JP2002001638A - Aligning-method and layout block device for spectacle lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently align a spectacle lens with a lens holder with high accuracy at a low cost and in a short time. SOLUTION: A lens meter 5 photographs the spectacle lens as an object to be machined. An image processor 6 binarizes a photographed image, extracts characteristic parameters of individual graphic forms contained in the binarized image, extracts graphic forms, the characteristic parameters of which meet designated conditions as a hide mark previously formed on the spectacle lens, obtains the reference position according to the position of the hide mark, and obtains deviation of angle of the spectacle lens. A host computer 9 angle-corrects layout data corresponding to the spectacle lens as the object to be machined according to the deviation of angle, and according to the corrected layout data, the machining center position is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for positioning a processing lens of a spectacle lens such as a progressive multifocal lens and the like, and to a layout block device for mounting a processing jig at the processing center position. is there.

[0002]

2. Description of the Related Art When an unprocessed spectacle lens is mounted on a spectacle frame desired by a wearer, an edge processing of the spectacle lens is performed according to the shape of the spectacle frame. At this time, processing is performed using the eye point of the spectacle lens as the processing center so that the center of the pupil of the wearer and the eye point of the spectacle lens match. Since the eye point of a spectacle lens cannot be displayed directly on the lens surface, in the design of a spectacle lens, especially a progressive multifocal lens, a mark called a hidden mark is formed in advance at a predetermined distance from the geometric center. In addition, the geometric center of the lens, the optical centers of the distance portion and the near portion, the position of the eye point, and the like can be derived from the position of the hidden mark. Hidden marks are
When the spectacle lens is formed, for example, 0.004
It is formed in the form of minute irregularities of about mm.

FIG. 9 shows an unprocessed progressive multifocal lens.
100 is a progressive multifocal lens made of plastic, 101
Is a geometric center, 102 is a horizontal reference line passing through the geometric center 101, and 103a and 103b are hidden marks. The hidden marks 103a and 103b are formed in a combination of a circle and a character or in the form of two circles at two positions on the horizontal reference line 102 and at the same distance (for example, 17 mm) from the geometric center 101. .

Below the hidden marks 103a and 103b, a numeral 104a indicating the addition power of the progressive multifocal lens 100 (difference between the outer vertex refractive power of the far vision portion and the outer vertex refractive power of the near vision portion); Identification mark 104b indicating the type of lens
Are formed in the form of minute unevenness like the hidden marks 103a and 103b. Numeral 104a representing the addition frequency
Is displayed as a three-digit number (for example, 300) below the hidden mark located on the ear side when worn. Therefore, this 3
By knowing whether the digit 104a is formed below the left or right hidden mark, it is possible to identify whether the digit is a left-eye lens or a right-eye lens. The progressive multifocal lens 100 shown in FIG. 9 is a lens for the right eye. One hidden mark 103a is circular, and the other hidden mark 103b is a letter "H" representing a manufacturer.

In FIG. 9, reference numeral 105 denotes a distance power measuring unit, 106 denotes a near power measuring unit, 107 denotes a distance viewing unit for viewing a distance, 108 denotes a near viewing unit for viewing a close distance, 109
Is a progressive part whose frequency continuously changes, and 110 is an eye point. The eye point 110 is determined at a position above the geometric center 101 by a predetermined distance (for example, 2 mm). FIG. 10 shows another example of the progressive multifocal lens 100. The progressive multifocal lens 100 shown in FIG. 10 is a lens for the right eye, and the hidden marks 103a and 103c are both circular.

[0006] Hidden marks 103a, 103b, 103c
When searching for the position of the eye point 110 from the above, the progressive mark multifocal lens 100 is held over a light source such as a fluorescent lamp to visually search for the hidden marks 103a, 103b, 103c, and the position is marked with a marker. The focal lens 100 is placed on a progressive multifocal lens sheet called a remark chart. The remark chart shows a full-size progressive multifocal lens in which each position of a hidden mark, a geometric center, a distance power measuring unit, a near power measuring unit, and an eye point is described for each lens type. .

When the progressive multifocal lens 100 is placed on the remark chart, the positions of the hidden marks 103a, 103b, 103c marked on the lens 100 and the hidden marks of the same type of lens described on the remark chart Are matched, and the position of the eye point described in the remark chart is set as the position of the eye point 110, and the same position of the progressive multifocal lens 100 is marked with a marker. Then, a processing jig (lens holder) is mounted at the position of the eye point 110 of the progressive multifocal lens 100, and the eye point 110 of the progressive multifocal lens 100 is aligned with the center of the pupil of the wearer. Multifocal lens 10 centered on machining
0 is edged to match the outer shape of the lens 100 with the frame shape of the spectacle frame.

However, in the method using the remark chart, since the operation is performed manually by the operator, the operation is inefficient and the burden on the operator is large, and an error in positioning the progressive multifocal lens 100 and the lens holder is large. There was a problem. Therefore, the hidden marks 103a, 103b, 10
As a technique for detecting the position 3c of the progressive multifocal lens 100 and automatically and automatically aligning the lens holder with the progressive multifocal lens 100, the progressive multifocal lens 100 is optically enlarged and imaged. Hidden marks 103a, 103b, 103c from an input image by template matching for comparing prepared partial images (templates)
A method of detecting the position of the eye point 110 and calculating the position of the eye point 110 from this position is known.

