JP2837884B2 - Electronic endoscope device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic endoscope apparatus provided with a plane-sequential imaging unit having a horizontal stripe-shaped color separation filter provided in front of a solid-state imaging device. .

[Prior Art] In recent years, endoscopy is possible in which a slender insertion portion is inserted into a body cavity to observe an organ in the body cavity, and, if necessary, various treatments are performed using a treatment tool inserted through a treatment tool channel. Mirrors are widely used. In addition, various types of electronic endoscopes have been proposed in which a solid-state imaging device such as a charge-coupled device (hereinafter, abbreviated as CCD) is provided as an imaging means at the distal end of the insertion portion, and image information is extracted as a photoelectrically converted electric signal. Have been.

As shown in FIG. 19, a first conventional endoscope apparatus includes:
An electronic endoscope 1 is provided. The electronic endoscope 1 has a slender, for example, flexible insertion section 2, and a large-diameter operation section 3 is connected to the rear end of the insertion section 2. A flexible universal cord 4 extends laterally from the rear end of the operation unit 3, and a connector 5 is provided at the tip of the cord 4. The electronic endoscope 1 is connected via the connector 5 to:
The light source device and a signal processing circuit are connected to a video processor 6 which is built in. Further, a monitor 7 is connected to the video processor 6.

On the distal end side of the insertion portion 2, a rigid distal end portion 9 and a bending portion 10 which can be bent rearward adjacent to the distal end portion 9 are sequentially provided. By rotating a bending operation knob 11 provided on the operation section 3, the bending section 10 is rotated.
Can be bent in the horizontal direction or the vertical direction. The operation section 3 is provided with an insertion port 12 communicating with a treatment instrument channel provided in the insertion section 2.

As shown in FIG. 20, a light guide 14 for transmitting illumination light is inserted into the insertion section 2 of the electronic endoscope 1. The distal end surface of the light guide 14 is disposed at the distal end 9 of the insertion section 2 so that illumination light can be emitted from the distal end 9. The incident end of the light guide 14 is inserted into the universal cord 4 and connected to a connector 5 provided at the end. In addition, the tip 9
Is provided with an objective lens system 15,
The solid-state imaging device 16 is disposed at the image forming position. This solid-state imaging device 16 has sensitivity in a wide wavelength range from the ultraviolet region to the infrared region including the visible region. The solid-state imaging device 16 is connected to signal lines 26 and 27.
27 is inserted into the insertion section 2 and the universal cord 4 and connected to the connector 5.

On the other hand, the video processor 6 is provided with a lamp 21 that emits light in a wide band from ultraviolet light to infrared light. As the lamp 21, a general xenon lamp, a strobe lamp, or the like can be used. The xenon lamp and the strobe lamp emit a large amount of ultraviolet light and infrared light as well as visible light. This lamp 21 is connected to a power supply 22
Is supplied with power. A rotary filter 24 driven by a motor 23 is provided in front of the lamp 21. In the rotary filter 24, filters for transmitting light in respective wavelength regions of red (R), green (R), and blue (B) for normal observation are arranged along the circumferential direction.

The rotation of the motor 23 is controlled by a motor driver 25 to be driven.

The light that has passed through the rotary filter 24 and is separated in time series into light of each wavelength region of R, G, and B is further incident on an incident end of the light guide 14, and is transmitted through the light guide 14. The light is guided to the tip 9 and emitted from the tip 9 to illuminate the observation site.

The return light from the observation site due to the illumination light is imaged on the solid-state imaging device 16 by the objective lens system 15, and is photoelectrically converted. This solid-state imaging device 16 includes:
A driving pulse from a driver circuit 31 in the video processor 6 is applied via the signal line 26, and reading and transferring are performed by the driving pulse. The video signal read from the solid-state imaging device 16 is
The signal is input to a preamplifier 32 provided in the video processor 6 or the electronic endoscope 1 via the signal line 27. The video signal amplified by the preamplifier 32 is input to a process circuit 33, subjected to signal processing such as γ correction and white balance, and is subjected to an A / D converter 34.
Is converted into a digital signal. The digital video signal is selectively stored in, for example, three memories 36a, 36b, and 36c corresponding to respective colors of red (R), green (G), and blue (B) by the selection circuit 35. It has become. The memory 36a, the memory 36
b, the memory 36c is read out at the same time, converted into an analog signal by the D / A converter 37, output as R, G, B color signals, and input to the encoder 38, and the NTSC composite signal is output from the encoder 38. Is output.

