JPH0194767A - Image contour correction device for TV endoscope - 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 an image contour correction device for generating a contour correction signal in a TV endoscope.

[Conventional technology]

As is well known, a solid-state imaging device such as a COD is placed at the tip of the insertion portion into a body cavity or a cavity of a device or the like.

A 5KL TV endoscope has been put into practical use that displays images on an external TV monitor based on the video signal. Further, as a device for correcting the outline of an image of such a TV endoscope, a device as shown in FIG. 2 has been considered. That is, in FIG. 2, the frame-sequential video signal obtained by the solid-state image sensor 1 is subjected to processing such as gamma correction and noise removal by the amplifier 2, then AM modulated by the modulator 11, and horizontally by the delay device 13-1. The scanning period is delayed (hereinafter referred to as "IH delay"). One of the signals obtained by the delay device 13-1 is demodulated by the low-pass filter 12-2 to become an IHH extended signal, and the other is the signal obtained by the delay device 1.
IH is further delayed by 3-2.

It is demodulated by the low-pass filter 12-IK and becomes a 2H delay. Here, the IHH delayed signal, the 2H delayed signal, and the signal before modulation (hereinafter referred to as "OH delayed signal") are input to a vertical contour corrector 7 having a well-known configuration, and the IHH delayed signal is input to a horizontal contour corrector 8. Ru. The contour correction signals generated by the vertical contour corrector 7 and the horizontal contour corrector 8 are added by an adder 9-1, and further.

The adder 9-2 adds it to the IHH extended signal, inputs it to the A/D converter 3, and converts it into a digital signal. By the way, the signal obtained from the solid-state image sensor 1 is a red video signal (hereinafter referred to as "R").
This is a frame sequential combination of a green video signal (hereinafter referred to as "G signal"), and a blue video signal (hereinafter referred to as "B signal"), and this frame sequential signal is subjected to the above processing. Strained,
R signal memory 4-1.0 signal memory 4-2. It is stored in the B signal memory 4-3. Furthermore, the outputs of the R, G, and B signal memories 4-1, 4-2, and 4-3 are as follows.

The signals are converted into analog signals by D/A converters 6-1, 6-2 and 6-3, and images are displayed on the TV monitor 10.

[Problem that the invention seeks to solve]

In this method, the above-mentioned image contour correction device for a TV endoscope generates nine contour correction signals by analog processing, and therefore has the following drawbacks.

1. Gain adjustment of modulator 11 is required.

2. S/N deterioration of the video signal due to leakage of modulation frequency.

3. In order to ensure the operational stability of each circuit, the scale of each circuit is critical.

The disadvantages are that the performance deteriorates and the cost increases. In order to solve these drawbacks, the present invention aims to generate nine contour correction delay signals through digital processing, improve performance, and reduce cost.

[Means for solving problems]

In order to achieve the above object, the present invention provides a memory having a buffer function, for example, first in first out (FIR, ST IN puts TOUT).
memory (hereinafter referred to as "FIFO memory").

They are arranged after the R signal memory, the B signal memory, and the q signal memory, and at the same time, they sequentially store the video signal information for the IN, and at the same time sequentially output the video signal information stored at that time before the IN. An object of the present invention is to provide an image contour correction device for a TV endoscope that digitally generates a correction delay signal.

〔Example〕

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

In Figure 1, the same parts that have the same effect as in Figure 2 are:
d5-1. is indicated with the same reference numeral and the explanation thereof is omitted.
5-2.5-3.5-4, Sequentially stores IN video data in FIFO memory, and simultaneously.

The video data stored at that time before IN is sequentially output. Therefore, the FIFO memory output is
The signal is delayed by H. 6-1.6-2.6-3.6
-4 and 6-5 are D for IH delayed R signal, respectively.
/A converter, ]H delayed G signal D/A converter, I
1)/A converter for H-delayed B signal, 2H-delayed D/A converter for G signal, and D/A converter for OH-delayed G signal.
It is an A converter. 9-2.9-3.9-4 is an adder which adds the contour correction signal and the IHH spread signal of each video signal to perform nine contour corrections.

