JPS60264176A - Picture storage device - Google Patents

Abstract

PURPOSE:To increase imaginarily the resolution and to utilize the titled device even for broadcast by applying field/frame changeover as required to a data read from a memory storing only picture information for one field's share and an added synchronizing signal, and replacing them. CONSTITUTION:A memory controller 3 controls the operation of a memory and a synchronizing signal generator 4 in the field repetition or the operation of the memory and the synchronizing signal generator 4 at frame read by using a signal inputted from a field/frame changeover input terminal 102. That is, a detector 10 is controlled so that a vertical period counter 8 is counted up to 0-261 at field and the vertical period counter is counted to 0-261 in the 1st field, and to 0-262 in the 2nd field in frame, and field reproduction or pseudo frame reproduction is attaind by adding the output of a counter group to a 1-field memory 2 and the synchronizing signal generator 4.

Description

DETAILED DESCRIPTION OF THE INVENTION "Minute Hand for Industrial Use" The present invention relates to an image storage device that replaces the synchronization signal of a television signal read out from an image memory.

"Prior Art" Conventionally, an image storage device that stores one television signal has one
Field or 1 frame image memo + 7-1-SL
, 7J 2, 2゜Oi, kerah.

It is used in still image transmission devices used in conferences, etc. Signals from image storage devices such as frame synchronizers used in broadcasting stations are NTSC.

Since it is standardized as P'AL, a frame synchronization signal (1 frame, 525 rai/) is used as the synchronization signal. On the other hand, a still image transmission device is usually used to write one field of a television signal into a memory and transmit the written data to a remote location via a narrowband transmission line.The video output signal is a still image of one field. It is. In the case of a still image, if this □ signal is used as a frame synchronization signal and the 12th and 264th lines in Figure 3 are output as the same image, there is a drawback that flicker between fields becomes noticeable. A playback synchronization signal was used. That is, by performing non-interlaced reproduction of 262 lines per field, it was possible to make flicker less noticeable and to maintain continuity of color phase. However, when the TV output signal of a still image transmission device is recorded on a professional VTR,
When used in broadcasting stations, etc., the synchronization signal must be a frame synchronization signal. Furthermore, field playback had drawbacks such as insufficient resolution.

[Problems to be solved by the invention] The purpose of the present invention has been made in view of the above points.
It is an object of the present invention to provide an image storage device that can improve resolution in a similar manner and can also be used for broadcasting.

"Means for Solving Problems" According to the present invention, a one-field image memory is provided, the contents of which are repeatedly read out, and either a field repetition synchronization signal or a frame synchronization signal is transmitted as a synchronization signal. A selectable image storage device is obtained.

"Embodiment" Next, the present invention will be explained in detail with reference to the drawings showing the embodiment. FIG.゜An A/D converter that samples the input video signal and converts it into a digital signal 1.
1 field memory 2 that stores images for 1 field
．． 3. A memory controller that controls memory writing and reading and also performs memory addressing. A field /
Frame switching input terminal 102, synchronization signal generator 4.
A signal switcher that allows you to quickly change the synchronization signal 5. In order to convert a digital signal into an analog signal, an aD/A converter 6 and a television video signal output terminal 103 are constructed.

Next, the operation will be explained. The video signal input from the television video input terminal 101 is sampled by the A/D converter 1 and supplied to the 1 field memory 2. The 1-field memory 2 sequentially writes and stores one field of image information supplied from the SK/D converter 1 in response to a write command from the memory controller 3 at an address specified by the memory controller 3. . The stored image information is read out in address order according to a read command from the memory controller, and is supplied to the Hakugo switcher 5.

Here, the image information stored in the 1-field memory 2 retains the same information unless new information is written, so the same information is read out repeatedly. The memory controller 3 also has a field/7 frame switching input terminal 10.
The signal input from 2 controls whether the memory and synchronization signal generator a4 is operated by 7-yield repetition or the memory and synchronization signal generator 4 is operated by frame reading. When operating with field repetition, the memory is accessed repeatedly with 262 lines per field, and the vertical synchronization signal as synchronization signal data from the synchronization signal generator 4 is in phase with the horizontal synchronization signal for each field. It works like this. When reading a frame, the read image signal is read out from the memory in such a way that it is interleaved between fields as shown in FIG. , the vertical synchronization signal is in phase with the horizontal synchronization signal, and the second field operates so that the vertical synchronization signal is out of phase with the horizontal synchronization signal by half a horizontal synchronization signal. The image data read out from the field memory 2 and the data supplied from the synchronization signal generator 4 are used during the synchronization signal period and the vertical blanking period, and the data from the memory is used during the image period. The data that has passed through the output signal switcher 5 is sent to the D/A converter 6.
The signal is converted into an analog signal and output from the television screen video signal output terminal 103.

Next, as shown in FIG. 2, the memory control unit 3 includes a horizontal period counter 7', a vertical period counter 8 which increments sicrants by this carry output, and a count-up which counts up by the carry output of this vertical period counter. The field counter 9 and a group of the three types of counters described above are operated in a field (one field 262 lines) period, or
The decoder 10 is operated at a frame (525 lines per frame) cycle, and the decoder 10 is controlled by a field/frame switching control signal. It counts up to 261, and when it is a frame, the first field is the vertical period counter from 0 to 261, and the second field is 0.
By controlling the decoder 10 to count up to 262 and adding the outputs of this group of counters to the 1-field memory 2 and the synchronizing signal generator 4, field playback or pseudo frame playback can be performed.

"Effects of the Invention" As explained above, according to the present invention, even in an image storage device that has a memory that stores only one field of image information and repeatedly reads out the data stored in this memory, it is possible to use the memory. An image storage device that can pseudo-increase the resolution by changing the read data and the synchronization signal to be added by switching fields/frames as necessary, and also has the effect of being able to be used for broadcasting. can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram of a memory control section in FIG. 1, and FIG. 3 is a diagram showing scanning lines of a standard television signal. In the figure, 101... Television video signal input terminal, 102... Field/frame switching input terminal, 103... Television video signal output terminal, 1... ...A/D converter, 2...
1 Field memory, 3...Memory controller, 4...Synchronization signal generator, 5...Signal switcher, 6...D/A converter ,7...
...Horizontal period counter, 8...Vertical period counter, 9...Field period counter, 10...
····decoder.

Claims (1)

[Claims] an image memory for one field for storing an input television image signal; means for writing the input television image signal into the image memory; and a television image signal from the image memory at a television scanning speed. synchronization signal generating means for selectively outputting an orange field synchronization signal and a 7-frame synchronization signal based on field repetition; An image storage 1tc location characterized by comprising: means for changing the synchronization signal from the signal generating means.