Then, the R, G, B color signals or the NTSC composite signals are input to a color monitor 7, and the color monitor 7 displays the observation region in color.

In the video processor 6, a timing generator 42 for generating the timing of the entire system is provided, and the timing generator 42 synchronizes the motor driver 25 and the driver circuit 31 with each other.

In the first conventional example, since a color video signal is generated from three color image signals which are sequentially captured under illumination of three colors of R, G, and B, when a moving object is captured, Displacement is likely to occur.

For this reason, in the second conventional example of JP-A-58-46926, cyan and yellow color transmission filters are arranged in the form of a mosaic or vertical stripes on the front surface of a solid-state imaging device, so that green and white filters are provided. By illuminating with light, a color video signal can be obtained.

[Problems to be Solved by the Invention] According to the second conventional example of JP-A-58-4926,
The occurrence of color misregistration can be reduced as compared with the first conventional example.

However, in the second conventional example, since a mosaic or vertical stripe filter is used, a moiré or a false color signal is easily generated, and therefore, it is necessary to further provide an optical low-pass filter.

This is because the resolution in the vertical direction is generally higher than that in the horizontal direction, so when using a mosaic or vertical stripe filter as described above, the vertical array components are moire or false colors. It may cause a signal. Therefore,
In order to remove moire or false color signals, it is necessary to provide an optical low-pass filter or the like.

Therefore, the number of components of the optical system at the distal end of the endoscope increases, which hinders downsizing or shortening of the distal end.

The present invention has been made in view of the above points, and has as its object to provide an electronic endoscope apparatus in which false colors are less likely to occur and color misregistration can be reduced.

[Means and Actions for Solving the Problems] In the present invention, a means for illuminating time-sequentially with two colors of illumination light and two or more types of horizontal stripe filters on the front surface of the solid-state imaging device are provided. An optical low-pass filter is not required, the color shift is small, and a false color signal in the horizontal direction is hardly generated.

EXAMPLES Hereinafter, the present invention will be described specifically with reference to the drawings.

1 to 4 relate to a first embodiment of the present invention, FIG. 1 is an overall configuration diagram of the first embodiment, FIG. 2 is a front view showing a rotary filter, and FIG. FIG. 4 is a front view showing a horizontal stripe filter provided on the front surface of the image sensor,
The figure is a diagram for explaining the operation of the first embodiment.

Components other than the rotary filter 53, which is a main part in FIG. 1, have the same reference numerals as those shown in FIG.

In the electronic endoscope device 51 of the first embodiment shown in FIG. 1, the rotary filter 53 in the light source device 52 has a green transmission filter 53G and an all-color transmission filter 53W as shown in FIG.
It is composed of Therefore, one rotation of the motor 23 emits green (G) and white (W) illumination light.

On the other hand, on the front surface of the solid-state imaging device 16 of the electronic endoscope 1, a horizontal stripe filter 54 is provided. As shown in FIG. 3, the horizontal stripe filter 54 has a configuration in which horizontal stripe color filters 54Yl and 54Cy which respectively transmit light in the yellow (Yl) and cyan (Cy) wavelength regions are alternately arranged. Each of the horizontal stripe color filters 54Yl and 54Cy is arranged so as to cover each pixel row in the horizontal direction.

By the rotation filter 53, the white light of the lamp 21 is converted into light of each wavelength region of green and white in time series,
The light is irradiated on one end face of the light guide 14 and is emitted from the other end face on the tip end 9 side to the observation site side.

The return light from the observation site due to the illumination light of each wavelength range in the time series is formed into an image on the solid-state imaging device 16 by the objective lens system 15 through the horizontal stripe filter 54, and is photoelectrically converted. This photoelectrically converted signal is supplied to a signal processing circuit 55.
And is input to the select circuit 35 via the preamplifier 32, the process circuit 33, and the A / D converter 34. By the selection circuit 35, two memories 36a and 36a corresponding to the respective colors at timings suitable for the respective color transmission filters 53G and 53W of the rotation filter 53.
It is selectively stored in 36b.

In other words, the memory 36a stores information transmitted through the horizontal stripe filter 54 on the front surface of the solid-state imaging device 16, that is, the color filters 54Yl and 54Cy under the green illumination light from the green transmission filter 53G of the rotation filter 53, in this case, the color filter. Five
Since 4Yl and 54Cy respectively transmit light in the green and red wavelength regions and light in the green and blue wavelength regions, all pixel green (G) signal information is stored.