This operation will be explained below with reference to FIGS. 1 and 3. Obtained from solid-state image sensor 1. The field sequential R,, B, and G signals shown in FIG. 3(a) are digitized by the A/D converter 3, and the R signal data is sent to the R signal memory 4-1, and the B signal data is sent to the B signal memory. Go to 4-3.

Further, the G signal data is stored in the G signal memory 4-2. At the same time, each memory outputs the currently stored data as shown in FIGS. 3(b), (C), and (d).

The G signal data (hereinafter referred to as OH slow G data) shown in FIG. 3(d) is stored in the FIFO memory 5-2 as shown in FIG.
This results in IH delay G data as shown in e).

Similarly, the R signal data becomes IH delayed R data and IH delayed B data by the FIFO memory 5-1 and the B signal data by the FIFO memory 5-3, respectively.

The IH delayed G data is further converted into 2·H delayed G data as shown in FIG. 3(f) by the FIFO memory 5-4. Here, IH delay R data.

IH delay B data, IH delay G data, OH delay G data, and 2H delay data are each sent to D/A converter 6-1.
6-3.6-2. 6-5. It is converted into an analog signal by 6-4. OH delay flaw signal converted into analog signal
IH delay flaw signal and 2H delay delay popular belief are 9. Well-known vertical contour corrector 7. A vertical contour correction signal as shown in FIG. 3(b) is generated. On the other hand, the IH delayed G signal and, if necessary, the IH delayed R signal are input to a well-known horizontal contour corrector 8 to produce a horizontal contour corrected signal. The vertical contour correction signal and the horizontal contour correction signal are added by an adder 9-1 to produce one contour correction signal. This contour correction signal is added to the IH delayed R signal, LH delayed G signal, and IH delayed signal using adders 9-2.9-3.9-4, respectively.

Contour correction is performed.

As explained above, the characteristic configuration of the nine embodiments is as follows.

The purpose is to digitally generate a delayed signal, which is the basis for creating one contour correction signal, using a FIFO memory.

In this embodiment, a FIFO memory is used, but the present invention is not limited to this, and in response to sequential storage of IH worth of video data, corresponding video data stored at that time from a predetermined period ago can be sequentially stored. Output.

Memory means having a buffer function for obtaining a delayed output for a predetermined period with respect to an input can be applied.

Further, in this embodiment, the vertical contour correction signal is generated from the G signal, but the present invention is not limited to this.

It may be generated using an R signal, a B signal, or an appropriate combination of G, R, and B signals.

By digitally delaying the output data using a FIFO memory, it is possible to obtain a vertical delay signal for contour correction without the need for a modulator, etc. 87N deterioration can be prevented. In addition, digital processing eliminates the need for each circuit to be adjusted.

Even if the circuit scale is small, operational stability of each circuit can be ensured, so costs can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an image contour correction device for a TV endoscope according to the present invention, FIG. 2 is a block diagram showing a conventional image contour correction device, and FIG. 3 is a time chart of this embodiment. It is. 1...Solid-state image sensor, 2...1 amplifier, 3...
・A/D converter, 4-1...R signal memory,
4-2...Q signal memory, 4-3. Song/B signal memory, 5-1.5-2゜5-3.5-4...
FIFO memory, 6-1.6-2゜6-3.6-4.6
-5...D/A converter, 7...Vertical contour corrector, 8...Horizontal contour corrector, 9-1.9
-2. 9-3. 9-4... Adder, 10.
...TV monitor. Sacrifice'5@

Claims (1)

[Claims] 1. In an image contour correction device for a TV endoscope that captures a subject image with a solid-state image sensor, adds a contour correction signal to the video signal, and displays the image on a TV monitor, for creating a vertical contour correction signal. An image contour correction device for a TV endoscope, characterized in that the delayed signal is generated by a digital memory means that performs a delay buffer operation for a predetermined period.