JPH01110343A - Image centering correction device for TV endoscopes - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a centering correction device that realizes centering correction of an image in a TV endoscope using an address controller.

[Conventional technology]

As is well known, TV endoscopy displays images on an external TV monitor based on video signals from a scope that has a solid-state image pickup device such as a CCD at the tip of the end inserted into a body cavity or a device cavity. A mirror device has been put into practical use. In addition, this TV endoscope device is colored red (R) to improve resolution and image quality.

A green (G) and blue (B) frame sequential imaging method is adopted. In other words, as shown in FIG. 2, the R, G, and B plane 1 sequential video signals obtained by the solid-state image sensor 1 are subjected to preprocessing such as gamma correction and noise removal by the video processing circuit 2, and then processed into A/ It is digitized by the D converter 3 and sent to the frame memory 4- through the data bus selector 14-1.
1.4-2.4-3 are stored sequentially. 4-1 is the R signal memory with one side j! Of the video signals sent each time, only the R signal is stored. Similarly, 4-2 is G signal memo + J
, 43 is a B signal memory. Memorized R, G
, B each video data is stored in frame memory 4-1.4.
-2.4-3, the D/A converter 5
-1.5-2.5-3, the image is converted into analog data, is post-processed by the image processing circuit 6, and is displayed on the monitor 7. Here, 8 is a reference signal generator, which generates various synchronization signals synchronized with the video signal, and generates various synchronization signals that are synchronized with the video signal to drive the solid-state image pickup device 1. Video processing circuits 2, 6. Control signal generator 91 supplies image centering signal generator 11, respectively. Further, the control signal generator 9
Frame memory 4-1.4-2.4-3° A/D converter 3. D/A converter 5-1.5-2.5-3° controls address controller 10. address controller 10
are the addresses for writing and reading each video data to and from the frame memory 4-1, 4-2 and 4-3! Occur.

By the way, in the case of such a TV endoscope device.

The solid-state image sensor 1 is embedded in the tip of an elongated cylindrical scope, but since the solid-state image sensor is small, it is difficult to mount it to the scope with high precision.

Installation requires a centering correction function that electrically shifts and corrects one image vertically or horizontally to eliminate image centering errors caused by errors. To achieve this centering correction function.

Conventionally, the phase of the horizontal synchronizing pulse and vertical synchronizing pulse generated by the reference signal generator 8 is shifted by one image centering correction signal generator 11 as shown in FIG. address controller 1
I took a method to control 0. That is, in FIG. 3, the horizontal synchronizing pulse (a) is a pulse shifted by Y horizontal direction correction amount Δχ (b) and the vertical synchronizing pulse (c) is the pulse (d) shifted by Y vertical direction correction amount ΔY. Therefore, the control signal is generated. Vessel 9. It controlled the address controller 10.

Note that as specific means for realizing this, a time constant circuit using a resistor and a capacitor, a circuit using a counter and a flip-flop, etc. are adopted.

[Problem that the invention seeks to solve]

As described above, the above-mentioned TV endoscope apparatus realizes image centering correction by shifting the phases of the horizontal synchronization pulse and the vertical synchronization pulse, but has the following drawbacks.

(If a 11 time constant circuit is used, the time constant changes due to temperature changes, resulting in poor centering correction stability.

(2) In the case of a circuit using a counter and a flip 70 tube, the scale of one circuit is somewhat large, and there is a problem of high cost.

In order to solve these drawbacks, the present invention aims to perform centering correction stably and inexpensively.

[Means for solving problems]

In order to achieve the above object, the present invention uses address controllers that generate addresses for writing and reading into a frame memory by arranging address controllers with preset functions for writing and reading, respectively. , writing and reading are accessed using separate addresses. In other words, the read via address is shifted in a desired direction relative to the write address. Furthermore, a digital switch for adjusting the preset value is provided, and the preset value can be changed and set by switching the digital switch for adjustment.

[Effect]

As a result, in the memory space of each frame memory. Only the amount of deviation between the write area and read area.

Since the read image moves, it is possible to easily and stably perform image centering correction.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, the same parts having the same functions as those in FIG. 2 are designated by the same reference numerals, and their explanations will be omitted.

FIG. 1(a) shows a schematic configuration of one embodiment, and lO' is an address controller having a preset function.

FIG. 1) is a detailed block diagram of this address controller 10', and 12-1 indicates each frame memory 4-1 to 4-4.
12-2 is an address counter with a preset function that generates a row address for writing video data into frame memories 4-1 to 4-3. This is an address counter with an attached address.

Further, 12-3 is an address counter with a preset function that generates a column address for writing data to each frame memory 4-1 to 4-3, and 12-4 is an address counter for each frame memory 4-1 to 4-3. This is an address counter with a preset function that generates a column address for reading data from 4-3. 13-1.13-2 and 13-3.13-4 are address counters 12-1 and 12-2.12-, respectively.
This is a digital switch for setting the preset value of 3.12-4. 14 is an address counter 12-1.
12-2, 12-3, and 12-4 is an address bus selector that selects the generated address and supplies it to each frame memory 4-1 to 4-3.

This operation will be explained below with reference to FIGS. 1 and 4.

