CN1119647C

CN1119647C - Surface topography enhancement

Info

Publication number: CN1119647C
Application number: CN 95197802
Authority: CN
Inventors: A·马林卡克
Original assignee: National Research Council of Canada
Current assignee: National Research Council of Canada
Priority date: 1995-02-14
Filing date: 1995-02-14
Publication date: 2003-08-27
Anticipated expiration: 2015-02-14
Also published as: CN1179827A

Abstract

The present invention relates to an apparatus for producing an object image with surface topography enhancement, which comprises a light source for producing a light beam for illuminating an object, wherein the light beam has a zone, in which light intensity falls off rapidly following a distance away from the light beam. When the light beam is progressively moved over the object, the object is scanned at a grazing angle of about 3 to 6 degrees in the zone.

Description

Be used to produce the apparatus and method of the image that object surface shape strengthened

Technical field

The present invention relates to the enhancing of surface configuration, more particularly, relate to the method and apparatus that is used to produce the image that the object surfaces shape strengthened.

Background technology

Known have many imaging systems that are used to produce the object surfaces image.The simplest in this system is duplicating machine, and for example, in this duplicating machine, object is illuminated, so that form a latent image on toner cartridge.It also is known being used for the optical scanner of scanning of image input computing machine.

The problem of these systems is that they can not make the abundant surface of profile form good image, are two-dimentional in these system natures, make it not be suitable for the details of reproducing surface configuration inherently.

U.S. Pat-4,920,385 disclose a kind of device that is used to check surface marks, and wherein, the surface is to scan with a mobile light beam, however this device can not provide the resolution of desired surface shape features.

Summary of the invention

The object of the present invention is to provide a kind of system that can strengthen the image of the surface configuration details in the bidimensional image.

According to the present invention, a kind of device that is used to produce the image that the object surfaces shape strengthened is provided, and it comprises the device that is used to produce to the light beam of object illumination, and said light beam has a zone, in this zone, its light intensity promptly descends with the distance of leaving light beam; The device that is used to make said light beam on object, to move progressively; With the device that is used on said object, said object being scanned in said zone with glancing angle when mobile progressively when said light beam.

The Strength Changes that the light belt edge region that intensity variations is similar to a rectangle of meaning " promptly descend " speech is stood although it can otherwise produce, plays a part the enhancing surface disturbance.Typically, in the distance of about 20.3 millimeters (0.8 inches), change twice in this variation on the intensity.In this embodiment, detected surface is with a light illumination, and described light source produces the light belt from the collimation in slit.Along any one edge of this light belt, its light intensity is along with the distance of isolated edge increases and decline apace.

This zone or arrowband are plain edge edge zones of being caused by the diffraction at the edge, slit.Its width is very narrow, and its feature can be modified by the angle that changes lighting source.One in this zone with preferably 3～6 the degree glancing angles focus on lip-deep visual bar, be used to collect by the caused Strength Changes of changes in pitch from the teeth outwards.Can cause variation very big on light intensity in the subtle change on the gradient.

Preferably use a Line scanner to collect light intensity data.The image bar generally only has the width of one or two pixel, is measured as 0.025 millimeter (0.001 inch) cursorily.Visual bar like this be easy to scanner in the plain edge edge zone of using adapt, this zone has the peak width near 2.03 millimeters (0.08 inches).Intensity variations from high to low or from low to high, this depends on where this band is in the zone.When scanner was mobile along the surface, the edge of light also moved thereupon, and the image of enhancing is by formation that each band is combined.

Finally formed and had brighter or darker high-resolution image, appeared out surface tilt suddenly and change.

The present invention also provides a kind of method that produces the image that the object surfaces shape strengthened, it comprises: light beam is moved progressively in object surfaces, said light beam has its intensity with the fast-changing zone of distance, and described object is scanned in described zone with glancing angle when light beam is mobile from the teeth outwards.

Description of drawings

Mode that below will be by embodiment and the present invention will be described in more detail with reference to the accompanying drawings, accompanying drawing has:

Fig. 1 is the skeleton view of the optical devices of simplification;

Fig. 2 is the cut-open view of the optical devices of simplification;

Fig. 3 illustrates the structure of image;

The feature in plain edge edge zone shown in Figure 4;

Fig. 5 is used for illustrating principle of the present invention;

Fig. 6 is the interior light intensity of edge region and the curve map (is unit with 25.4 millimeters (1 inches)) of distance;

Shown in Figure 7 is the Canadian tire ticket that is scanned by prior art;

Shown in Figure 8 be to use be adjusted to corresponding to by dark to bright tilt variation according to device of the present invention the time the Canadian tire ticket that scans;

Shown in Figure 9 being to use is adjusted to corresponding to by the bright Canadian tire ticket according to when device scanning of the present invention to dark tilt variation;

Figure 10 and Figure 11 are respectively the close-up shot of Fig. 8 and Fig. 9.

Embodiment

See figures.1.and.2, this device comprises a light source 1 (as fluorescent tube) and a rectangular aperture 2, and a branch of collimated light is by this slit, and this slit forms a rectangle light belt 3 on the surface 5 that the surface configuration of the object 6 that will be scanned is enriched.Slit 2 is so to arrange, and promptly incident beam incides on the surface with about 80 ° angle A.

