JPH05316439A - Vsub automatic adjustment device - Google Patents

Abstract

PURPOSE:To detect a drooping appearing in a picture in a very short time by analyzing only picture data of a part from which occurrence of the drooping is expected in the picture of an exclusive chart. CONSTITUTION:Digital picture data of a video image by a video camera are binarized by a binarizing converter 5 in a read area designation section 5 and stored in a binary memory 52. A pattern read start point and end point calculation section 54 compares binary picture data stored in the binary memory 52 with binarized standard pattern data stored in a matching memory 53 to detect a center position of two circular holes 81,82 and five areas on a contour line on a bottom side of a comb-line pattern 80 are calculated based thereon. A computer section 6 reads only digital picture data at an address corresponding to the five areas from a digital picture memory 4, analyzes whether or not data representing a prescribed quantity or over are in existence regardless of a location at the outside of the comb-line pattern thereby discriminating the presence of occurrence of drooping. Object areas for the analysis are limited, resulting that the analysis operation of the computer section 6 is much reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Vsub automatic adjusting device for automatically adjusting the Vsub voltage of an image pickup camera using a CCD (charge transfer device), and more particularly, it enables adjustment in a short time.

[0002]

2. Description of the Related Art In an image pickup camera using a CCD, if the Vsub voltage that determines the depth of the potential well is too low, the charge overflows, causing blooming or so-called "sag" in the image. On the contrary, if the potential well is too deep, the amount of signal charges that can be transferred is small, and a clear image cannot be obtained. Therefore, in the manufacturing process of the image pickup camera using the CCD, the step of adjusting the Vsub voltage becomes necessary.

Conventionally, the adjustment of the Vsub voltage is performed as shown in FIG.
A dedicated chart 9 called a U-shaped chart as shown in FIG. 2 is photographed by an image pickup camera, and a worker makes necessary adjustments while observing the image. This U-shaped chart 9 is made by cutting out a U-shaped pattern 90 from a black board, and a light is emitted from the back surface of this U-shaped chart 9 to photograph it with an imaging camera.

At this time, if the Vsub voltage is too low, as shown in FIG. 3B, a bleeding called "sag" occurs at the bottom portion of the photographed image facing the U-shaped pattern stick. In addition, blooming appears in the lower part of the image corresponding to the streak of the U-shaped vertical bar. The operator operates the variable resistor for adjusting the Vsub voltage with a driver while visually observing the image, and gradually increases the Vsub voltage until the sag and blooming disappear. The voltage at the time when both the sag and blooming disappear is the adjustment value of the Vsub voltage, and the adjustment operation is terminated in such a state.

Attempts have been made to automate this adjustment work using a computer, but it has not been put to practical use because the measurement takes too much time.

[0006]

However, the conventional adjustment method that relies on manual labor has a problem in that variations occur due to individual differences among workers. In addition, the adjustment work itself is a repetition of simple work, which causes fatigue of the eyes and body of the worker, leaving room for improvement in terms of the working environment.

The present invention solves the above-mentioned problems of the prior art, and is a Vsu of an image pickup camera using a CCD.
Vsub that can adjust b voltage accurately in a short time
The purpose is to provide an automatic adjustment device.

[0008]

Therefore, in the present invention, in the Vsub automatic adjusting device for photographing the dedicated chart with the image pickup camera and adjusting the Vsub voltage of the image pickup camera using the CCD based on the image, the dedicated chart is used. A digital image memory for storing a digital image of the captured image, a readout area designating unit for designating a part of the pattern of the dedicated chart in the digital image as a readout area, and the brightness of the scanning line at the bottom of the image display screen by the imaging camera. Peak value measuring means for measuring the peak value of Vs and analyzing the digital image data designated in the read area and comparing the peak value with a reference value Vs.
A determination unit that determines the adjustment degree of the ub voltage and an adjustment unit that adjusts the Vsub voltage of the imaging camera based on the determination made by the determination unit are provided.

Further, the dedicated chart is composed of a comb-shaped pattern formed by cutting out a black plate and circular hole patterns formed at both ends of the contour line of the bottom of the comb-shaped shape, and the center position of the circular hole is determined. The connecting line is matched with the contour line.