FIG. 4(a) is a schematic diagram showing the state of the memory space of each frame memory 4-1 to 4-3 when centering correction is not performed. In this case, 9 for memory space a
Both writing and reading images.

1 because it starts from the address O (Xo, Yo) point
Images are written to and read from the area.

That is, at this time, the digital switch 13-1.13-
2 is set to a value corresponding to address value YO, digital switch 13-3.13-4 is set to a value corresponding to address value XO, and address counter 12-1.12-
2 loads the value YO of the digital switch 13, -1.13-2, as a preset value by the vertical synchronizing pulse VD supplied from the control signal generator 9, and by the horizontal synchronizing pulse HD also supplied.

The generated address values are sequentially counted up from YO. On the other hand, address counters 12-3 and 12-4.

Digital switch 13-3 by horizontal synchronization pulse HD
．． The value Xoy of 13-4 is loaded as a preset value, and address values generated by 1 by the horizontal sample clock HCLK are sequentially counted up from XO.

41) is a schematic diagram showing the state in the memory space when centering correction is performed. In this case, writing one image to memory space a is at address P(Xl, Yt
), one image is written in area C. That is, at this time, the digital switch 13-1 changes to the value corresponding to the address value Y1, and the digital switch 13-3 changes to the value corresponding to the address value X1.

m→− is set, and the address counter 12-1 is
The value Y1y of the digital switch 13-1 is loaded by the vertical synchronizing pulse VD, and the address value generated by the horizontal synchronizing pulse HD is sequentially counted up from Y1. The address counter 12-3 is.

The value X1 of the digital switch 13-3 is loaded by the horizontal synchronizing pulse HD, and the address value generated by 9 from the horizontal sample clock HCLKK is counted up by X1 to the 111th order. One-sided image reading is performed at address Q (Xo, Y
o) Image information in the area is read out since it starts from point. That is, at this time, the digital switch 13-2
is the value corresponding to the address value Yo, and the digital switch 1 is set to the value corresponding to the address value Yo.
3-4 is set to a value corresponding to the address value Xo, and the address counter 12-2 loads the value Yo of the digital switch 13-2 by the vertical synchronization pulse VD, and the address value 9 generated by the horizontal synchronization pulse HD. are sequentially counted up from YO, and the address counter 12-4 is
The value Xol of the digital switch 13-4 is loaded by the horizontal synchronizing pulse HD, and the address values generated by 9 from the horizontal sample clock HCLKK are sequentially counted up from XO. With the above operation, each frame memory 4-1 to 4
For center point 5 (X2.Y2) of writing area C of -3,
Since the center point T (X3.Y3) of the readout area is shifted by X2-X3 in the horizontal direction and Y2-Ya in the vertical direction, the frame memories 4-1 to 4
-3 is controlled (X2-Xa'.

It is possible to shift the image by one amount corresponding to Y2-Y3), that is, to correct the centering of the image.

Here, the centering correction amount is determined by the digital switch 13-1.
．． Any centering correction can be made by adjusting the value corresponding to the write start point address value set in 13-3 and the value corresponding to the read start point address value set in digital switch 13-2.13-4. You can get the amount.

In this example, as is clear from Fig. 4 (can),
Image information cannot be obtained at the left end and upper end of the read image, but the image normally observed with an endoscope is the center of the TV monitor screen, and no image information can be obtained at the periphery of the 9 screen. However, there is no practical problem.

In addition, in the two embodiments, there is a digital switch for preset settings! I used this for example.

It may be set to a fixed value using a pull-up resistor, a pull-down resistor, etc., or it may be possible to make only the write start address variable using a digital switch, and set the read start address to be fixed.

[Fruits and Vegetables of the Invention] According to the present invention, a simple centering correction circuit is not required, and by providing means for controlling the frame memory so that the image writing and reading areas are different from each other, a simple centering correction circuit is not required. With this configuration, a stable centering correction function can be realized at low cost. Furthermore, by using a digital switch to set the writing and reading start points in the frame memory, the amount of centering correction can be easily changed.

[Brief explanation of the drawing]

Figure 1 shows a TV with a centering correction function according to the present invention.
FIG. 2 is a block diagram showing the overall structure of the endoscopic steel, FIG. 2 is a block diagram showing the structure of a conventional example, FIG. 3 is a timing chart thereof, and FIG. 4 is an explanatory diagram of the operation of the present invention. 1... Solid-state image sensor, 3... A/D converter, 4-1゜4-2.4-3... Frame memory, 5-1.5- 2゜5-3...D/A converter, 7...TV monitor, 8...Reference signal generator, 9...Control signal generator , 10'...
...Address controller with preset function, 1
2-1 to 12-4 Address counter, 13
-i~13-4...Digital switch, 14.
...Address bus selector. J

Claims (1)

[Claims] 1. Capturing a subject image with the same body image sensor, writing the obtained red (R), green (G), and blue (B) video signals into the corresponding frame memories, and storing the video data stored in each frame memory. A TV endoscope apparatus for obtaining a readout color video signal includes an address controller that generates an address that is relatively shifted by a desired amount and in a desired direction between the write address and the readout address to each frame memory, and this The TV is characterized in that centering correction of the readout image is performed by a configuration in which each of the frame memories is controlled according to an address generated by the TV.
Image centering correction device for endoscopes.