[0009] The progressive multifocal lens 100 is optically magnified and imaged by the hidden marks 103a, 103b, 10
This is because, if the 3c is imaged without optically enlarging it, it has only a size of about several pixels, while using template matching requires a size of at least about 10 × 10 pixels. According to the method using this template matching, highly accurate positioning of the progressive multifocal lens 100 and the lens holder can be performed.

[0010]

However, in the method using template matching, a magnifying optical system for optically enlarging the progressive multifocal lens 100 to take an image is required. There was a problem that it took time. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a position of a spectacle lens capable of performing high-precision alignment of a progressive multifocal lens and a lens holder with high efficiency and in a short time at a lower cost than before. It is an object of the present invention to provide a matching method and a layout block device.

[0011]

According to the present invention, there is provided a method of aligning a spectacle lens according to the present invention. A geometric feature parameter of the figure is extracted, and a figure whose feature parameter satisfies a predetermined condition is represented by a hidden mark (103a, 103b, 1) previously formed on the spectacle lens.
03c), and a procedure for obtaining, on the binary image, a reference position (C, 101) having a predetermined positional relationship with the processing center position (110) based on the position of the extracted hidden mark. It has. Since there is a common positional rule for all spectacle lenses between the hidden mark and the reference position (the geometric center in the case of a progressive multifocal lens),
If the hidden mark is detected by image processing, the reference position of the spectacle lens can be obtained. The relationship between the reference position and the processing center position differs for each spectacle lens.

Further, in one configuration example of the eyeglass lens positioning method of the present invention, at least two hidden marks formed in advance on the eyeglass lens are extracted on a binary image, and the eyeglass lens is positioned based on the positions of the hidden marks. The angle deviation (θ) with respect to the normal position of the lens is obtained. Also,
In one configuration example of the eyeglass lens alignment method of the present invention, the layout data representing the positional relationship between the reference position and the processing center position is angle-corrected according to the angle shift, and the processing center is corrected based on the angle-corrected layout data. The position is obtained. Also, one configuration example of the eyeglass lens alignment method of the present invention extracts at least two hidden marks formed in advance on the eyeglass lens on a binary image, and based on the positions of the hidden marks, extracts the hidden marks to the eyeglass lens. Characters indicating a pre-formed addition power are detected on a binarized image, and it is determined whether the eyeglass lens is a right-eye lens or a left-eye lens based on the position of the detected character. It is. Also, one configuration example of the eyeglass lens alignment method of the present invention extracts at least two hidden marks formed in advance on the eyeglass lens on a binary image, and based on the positions of the hidden marks, extracts the hidden marks to the eyeglass lens. A character representing an addition power formed in advance is detected on the binarized image, and the position of the detected character is used to determine whether the eyeglass lens is up or down.

The layout of the spectacle lens of the present invention
The block device includes: a photographing unit (5) for photographing an image of a spectacle lens to be processed;
A geometric feature parameter of each figure included in the binarized image is extracted, and a figure whose feature parameter satisfies a predetermined condition is extracted as an image of a hidden mark formed on a spectacle lens in advance, and the extracted hidden mark is extracted. Based on the position of the mark,
Image processing means (6) for obtaining, on a binary image, a reference position having a predetermined positional relationship with the processing center position. Further, as one configuration example of the spectacle lens layout / block apparatus of the present invention, the image processing means extracts at least two hidden marks formed in advance on the spectacle lens on a binary image, and extracts the hidden marks at the positions of the hidden marks. The angle deviation of the spectacle lens with respect to the normal position is determined based on the angle deviation.
One configuration example of the layout block device for spectacle lenses of the present invention stores layout data representing a positional relationship between a reference position and a processing center position for each spectacle lens in advance,
Arithmetic means (9) for correcting the angle of the layout data corresponding to the eyeglass lens to be processed in accordance with the angle shift and obtaining the processing center position based on the layout data after the angle correction.
It has.

[0014]

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a layout block device for a progressive multifocal lens according to an embodiment of the present invention. The layout block device for a progressive multifocal lens according to the present embodiment is installed adjacent to a edging device (not shown), and images the progressive multifocal lens 100, based on the captured image. A layout process for determining the right and left of the progressive multifocal lens 100 and calculating an attachment position and an attaching angle of a processing jig (hereinafter, referred to as a lens holder) to be attached to the progressive multifocal lens 100; And a block process for attaching the progressive multifocal lens 100 after the lens holder is attached to the edging apparatus.

This layout / block device includes a holder supply device 1 for supplying a lens holder, a seal supply device 2 for supplying an elastic seal described later, and a lens supply device 3 for supplying a progressive multifocal lens 100 to be processed. A holder holder 4 for attaching the lens holder supplied by the holder supply device 1 to the processing center of the progressive multifocal lens 100, a lens meter 5 serving as a photographing unit for photographing the progressive multifocal lens 100, and photographing by the lens meter 5. The image processing device 6 that determines the left and right sides of the progressive multifocal lens 100 based on the obtained image to calculate the mounting position and the mounting angle of the lens holder, and rims the progressive multifocal lens 100 after the lens holder is mounted. A lens transport device 7 for transporting to the processing device, and a control device for controlling the entire layout / block device. 8, and a host computer 9 as a calculating means for controlling a layout block apparatus and edger.

