檢測的新演算法 AOI應用面 2D及3D量測 – HALCON 12-新亞洲儀器

1. ©2003-2014MVTecSoftwareGmbH.
1
Images/Graphics:©2014MVTecSoftwareGmbHandLicensers.Allrightsreserved.
MVTec Software GmbH is a leading international manufacturer of software for
machine vision used in all demanding areas of imaging: semi-conductor industry,
web inspection, quality control and inspection applications in general, medicine,
surveillance etc.
MVTec's innovative work is driven by a commitment to be the number one
supplier for sophisticated technologies in machine vision. MVTec is engaged in
sponsoring various activities in universities, thus participating in the challenging
process of understanding how machines can be taught to see.
HALCON is the comprehensive standard software for machine vision with an
integrated development environment (IDE) that is used worldwide. It leads to
cost savings and improved time to market: HALCON's flexible architecture
facilitates rapid development of machine vision, medical imaging, and image
analysis applications. HALCON provides outstanding performance and a
comprehensive support of multi-core platforms, MMX and SSE2, as well as GPU
acceleration. It serves all industries with a library of more than 1800 operators
for blob analysis, morphology, matching, measuring, identification, and 3D
vision, to name just a few. HALCON secures your investment by supporting a
wide range of operating systems and providing interfaces to hundreds of
industrial cameras and frame grabbers, also for standards like GenICam, GigE
Vision, and IIDC 1394.

2. ©2003-2014MVTecSoftwareGmbH.
2
Images/Graphics:©2014MVTecSoftwareGmbHandLicensers.Allrightsreserved.
HALCON 12 will be released on November 15, 2014. It offers numerous new
features useful for many industries.
Today, we would like to briefly introduce two new features that are particularly
helpful for customers in the AOI industry.

3. ©2003-2014MVTecSoftwareGmbH.
3
Images/Graphics:©2014MVTecSoftwareGmbHandLicensers.Allrightsreserved.
In a normal setup, the image plane is orthogonal to the optical axis of the lens. In
case of strong magnification, that leads to the sometimes undesired effect, that
objects that are viewed from an angle are partly out of focus, because of the
limited depth of field.

4. ©2003-2014MVTecSoftwareGmbH.
4
Images/Graphics:©2014MVTecSoftwareGmbHandLicensers.Allrightsreserved.
To avoid this situation the lens or the image plane may be tilted to meet the
Scheimpflug condition: The image plane, the lens plane, and the focus plane
intersect in a single line, the Scheimpflug line. As a consequence, it is now
possible to take images of objects that are completely in focus, even if they are
not parallel to the camera.
Tip:
Fix the lens, then tilt the camera to keep the field of view constant.

5. ©2003-2014MVTecSoftwareGmbH.
5
Images/Graphics:©2014MVTecSoftwareGmbHandLicensers.Allrightsreserved.
Image of a caliper taken from an angle in two different setups: Left: Without tilt
lens, parts of the object are out of focus. Right: With tilt lens, the whole object is
in focus.

6. ©2003-2014MVTecSoftwareGmbH.
6
Images/Graphics:©2014MVTecSoftwareGmbHandLicensers.Allrightsreserved.
Stereo Vision
In most stereo setups, the used cameras observe the scene at different angles.
That means, when using normal lenses, their focal planes are also not parallel,
i.e., each camera covers a different volume that is in focus. With smaller depth-
of-field or larger angle between the cameras, the volume that is in focus for all
cameras gets smaller, what might lead to serious problems for the
reconstruction. Tilt lenses can be used to align the focus planes of the different
cameras.

7. ©2003-2014MVTecSoftwareGmbH.
7
Images/Graphics:©2014MVTecSoftwareGmbHandLicensers.Allrightsreserved.
Stereo Vision
In most stereo setups, the used cameras observe the scene at different angles.
That means, when using normal lenses, their focal planes are also not parallel,
i.e., each camera covers a different volume that is in focus. With smaller depth-
of-field or larger angle between the cameras, the volume that is in focus for all
cameras gets smaller, what might lead to serious problems for the
reconstruction. Tilt lenses can be used to align the focus planes of the different
cameras.

8. ©2003-2014MVTecSoftwareGmbH.
8
Images/Graphics:©2014MVTecSoftwareGmbHandLicensers.Allrightsreserved.

9. ©2003-2014MVTecSoftwareGmbH.
9
Images/Graphics:©2014MVTecSoftwareGmbHandLicensers.Allrightsreserved.
HALCON has been extended with an operator distance_contours_xld that
computes the pointwise distance of contours. In contrast to distance_cc,
distance_contours_xld computes the minimal distance for each point of the
contour. The resulting distances are returned as attributes of the
output contour. To facilitate further processing, HALCON has also been
extended with an operator segment_contour_attrib_xld, which segments
XLD contours based on their attributes.
The new HDevelop example programs
- hdevelop/Applications/Measuring-2D/inspect_frame_width.hdev
- hdevelop/Tools/Geometry/apply_distance_transform.hdev
show how to use the new functionality to calculate the pointwise distance
between contours. They use the new images phone_camera_frame_01
and phone_camera_frame_02 from the subdirectory images/plastic_parts.

10. ©2003-2014MVTecSoftwareGmbH.
10
Images/Graphics:©2014MVTecSoftwareGmbHandLicensers.Allrightsreserved.
In many inspection tasks lines or edges need to be evaluated on a subpixel
precise level. distance_contour_xld makes these applications much easier.
Instead of using high-resolution cameras or complex algorithms, computing the
distance transformation of contours is usually faster and much easier to set up.
If the shape of the structure to be inspected changes, for instance because there
is a modification to the product, solutions based on distance_contour_xld can be
retrained by the end customer with little to no programming of the machine
maker required.

11. ©2003-2014MVTecSoftwareGmbH.
11
Images/Graphics:©2014MVTecSoftwareGmbHandLicensers.Allrightsreserved.
The operator distance_contours_xld calculates for each point in ContourFrom
the minimal distance to the contours in ContourTo. The operator returns the
contour ContourOut which consists of ContourFrom containing the computed
distances in the attribute 'distance'. The distances can be accessed by querying
the attribute 'distance' with the operator get_contour_attrib_xld.

12. ©2003-2014MVTecSoftwareGmbH.
12
Images/Graphics:©2014MVTecSoftwareGmbHandLicensers.Allrightsreserved.
The parameter Mode determines which distances are calculated for each point
in ContourFrom: 'point_to_point' calculates the minimal distance to the base
points of ContourTo. In contrast,'point_to_segment' calculates the minimum
distance to the contour segments in ContourTo.
'point_to_point' is faster, while 'point_to_segment' is more accurate.

13. ©2003-2014MVTecSoftwareGmbH.
13
Images/Graphics:©2014MVTecSoftwareGmbHandLicensers.Allrightsreserved.
HALCON 12 offers many more new features. For example, OCR has been
improved dramatically for better ease of use and higher reliability. HALCON 12
also offers direct support for Digital I/O cards and for communication with PLCs
using OPC UA. It offers a lot of new functionality to make development of
solutions easier and more efficient. Finally, HALCON 12 is also significantly
faster than its predecessor.

14. ©2003-2014MVTecSoftwareGmbH.
14
Images/Graphics:©2014MVTecSoftwareGmbHandLicensers.Allrightsreserved.
Join us to find out more, HALCON 12 World Tour will stop in Taiwan soon.