On the other hand, the memory 36b stores information transmitted through the color filters 54Yl and 54Cy on the front surface of the solid acid image element 16 under white illumination light by the filter 53W of the rotation filter 53, that is, a line-sequential yellow (Yl) signal. , Cyan (Cy) signal.

The signal data stored in the memories 36a and 36b are read simultaneously. The signal timing at this time is shown in FIG.

FIG. 4A shows the output of the memory 36a, and FIG.
Indicates the output of the memory 36b.

The output of the memory 36b is input to the 1H delay line 56, and is delayed by 1H period, that is, one line, as shown in FIG. 4 (c).

The output of the memory 36b and the output of the 1H delay line 56 are connected to the switch 5
7, the contact A side and the contact B side are switched every 1H period, and the synchronized Yl signal and Cy signal are output as shown in FIGS. 4 (d) and 4 (e). That is, in FIG. 4, the switch 57 conducts with the contact A during one 1H period 1H-A, and the switch 57 conducts with the contact B during the other 1H period 1H-B.

The synchronized Yl signal and Cy signal are subtracted by the subtractors 58 and 59.
, The G signal of the memory 36a is subtracted from the Yl signal, the G signal of the memory 36a is subtracted from the Cy signal,
An R signal and a B signal are generated, respectively.

The G signal of the memory 36a, the R signal and the B signal of the subtracters 57 and 58 are converted to analog signals by a D / A converter 37 and output as RGB three primary color signals, and are output as a composite video signal by an encoder 38. Is also output.

According to the first embodiment, G information is obtained for all pixels,
R and B information is obtained in a line-sequential manner. Since the horizontal stripe filter 54 is also used for the R and B information, the horizontal pixel information is the same as the G information, and the horizontal resolution is the same for the R, G and B signal information. Here, the predominant information for obtaining the luminance signal information can be said to be the G signal. In fact, even if the information in the vertical direction of the R signal and the B signal slightly deteriorates, the resolution in observation does not deteriorate so much. Therefore, a resolution substantially equivalent to that of the field sequential type electronic endoscope apparatus using three color filters of R, G, and B as in the first conventional example can be obtained.

Further, since there are two types of filters for field sequential illumination, color shift can be reduced.

In contrast to the second conventional example, the horizontal stripe filter 54 is provided on the front surface of the solid-state imaging device 16 in the first embodiment, so that a false color signal in the horizontal direction which is a problem in the color chip solid-state imaging device is generated. No color resolution degradation in the horizontal direction. Therefore, it is not necessary to provide an optical filter such as a crystal filter on the front surface of the solid-state imaging device, and it is possible to reduce the size of the tip.

FIG. 5 is a block diagram showing an endoscope apparatus 61 according to a second embodiment of the present invention.

In the first embodiment, the all-color transmission filter of the rotation filter 53 is used.
Since 53W is a substantially transparent filter, the green transmission filter 53G is substantially one color, whereas the second embodiment has green and magenta color transmission filters 53G, 53Mg as shown in FIG. A rotation filter 53 of two colors is used.

Therefore, green, red, and blue light are transmitted by the rotating filter 53.

On the other hand, on the front surface of the solid-state imaging device 16, a horizontal stripe filter 54 composed of filters 54Yl and 54Cy shown in FIG. 3 is provided as in the first embodiment.

In this case as well, as in the first embodiment, the return light from the subject illuminated by the light separated in time series into the light of each wavelength region of G and Mg by the filters 53G and 53Mg of the rotation filter 53 is: An image is formed on the solid-state imaging device 16 through the filter 54 and photoelectrically converted. The photoelectrically converted signals are selectively stored in the two memories 36a and 36b at timings corresponding to the filters 53G and 53Mg of the rotation filter 53 as in the first embodiment. Here, the color filter 53G of the rotation filter 53 and the filter 5 on the front of the solid-state imaging device 16 are stored in the memory 36a.
The information passed through 4, that is, all-pixel G signal information is obtained.
On the other hand, the other memory 36b stores the filter 53M of the rotation filter 53.
The R signal information is stored as a common transmission area of Mg and Yl by the filter 54Yl, and the B signal information is stored as a common transmission area of Mg and Cy by the filter 54Cy. Therefore, the R signal information and the B signal information are stored in the memory 36 in a line-sequential manner.

