JPH04329075A - Video signal processor - Google Patents

Abstract

PURPOSE:To correct an optical center dislocation by adjusting the relative position in the screen of the image by a video signal corresponding to the optical system image in accordance with the optical system zooming condition based on the holding information of a fixed object. CONSTITUTION:The storing information of a writable and readable frame memory 14 is read to a system controller 17, and the difference between the value at the time of a first zooming of a marker for teaching and second, third values is stored into an E<2>PROM 19 as optical center dislocation correcting quantity. In this case, the storing information of the E<2>PROM 19 becomes the corrected value of an initial address when an image is read, a memory controller 18 is operated based on this and it is fed back to the frame memory 14. Then, after the initial setting is completed, only the data in the E<2>PROM 19 are important, the data comparator, etc., become unnecessary and the animation output image-corrected by the communication among the E<2>PROM 19, the memory controller 18 and the frame memory 14 is obtained.

Description

[Detailed description of the invention]

0001

FIELD OF INDUSTRIAL APPLICATION The present invention relates to a video signal processing device, and more particularly, a video signal processing device capable of automatically correcting zoom center deviation caused by the zooming operation of the optical system in a camera having a zoom optical system. Regarding equipment.

0002

2. Description of the Related Art As is well known, in a camera having a zooming optical system, the photographing magnification of the screen can be changed from telephoto to wide by a zooming operation. Particularly with microscopes, zooming operations are indispensable because it is necessary to vary the magnification of the sample over a wide range.

In this case, in order to reduce fatigue during microscope observation work or to allow a large number of people to observe, a TV camera is attached to the eyepiece of the microscope, which can change the zoom magnification, and the magnified image is displayed on a TV monitor. Conventionally, methods that allow observation to be performed have been frequently used.

0004

[Problems to be Solved by the Invention] However, in the above-mentioned means of attaching a TV camera to the eyepiece of a microscope that can change the zoom magnification and observing an enlarged image on a TV monitor, it is difficult to attach the TV camera to the optical axis center of the microscope. If the optical center of the light receiving section (photoelectric conversion element) of the TV camera does not match perfectly, the center position of the monitor image will move when the zoom magnification is changed, making it very difficult to handle. For example, when you find a sample you want to magnify at low magnification and increase the magnification to high magnification, it may move out of the monitor screen.

For this purpose, the higher the zoom magnification of the microscope, the more precisely it is necessary to mechanically match the center position. However, once the eyepiece mount position has been determined, the photoelectric X-Y adjustment of the conversion element is required. This not only makes workability difficult, but also increases the cost of the system. Further, when the lens position changes due to zoom operation, the optical axis center may also change, causing a similar problem.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a video signal processing device that solves the above-mentioned problems and electrically corrects the optical center shift that occurs due to the zoom operation of the optical system.

[0007]

[Means and effects for solving the problems] The information signal processing device of the present invention includes an information holding means that holds information regarding a change in the position of a fixed subject within a screen according to a zooming operation of the optical system; means for adjusting the relative position within the screen of an image based on a video signal corresponding to the image of the optical system according to the zooming status of the optical system, based on the information held in the information holding means; It is characterized by:

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below using an example in which the present invention is applied to a microscope TV camera system. First, before explaining the embodiments of the present invention, the basic concept thereof will be explained. The present invention incorporates information relating to changes in position within the screen of a TV camera into an information holding means such as an E2 PROM, By adjusting the relative position within the above-mentioned screen of the image based on the video signal corresponding to the image of the zoom optical system according to the zooming status of the microscope, in other words, by executing image position correction, the optimal position image can be obtained at any point in the zooming operation. That is. Specifically, (1) a zoom encoder for reading the zoom magnification (zoom lens position) of the microscope is provided on the microscope side, and the information is output to a system controller to be described later.

(2) With the microscope and TV camera set as a set, teaching is performed once using a pattern indicating the center position, and the amount of correction to be applied to the zoom magnification is determined.

(3) Corresponding to this correction amount, the read address is corrected when reading the memory. (4) Output a moving image by writing and reading from frame memory or field memory as needed.

(5) Furthermore, the display area on the TV screen is made narrower than the memory output valid display period, allowing for some margin in the zoom movement correction amount. In other words, apply blanking.

The above is the basic concept of the present invention. Next, an example will be described.

FIG. 1 is a block configuration diagram of a video signal processing apparatus showing an embodiment of the present invention, which roughly consists of a microscope TV camera unit 1 having a TV camera 8 attached to the microscope eyepiece and a signal processing section 11. In the microscope TV camera unit 1, the TV camera 8 may be integrally formed with the casing of the microscope, or may be a separate unit. The optical system of this microscope is formed of a zoom lens group 2, a compensator lens group 3, and an eyepiece group 4, and by rotating the zoom ring 5, the zoom and the The zoom lens group 2 and the compensator lens group 3 are moved to vary the zoom magnification and perform focusing. Note that the zoom lens group 2 is equipped with a zoom encoder 2a, which encodes the lens position of the zoom lens group 2 and supplies it to a system controller 17, which will be described later.

The image of the sample placed on the sample stage 9 is captured by the objective lens 6, zoom lens group 2, compensator lens group 3,
The light passes through the eyepiece lens 4 and is imaged on the light receiving surface of the image sensor 8a of the TV camera 8.

The video signal photoelectrically converted by the element 8a is
The signal is processed by the first signal processing circuit 12 of the signal processing section 11, and a luminance signal Y and a color signal C are output. The luminance signal Y and color signal C are converted into digital signals by an A/D conversion circuit 13 and then written into a frame (or field) memory 14.

