JPS5842377A - Picture compensation system - Google Patents

Abstract

PURPOSE:To obtain a picture easy to see, by displaying a picture element in omitting and erasing a point having a defect, if the element has the defect on one horizontal scanning line. CONSTITUTION:Picture data are written in a picture memory having an address corresponding to a screen. Data (a) for one horizontal scanning line's share are read out from the memory. If picture elements D, E, I, J and K which do not reach a prescribed level are found out during one horizontal scanning period, the address conversion to the memory is performed to gather defective picture elements to ends 9-13 of the scanning line. As a result, the presence of unsightly parts at the center of the screen can be prevented. In an optical picture transmission by means of an optical fiber cable, if defects are caused due to open cables, the picture can be displayed by excluding the defective parts.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a correction method for dividing 1 into the F2 of optical 1iii1jl sent via an optical cable consisting of an optical fiber bundle. FIG. 2 is a diagram explaining the principle of conventional optical image transmission. In the figure, 1 is an optical cable consisting of an optical fiber bundle (bundle of optical fibers), F is its tip, and R is its rear end. The optical image is transmitted at the leading end F and the trailing end R.
A cable l consisting of a bundle of optical fibers arranged so that each fiber occupies the same geometric position with respect to each other.For example, it is a cable l that is made of an optical fiber bundle arranged so that each fiber occupies the same geometric position. The other end face Rj (to create an optical image) is fed by 5K.

Such an optical cable 1 must be arranged in a pattern 5 such that each fiber at both ends occupies the same geometric position.

By the way, when manufacturing a cable with large dimensions or a large number of fibers, it is possible to twist individual fibers or bundles of fibers together for convenience in handling the cable by winding it around a drum or the like. Efforts are being made to make it flexible.

However, when fibers are twisted together in this way, the geometric positions of each fiber at both ends are inevitably not the same. Under these circumstances, conventional optical transmission is
Short, small-sized fiber bundles were used as fiberscopes (for example, endoscopes) for medical purposes such as observing the inside of the stomach and canal.

On the other hand, there is a demand for using optical transmission technology using optical cables to monitor conditions in places that are difficult for humans to access, such as inside nuclear reactors and blast furnaces, from a remote location.
For the reasons mentioned above, it is not possible to manufacture long optical cables in which the geometrical positions of the fibers at both ends are the same, making it difficult to meet the above requirements.

The inventor of the present invention has overcome these difficult circumstances and created a bidirectional display device that makes it possible to transmit and display optical signals even using optical cables that are twisted together to provide flexibility and have sufficient length. The authors have proposed this in separate patent applications (Japanese Patent Application No. 56-68189 and Japanese Patent Application No. 56-68190).
This will be explained next.

FIG. 2 is a block diagram showing a dual display device proposed by the present inventors. In the figure, 21 is an object to be monitored, 22 is a lens, and 2 is a long flexible optical cable. 10 is a photoelectric conversion circuit, but it is actually a color TV camera consisting of a camera tube and a control unit. (green), B (true) This is a circuit that converts into an electrical signal. The A/D conversion circuit 12 converts the analog RGB electrical signal from the photoelectric conversion circuit 10 into a digital KGB signal of 64 levels (6 bits) of density for each pixel with a resolution of 512 (dots) x 512 (dots), for example. This is a circuit that does this. The conversion operation of the address generated from the two-dimensional coordinate generation circuit 11 is performed at an extremely high speed.

The two-dimensional coordinate generation circuit 11 generates a two-dimensional address (X coordinate address and Y coordinate address) for each pixel (dot) when the photoelectric conversion in the circuit 10 is divided into 512 (dots) x 512 (dots). It is a circuit. These two-dimensional coordinate addresses are generated so that the display screen can be scanned correctly. The write control circuit 13 is a circuit that causes the data buffer memory 14 to store pixel information (RGB signals and their gradation information) digitized for each pixel using the A/D conversion circuit 12 .

The coordinate conversion circuit 15 connects the optical cable 2 [ll terminal RK
This is a conversion table prepared in advance that can convert the position coordinates of each fiber at the object side terminal F to the position coordinates of each fiber at the object side terminal F. This coordinate conversion circuit is described in detail in the above-mentioned patent application, so please refer to it if necessary.

The memory 16 includes the coordinate conversion circuit 1. ．． In step 5, the information after coordinate transformation is stored in the order of scanning addresses.
This is refresh memory. TV synchronized flight number generation circuit 17
is horizontal when scanning on CRT20,
This is a vertical synchronization signal generation circuit. The read control circuit 18 is
While synchronizing with the TV synchronization signal from the circuit 17, the information written in the refresh memory 16 is read out and the D/A
This is the circuit for reading out to the converter 19. The D/A conversion circuit 19 is read out from the refresh memory 16 and the input digital pixel signal string is converted into a color video signal and sent to the CRT.
This is a circuit that inputs to 20.

