• What are Vision Systems?
• Machine Vision Systems Overview
• Image Processing Principles
• Inspection Functions Basics

• Area Judgment by Binarization
• Position Detection
• Dimension Measurement
• Additional Image Functions

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Machine Vision Technology

Additional Image Functions

Partial Image Capturing Function

Traditionally, an entire screen is captured by the CCD and transferred to the controller as shown in the figure below. The CV Series (Keyence) saves transferring time by only capturing necessary pixel images for inspection. In the following example, the processing time was shortened by almost 13 milliseconds by capturing only 90 lines.

Entire image capturing Capturing time: 16.7ms	Partial image capturing (90 lines) Capturing time: 4ms

Camera Shift/Span Adjustment Function

This function not only brightens or darkens the captured image as a whole, but also creates a clearly contrasting image by darkening or brightening images. By adjusting the camera's span and shift, an optimum image of the inspection object can be obtained, allowing accurate inspections.

Camera Sensitivity

Brightness of an image can be adjusted without adjusting the lighting and lenses. (9 stages)

Shift

This brightens or darkens the entire image signal of the CCD. Unlike camera sensitivity, a certain tone can be uniformly blackened or whitened.

Span

This enlarges or evens out the tone changes of the CCD. The difference in brightness is emphasized in order to create a clearer image.

Position adjustment

When the position of the inspection window is fixed on the screen, accurate detection cannot be performed when the target position deviates. This function detects the position in the X- and Y-axis directions and the rotational angle of the target. It then adjusts the window position based on the deviation from the reference position. This allows for stable detection.

The status in the window is detected after adjustment of the reference position. Therefore, erroneous detection will not occur due to target position deviation, as long as the reference image and inspection window are present within the monitor screen.

Illumination adjustment

This function corrects the brightness of the entire screen to prevent erroneous detection, even if the ambient light condition changes due to aging of the illumination device. When a stable area is specified as the "illumination range" on the monitor screen, the entire screen is subjected to illumination adjustment according to the change in the brightness of the specified range.