FIG. 2 is a side view showing a state where a lens holder is attached to the progressive multifocal lens 100 via an elastic seal based on the result of image processing by the image processing device 6. Lens holder 200 made of metal such as stainless steel
Is formed into a flanged cylindrical body. The surface of the lens holder 200 to which the elastic seal 201 is attached (the lower surface of the holder 200) is a concave spherical lens holding surface corresponding to the convex lens surface of the progressive multifocal lens 100.

In this case, if a lens holding surface corresponding to the convex curve is formed for each lens, the type of the lens holder 200 itself increases. The number of types of 200 is reduced so that one type of lens holder 200 can hold several types of progressive multifocal lenses 100 having different convex curves.

The elastic seal 201 has a thickness of 0.5-0.
Lens holder 2 with outer diameter of about 6 mm thin rubber
00 is larger than the outer diameter of the lens holding surface (about 22 mmφ), and the inner diameter is smaller than the hole diameter of the lens holder 200 (8
(about mm) A ring-shaped one having both sides coated with an adhesive is used.

FIG. 3 is a block diagram showing the structure of the lens meter 5. The lens meter 5 includes a progressive multifocal lens 10
A light source 31 illuminating 0, a condenser lens 32 disposed in an optical path between the light source 31 and the progressive multi-focal lens 100, an aperture 33, a half mirror 34, and the progressive multi-focal lens 100 are fixed by suction. The lens holding device 35 and the hidden marks 103a and 103 of the progressive multifocal lens 100
b, number 104a indicating the addition power and identification mark 104
The rotating screen 36 on which the image b is projected, the condenser lenses 37 and 38 disposed between the rotating screen 36 and the progressive multifocal lens 100, the projection lens 39, and the reflected light from the rotating screen 36. And a motor 41 for rotating the rotating screen 36.

The light sources 31 used for projection of the progressive multifocal lens 100 include hidden marks 103a and 103b,
Light with a narrow emission spectrum width, for example, an LED of red light is used so that the numeral 104a and the identification mark 104b can be well projected, and is disposed on the convex surface side of the progressive multifocal lens 100. The half mirror 34 has, for example, a transmittance of 70% and a reflectance of 30%, and the image pickup device 40 is provided correspondingly.

On the rotating screen 36, a reflection sheet having a surface coated with fine powder of glass, aluminum or the like is attached to increase the reflectance. In addition, the rotating screen 36 is rotated at high speed (for example, 3400 rpm) by the motor 41 in order to make the surface brightness uniform. The cylindrical lens holding device 35 that holds the progressive multifocal lens 100 includes hidden marks 103a and 103b, numerals 104a.
And has an outer diameter sufficiently small (for example, 8 mmφ) so as not to hinder the photographing of the identification mark 104b.

FIGS. 4 to 6 are flowcharts showing the operation of the layout block device of FIG. The operation of the layout / block device will be described below with reference to FIGS. First, the lens supply device 3 places one progressive multifocal lens 100 (hereinafter, referred to as a processing target lens 100) to be subjected to edging processing, with its convex surface facing upward, under the control of the control device 8, with the lens meter 5 Lens holding device 3
5. Place on top. The lens holding device 35 evacuates the inside of the lens support cylinder to thereby process the lens 10 to be processed.
0 is suction-fixed to the upper opening of the lens support cylinder (step S1 in FIG. 4).

The holder supply device 1 supplies the lens holders 200 one by one to the holder holding device 4 under the control of the control device 8. The elastic seal 201 is loaded in the seal supply device 2 in the form of a roll. This roll has a surface covered with protective paper. The seal supply device 2 controls the elastic seal 201 according to the control of the control device 8.
Are supplied to the holder holding device 4 in a state where the protective paper is peeled off one by one.

The holder holding device 4 includes a lens holder 200
Receiving the elastic seal 201 and the lens holder 200
Is held, and an elastic seal 201 is stuck on the lens holding surface of the lens holder 200, and a standby state is prepared for attachment of the lens holder 200 to the processing target lens 100 (step S2).

Next, the controller 8 turns on the light source 31 of the lens meter 5 (step S3). Subsequently, the image processing device 6 resets and activates the time-up timer for image processing to 0 according to the instruction of the control device 8, and starts time measurement (step S4). This time-up timer is for measuring the elapsed time of the image processing for one processing target lens 100.

The illumination light from the light source 31 passes through the condenser lens 32, the aperture 33, and the half mirror 34 and irradiates the lens 100 to be processed. Thereby, the hidden marks 103a, 103 formed on the surface of the processing target lens 100 are formed.
03b, the image of the numeral 104a and the identification mark 104b are:
The light is condensed by the converging lenses 37 and 38,
9 projected onto a rotating screen 36. The image projected on the rotating screen 36 is a projection lens 39,
The light is reflected by the half mirror 34 through the condenser lenses 38 and 37 and projected on the light receiving surface of the imaging device 40. Imaging device 4
0 outputs an image signal by photoelectrically converting the image projected on the light receiving surface.

The image processing device 6 A / D converts the image signal output from the imaging device 40 of the lens meter 5, and temporarily stores the A / D converted image data in an internal memory (step S5). ). Subsequently, the image processing device 6
Starts image processing on the input image stored in the memory. FIG. 7 and FIG. 8 are explanatory diagrams showing a state of image processing by the image processing device 6. FIG.