Luminance signal Y read out from the memory 14
After the color signal C is converted into an analog signal by the D/A conversion circuit 15, the second signal processing circuit 16 converts it into an NTSC signal, for example.
The video signal is converted into a composite video signal of the system and displayed on the TV monitor 20.

Now, in the frame memory 14, as will be described later, the start position of the memory address corresponding to the output of the zoom encoder 2a is stored as a lookup table on the E2 PROM 19, so the memory controller 18 stores this lookup table. The start address of the data to be stored in the frame memory 14 is determined by reading the up table. In addition, the above A/D
Conversion circuit 13, frame memory 14, A/D conversion circuit 1
Each operation sequence of 5 is controlled by a system controller 17.

Furthermore, since the frame memory 14 is a dual-port memory that can be read and written at any time, the image accompanying the zooming operation of the sample on the sample stage 9 can be displayed on the TV monitor 20 as a moving image.

The operation of this embodiment configured as described above will be explained with reference to FIGS. 2 and 3. First, the zoom ring 6 is rotated to set the zoom magnification to the low magnification side or the high magnification side, and a teaching marker is placed on the sample stage 9 so that the marking is located at the center of the monitor screen at this time.

Next, by changing the zoom magnification, the above marking position is adjusted to the X axis and Y axis relative to the output of the zoom encoder 2a.
Memorize how it changes in the axial direction. In this case, the initial position χ0 is set as a value on a section obtained by dividing the entire screen into, for example, 512 x 512, as shown in FIG. Suppose that it moves sequentially from χ1 → χ2 → χ3 → χ4 shown by the coordinates in FIG. 2(A).

Therefore, in order not to change the positioning of the zoom center position corresponding to the zoom encoder output, the start address of the readout address of each image position χ1, χ2, χ3, χ4 is set to the image position as shown in FIG. 2(B). If it is changed every time, each image position χ1, χ2
, χ3, χ4 match the initial position χ0. Then, the leading address of the readout address for each readout of each image is stored in the information holding means represented by the E2PROM 19 as information related to a change in the position of the fixed subject, that is, the teaching marker, within the screen.

This process will be explained in detail with reference to FIG. 3, which shows a block diagram of the frame (field) memory 14, system controller 17, E2 PROM 19, and their peripheral circuits in FIG. 1.

By the way, since the frame (field) memory 14 is a dual-port memory that can be written to and read from as described above, the data written to the memory 14 is determined based on the address information output from the address counter of the system controller 17. The data are sequentially read out and supplied to the data comparator 21. Comparator 2
1, the data sequentially read out from the frame memory 14 is compared in terms of height from the threshold level. For example, when the active "H" output corresponding to the black teaching marker mentioned above is read out, this active "H" output is read out. ”The output is sent to the address latch circuit 22.

Since this latch circuit 22 is supplied with address information from the system controller 17, it latches the address information at the moment when the active "H" output is sent from the comparator 21. This latched address data is stored in the I/O of the system controller 17.
Since it is fed back to the O port, if this is the initial state in teaching, the address of the initial state is stored in the ROM or the like in the controller 17.

Next, the zoom ring 5 is moved to the opposite side, the address data corresponding to the value of the zoom encoder 2a at that time is latched, and the address data is read. By calculating this address data with the address data in the initial state, the amount of change in the address can be determined, and this is written into the E2 PROM 19.

The information stored in the E2 PROM 19 described above serves as a correction value for the initial address when reading an image, so the memory controller 18 is operated based on this information and fed back to the frame memory 14. Therefore, after completing the initial settings described above, E2P
Only the data in ROM19 is important, and the data comparator etc. in Figure 3 above are no longer necessary, and E2 PROM1
9, the communication between the memory controller 18 and the frame memory 14 provides an image-corrected moving image output.

By the way, blanking areas 20a are provided on the top, bottom, left and right sides of the TV monitor 20 (see FIG. 1), for example, 20% from the front porch and 20% from the back porch. Thereby, even if the position on the screen is corrected as in the present invention, it can be prevented from looking unsightly.

The same solution as the present invention can also be expected by manipulating, for example, the horizontal and vertical deflection signals of a TV monitor based on the position correction data on the screen.

In the above embodiment, the present invention was explained as an example in which the present invention was applied to a microscope TV camera system, but the present invention is not limited to this, but can of course be widely applied to cameras having a zoom optical system. .

[0030]

As described above, according to the present invention, the information holding means holds information regarding the change in the position of a fixed subject within the screen according to the zooming operation of the optical system, and based on the held information, Therefore, the relative position of the image in the screen according to the video signal corresponding to the image of the optical system is adjusted according to the zooming status of the optical system, so that the optical A remarkable effect is achieved in that center deviation can be electrically corrected.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram of a video signal processing device showing an embodiment of the present invention.

FIG. 2 is a diagram showing a movement locus of an image of the optical system.

FIG. 3 is a block configuration diagram illustrating details for obtaining a moving image output with image correction in FIG. 1;

[Explanation of symbols]

1...Microscope TV camera (optical system)

Claims (1)

[Claims] Claims: 1. Information holding means holding information regarding a change in the position of a fixed subject within a screen in response to a zooming operation of the optical system; 1. A video signal processing device comprising: means for adjusting the relative position within the screen of an image based on a video signal corresponding to the image of the optical system according to a zooming situation of the optical system.