These memories 36a and 36b are read simultaneously. At this time, as shown in FIGS. 7A and 7B, a G signal is obtained from the memory 36a, and an R signal and a B signal are obtained from the memory 36b. Here, the output of the memory 36b is input to the 1H delay line 56 and is delayed by one line, as shown in FIG. 7 (c). The output of the memory 36b and the output of the 1H delay line 56 are switched every 1H by a switch 57, and FIG.
As shown in (e), the synchronized R signal and B signal are output. Thus, a G signal, an R signal, and a B signal are obtained,
As in the first embodiment, predetermined processing is performed and output.

Both the first embodiment and the second embodiment are examples of an image sensor (for example, line transfer) that does not perform interlaced scanning, and the cycle of each filter of the rotary filter 53 may be, for example, every one field, or two-filter imaging in one field. May be performed. Here, when the cycle of each filter of the rotary filter 53 is for each field, one memory can be reduced as compared with FIG. 1 or FIG. 5 as shown in FIG. FIG. 8 shows a modification 61 'of the second embodiment of FIG.

In FIG. 8, the memory 36 functions as a one-field delay line. An image is captured by the solid-state image sensor 16 and the A / D converter 34
As shown in FIGS. 9 (a) and 9 (b), the output signal after passing through the G signal is one field (one field period is indicated by 1V-A and the other field period is indicated by 1V-B). ,
The R / B line sequential signal is switched, and the G signal, R / B
The line sequential signal is input to the memory 36 and the field switch 62. The signal read from the memory 36 is output after being delayed by one field as shown in FIG. 9B with respect to the signal output without being stored in the memory 36 (that is, from the A / D converter 34). Is done. This memory output signal and the output signal of the A / D converter 34 are
2 switches between A and B field by field,
The G signal and the R / B line sequential signal synchronized for each field shown in FIGS. 9 (c) and 9 (d) are obtained. G obtained
The signal and the R / B signal are output after being subjected to the same processing as in the first embodiment.

The second embodiment and its modification have substantially the same effects as the first embodiment.

 FIG. 10 is a block diagram showing a third embodiment of the present invention.

This embodiment uses a two-line simultaneous readout solid-state imaging device (indicated by 16 ').

Here, the rotary filter 53 is composed of the same green transmission filter 53G as in the second embodiment of FIG. 5, and red and blue, that is, a magenta transmission filter 53Mg.

On the other hand, on the front surface of the solid-state imaging device 16 ', a horizontal stripe filter 54 including an all-color transmission filter 54W, a yellow transmission filter 54Yl, and a cyan transmission filter 54Cy is provided for a pixel as shown in FIG. .

That is, the all-color transmission filter 54W is provided for every other pixel line, and the yellow transmission filter 54Yl and the cyan transmission filter 54Cy are provided every three pixel lines, that is, every four pixel lines.

In the case of the present embodiment, similarly to the second embodiment, the rotation filter
The return light from the subject illuminated by the light separated in time series into the light of each wavelength region of the 53 filters 53G and 53Mg is imaged on the solid-state imaging device 16 'through the filter 54,
As in the embodiment, two memories 36a and 36m are provided at timings corresponding to the filters 53G and 53Mg of the rotation filter 53, respectively.
Stored selectively in b. Here, the rotation filter 53 makes one rotation in one field cycle, and the filter 5
Imaging is performed on each of 3G and 53Mg light. On the other hand, the solid-state image pickup device 16 'side corresponds to each of the filters 53G and 53Mg with respect to the lines shown in FIGS.
1 The lines in FIG.
The same numbered lines in the figure are added and output. here,
In each field, the rotation filter 53 is a filter 53G and 53Mg
Since there are two colors, the reading of the solid-state imaging device 16 'is performed twice in each field.

When the filter 53G of the rotation filter 53 is on the optical path,
The G signal information is obtained for each line, while the rotation filter
When the 53 filter 53Mg is on the optical path, the solid-state image sensor 1
6 'front filter 54 is the line of all color transmission filter 54W
Mg, that is, R + B signal information is obtained.
An R signal is obtained from the Yl line, and a B signal is obtained from the cyan filter Cy line.

Therefore, when the image is captured under the illumination light by the filter 53Mg, in the A field, the lines in FIGS. 11A and 11A are read out and added, so that the signal lines indicated by odd numbers in FIG. Is (R + B) + R, that is, 2R + B signal, and (R + B) + B, that is, R + 2B signal is obtained from the signal line indicated by the even number. Also, for the B field, b, b 'in FIG.
Are read out and added, like the A field, the 2R + B signal,
An R + 2B signal is obtained from a signal line indicated by an even number.