First, the image processing device 6 compares the input image shown in FIG. 7A with a predetermined first threshold value, and determines pixels having a luminance value equal to or greater than the first threshold value. From the input image, a background area is removed from the input image, and a lens area is cut out. The image of the lens area is stored in the memory (Step S6).

Subsequently, the image processing device 6 calculates the difference between the image after the static threshold processing stored in the memory and the blurred image and the image after the static threshold processing by the pixel processing. The value calculated for each pixel is set to “1” for a pixel whose calculated difference is equal to or greater than a predetermined second threshold, and set to “0” for a pixel whose difference is smaller than the second threshold. The image after the static threshold processing is binarized by performing the dynamic threshold processing (step S7).

In the dynamic threshold processing, the contour is sharpened by the difference processing, and the portion where the difference output is large, that is, the portion which seems to be the contour of the object is set to “1”, and the other portions are set to “0”. Therefore, even if there is slight illumination unevenness or halation when photographing the processing target lens 100, it is possible to extract the shapes of the hidden marks 103a and 103b, the numeral 104a, and the identification mark 104b.
By the dynamic threshold processing, an image as shown in FIG. 7B is obtained. The image processing device 6 stores the image after the dynamic threshold processing in the memory.

The image after the binarization has a lens 10 to be processed.
In many cases, dust and dirt on the surface of No. 0 are included, and the binarized hidden mark itself is often partially missing.
Therefore, since the hidden marks 103a and 103b cannot be detected with the binary image obtained by the dynamic threshold processing as it is, the removal of the noise component and the repair of the loss of the hidden marks 103a and 103b are performed as follows. And so on to detect the hidden marks 103a and 103b.

The image processing device 6 regards a set of connected pixels “1” in the binarized image after the dynamic threshold processing as one connected component, and assigns the same pixel to each pixel in the same connected component. After performing a labeling process for giving a label (number or name), a geometric feature parameter of each connected component is extracted and stored in a memory. Here, as the characteristic parameters of each connected component, the area (number of pixels of the connected component) S of the connected component and the ratio (L1 / L2) of the major axis L1 and the minor axis L2 shown in FIG. 7C are extracted. In FIG. 7, FIG.
In (c) and thereafter, the area of the pixel “1” is indicated by oblique lines.

Then, the image processing device 6 determines that the area S is within the predetermined first area range and the ratio of the major axis L1 to the minor axis L2 is a preset ratio threshold (for example, 1. 2) The following connected components are extracted as circular hidden mark candidate areas (hereinafter referred to as ○ similar areas), and the positions of the extracted 類似 similar areas are stored in a memory (step S8). In this way, for example, a similar area as shown in FIG. 7D can be extracted.

The similar region contains a noise component having a protruding shape. Therefore, the image processing device 6 contracts the extracted o similar region once by a predetermined number of pixels, expands the same region by the same number of pixels, and restores the original region. ○ When the similar area is contracted, the protruding noise component disappears.
If the similar region is expanded and returned to its original state, the protruding noise component can be removed from the similar region (step S).
9).

Further, the ○ similar area includes noise components such as holes and loss. Therefore, the image processing apparatus 6 removes noise components such as holes and defects from the similar region by expanding the similar region after removing the protruding noise component by a predetermined number of pixels, thereby reducing the shape. Correction is performed (step S10). As a result, a circle-like area after shape correction as shown in FIG. 7E is obtained.

Subsequently, the image processing device 6 fills the inside of each of the similar regions after the shape correction with the pixel “1” as shown in FIG. Extract parameters and store them in memory. Again, as the characteristic parameters, the area S of each similar region, the major axis L1 and the minor axis L
Extract the ratio of 2.

The image processing device 6 is designed so that the area S is within a predetermined second area range and the major axis L1 and the minor axis L2
Is extracted as the most probable candidate area of the circular hidden mark (hereinafter referred to as the “area”), and the position of the extracted area is stored in the memory (step S11). Then, the image processing device 6
Counts the number of extracted o regions and stores it in the memory (step S12).

Next, the image processing device 6 performs a labeling process on the binarized image after the dynamic threshold value process, and then extracts a geometric feature parameter of each connected component, and To be stored. Here, the area S, the major axis L1, and the minor axis L2 of the connected component are extracted as the characteristic parameters of each connected component.

The image processing device 6 determines that the area S is within the preset third area range, the major axis L1 is within the preset major axis range, and the minor axis L2 is within the preset minor axis range. A certain bar-shaped connected component is extracted as a region likely to be a component of the H-shaped hidden mark, and the position of the extracted bar-shaped connected component is stored in a memory (step S13). Thus,
For example, an area as shown in FIG. 7 (g) can be extracted.

The three bar-shaped areas shown in FIG.
It is shaped like a shape, but not connected. Therefore, the image processing device 6 expands the extracted bar-shaped area by a predetermined number of pixels (for example, about two pixels),
These areas are connected to obtain an H-shaped hidden mark candidate area (hereinafter, referred to as an H-like area) (step S1).
4). As a result, H after shape correction as shown in FIG.
A similar region is obtained.

Subsequently, the image processing device 6 temporarily contracts the H-like area after shape correction by a predetermined number of pixels, expands the H-like area by the same number of pixels, and restores the original H-like area. A noise component is removed (step S15),
The geometric feature parameters of the H-like area after the removal of the noise component are extracted and stored in the memory. Here, H
As a feature parameter of the similar region, H shown in FIG.
The ratio (HT / W) between the height HT and the width W of the similar region (HT / W), the degree of convexity (the degree of showing the concave shape of the figure in the two-dimensional plane), the diameter D of the circle circumscribing the H similar region, And the distance from it. The degree of convexity is less than 1 if the circle has a dent or hole.

The image processing device 6 determines that the ratio of the height HT to the width W is within a preset ratio range, the convexity is within a predetermined range (for example, 0.6 to 0.7), and the diameter of the circumscribed circle is An H-like area in which D is within a predetermined diameter range and a distance from the O area is within a predetermined distance range is the most probable candidate area for an H-shaped hidden mark (hereinafter, referred to as an H area). And the position of the extracted H area is stored in the memory (step S16). Then, the image processing device 6 counts the number of the extracted H regions and stores the number in the memory (Step S).
17).

Next, the image processing device 6 proceeds to step S12.
It is determined whether the number of ○ areas counted in step 2 is 2 (step S1).
8) If the number of ○ regions is not 2, it is determined whether the number of ○ regions is 1 or not (step S19).
It is determined whether the number of H regions counted in step S17 is 1 (step S20). If the number of areas is neither 2 nor 1, or if the number of areas is 1 and the number of H areas is not 1, the image processing device 6 sets the elapsed time during measurement by the time-up timer to a predetermined second (for example, 4 seconds). It is determined whether or not it has exceeded (step S21).

If the elapsed time does not exceed the predetermined second, the image processing device 6 executes the processing of steps S5 to S20 again. Thus, when the number of 領域 areas is neither 2 nor 1, or when the number of 領域 areas is 1 and the number of H areas is not 1 (ie, when anything other than the hidden marks 103a and 103b is detected), and the elapsed time is a predetermined second If not, the processing of steps S5 to S20 is repeatedly executed.

If the elapsed time exceeds the predetermined number of seconds in step S21, the image processing device 6 determines that the hidden marks 103a and 103b cannot be detected by the image processing, and informs that the image processing cannot be performed. Image processing disable error processing to be notified to the control device 8 is performed. Upon receiving the notification, the control device 8 performs processing such as discharging the processing target lens 100 in which the image processing impossible error has occurred from the layout block device.

On the other hand, when the number of ○ regions is 2, or when both the number of ○ regions and the number of H regions are 1, the image processing device 6 determines the distance between the two ○ regions or the distance between the ○ region and the H region. Then, it is determined whether or not this distance is within a certain range around a predetermined value (for example, 34 mm) (step S2).
2). If the obtained distance is not within a certain range centered on the predetermined value, the process proceeds to step S21.

Next, the obtained distance is within a certain range centered on a predetermined value, and both the number of areas and the number of H areas are 1
In the case of (YES in step S23 in FIG. 5), the image processing device 6 sets the center of the smallest circumscribed circle of the O region as the center of the O region, the center of the smallest circumscribed circle of the H region as the center of the H region, The center coordinates of the area and the center coordinates of the H area are calculated and stored in the memory (step S24).

Subsequently, the image processing device 6 calculates the coordinates of the middle point (reference position) C between the center of the area O and the center of the H area as shown in FIG. 8A and stores it in the memory (step S2).
5) Further, a line segment V (a vector extending from the O region to the H region) connecting the center of the O region and the center of the H region is obtained, and this vector V and the horizontal reference line 1 of the layout block device are obtained.
02 (the rotation angle of the processing target lens 100 with respect to the horizontal reference line 102) θ is calculated and stored in the memory (step S26). In the processing target lens 100, an angular displacement occurs at the time of supply to a position that should be originally on the layout block device. The process in step S26 is a process for obtaining this angle shift.

Next, the image processing apparatus 6 is located on one of the right and left sides (the left side in the present embodiment) when the H region is viewed from the O region, and each of the O region and the H region Two rectangular areas A of a predetermined size, separated from the center by a predetermined distance in a direction perpendicular to the vector V
1 and A2 are cut out from the binarized image after the dynamic threshold processing (step S27).

Then, the image processing device 6
Since the two rectangular areas A1 and A2 are obliquely inclined by the rotation angle θ, the rectangular areas A1 and A2 are rotated by the rotation angle θ so as to be parallel to the horizontal reference line 102 (step S28). The reason why the rectangular areas A1 and A2 are rotated is that the characters can be cut out favorably in the next character count processing.

The image processing device 6 cuts out the characters in the rectangular areas A1 and A2 after the rotation processing one by one,
The number of characters in the rectangular areas A1 and A2 is counted and stored in the memory (step S29). The size and character pitch of characters formed as the numerals 104a and the identification marks 104b on the progressive multifocal lens 100 are known. Therefore, the image processing device 6 shrinks the images in the rectangular areas A1 and A2 only in the horizontal direction to remove noise components such as short-circuits between the characters, and then performs a preprocessing technique used in the character recognition technology. Use to cut out characters. That is, the image processing device 6 detects periodic spaces between characters based on the character pitch, detects a character area based on the character size, and determines a character cutout position.

