JPH06315155A - Color image pickup device - Google Patents

Abstract

PURPOSE:To obtain a color image pickup device where an image of high resolution can be obtained when the motion of an object is small and an image with little color slurring can be obtained when the motion of the object is large. CONSTITUTION:This device is provided with a surface sequential image pickup device performing the color image pickup of an object 20 by rotating a rotary filter 5 before a black-and-white image pickup means, a moving amount detection circuit 10 detecting the moving amount, of the object 20 and outputting the moving amount detection signal according to moving amount and a control circuit 18 changing the fetching speed of the images of a CMD camera 7 by the moving amount detection signal from this moving amount detection circuit 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image pickup apparatus having a frame sequential image pickup means.

[0002]

2. Description of the Related Art Conventionally, as a color image pickup device, there is a frame sequential type image pickup device which performs color image pickup by rotating a color filter disk in front of a monochrome image pickup tube or a monochrome image pickup element. As an example of this, as disclosed in Japanese Patent Application Laid-Open No. 2-124694, a plurality of frame memories for writing red, green and blue image data from a frame sequential color camera, and images written in the frame memories. A monitor that reads data, a television camera control device that controls the writing timing for each frame to be one pixel before the reading timing, and the video data that is read from one of the frame memories The delay means for delaying by the pixel read time, the comparing means for comparing the delayed video data with the video data to be written, and the switching means for switching and outputting one video data or three video data according to the comparison result. It is equipped.

In such a structure, the control means controls the write timing of each frame memory to be one pixel before the read timing, and the last input pixel data for all the pixels in the screen , 1 pixel reading time stored by the delay means before that,
The delayed pixel data is compared by the comparison means, and when the two match, the switching means R (red), G
(Green) and B (blue) are output respectively, and when the comparison results by the comparison means do not match, one of R, G and B is output to switch to a black and white image. .

[0004]

In the conventional color image pickup apparatus described above, when a subject and a frame sequential color camera are relatively moving, a so-called color blur (color shift) phenomenon occurs and an image is displayed. It has the drawback of being difficult to see. Also, when the subject and the frame sequential color camera are moving relatively, the image of only one signal of R, G, and B is output, so the image becomes black and white, and the remaining two components are Since the signal is discarded, there is a drawback that the brightness is different as compared with the case where R (red), G (green), and B (blue) are output respectively.

It is an object of the present invention to provide a color image pickup apparatus which can obtain a high-resolution image when the amount of movement of a subject is small, and can obtain an image with little color shift when the amount of movement of the subject is large. To do.

[0006]

In order to achieve the above-mentioned object, the invention corresponding to claim 1 is a frame sequential image pickup device for rotating a color filter in front of a monochrome image pickup device to perform color image pickup of a subject. A frame memory that stores image signals captured by the frame-sequential imaging device for each of the three primary colors of light,
The image signal stored in each frame memory is read out,
A monitor for synthesizing and displaying an image of this, a movement amount detection device for detecting the movement amount of the subject, and outputting a movement amount detection signal according to when the movement amount exceeds a predetermined value, and the movement amount detection device. And a capturing speed changing device that changes a capturing speed of an image signal captured in the frame sequential image capturing device based on a movement amount detection signal from the image capturing device.

[0007]

According to the invention corresponding to claim 1, since the taking-in speed of the field sequential image pickup means is changed according to the moving amount of the object, a high resolution image can be obtained when the moving amount of the object is small. Also, when the amount of movement of the subject increases, an image with less color misregistration can be obtained.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. The illumination device 1 includes a subject 2 placed on a stage 2.
Irradiate 0. Then, the light that has passed through the subject 20 passes through the objective lens 3, the imaging lens 4, and the rotary filter 5, and C
An image is formed on the MD camera (Charge Modulation Device camera) 7. The rotary filter 5 is rotated by a motor 6, and R (red), G (green), and B are arranged along the outer peripheral edge direction of the disk.
A (blue) color transmission filter (not shown) is attached, and the motor 6 is controlled by the control circuit 18 described later.

The R, G and B video signals obtained from the CMD camera 7 are converted into digital signals by the A / D converter 8. The digital signal converted by the A / D converter 8 is input to the coefficient unit 9, where the brightness is adjusted to, for example, K times. The digital signal converted by the A / D converter 8 is input to the subject movement amount detection circuit 10, where the movement amount of the subject is detected, and an output according to the detected movement amount of the subject 20 will be described later. Control circuit 1
8 is input.