That is, when an image is captured under illumination light from the filter 53G of the rotation filter 53, G signal information is output from each signal line in both the A field and the B field. Therefore,
The G signal read out in each of the A field and the B field is stored in one memory 36a in an interlaced manner.

On the other hand, when an image is captured under illumination light from the filter 53Mg of the rotation filter 53, 2R + B is obtained for odd signal lines, and R + 2B signal information and (2R + B) / (R + 2B) signal information are obtained for even signal lines in a line-sequential manner. Are stored in the memory 36b so as to perform interlaced scanning.

The G signal stored in the memory 36a and the (2R + B) / (R + 2B) signal stored in the memory 36b are read simultaneously,
(2R + B) / (R + 2B) signal is 1H delay line 56 and switch
Enter 57.

The outputs of the memory 36b and the 1H delay line 56 are synchronized as in the first embodiment, and the synchronized 2R + B, B
+ 2R signal is output.

The synchronized 2R + B and B + 2R signals are respectively doubled by amplifiers 72a and 72b that amplify the signal twice, and then input to subtracters 73a and 73b, respectively. The subtractors 73a and 73b respectively subtract the R + 2B and 2R + B signals from the 2 (2R + B) and 2 (R + 2B) signals which have been amplified twice, and after the subtraction, the coefficient unit 7
It is attenuated to 1/3 by 4a and 74b, respectively. That is, the calculation of {2 (2R + B)-(R + 2B)} / 3 (= R) {2 (R + 2B)-(2R + B)} / 3 (= B) is performed to generate the R and B signals, respectively.

The R, G, B signals obtained as described above are subjected to D / A conversion as in the first embodiment, subjected to predetermined processing, and output.

 This embodiment has the same effect as the first embodiment.

 FIG. 12 shows a block diagram of a fourth embodiment of the present invention.

In the present embodiment, as shown in FIG.
All color transmission (W) and magenta transmission (Mg) filters 53
W, 53Mg is arranged. On the other hand, a horizontal stripe filter 54 composed of a yellow transmission filter 54Yl and a cyan transmission filter 54Cy is arranged on the front surface of the solid-state imaging device 16 as in the first embodiment.

In this embodiment, similarly to the first embodiment, when a signal is read from the solid-state imaging device 16 at a timing corresponding to each color of the rotation filter 53 and an image is captured under white illumination by the filter 53W of the rotation filter 53. Is the memory 36a, the filter 5
In the case of 3Mg magenta, information is stored in the memory 36b. Here, the rotation filter 53 is a filter 53W in the memory 36a.
Under the white illumination light, a signal transmitted through the front filter 54 of the solid-state image sensor, that is, a line sequential signal of Yl and Cy is stored, and the filter 53Mg of the rotation filter 53 is stored in the memory 36b.
, And a common transmission signal of the front filter 54 of the solid-state image sensor, that is, an R / B line sequential signal as in the second embodiment.

The memory 36a and the memory 36b are read simultaneously, and the twelfth
As shown in the figure, the information in the memory 36b is subtracted from the information in the memory 36a by the subtracter 75. Here, since Y1-R = G Cy-B = G, the subtracted output becomes the G signal.

The G and R / B signals obtained as described above are output after being subjected to the same processing as in the second embodiment.

 This embodiment has the same effect as the first embodiment.

 FIG. 14 shows a fifth embodiment of the present invention.

In this device 81, the rotary filter 53 is composed of a line transmission filter 53G and a magenta transmission filter 53Mg as shown in FIG. 15, and is the same as in the second embodiment.

On the other hand, the horizontal stripe filter on the front of the solid-state
Numeral 54 includes a cyan transmission filter 54Cy and an all-color transmission filter 54W as shown in FIG.

In this embodiment, when the rotating filter 53 performs imaging under green illumination light by the filter 53G, the solid-state imaging device
When any of the filters 54Cy and 54W on the 16 front side is used, green is transmitted, so that a G signal can be obtained from all pixels.

On the other hand, when the rotating filter 53 is a magenta filter 54Mg, the striped filter 54 on the front of the solid-state imaging device 16
A B signal is obtained from Gy, and an Mg signal is obtained from the stripe filter 54W. In other words, the rotation filter 53 is the filter 53Mg
In this case, a B / Mg line sequential signal is output from the solid-state imaging device.