Next, the image processing device 6 determines whether the lens 100 to be processed is a right-eye lens or a left-eye lens (step S30). Circular hidden mark 103a
In the case of the progressive multifocal lens 100 in which the hidden mark 103b of H-shape is formed in advance, the hidden mark 103a
And a numeral 104a representing the addition power, a hidden mark 103b on the nose side and an identification mark 104b representing the type of lens. Therefore, when looking at the H region from the ○ region,
If the numeral 104a and the identification mark 104b are on the right side, the lens is for the right eye (FIG. 9), and if the numeral 104a and the identification mark 104b are on the left side, the lens is for the left eye (FIG. 8A).
It is.

In the present embodiment, the rectangular areas A1 and A2 on the left side when the H area is viewed from the circle area are cut out by the processing in step S27. Therefore, the image processing device 6 determines that the lens is for the left eye when the number of characters counted in step S29 is within a certain range (for example, three or more and seven or less), and when the number of characters is not within the certain range. It is determined that the lens is for the right eye. In the case of a lens for the right eye, the number of characters in the rectangular areas A1 and A2 should be 0, and in the case of a lens for the left eye, the number of characters should be 5, but in consideration of erroneous recognition of characters. If the number of characters is within a certain range, it is determined that the lens is for the left eye.

Next, the image processing apparatus 6 determines whether the numeral 104a and the identification mark 104b are below the hidden marks 103a and 103b (step S31).
For example, when it is determined in step S30 that the lens is for the right eye, the numeral 104a and the identification mark 104b are below the hidden marks 103a and 103b when the vector V is directed right, and are hidden when the vector V is directed left. It is above the marks 103a and 103b. When it is determined that the lens is for the left eye, the numeral 104a and the identification mark 104
b is a hidden mark 103 if the vector V is facing left.
a, 103b, and if the vector V is facing right, it is above the hidden marks 103a, 103b.

If the numeral 104a and the identification mark 104b are above the hidden marks 103a and 103b, the image processing device 6 determines that the lens 100 to be processed is upside down and out of the permissible range of the layout block device. 8
Perform upside down error processing to notify. Upon receiving the notification, the control device 8 performs processing such as discharging the processing target lens 100 in which the upside-down error has occurred from the layout block device.

When the numeral 104a and the identification mark 104b are below the hidden marks 103a and 103b, the image processing apparatus 6 determines whether the rotation angle θ is within a preset range (for example, ± 60 °). A determination is made (step S32). If the rotation angle θ is not within the preset range, the image processing device 6 notifies the control device 8 that the rotation angle of the processing target lens 100 is out of the allowable range of the layout block device. I do. Upon receiving the notification, the control device 8 performs processing such as discharging the processing target lens 100 in which the angle over error has occurred from the layout block device.

If the rotation angle θ is within the preset range, the image processing device 6 proceeds to step S44 in FIG. On the other hand, the distance obtained in step S22 is within a certain range centered on the predetermined value, and
In the case of (NO in step S23 in FIG. 5), the image processing apparatus 6 sets the center of the minimum circumscribed circle of each o region as the center of each o region, calculates the center coordinates of the two o regions, and stores the coordinates in the memory. (Step S33).

Subsequently, as shown in FIG. 8B, the image processing device 6 sets the intermediate point C (geometric center 1) between the centers of the two circles.
01) is calculated and stored in the memory (step S3).
4) Further, a line segment V connecting the centers of the two circles is obtained,
Angle (rotation angle) between the line segment V and the horizontal reference line 102
θ is calculated and stored in the memory (step S35).

Next, the image processing device 6 comprises four rectangular areas B1 to B4 of a predetermined size, which are separated from the center of each o area by a predetermined distance in a direction perpendicular to the line segment V.
One of them is cut out from the binarized image after the dynamic threshold processing (step S36). Then, the image processing device 6
Rotates one cut-out rectangular area by the rotation angle θ so as to be parallel to the horizontal reference line 102 (step S37).

The image processing device 6 counts the number of characters in the rectangular area after the rotation process in the same manner as in step S29, and stores it in the memory (step S38). Next, the image processing device 6
Determines whether the number of characters counted in step S38 is 3 (step S39). If the number of characters is not 3, the image processing device 6 selects another rectangular area from the four rectangular areas B1 to B4 (steps S40 and S41),
The processing of steps S36 to S39 is performed.

If the number of characters in the four rectangular areas B1 to B4 is sequentially counted and there is no rectangular area having three characters, the image processing apparatus 6 determines that the left / right determination by the image processing is impossible, and the host computer 9 After performing RL determination disable processing for determining whether the processing target lens 100 is a right-eye lens or a left-eye lens based on information notified in advance from step S32, the process proceeds to step S32.

On the other hand, when the number of characters is 3 in any of the rectangular areas B1 to B4, the image processing device 6 determines whether the lens 100 to be processed is a right-eye lens or a left-eye lens. (Step S42). In the case of the progressive multifocal lens 100 in which two circular hidden marks 103a and 103c are formed in advance, there is a three-digit number 104a indicating the addition power on the ear side, and an identification mark 104b indicating the lens type on the nose side. is there. Therefore, if the rectangular area having three characters is one of the rectangular areas B1 and B3 shown in FIG. 8B, it is a lens for the right eye (FIG. 21) and the rectangular areas B2 and B4
If any of the above, the lens is for the left eye (FIG. 8B).

