Measurements that closely correlate to human perception are easier to understand
For maximum impact, an automotive paint finish must instantly produce an appealing visual sensation for the customer. This can only be achieved if the overall surface finish displays both high QUALITY and HARMONY.
Improved correlation and easy communication gives Rhopoint TAMS™ a major advantage over existing methods that produce complex results relying on the user to interpret the values into a real-life visual experience.
Rhopoint TAMS™ technology provides opportunities to IMPROVE SURFACE FINISH, establish improved QUALITY CRITERIA and REMOVE SUBJECTIVITY IN VISUAL ASSESSMENT.
One single value rates the total appearance quality of a surface. 100% indicates a smooth finish with perfect image forming characteristics. Rhopoint TAMS™ quality is calculated using waviness and sharpness values predicting the visual rating of the customer.
Based on extensive human perception research by AUDI AG, this value indicates the acceptability of adjacent car parts. It is calculated using Waviness and Dimension parameters. A value of >1.0 indicates parts are not similar and if viewed together will detract from overall visual quality.
Data from the Rhopoint TAMS™ vision system is processed using perception algorithms derived from extensive human perception studies.
Contrast is related to the colour of the surface; white and metallic surfaces have low contrast, a deep black measures 100%. Contrast quantifies the visual impact of orange peel and haze effects both being more visible on high contrast dark colours.
Reflection in a White surface:
Reflection in a Black surface:
Sharpness quantifies the accuracy of images reflected in the surface, 100% indicates a perfect reflection.
At close distances (<0.5m) SHARPNESS measures how well surface reflects fine details. At showroom viewing distance (1.5m) SHARPNESS quantifies haze and clarity.
Close Distance view of an unsharp surface:
Close Distance view of a sharp surface:
Showroom Distance view of an unsharp surface:
Showroom Distance view of a sharp surface:
Correlated to human perception, waviness quantifies the visible impact of surface waves to an observer at showroom distance (1.5m). The waviness of a surface is critical for determining appearance quality. Low waviness surfaces tend to be preferred by the viewer.
Indicates the dominant structure size perceived at showroom viewing distance. Typical values are between 1–6mm, the dominant structure size is important in determining the harmony between adjacent panels/parts.
Small structure dominant surface:
Large structure dominant surface:
Rhopoint TAMS™ VISION
To achieve close correlation with human perception Rhopoint TAMS™ emulates the human evaluation of a reflective surface, changing its imaging system focus from surface to reflected image.
The image transfer qualities of the surface are measured and used to calculate sharpness and contrast.
Waviness is calculated by quantifying distortion in a reflected image.
Surface topography is analysed to identify the Dominant structure.
Rhopoint TAMS™ is able to capture surface data for mid gloss and high gloss surfaces offering the possibility of measuring all surfaces throughout the automotive manufacturing process - steel and aluminium, E-Coat as well as filler, base coat and top coat.
Konica Minolta Sensing Europe B.V. is an authorized Distributor of Rhopoint Instruments Ltd.