As in the second embodiment, the G signal is stored in the memory 36a,
/ Mg line sequential signal (In the second embodiment, it is an R / B line sequential signal)
Are stored in the memory 36b.

The B / Mg line-sequential signal passes through a 1H delay line 56 and a switch 57 to become a synchronized B and Mg signal, and a subtractor 82 subtracts the B signal from the Mg signal to generate an R signal. . After that, the R, G, B signals are output to the D / A converter 37 as in the first embodiment.

 The effect of this embodiment is similar to that of the first embodiment.

 FIG. 17 shows an apparatus 81 'according to a sixth embodiment of the present invention.

The sixth embodiment differs from the fifth embodiment in FIG. 14 in that the horizontal stripe filter 54 on the front surface of the solid-state imaging device 16 is composed of a yellow transmission filter 54Yl and an all-color transmission filter 54W as shown in FIG. ing. The rotary filter 53 is the same as that of FIG. 14 (therefore, the same as in the second embodiment). Other configurations are the same as those in FIG.

In this embodiment, when the rotation filter 53 is the filter 53G, all pixel G signals are obtained.

On the other hand, when the rotation filter 53 is the filter 53Mg, the R signal is obtained from the stripe filter 54Yl on the front surface of the solid-state imaging device 16, and the Mg signal is obtained from the stripe filter 54W.

That is, when the rotation filter 53 is the filter 53Mg, an R / Mg line sequential signal is obtained from the solid-state imaging device 16.

In this case, the G signal is output from the memory 36a and the R / Mg line sequential signal is output from the memory 36b, and the signals are synchronized by the 1H delay line 56 and the switch 57. R, Mg signals. Thus, the R signal is subtracted from the Mg signal by the subtractor 82 to generate a B signal. Subsequent steps are the same as in the first or second embodiment.

 The effect of this embodiment is similar to that of the first embodiment.

[Effects of the Invention] As described above, according to the present invention, a horizontal stripe-shaped filter is provided on the front surface of a solid-state imaging device and is illuminated in time series with two colors of illumination light. Since the displacement can be reduced and a false color signal in the horizontal direction is not generated, an optical filter for preventing a false color signal is not required, and the tip can be miniaturized.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 4 relate to a first embodiment of the present invention.
FIG. 1 is a block diagram illustrating a configuration of an endoscope apparatus according to a first embodiment;
FIG. 2 is a front view showing a rotary filter, FIG. 3 is a front view showing a horizontal stripe filter, FIG. 4 is an operation explanatory view of the first embodiment, and FIG. 5 shows a configuration of a second embodiment of the present invention. FIG. 6 is a front view showing a rotary filter according to a second embodiment, FIG. 7 is an explanatory diagram of the operation of the second embodiment, and FIG. 8 is a block diagram showing a configuration of a third embodiment of the present invention. 9, FIG. 9 is an explanatory diagram of the operation of the third embodiment, FIG. 10 is a block diagram showing the configuration of the fourth embodiment of the present invention, and FIG. FIG. 12 is a block diagram showing the configuration of a fifth embodiment of the present invention, FIG. 13 is a front view showing a rotary filter in the fifth embodiment of the present invention, and FIG. FIG. 15 is a block diagram showing a configuration of a sixth embodiment, FIG. 15 is a front view showing a rotary filter in the sixth embodiment, 16 is a front view of the horizontal stripe filter in the sixth embodiment, FIG. 17 is a block diagram showing the configuration of the seventh embodiment of the present invention, FIG. 18 is a front view of the horizontal stripe filter in the seventh embodiment, FIG. 19 is an external view showing the whole of a conventional endoscope apparatus, and FIG. 20 is a block diagram showing a configuration of the conventional example. DESCRIPTION OF SYMBOLS 1 ... Electronic endoscope, 6 ... Video processor 14 ... Light guide, 16 ... Solid-state imaging device 21 ... Lamp, 23 ... Motor 52 ... Light source device, 53 ... Rotating filter 54 ... Horizontal stripe Filter 55 …… Signal processing circuit

Claims (1)

(57) [Claims] An image pickup device having a solid-state image sensor for photoelectrically converting a subject image, a video signal processing device for processing a video signal corresponding to the output signal of the solid-state image sensor, and a different wavelength band.
In a field sequential electronic endoscope apparatus provided with an illumination means for illuminating in a time series with two illumination lights, two or more types of horizontal stripe filters that transmit different wavelength bands are provided on the front surface of the solid-state imaging device. An electronic endoscope apparatus characterized in that: