KR100257739B1 - Automatic Resolution Determination Device and Method of Solid State Imaging Device Camera - Google Patents

Abstract

PURPOSE: An apparatus and method for automatically deciding a resolution of a charge coupled device camera is provided to decide new resolution automatically by using a resolution deciding pattern plate having a specific pattern and inputting the pattern to a linear CCD camera and comparing the pattern with the pre-calculated value and feeding back to a lens unit having an electric motor. CONSTITUTION: A resolution deciding pattern unit has a resolution deciding pattern plate which is etched by a laser on a coated glass plate. A linear camera photographs patterns of the resolution deciding pattern unit and obtains an image. A camera driving unit adjusts a resolution position of the linear camera. A lens driving unit adjusts a focus by moving the linear camera. A computer compares the image obtained from the linear camera with the pre-fixed image data being set for deciding a resolution, and obtains an image again and decides wanted resolution by driving the camera driving unit and the lens driving unit in accordance with the result.

Description

Automatic Resolution Determination Device and Method of Solid State Imaging Device Camera

The present invention relates to an apparatus and method for automatically determining the resolution of a solid-state imaging device camera (hereinafter, abbreviated as "linear camera"). In particular, using a pattern plate for resolution determination with a specific pattern, which is used as an input of a linear CCD camera, compared with a pre-calculated value, and fed back to the lens unit equipped with an electric motor, thereby newly driving the lens unit. An apparatus and method for automatically determining a resolution of a solid-state imaging device camera to automatically determine

As is well known, in order to construct a system corresponding to various resolutions using a linear camera with micrometer resolution, a lens using an electric motor that can be changed is used.

On the other hand, in a linear camera equipped with thousands of solid-state imaging elements arranged in a row, the term “resolution” refers to a length in an object that the unit solid-state imaging elements of the linear camera are in charge of.

That is, the resolution of 20 μm means that one solid-state image sensor in the camera has information corresponding to the length of 20 μm of the object.

In this way, a lens with a drive must be used to check the resolution within the depth of focus to verify and adjust the resolution of the linear camera.

In the related art, there is no process for checking the resolution, and thus it is impossible to confirm the resolution.

Since the resolution was simply determined and fixed according to the specifications of the lens used, the actual resolution could not be confirmed, and the resolution was adjusted by trial and error to determine the resolution in micrometers.

Therefore, the present invention uses a pattern plate for determining the resolution having a specific pattern, and uses it as an input of a linear CCD camera, compares it with a pre-calculated value, and then feeds back to the lens unit with an electric motor to drive the lens unit. It is an object of the present invention to provide an apparatus and method for automatically determining the resolution of a solid-state imaging device camera, which is to automatically determine the resolution.

The technical means of the present invention for achieving this object is a resolution crystal pattern means having a pattern plate for resolution determination etched with a laser on a mirror-coated glass plate, and a linear to image the patterns of the resolution determination pattern means to obtain an image A camera, camera driving means for adjusting the resolution position of the linear camera, lens driving means for moving and focusing the linear camera, and an image obtained from the linear camera with a preset image data for determining the resolution And a computer for driving the camera driving means and the lens driving means and acquiring an image again to determine a desired resolution.

In addition, the method of the present invention for achieving this object comprises a first step of moving the camera to a set position. A second process of focusing on the resolution determining pattern plate at the moved position and then capturing and acquiring an image; comparing the data of the acquired image with arbitrary calculated data and moving the camera again to reconstruct the image The third step is to acquire and continue to perform until the camera is adjusted to the desired resolution.

1 is a pattern illustration of a pattern plate for resolution determination applied to the present invention.

2 is a schematic configuration diagram of an automatic resolution determining device for a solid-state imaging device camera according to the present invention.

3 is an operation flowchart for explaining FIG.

* Explanation of symbols for main parts of the drawings

10: resolution determining pattern portion 20: linear camera

30: camera driving unit 40: lens driving unit

50: computer

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of an automatic resolution determination device for a solid-state imaging device camera according to the present invention. The resolution determination pattern portion 10 having a resolution-determination pattern plate etched with a laser on a mirror-coated glass plate, and the resolution The linear camera 20 which captures images of the patterns of the crystal pattern unit 10 to acquire an image, the camera driver 30 for adjusting the resolution position of the linear camera 20, and the linear camera 20 are moved. The lens driver 40 for focusing and the image obtained by the linear camera 20 are compared with preset image data to determine the resolution, and accordingly, the camera driver 30 and the lens driver 40 are It is comprised by the computer 50 which drives and acquires an image again, and determines a desired resolution.