FIG. 3 is a diagram for explaining the function of the subject movement amount detection circuit 10. As shown in FIG.
The signal voltage V is output according to the movement amount L of 0. For example,
When the amount of movement L1 of the subject 20 is output, the signal voltage V1 is output,
Further, the signal voltage V2 is output when the moving amount of the subject 20 is L2.

The R and B signals output from the coefficient unit 9 are stored in the frame memories 11 and 13, respectively, and the G signal is stored in the frame memory 12 via the frame memory 22 and the selector 21, or directly. It is stored in the frame memory 12 via the selector 21. The signals stored in the frame memories 11 to 13 are respectively D /
The analog signals are converted into analog signals by the A converters 14, 15 and 16, and the converted signals are output to the monitor 17.

As shown in FIG. 6, the synchronizing signal generating circuit 19 includes a synchronizing signal (1) and clocks (CLK) (2), (3),
(4) occurs, and these functions will be described next.
CLK (2) is generated when the movement amount is 0 ≦ L <L1, and the image signal from the CMD camera 7 is taken into the A / D converter 8 as shown in FIG. 7 and the coefficient of the coefficient unit 9 is not changed. And writing to the frame memories 11 to 13 and reading data from the frame memories 11 to 13,
Further, it is a timing signal to be input to the D / A converters 14 to 16.

The synchronizing signal (1) is supplied to the D / A converters 14-16.
It is a timing signal for outputting to the monitor 17 the analog image signals corresponding to the frame memories 11 to 13 converted by the above, and is unchanged regardless of the movement amount of the subject 20.

CLK (3) is generated when the moving amount is L1≤L <L2, the image signal from the CMD camera 7 is taken into the A / D converter 8 as shown in FIG. This is a timing signal for changing to K1 and writing to the frame memories 11 to 13.

CLK (4) is generated when the moving amount L2≤L, the image signal from the CMD camera 7 is taken into the A / D converter 8 and the coefficient of the coefficient unit 9 is K2 as shown in FIG.
To the frame memories 11 to 13 and writing / reading / writing of the frame memory 22.

As shown in FIG. 7, the control circuit 18 selects a clock to be used according to the detection signal from the subject movement amount detection circuit 10, changes the speed command of the motor 6, and adjusts the coefficient value of the coefficient unit 9. Is given, the speed of capturing an image signal from the CMD camera 7 to the A / D converter 8 is changed, and a selection signal is given to the selector 21.

FIG. 4 shows control voltages applied to the CMD camera 7 and the motor 6 based on the detection signal from the subject movement amount detection circuit 10. The above-described objective lens 3, imaging lens 4, rotary filter 5, motor 6, and CMD camera 7 constitute the frame sequential imaging device of the present invention, and the subject movement amount detection circuit 10 constitutes the movement amount detection device of the present invention. Then
The control circuit 18 constitutes the capturing speed changing device of the present invention.

Next, the operation of the embodiment configured as described above will be described with reference to FIG. When the amount of movement of the subject 20 is not detected by the subject movement amount detection circuit 10, the operation is similar to the conventional example. That is, the control circuit 1
Since the motor 8 does not operate, the speed of the motor 6 remains constant, and the signal of the CMD camera 7 is converted into digital signals R, G, B by the A / D converter 8, and this is converted into a frame via the coefficient multiplier 9. The signals stored in the memories 11, 12 and 13 are converted into analog signals by the D / A converters 14, 15 and 16 and output to the monitor 17.

From the object movement amount detection circuit 10 to the object 20
Is detected, and an output corresponding to the moved amount is input to the control circuit 18. Then, the control circuit 18 raises the speed command to the motor 6 step by step in proportion to the moving amount, whereby the speed of the motor 6 increases according to the speed command.

Along with this, the exposure time of the CMD camera 7 becomes short and dark. Therefore, the control circuit 18 changes the coefficient of the coefficient unit to K in order to amplify the image signal, so that the image becomes bright. Then, the write destination address of the R, G, B image signals to the frame memories 11 to 13 is set to CM.
According to the reading speed from the D camera 7, the camera is divided into one and two. The signals R, G, B multiplied by K by the coefficient unit 9 are stored in the frame memories 11 to 13, respectively.