Next, the image processing apparatus 6 determines whether the numeral 104a and the identification mark 104b are below the hidden marks 103a and 103c (step S43).
The numeral 104a and the identification mark 104b are located below the hidden marks 103a and 103c if the rectangular area with three characters is any of the rectangular areas B3 and B4, and the rectangular area with three characters is one of the rectangular areas B1 and B2. If so, it is above the hidden marks 103a and 103c.

When the numeral 104a and the identification mark 104b are above the hidden marks 103a and 103c, the image processing device 6 performs the upside-down error processing as described above.
When the numeral 104a and the identification mark 104b are below the hidden marks 103a and 103c, the image processing device 6 performs the processing of step S32 described above.

Next, in step S44, the image processing device 6 transmits the result of the left / right determination of the processing target lens 100, the calculated coordinates of the intermediate point C, and the rotation angle θ to the control device 8, and the control device 8 Then, the result of the left / right determination of the processing target lens 100 and the rotation angle θ are transmitted to the host computer 9. Further, the control device 8 controls the light source 31 of the lens meter 5.
Is turned off (step S45).

The host computer 9 reads the bar code attached to the tray of the processing target lens 100 with a bar code reader when the processing target lens 100 is supplied to the layout / block device, so that the processing target lens 100 can be used for the right eye.
Which lens for the left eye is used is recognized in advance.
The host computer 9 collates the result read from the barcode with the result of the left / right determination sent from the control device 8 so that the content represented by the barcode and the actual processing target lens 100 placed on the tray can be determined. You can check if they match.

Then, the host computer 9 converts the layout data (data representing the mutual positional relationship between the geometric center 101, the hidden marks 103a and 103b, and the eye point 110) of the lens to be processed 100 stored in advance into the rotation angle θ. , And then calculates block data (data representing the position of the eye point 110 based on the geometric center 101) based on the layout data after the angle correction, and transmits the block data to the control device 8 (step S4).
6).

The intermediate point C detected by the image processing device 6 is the geometric center 101 of the lens 100 to be processed. At this time, the intermediate point C is the horizontal direction (horizontal direction in FIG. 8) and the vertical direction (supply direction in FIG. 8). The position is shifted from the original position on the layout block device due to the position shift (vertical direction in FIG. 8). In other words, the processing target lens 100 is displaced horizontally and vertically. On the other hand, the block data is calculated on the assumption that there is no positional deviation in the horizontal and vertical directions, although the angular deviation of the processing target lens 100 is corrected as described above.

Therefore, the control device 8 controls the lens supply device 3
When the processing target lens 100 is conveyed from the lens meter 5 to a predetermined lens holding position by the correction of the horizontal and vertical displacements of the processing target lens 100 based on the coordinates of the intermediate point C, the host Computer 9
The lens supply device 3 is controlled so that the eye point 110 of the processing target lens 100 is located directly below the lens holder 200 held by the holder holding device 4 based on the block data from (step S47).

Subsequently, the control device 8 controls the lens 1 to be processed.
In order to correct the angle deviation at the time of supplying 00, the holder holding device 4 is controlled to rotate the lens holder 200 by the rotation angle θ to perform the angle correction (step S48). Then, the control device 8 controls the holder holding device 4 to lower the lens holder 200 and attach the elastic seal 201 attached to the lens holder 200 to the lens 10 to be processed.
Press it to 0 to make it adhere. Thereby, as shown in FIG. 2, the lens holder 200 holds the processing center (eye point 11) of the processing target lens 100 via the elastic seal 201.
0) (step S49).

The control device 8 controls the holder holding device 4 to transport the lens holder 200 to a predetermined take-out position together with the lens 100 to be processed (step S50).
Subsequently, the lens transport device 7 is controlled to transport the processing target lens 100 at the take-out position to the edging device (step S51). Thus, one processing target lens 100
Is completed by the layout block device.

The lens 100 to be processed sent to the edging apparatus is subjected to edging processing such as beveling based on lens frame shape data and wearer's prescription data by the edging apparatus. A spectacle lens having a contour shape substantially matching the shape is manufactured.

[0073]

According to the present invention, an image of a spectacle lens to be processed is photographed and binarized, and geometric characteristic parameters of individual figures included in the binarized image are extracted. Since a figure whose parameters meet a predetermined condition is extracted as an image of a hidden mark, the time required for detecting a hidden mark can be reduced as compared with the conventional method using template matching, and the time required for template matching is reduced. Since the magnifying optical system becomes unnecessary, the cost can be reduced. Further, compared with a case where the operator manually aligns the eyeglass lens and the lens holder, highly accurate alignment can be realized, and the burden on the operator can be significantly reduced. As a result, highly accurate positioning of the spectacle lens and the lens holder can be performed efficiently and in a short time.

Further, at least two hidden marks formed in advance on the spectacle lens are extracted from the binary image, and an angle shift with respect to a regular position of the spectacle lens is obtained based on the position of the hidden mark, thereby correcting the angle. Then, the processing center position of the spectacle lens can be obtained, and the processing can be stopped for the spectacle lens with a remarkable angle shift.

