in the said element M via a serial-parallel converting part SP. The information is read out from the element M via a parallel-serial converting part PS< and the information is made to be the second picture information S2 (noninterlace or interlace). A write address generating part WA, a read address generating part RA are connected to the element M via a read/write exchange part EX. And the exchange part EX, according to the read/write timings, timely inputs respective addresses from the parts WA and RA in the memory M to switch between the respective pictures. In such way, the quality of the pictures is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image signal conversion method for converting an interlaced image signal into a non-interlaced image signal or vice versa.

[Background of the invention and its problems]

[Object of the invention] [Summary of the invention] [Embodiments of the invention] Next, an embodiment of the image signal conversion method according to the invention will be described.
It is based on drawings.

FIG. 5 schematically shows image information in pixel units (actually, one screen worth of information can be stored).The read/write switching unit Ex is connected in parallel to each memory element !111 to mf1. , n-bit information of any pixel can be read and written at once.

The serial/parallel converter SP and the parallel/serial converter PS are effective when image signals are transferred in serial, and the serial/parallel converter SP converts one serial word Sl into an n-bit parallel signal. , Conversely, the parallel-to-serial converter PS converts the R-bit parallel signal into a serial signal S2.

FIG. 3 shows an example in which the above embodiment is applied to interlace/non-interlace bidirectional conversion. (corresponding to the part where is displayed) is A.
/D converter and D/A converter are connected. Here, the video signal is often an analog signal, and the input terminal and output terminal of the image signal converter are connected to an A/D converter,
A D/A converter is often connected. The video signal on the input side of the A/D converter is switched to Sl or S2, and the clock of the A/D converter and D/A converter is switched to CLI or Cl using the clock changeover switch SWC.
It is possible to switch to any one of 3.

Sl is an interlace video signal, S2 is a non-interlace video signal, and their synchronization clocks are C.
When setting LI and Cl3, connect Sl to the A/D converter, and manually input the clock CLI to the A/D converter.
Connect S2 to the D/A converter and clock CL2
By inputting this into a D/A converter, an interlaced video signal can be converted into a non-interlaced video signal. Also S2
If you connect S1 to the A/D converter, input the clock CL2 to the A/D converter, connect Sl to the D/A converter, and input the clock CLI to the D/A converter,
A non-interlaced video signal may be converted to an interlaced video signal. That is, interlace and non-interlace bidirectional conversion is possible with a minimum configuration.

〔Effect of the invention〕

As described above, the image signal conversion method according to the present invention is capable of writing an interlaced image signal in a memory that can store image information according to its time series, and converting a non-interlaced image signal into an interlaced image signal according to its time series. It has this excellent effect.

[Brief explanation of the drawing]

FIG. 3 is a block diagram showing an application example of the embodiment, and FIG. 4 is a waveform diagram showing write and read cycles. ml, m2. ,,,+ mn memory element M
Memory Sl, S2
Video signal CT
Cycle time. US 31Xl -N (1) CA procedure amendment writing method) 1985//Month 22nd

Claims (4)

[Claims] (1) Prepare a memory that can store image information,
An image signal conversion method that writes image information corresponding to an interlaced image signal into a first-term memory according to the time series of the interlaced image signal, and reads out image information from the first-term memory according to the time series of a non-interlaced image signal. (2) The image signal conversion method according to claim 1, characterized in that a time difference greater than the memory cycle time is provided between memory writing and reading. (3) Prepare memory that can record image information,
An image signal conversion method that writes image information corresponding to a non-interlaced image signal into a first-term memory according to the time series of the non-interlaced image signal, and reads out image information from the first-term memory according to the time series of the interlaced image signal. (4) The image signal conversion method according to claim 3, characterized in that a time difference greater than the cycle time of the memory is provided between writing and reading of the memory.