[0010]

In this Vsub automatic adjusting device, only the image data of the portion of the image of the dedicated chart where the sagging is expected is analyzed to determine the presence or absence of the sagging of the image, and the scanning line at the bottom of the screen is also analyzed. Whether or not there is blooming can be discriminated by the peak value of the luminance. Therefore, it is possible to detect the sag and blooming appearing in the image in an extremely short time.

When a dedicated chart having circular holes on both sides of a comb shape is used, the circular holes are used for alignment, so that pattern matching with the standard pattern can be easily achieved, and the read area designating means. It is possible to quickly determine the read area in.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a Vsub automatic adjusting apparatus according to an embodiment of the present invention photographs a dedicated chart 8 illuminated by a backlight 10 with a video camera 1 to be inspected, and analyzes the image. Video camera 1 while doing
The Vsub voltage is automatically adjusted to an appropriate value, and as a mechanism for detecting the blooming of the image, the peak value measuring unit 2 for measuring the peak value of the luminance of the bottom line of the image is provided, and the sagging of the image is also performed. As a detection mechanism, an A / D that converts the video signal of the video camera 1 into a digital signal
A converter 3, a digital image memory 4 for storing the converted digital image signal, and a read area designating unit 5 for designating a read start point and a read end point of the digital image signal are provided, and further, detection of the peak value measuring unit 2 is performed. A computer unit 6 that determines the adjustment degree of the Vsub voltage based on the value and the data read from the digital image memory 4, and a driver unit 7 that performs the adjustment operation of the Vsub adjustment variable resistance based on the determination of the computer unit 6 are provided. There is.

The read-out area designating section 5 binarizes the digital image signal so that the black portion and the cut-out graphic portion of the dedicated chart plate 8 have different values.
51, a binary memory 52 for storing the binarized data,
The matching memory 53 that stores the binarized standard pattern data of the dedicated chart is compared with the data of the matching memory 53 and the data of the binary memory 52 to determine the reading start point and the ending point of the digital image signal. It is composed of a predetermined pattern reading start point / end point calculation unit 54.

The dedicated chart plate 8 used here
As shown in FIG. 1 and as is clear from the image shown in FIG. 2 (a), the comb-shaped cutout figure 80 in which U-shaped patterns are horizontally continuous and the comb-shaped cutout figure 80 The shape of the circular holes 81, 82 provided at both ends of the contour line of the bottom side is provided, and the line connecting the centers of these circular holes 81, 82 coincides with the contour line of the bottom side of the comb shape 80. .

Next, the adjusting operation by the Vsub automatic adjusting device will be described.

FIG. 2 shows an image when the dedicated chart 8 is photographed by the video camera 1 before adjusting the Vsub voltage.
It is shown in (a). From this state, the Vsub voltage is gradually raised, and the voltage value when the sagging and blooming appearing here disappear is the Vsub voltage to be obtained.

To set this voltage value, the computer section 6 drives the driver section 7 and gradually increases the Vsub voltage while determining the presence or absence of sag and blooming. Then, when the sagging and blooming are no longer detected, the driving of the driver unit 7 is stopped.

The detection of the sag is performed by the computer unit 6 reading and analyzing the digital image data of the image of the video camera 1 stored in the digital image memory 4. However, at this time, the computer unit 6 does not read and analyze all of the digital image data, but analyzes only the data between the start point and the end point at which the read region designating unit 5 designates reading.

On the other hand, in the read-out area designating section 5, as shown in FIG.
As shown in (b), the portion where sagging occurs, that is, the five areas (ΔX1, ΔY1) (ΔX5, ΔY5) of the contour line of the bottom facing the standing bar of the comb-shaped pattern It is calculated as a read start point and a read end point, and this data is transmitted to the computer unit 6.

In order to perform this calculation, in the read-out area designating section 5, the digital image data of the video of the video camera is binarized by the binarizing converter 51 and stored in the binary memory 52. The pattern read start point / end point calculation unit 54 compares the binary image data stored in the binary memory 52 with the binarized standard pattern data stored in the matching memory 53 to obtain two values. The center positions of the circular holes 81, 82 are detected, and based on the detected positions, the above 5 on the contour line of the bottom side of the comb pattern 80 is detected.
Calculate two areas.