The operation is probably already clear, but I will briefly explain it. The body of the object to be monitored 21 located in a place where it is difficult for humans to approach, such as inside a nuclear reactor, is interred at the tip F of the optical cable 2 using a lens 22 or the like. The optical signal is transmitted through an optical cable 2 to a photoelectric conversion circuit 10.

It is converted into an electrical signal under the control of the coordinate generation circuit 11, and converted into a digital signal in the A/D conversion circuit 12, and then written into the data buffer memory 14 under the control of the write control circuit 13. It will be done.

Information read out from the data buffer memory by a readout control means (not shown) is address-converted in the coordinate conversion circuit 15 according to a predetermined coordinate relationship between the positions of the fibers at the tip F and the rear end R of the optical cable 2. Written to fresh memory 16. The read control circuit 18 reads information from the refresh memory l6 under the control of the TV synchronization signal generation circuit 17, and reads information from the D/A conversion circuit 19.
After converting the signal into an analog signal, the signal is input to the CRT 20 and displayed. As a result, an optical image of the object to be monitored 21 can be displayed on the CRT 20 and monitored.

As described above, the image display device proposed by the present inventors has the following problems. That is, since the optical cable 2 is long, if there is a fiber that is broken in the middle, only that part will be displayed in black and the image quality will deteriorate. In addition, the optical cable 2 is manufactured by making a unit of a fiber bundle consisting of a number of fibers, and further twisting and drawing a plurality of these units, but when looking at the optical image at the end of the cable,
The disadvantage is that the light transmission level is reduced in the peripheral areas of each unit, creating gaps that make it difficult to see the image.

FIG. 3 is a schematic diagram of an optical cable end for explaining this situation. In the figure, 3 is a fiber bundle unit. In other words, the optical cable 2 consists of a large number of fiber bundle units)
3a, 3b, 3c, etc., are mutually glued together, so a shadow appears at the adhesive part l. Also, unit 3x indicates a unit that has broken due to breakage, etc. The entire unit part is displayed in black.

The unit is as shown in Figure 4.
The unit is constructed by laminating several layers of (a collection of multiple phyno sheets), and each unit made in this way has 7 parts as shown in Figure 5. Unit 31 and other units) 3b are adhered with adhesive H, and an optical cable is constituted by a collection of a large number of units thus obtained.

Each fine dot in a unit corresponds to a pixel (dot), but due to the structure, it is often the case that the unit breaks, so in that case all pixels constituting the unit are displayed in black.

The present invention has been made in order to eliminate the above-mentioned drawbacks in the image display device (though not limited to) proposed by the present inventors, and therefore, the purpose of the present invention is to Another object of the present invention is to provide a correction method for providing an easy-to-see image by correcting shadows between units and black spots caused by broken fibers that occur on the image-receiving end face of an optical cable.

The main point of the configuration of the present invention is to determine the level of data read from the memory in an image display device comprising a memory for storing image data and a rask scanning type display for displaying the data read from the memory. means for detecting the address of a defective pixel for which a predetermined level of readout data cannot be obtained as a result of the determination; and each normal pixel on a scanning line that will include the defective pixel when displayed on a display. read from the memory. The point is that 5K data is displayed on the display using the new address.

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 6 is a diagram explaining the principle of the present invention. In other words, Fig. 6 (P) is an explanatory diagram showing one scanning line in a rask scanning display as consisting of 13 pixels A to M, where the large pixel is at address 1, the B pixel is at address 2, and the C pixel is at address 2. No. 3 J
Similarly, it is assumed that the L pixel is located at address 122 and the M pixel is located at address 133. At this time, D, E and I
, J jK are defective pixels due to shadows, disconnections, etc., making the screen difficult to see.

In this case, as shown in FIG. 6(b), the principle of the present invention is to gather all the defective pixels at, for example, the right end of the scanning line, thereby making the screen easier to see. Initially, as shown in Figure 6, defective pixel A was located at address 4, and defective pixel E was located at address 5, but the address of the defective pixel was assumed to be vacant, and normal pixel F,
Since G and H are incremented sequentially, F, G, and H move by 4 and 5.6 MK, respectively, as shown in FIG. 6 (b).

Similarly, there are normal pixels, M is defective pixels, B, I, J, K.
Since the address is skipped and carried forward, the initial address 12.133 is carried forward to address 7°8.