Then, in response to a control signal from the control circuit 18, the frame memories 11-13 to the D / A converters 14-1.
The R, G, and B image signals of the frame are simultaneously read in 6, and converted into analog signals by the D / A converters 14 to 16 and sent to the monitor 17. When outputting the image signal to the monitor 17, when the write destination addresses of the R, G, and B signals to the frame memories 11 to 13 are skipped by one, the same image signal is output for two pixels, and the write destination is written. When two addresses are skipped, three pixels of the image signal are output.

As a result, with one frame sequential image pickup device, a high-resolution image without color shift is obtained when the subject 20 is not moved, and the resolution is slightly lowered when the subject 20 is moved. , An image with little color shift can be obtained.

FIG. 5 is a diagram for explaining this. When the movement amount of the subject 20 is detected by the subject movement amount detection circuit 10 and the movement amount is 0 ≦ L <L1, the CMD camera 7 is taken in. Speed (CMD7 output) and monitor 1
7 (the outputs of the frame memories 11 to 13) are shown in FIG.
As shown in (a).

The amount of movement of the subject 20 is detected by the subject movement amount detection circuit 10, and the amount of movement is L1≤L <L.
When 2, the capture speed of the CMD camera 7 (CMD7
Output) and the output of the monitor 17 (frame memory 11
Outputs of 13 to 13) are as shown in FIG.

Further, when the movement amount of the subject 20 is detected from the subject movement amount detection circuit 10 and the movement amount is L ≧ L2, the fetch speed of the CMD camera 7 (output of the CMD 7) and the frame memories 11 to 13 are entered. And the output of the monitor 17 (output of the frame memories 11 to 13) are as shown in FIG.

In the case of FIG. 5C, the control circuit 18 gives a selection signal to the selector 21 so as to select the G signal passed through the frame memory 22. In this way, the frame memory 22 is passed through the frame memory 22, for example, because the update of the signal from G ₀ to G ₁ is completed while the G ₀ signal is being output, so that the signals of G ₀ and G ₁ are one frame. This is because the output is mixed in (one screen).

In FIGS. 5A, 5B, and 5C, the rate (processing time for one frame) is constant until writing to the frame memories 11 to 13. In the above-described embodiment, the case where the CMD camera is used as the camera has been described, but the charge coupled device (Charge Coupled D
evice: The same can be done with a camera (abbreviated as CCD). Further, instead of the subject movement amount detection circuit 10 of the above-described embodiment, either the movement amount detection integrated circuit or the encoder may be used for the stage 2.

[0028]

According to the present invention described above, a color image pickup apparatus which can obtain a high-resolution image when the amount of movement of the subject is small, and can obtain an image with little color shift when the amount of movement of the subject is large. Can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a first embodiment of a color image pickup device according to the present invention.

FIG. 2 is a diagram for explaining a function of a subject movement amount detection circuit in FIG.

FIG. 3 is a diagram for explaining a function of a subject movement amount detection circuit in FIG.

FIG. 4 is a diagram for explaining the function of the control circuit of FIG.

FIG. 5 is a time chart for explaining the operation of the first embodiment of the color image pickup device according to the present invention.

6 is a diagram for explaining the function of the synchronization signal generation circuit of FIG.

FIG. 7 is a diagram for explaining the relationship between the subject movement amount detection circuit and the control circuit in FIG.

[Explanation of symbols]

1 ... Illumination device, 2 ... Stage, 3 ... Objective lens, 4 ... Imaging lens, 5 ... Rotation filter, 6 ... Motor, 7 ... CMD
Camera, 8 ... A / D converter, 9 ... coefficient unit, 11, 12,
13 ... Frame memory, 14, 15, 16 ... D / A converter, 17 ... Monitor, 18 ... Control circuit, 19 ... Sync generation circuit, 20 ... Subject, 21 ... Selector, 22 ... Frame memory.

Claims (1)

[Claims] 1. A frame-sequential imaging device for rotating a color filter in front of a black-and-white imaging device to color-image a subject, and an image signal captured by the frame-sequential imaging device is stored for each of the three primary colors of light. The frame memory and the image signal stored in each frame memory are read out,
A monitor that synthesizes and displays this image, a movement amount detection device that detects the movement amount of the subject and outputs a movement amount detection signal corresponding to when the movement amount exceeds a predetermined value, and this movement amount detection device And a capture speed changing device that changes a capture speed of an image signal captured into the frame sequential image pickup device based on a movement amount detection signal from the color image pickup device.