JPS58166878A - Picture monitor device - Google Patents

Abstract

PURPOSE:To display with no distortion the data given from a detector which has an arc-shaped scanning, by generating an address corresponding to the arc- shaped scanning in the form of an access address of a feed memory. CONSTITUTION:An access is given to a memory M2 in an arc-shaped scanning mode, and an address that is an output of the M2 is given in the form of a writing or reading address. A writing address control circuit G reads the address sent from a switch S in a reading mode of a feed memory M3 and transmits it to a reading control circuit C1 as an address. Receiving this reading address, the circuit C1 gives an access to the M3 and delivers the data corresponding to the address to a D/A converter D in the form of a reading data (f). The converter D gives a D/A conversion to the data (f) and delivers it as an analog video signal. This video signal is sent to a CRT (not shown in the figure) via a CRT control circuit (not shown in the figure) to display a requied picture.

Description

[Detailed description of the invention] The present invention relates to an image monitoring device.

It takes about 20 to 30 seconds for one screen of images sent from earth observation satellites, etc., and field memory is required to store the data in order to display them on an ordinary television screen at 60 frames per second. However, as shown in FIG. 1(a), in the case of a type of detector that scans in an arc shape, data is stored in the field memory in the form of a curve scan. If the data in the field memory is displayed in a straight line on a monitor screen, the image will be displayed as shown in FIG. In the figure, A, BXCXD
indicate positions that correspond to each other. The occurrence of such distortion means that the reproducibility of images sent from the satellite deteriorates, which is not desirable.

An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide an image monitor device that can display data from a detector that performs arcuate scanning without distortion.

The gist of the present invention is that, by providing a control circuit that specifies the writing address of the memory in an arc shape when writing image data to the field memory, distortion does not occur on the screen even when the field memory is read in the scanning line direction as before. That's what I did. Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a diagram showing an embodiment of the image monitoring device of the present invention. The image monitor device of this embodiment has a field memory M
3. RO for inset address used during line scanning
M memory M1. Memory M2 which is a write address ROM used during arc sudayan, a continuous output control circuit CI, and an address counter C2 which provides a ROM address.
, a 4-inclusive address control circuit G, and a DA converter.

The digital image data (m-pit) a is data stored in the field memory M3, and the write destination address at that time is given from the control circuit G to the memory M1.
Enter any output address of M2. The switch S selects between the memory M1 and the memory M2. The memory M1 stores addresses for linear scanning, ie, rask scanning, rather than arcuate scanning. The memory M2 stores addresses for arc scan rather than rask scan. The address counter C2 is set by the scan start signal and counts the word clock signal C. Each time the word clock signal C is counted, the address counter C2 sends out the count value for each clock input as an address of the memory M1 or M2, and successively outputs the corresponding data, that is, the address of the memory M5. The scan start signal and the word clock signal C are synchronized with the digital image data a-co, which is write data. In particular, the scan start signal C is synchronized with the scan start of the image, and the word clock signal C is in a synchronous relationship that occurs at substantially the same time as the digital i [data a]. The switch S is turned on to 5tllll during normal scanning, and is turned on to the S side during arc scanning.

Selection of turning on the switches SO8, 1S is performed by means (not shown) for instructing normal scan or arc scan.

In the write mode, the write address control circuit G takes in the address sent out via the switch S, and stores it in the memory M.
Its main function is to provide write access. Another function is to provide the address sent from the switch S in the continuous output mode as a read address.

The write address control circuit G sends the address sent from the switch S during the read mode of the memory M3 to the read control circuit C1 as a continuous address. The continuation m111 circuit C1 receives this continuation address in the memory M.
3, and the data corresponding to the address is successively outputted to the DA converter as data f. The DA converter converts the data ft to DA and outputs it as an analog video gI (No. 11).This analog signal is sent to the CRT (not shown) through the CRT control circuit (not shown) and is displayed as necessary to display image scratches. The synchronizing signal e of the protruding control circuit C1ti is separated and output to the outside.

As is clear from the above description of the operation, during normal scan, ie, last scan, memory M1 is accessed, and the address that is the output of memory M1 is provided as the initial or subsequent address.

As a result, writing and continuous output are performed according to the normal scan. On the other hand, during arcuate scanning, the memory M2 is accessed, and the address that is the output of the memory M2 is provided as a write or read address. As a result, a series of compliments are made in accordance with the scan during the arc. Furthermore, it is important to know whether the contents stored in the memory M3 are linear scans or circular arc scans, and whether the contents stored in the memory M1. Since it can be handled independently of which of M2 is accessed (meaning that the selection of switch S can be done arbitrarily), the stored data and its access address are 4.
Allows for street selection.

In the same example, one field memory is used, but it is also possible to provide a plurality of field memories and use them for exclusive use for straight line scans and for circular arc scans. In addition, continuous output control 41 (b) path C
1 and the 1-write address control circuit (b) C2 may be integrated in terms of (b) circuit to form a successive write control circuit. Maku, memo! JM1. Although M2 has a ROM configuration, it has a RAM configuration, and as a result, there is an advantage that the address can be set arbitrarily.

According to the present invention described above, it has become possible to faithfully reproduce images.

[Brief explanation of the drawing]

g1 Figures (a) and (b) are explanatory diagrams of a conventional example, and Figure 2 is an embodiment diagram of the present invention. Ml, M2...Memory for write address, M3...
Field memory, C2...address control circuit, G...
-Write address control circuit, C1... Continuation control circuit. Agent Patent Attorney Tadashi Akimoto Figure 1

Claims (1)

[Scope of Claims] A field memory, an address generation means for generating an address for accessing the field memory, and a mode in which the generated address from the generation means is read. a memory control means for accessing the field memory as a write address and a succession address according to a succession mode, and writing or reading image data at that time;
and display means for displaying successive data from the field memory, and the address generation means:
An image monitoring device configured to generate an address corresponding to the arcuate scan as an access address of the field memory when the image data is data obtained by an arcuate scan.