Such address conversion involves considering a memory that has an address assignment that corresponds one-to-IK to the address assignment on a rask scanning screen, and moves the F pixel that was initially at address 6 to address 4 within this memory. 5 Giji elements at number 7
This corresponds to displaying the pixels sequentially read out from the memory on the screen in address order after moving them to the address, so it can be easily executed as long as the address of the defective pixel can be detected.

FIG. 7 is a schematic diagram of a screen when the present invention is applied to the cable end as shown in FIG. 3. By comparing the two figures, it can be seen that by implementing the present invention, the net-like shadow that would otherwise appear in the center of the screen is significantly reduced. In addition, in Figures 3 and 7, defective pixels are exaggerated and drawn in a large size to make the figures easier to understand, but in reality, the ratio of defective pixels to normal FIiJ elements is quite small, so it is easier to see. will be significantly improved.

In addition, if the present invention is implemented, the correct positions of both images will be displayed partially shifted due to address conversion, which may result in slight distortion, but the actual image quality deterioration due to this will be The above is not enough to be a problem.

FIG. 8 is a block diagram showing one embodiment of the present invention. The difference from the conventional display device shown in FIG. 2 is that the level determination circuit 31. The difference is that a first address register 32, a second address register 33, and an arithmetic circuit 34 are added as shown. Nothing else has changed.

The operations of the various circuits added will now be described.

In FIG. 8, the coordinate conversion circuit 15 is unnecessary if the optical cable 2 has the same geometrical arrangement of fibers at its tip P and rear end. The output of the coordinate conversion circuit 15 or the output data of the data buffer memory 14 is determined by a level determination circuit 31 as to whether or not it is at a predetermined level or higher. When it is determined that the output data is below a predetermined level, the address of the defective pixel having the data is detected and stored in the first address register 32. On the other hand, data of normal pixels whose level is above a predetermined level is written to the refresh memory 16 as is. Thereafter, the pixel addresses for one scanning line are sequentially output from the refresh memory 16 to the second address register 33. Then, in the arithmetic circuit 34, from the address of the defective pixel given from the ``th'' address register 32 and the address of pixels for one scanning line given from the second address register 33, the calculation circuit 34 uses The arithmetic operation for address conversion is performed as described above, and pixel data for 1 scan and 247 minutes is written anew into the refresh memory 16 using the new address obtained thereby.

After repeating the above and writing all the data for one screen to the refresh memory 16 using the new address,
The subsequent operation is the same as that of the conventional device shown in FIG.

As described above, the present invention has the advantage that in an image display device, it is possible to provide an easily viewable image by removing black spots and the like caused by breakage of the shaded fiber between the 7-eye unit and the unit that constitute the optical cable. There is.

[Brief explanation of drawings]

Fig. 1 is a diagram explaining the principle of conventional optical transmission using optical fibers, Fig. 2 is a block diagram showing an image display device proposed by the present inventors, Fig. 3 is a schematic diagram of the end of an optical cable, and Fig. 4 is a perspective view of the fiber sheet, FIG. 5 is a perspective view showing the bonding structure between the fiber bundle unit and the unit, and FIG. 6 (A)
, ←) is a diagram explaining the principle of the present invention, FIG. 7 is a schematic diagram of a screen when the present invention is implemented on the end of an optical cable as shown in FIG. 3, and FIG. 8 is a diagram showing an embodiment of the present invention. FIG. Description of symbols 1... Optical fiber bundle, 2... Flexible long optical cable, 3... Fiber bundle unit,
4...Fiber sheet, 10...Photoelectric conversion circuit, 11...Coordinate generation circuit, 12...
...A/D conversion circuit, 13...Write control circuit, 14...Data buffer memory, 15...
. . . Coordinate conversion circuit, 16 . . . Refresh memory, 17 . . . TV synchronization signal generation circuit, 18
...read control circuit, 19...'D/A
Conversion circuit, 20...CRT, 21, object to be monitored, 22...lens, 31...level determination circuit, 32...address register, 33・
... Address register, 34 ... Arithmetic circuit No. J and No. 6 Fig. 1 # 77-345 ≦ 7 1? q10 II
12 /jFigure 7

Claims (1)

[Claims] l) In an image display device comprising a memory for storing image data and a raster scanning display for displaying data read from the memory, the level of data read from the memory is determined. means for detecting an address of a defective pixel for which a predetermined level of bladder ejection data could not be obtained as a result of the determination; Equipped with a four-way address conversion function that converts the address of each normal pixel into a new address obtained by sequentially packing and rearranging each normal pixel in one direction on the scan twin, considering the address of a defective pixel as vacant. . 5. An image correction method characterized in that the data read from the memory is displayed on a display according to the new address.