In the computer section 6, only the digital image data of the addresses corresponding to these five areas are read out from the digital image memory 4, and the data showing the brightness of a certain amount or more even though it is a portion outside the comb pattern 80. It is analyzed whether there is any, and it is determined whether or not a sagging has occurred.

As described above, as a result of narrowing down the analysis target area, the analysis operation of the computer section 6 is extremely shortened as compared with the case of analyzing all image data.

Blooming is detected as shown in FIG.
As shown in, among the images taken by the video camera 1,
The peak value measuring unit 2 measures the peak value of the luminance of 250 lines which are the scanning lines near the bottom of the display screen.
This measured value is sent to the computer section 6, and when the measured value exceeds the reference value P (v), the computer section 6 determines that blooming appears.

In this case as well, since only the peak value of the luminance of one scanning line is detected, much detection time is not required.

In this way, the video camera 1
While the sag and blooming are detected in the video image captured in step S <b> 7, the driver unit 7 continues to drive according to a command from the computer unit 6 and gradually increases the Vsub voltage.
When the sagging and blooming are no longer detected from the image, the computer section 6 stops the driving of the driver section 7.

Various modifications can be made in carrying out the present invention. As the pattern matching method, a method other than the circular holes 81 and 82 may be used. The comb pattern 80 itself may be selected for pattern matching. Also, the cutout pattern 80 of the dedicated chart 8
Can also be used with patterns other than comb-shaped. The scanning line for blooming detection is not limited to 250 lines as long as it is below the display screen.

[0027]

As is apparent from the above description of the embodiments, the Vsub automatic adjusting apparatus according to the present invention can accurately adjust the Vsub voltage of the image pickup camera using the CCD in a short time. It is possible to introduce it into the adjustment line of the manufacturing site where the number of

By providing the comb-shaped pattern and the circular hole pattern for positioning on the dedicated chart, the operation of determining the read area can be performed quickly.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a Vsub automatic adjustment device of the present invention,

2A and 2B are views for explaining the adjustment operation of the Vsub automatic adjustment device according to the embodiment, which is a screen (a) showing a dedicated chart, a view (b) showing a read area of image data, and a change in brightness of a scanning line due to blooming. FIG.

FIG. 3 is a diagram (b) showing a dedicated chart (a) used for adjusting a conventional Vsub voltage and a video screen thereof.

[Explanation of symbols]

 1 Video Camera 2 Peak Value Measurement Unit 3 A / D Converter 4 Digital Image Memory 5 Readout Area Designation Unit 51 Binarization Converter 52 Binary Memory 53 Matching Memory 54 Pattern Readout Start Point / End Point Calculation Section 6 Computer Part 7 Driver part 8, 9 Special chart 80, 90 Cutout pattern 81, 82 Circular hole 10 Backlight

Claims (2)

[Claims] 1. A V of the image pickup camera, wherein a dedicated chart is photographed by the image pickup camera and a CCD is used based on the image.
In a Vsub automatic adjustment device for adjusting a sub voltage, a digital image memory for storing a digital image of a video image of the dedicated chart, and a read area designating unit for designating a part of the pattern of the dedicated chart in the digital image as a read area. And a peak value measuring means for measuring the peak value of the luminance of the scanning line at the bottom of the image display screen by the image pickup camera, and analyzing the digital image data designated in the readout area and comparing the peak value with a reference value. An automatic Vsub adjusting apparatus comprising: a determining unit that determines the degree of adjustment of the Vsub voltage by doing so; and an adjusting unit that adjusts the Vsub voltage of the imaging camera based on the determination made by the determining unit. 2. The dedicated chart comprises a comb-shaped pattern formed by cutting out a black plate, and circular hole patterns formed at both ends of the contour line of the bottom side of the comb-shaped shape, and the center position of the circular hole. 2. The Vsub automatic adjusting device according to claim 1, wherein a line connecting the lines is coincident with the contour line.