The operation and effect of the present invention configured as described above will be described with reference to FIGS. 1 to 3 as follows.

First, the resolution of the linear camera is determined using a pattern plate on which a specific pattern is drawn using a laser capable of fine etching on a glass plate coated with a mirror.

That is, Figure 1 shows an example of the pattern used on the glass plate is mirror-coated with the laser used in the present invention.

As shown therein, 1, 2, 3, and 4 are a series of parallel lines having a constant thickness at regular intervals.

When these lines are incident on the linear camera 20 in the form of an image, the part without the pattern is reflected by the property of the mirror-coated glass plate, but no reflection occurs in the pattern part being etched.

Therefore, since the line part will show a low brightness value, it is the unit length from the left side recognized as the line to the left side of the next line or from the right side to the right side of the next line.

This unit length is recognized by the linear camera 20 by the number of patterns, and the resolution is determined through the statistical processing of these values.

Here, a set of four different width lines is illustrated.

On the other hand, 5 and 6 are each composed of a square with a constant height and width of the pattern, and a circle that is always constant from the origin, so that the horizontal resolution of the linear camera 20 (determined by the lens) and the vertical resolution (relative between the linear camera and the subject) A pattern for calculating the aspect ratio by fitting a line transfer signal to a camera according to a motion.

In addition, 7 is a continuous drawing of the darkest pattern and the brightest pattern at the same interval. This is to correct the values obtained through 1, 2, 3, and 4 by comparing with reference to 3, 4 and 4, respectively.

In addition, you can check the value of the correction value again by finding the sum of the light and dark bars.

The method of automatically determining the resolution of the linear camera using the resolution determining pattern portion based on this will be described below.

First, in order to focus roughly, the camera driver 30 is driven to position the linear camera 20 by anisotropically placing the settled resolution determining pattern portion 10.

Next, the lens driving unit 40 is operated to focus on the resolution determining pattern unit 10.

Thereafter, the patterns of the resolution determining pattern unit 10 are picked up by the linear camera 20 to acquire an image, and are transferred to the computer 50 for comparison with preset image data for determining the resolution, and calculating a calculation result value. .

That is, according to the result calculated by the computer 50, the camera driving unit and the lens driving unit are driven to image the patterns of the resolution determining pattern unit 10 and perform the above calculation process.

This series of processes is continued until the linear camera 20 is fitted to the desired resolution.

In this process, the operation of the lens driver 40 is for focusing, and continuously receives an image with the linear camera 20 to perform a program for focusing inherent in the computer 50.

At this time, the method for focusing will be described with reference to the algorithm shown in FIG.

First, a process of acquiring an image including the boundary of the resolution determining pattern plate is performed, and the brightness value of one line in the horizontal direction including the background of the entire resolution determining pattern plate and the boundary of the pattern is shown. It is achieved by performing the process of calculating the difference in brightness value at the boundary by moving the camera vertically at regular intervals, and determining the point showing the difference in the maximum brightness value as a focus.

As described above, the present invention has the effect of determining the resolution of the linear camera in the system using the linear camera and automatically performing the verification, and also determining the resolution by using the patterns etched with the example on the mirror-coated glass plate as a reference. The reliability of the effect is improved.

In addition, there is an effect of improving the maintenance and repairability by using a glass plate without corrosion as a material of the pattern plate.

Claims (4)

A resolution determination pattern means having a resolution-determination pattern plate etched with a laser on a mirror-coated glass plate, a linear camera for capturing images by imaging the patterns of the resolution determination pattern means, and a camera for adjusting the resolution position of the linear camera A driving means, lens driving means for moving and focusing the linear camera, and an image obtained from the linear camera is compared with preset image data for determining a resolution, and the camera driving means and lens driving means according to the result. And a computer for determining a desired resolution by acquiring an image again by driving a. The automatic determination device of a solid state image pickup device camera according to claim 1, wherein the resolution plate is a glass plate. A first process of moving the camera to a set position, a second process of focusing on the pattern plate for resolution determination at the moved position, and then capturing and acquiring an image; and optionally calculating data of the acquired image And a third process of moving the camera to obtain the image again in comparison with the data, and continuing until the camera is adjusted to the desired resolution. 4. The horizontal direction of claim 3, wherein the second process comprises: A process of acquiring an image such that the boundary of the pattern plate for resolution determination is included; A process of calculating the difference in brightness at the boundary by moving the camera vertically at regular intervals by showing the brightness value in a row of C; and determining the point where the difference in the maximum brightness value is calculated as the focus point. Method for automatically determining the resolution of a solid-state imaging device camera, characterized in that consisting of steps.

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