Further, at least two hidden marks formed in advance on the spectacle lens are extracted from the binary image, and based on the positions of the hidden marks, characters representing the addition power formed in advance on the spectacle lens are converted into binary values. The eyeglass lens different from the desired lens is erroneously transmitted by detecting the eyeglass lens for the right eye or the left eye from the position of the detected character by detecting the eyeglass lens on the digitized image. It is possible to check whether or not the eyeglass lens has been sent by mistake, and if it is determined that the eyeglass lens has been sent by mistake, the processing of the eyeglass lens can be stopped.

Further, at least two hidden marks formed in advance on the spectacle lens are extracted from the binary image, and based on the position of the hidden mark, a character indicating the addition power formed in advance on the spectacle lens is converted into a binary value. By detecting the upper and lower sides of the spectacle lens from the position of the detected character by detecting on the coded image, it becomes possible to stop the processing of the spectacle lens supplied upside down.

Further, the layout data representing the positional relationship between the reference position and the processing center position is stored in another processing means different from the image processing means, and the processing means calculates the processing center position of the spectacle lens. It is not necessary to hold a large amount of data by the means, and registration of layout data according to the eyeglass lens to be processed becomes easy.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a layout block device for a progressive multifocal lens according to an embodiment of the present invention.

FIG. 2 is a side view showing a state where a lens holder is attached to a progressive multifocal lens via an elastic seal.

FIG. 3 is a block diagram showing a configuration of a lens meter of the layout / block apparatus of FIG. 1;

FIG. 4 is a flowchart showing an operation of the layout block device of FIG. 1;

FIG. 5 is a flowchart showing an operation of the layout block device of FIG. 1;

FIG. 6 is a flowchart showing an operation of the layout block device of FIG. 1;

FIG. 7 is an explanatory diagram showing a state of image processing by the image processing device of the layout / block device of FIG. 1;

8 is an explanatory diagram showing a state of image processing by an image processing device of the layout / block device of FIG. 1;

FIG. 9 is a plan view showing a positional relationship between a hidden mark, a geometric center, and the like of the progressive multifocal lens.

FIG. 10 is a plan view showing another example of a progressive multifocal lens.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Holder supply device, 2 ... Seal supply device, 3 ... Lens supply device, 4 ... Holder holding device, 5 ... Lens meter, 6
... Image processing device, 7 ... Lens transfer device, 8 ... Control device,
9 Host computer.

Claims (8)

[Claims] 1. A method of aligning a spectacle lens for obtaining a processing center position for mounting a processing jig on a spectacle lens to be processed, the method comprising: taking an image of the spectacle lens to be processed and binarizing the image; Extracting a geometric feature parameter of each figure included in the binarized image, and extracting a figure whose feature parameter satisfies a predetermined condition as an image of a hidden mark previously formed on the spectacle lens; Obtaining a reference position having a predetermined positional relationship with the processing center position on the binary image based on the position of the extracted hidden mark. 2. The eyeglass lens positioning method according to claim 1, wherein at least two of the hidden marks formed in advance on the eyeglass lens are extracted on the binary image, and based on the positions of the hidden marks. An eyeglass lens positioning method, wherein an angle shift from a regular position of the eyeglass lens is obtained. 3. The eyeglass lens positioning method according to claim 2, wherein layout data representing a positional relationship between the reference position and the processing center position is angle-corrected according to the angle shift, and the layout after the angle correction is performed. A method of positioning a spectacle lens, wherein the processing center position is obtained based on data. 4. The eyeglass lens positioning method according to claim 1, wherein at least two of the hidden marks formed in advance on the eyeglass lens are extracted on the binary image, and based on the positions of the hidden marks. Detecting a character representing an addition power formed in advance on the spectacle lens on the binarized image, and determining whether the spectacle lens is a right-eye lens or a left-eye lens based on the position of the detected character. A method for positioning a spectacle lens. 5. The eyeglass lens positioning method according to claim 1, wherein at least two of the hidden marks formed in advance on the eyeglass lens are extracted on the binary image, and based on the positions of the hidden marks. Detecting, on the binarized image, a character representing an addition power formed in advance on the spectacle lens, and determining whether the spectacle lens is up or down based on the position of the detected character. Method. 6. A spectacle lens layout / block device for determining a processing center position of an eyeglass lens to be processed, and attaching a processing jig to the processing center position, wherein a photographing means for photographing an image of the eyeglass lens to be processed. Binarizing the photographed image, extracting geometric feature parameters of individual figures included in the binarized image, and preliminarily providing a figure whose characteristic parameter meets a predetermined condition to the spectacle lens. Image processing means for extracting a reference position having a predetermined positional relationship with the processing center position on the binary image based on the position of the extracted hidden mark and extracting the image as a formed hidden mark image. Characteristic eyeglass lens layout / block device. 7. The spectacle lens layout block device according to claim 6, wherein the image processing means extracts at least two of the hidden marks formed in advance on the spectacle lens on the binary image. A spectacle lens layout block device, wherein an angle shift of the spectacle lens with respect to a regular position is obtained based on a position of a hidden mark. 8. The spectacle lens layout block device according to claim 7, wherein layout data representing a positional relationship between the reference position and the processing center position is stored in advance for each spectacle lens, and the spectacle lens to be processed is provided. 2. A spectacle lens layout block device, comprising: an arithmetic unit for correcting an angle of layout data corresponding to the angle according to the angle shift, and obtaining the processing center position based on the layout data after the angle correction.