[Filtering Parameter (Filtering)]

Treat the images that you get from the camera in order to make them easier to be measurement.

There are nine filtering processing methods: [Weak smoothing], [Strong smoothing], [Dilate], [Erosion], [Median], [Extract edges], [Extract horizontal edges], [Extract vertical edges], and [Enhance edges].

Positioning the cursor will allow you to the image that has been pre-processed. Please confirm and select the pre-processed image.

In the "Item tab" area, tap [Filter param].

In the "Display" area, tap [Change display] to switch between two types of camera images.

The displayed contents of the "Image display" area will be switched.

Table: Filtering Parameter (Filtering) - Display
Item	Set Value [Factory defaults]	Description
Display	Through	The latest image is continuously input from the camera and is displayed.
Display	[Freeze]	The image that has been scanned during the immediately preceding measurement is displayed. The image is updated each time a measurement is made.

In the "Target" area, select the target image for filtering.

The displayed contents of the "Image display" area will be switched.

Table: Filtering Parameter (Filtering) - Target
Item	Set Value [Factory defaults]	Description
Target	[Camera image]	Filtering is applied to the images input from the camera that were set up before this unit ([Filtering]) of the scene. Preprocessing disabled.
Target	Prev. unit image	Filtering is applied to the images which have been processed in the [Position Compensation] and [Filtering] units that were set up before this unit ([Filtering]) of the scene.

In the "Filtering order" area, select the sequence in which to apply filtering.

Filtering is performed according to your settings, and the filtered result is displayed in the "Image display" area.

Table: Filtering Parameter (Filtering) - Direction
Item	Set Value [Factory defaults]	Description
Filtering order	[Filtering g BGS ] BGS g Filtering	Select the sequence of background removing/Filtering.

In the "Filtering setting" area, set up "Filtering" and "Filter size".

Filtering Parameter - Filtering setting Area

Table: Filtering Parameter (Filtering) - Filtering Setting
Item	Set Value [Factory defaults]	Description
Filtering	[OFF] Weak smoothing Strong smoothing Dilate Erosion median Extract edges Extract vertical edges Extract horizontal edges Enhance edges	Select available Prev. re-meas. types. For Filtering options and application examples, see Filtering options and examples
Filter size	[3x3] 5x5	Choose to use several surrounding pixels or not. With the larger mask size, the filtering can find more variation from neighboring pixels.

In the "BGS levels" area, specify the [Upper] and [Lower] limit values to suppress unnecessary background noise.
While looking at your image, specify the upper and lower limits for BGS levels.
For setting values, see Background suppression
You can use the slider
Drag the slider up or down.
For fine-tuning, tap the buttons at both ends of the slider.
To input value directly
Tap [...] for "BGS levels" and input a value.
For how to input value, see User's Manual, "Inputting a Value"
For the subsequent operations, see Set up "Filtering".

Filtering options and examples

Treat the images that you get from the camera in order to make them easier to be measurement.

Table: Types of Filtering (Filtering)
Types of Filtering	The problems to be treated	Filtering Description	Example
Weak smoothing Strong smoothing	Small flecks on the measurement object	This filtering makes the flecks less visible.	Stable Searching
Dilate	Dark noise exists	This filtering removes noise by enlarging brighter area.	Noise removing of measurement objects
Erosion	Brighter noise exists	This filtering removes brighter noise by shrinking brighter area.	Noise removing of measurement objects
Median	Small flecks on the measurement object	This filtering keep the profile and weaken flecks.	Edge Position (no accuracy is reduced)
Extract edges	Due to a comparatively lower image contrast, defects are difficult to be found	This filtering measures boundary line of the image (light and shade).	Defects measuring
Extract vertical edges	Due to a comparatively lower image contrast, defects are difficult to be found	This filtering measures vertical boundary line of the image (light and shade).
Extract horizontal edges	Due to a comparatively lower image contrast, defects are difficult to be found	This filtering measures horizontal boundary line of the image(light and shade).
Enhance edges	The measurement object is blurry (due to changes such as lighting fluctuation).	This filtering makes boundary lines between the lights and darks of the image understandable.	Edge positioning

Notes about Filtering Setting

If filtering is applied to the image, the area around the image frame will become unstable. When the [Filtering] processing item has been set up in the scene, ensure that the measurement range to be set up in other processing items should not include the area around the image frame.

The width to be measurement will depend on the mask size.

Filtersize: 5 x 5
Set up to make 2-pixel width of the image frame not to be included in the measurement range.
Filter size: 3 x 3
Set up to make 1-pixel width of the image frame not to be included in the measurement range.

When you use a partial-scan camera to delimit the image reading range

Make it not include the area around the image frame by proper set up.

The width that will not included in the image reading range is the same as the above (in the following figure. Filter size:5 x 5). Background

Illustration of Notes about Filtering Setting

Background suppression

The parts below [Lower] and above [Upper] will be set to the lower and upper limits of the brightness, respectively.

Only images with a density ranging 100 to 220 could become measurement objects.

For the subsequent operations, see

Set up "Filtering".