The rectangle light belt has a fringe region 3a who becomes the rectangle strip-type, and in this zone, light intensity will descend fast with leaving band.This is significantly zone of a diffraction effect.

Fig. 4 shows the outside drawing of the light belt 3 on body surface; In the main region of light belt 3, light intensity Id is equivalent basically.On the edge, light intensity Id is not because diffraction can drop to zero immediately, although the interior increase with distance d of its edge region 3a descends very apace.According to the present invention, be in this fringe region 3a, the surface to be scanned.

Turn back to Fig. 1 and Fig. 2, the relevant optical devices that in scanner optics device 7 comprises a line camera (Line camera) 8 that contains charge-coupled device (CCD) and is used for edge region 3a the picture that is received scanned.

Catoptron 9 and 10 is so to arrange, so that receive approximately with 3 ° to 6 ° glancing angle B by surface 5 light that reflect, and makes reflected light project scanner optics device 7.

During use, structure as depicted in figs. 1 and 2 moves on object surfaces 5 progressively, thereby surface 5 is scanned line by line by mode shown in Figure 3, so as by the mode of prior art by a series of sweep trace 12 ₁, 12 ₂Form a frame image.

Because the surface is with glancing angle scanning, and light intensity is to change very apace with distance, thereby can strengthen the feature of surface configuration.Fig. 5 shows its reason.Suppose that another plane surface 5 has a bulge 15 that is positioned at fringe region 3a, on this position, light intensity Id will change very apace with distance d.If the optical devices of scanner are observed bulge by direction 11, it will see the surface of bulge 15 at a 15a, and on this position, light intensity has first value Iy.Under the situation that does not have bulge 15, what then should see is on a surface at 15b place, and on this position, the value that light intensity has is Ix.Because supposition (Ix-Iy) is quite big, this is that this demonstrates on image as the rapid variation of light intensity with surface configuration because light intensity is to change apace with distance d.

For the intensity of measuring light fringe region, adopted the IPS system of the National Research Council (NationalResearch Council).Scanner be set at translucent surface above.Then, resembling of being produced carried out digital collection, and analyze with imgae processing software.Produce as shown in Figure 6 intensity and the curve that is calibrated of distance.On the curve shown in the figure, light intensity is by 1022 unit change to 122 units in the distance of 12.7 millimeters (0.5 inches), has in the distance of 20.3 millimeters (0.8 inches) light intensity in the plain edge edge zone of this curve by the variation (per 0.025 millimeter (0.001 inch) 1 unit) of 1000 units of unit to 422.Professional those of skill in the art understood as this, can obtain many different curves, so that adapt to surface configuration.By expansion or squeezed light fringe region, can adjust sensitivity to surface configuration.

Fig. 7 to Figure 11 shows and uses result that the present invention obtained and the comparison that scans with prior art.Should see that the present invention has strengthened surperficial details significantly.

Claims

1. device that is used to produce the image that object surface shape strengthened comprises:

A) be used to produce the light source of the light belt of irradiating object, this light belt defines one because the fringe region of the finite width that diffraction causes, its light intensity distributions is along with descending rapidly with respect to the lateral separation of described light belt, and described finite width is enough to hold a visual bar;

B) be used at the described horizontal device that moves light belt on the described object progressively; With

C) be used on described object, scanning along described visual bar at described fringe region with a glancing angle when mobile progressively the device of described object when described light belt.

2. according to the described device of claim 1, it is characterized in that described light belt projects on the described object surfaces with the direction near the right angle.

3. according to the described device of claim 2, it is characterized in that described light belt has a main central area, wherein light intensity is close to constant, and described fringe region extends in each side of this central area.

4. according to the described device of claim 3, it is characterized in that described scanister is included in the device of the line chart elephant that produces described object in the described fringe region and one and this line chart is resembled the line camera that scans.

5. according to the described device of claim 4, it is characterized in that described fringe region has the width that is no more than about two pixels.

6. according to the described device of claim 4, it is characterized in that described line camera comprises a charge-coupled device (CCD).

7. according to the described device of claim 1, it is characterized in that described light source and described scanister constitute an assembly that can move together on body surface.

8. device that is used to produce the image that object surface shape strengthened comprises:

A) be used to produce the light source of the light belt of irradiating object, this light belt defines the fringe region of a finite width, and its light intensity distributions is along with descending rapidly with respect to the lateral separation of described light belt;

C) be used for when described light belt progressively on described object when mobile with the device of a glancing angle at the described object of described fringe region scanning;

Wherein said glancing angle is 3 to 6 degree.

9. method that is used to produce the image that object surface shape strengthened, may further comprise the steps: on body surface, move a light belt progressively, this light belt has one because the fringe region of the finite width that diffraction causes, its light intensity distributions is along with descending rapidly with respect to the lateral separation of described light belt, and described finite width is enough to hold a visual bar; And when described light beam is mobile on body surface, in described fringe region, scan described object along described visual bar with a glancing angle.

10. in accordance with the method for claim 9, it is characterized in that described glancing angle is 3 to 6 degree.

11. in accordance with the method for claim 10, it is characterized in that described light belt projects on the described object surfaces with the direction near the right angle.