Rhopoint TAMS™ (Total Appearance Measurement System), an innovative appearance meter, with comprehensive parameters that mimic human perception of surface appearance quality.

Rhopoint TAMS™

In the automotive industry, color is not the only important parameter to describe a high-quality paint finish. Brilliance (gloss) and smoothness, often referred to as DOI (Distinctness of Image), are equally important. To achieve maximum visual impact, overall surface finish must display both high quality and harmony.

Rhopoint TAMS™, inspired by a four-year collaboration between Rhopoint, Volkswagen AG and AUDI AG, is a new way of quantifying appearance quality. Equipped with new parameters, this innovative new technology mimic human perception of surface appearance quality, providing easy and fast communication of visual appearance information.

Rhopoint TAMS™ has the ability to capture surface data ranging from mid gloss to high gloss, offering the possibility of quantifying all surfaces such as E-Coat, filler, base coat and top coat aluminum and steel, throughout the automotive manufacturing process.

Raw Material Measurement

Data like 3D topographical maps helps better understand how each painting process fills, smooths, and masks the roughness from the base material like aluminum and steel. Laboratory devices which produce 3D topographical maps are often costly and complex to use. Rhopoint TAMS™, with its free Optimap Reader image analysis software and Phase Measurement Deflectometry (PMD) measurement technologies, provides fast and high-resolution 3D altitude maps of raw materials and surfaces in the painting process that comply with ISO 16610. The measurements like areal topographic information (Sa) and optical Ra are also taken as per DIN EN ISO 25178 and DIN EN ISO 4287.

E-Coat Measurement

E-coating, also called Electrophoretic Painting, Electrocoating, Electropainting, has a huge impact on the final quality. Rhopoint TAMS™ and its advanced quality parameters like topographic roughness indices (Sa) provide a complete overview of the painting process, offering easy documentation, reporting, and better control of E-coat. Besides analyzing the topographic indices, this innovative appearance measurement instrument also comes with advanced quality indices to help judge the E-coat overall quality.

C-Coat Measurement


Related to the color of the surface where white and metallic surfaces exhibit low contrast while black surface has high contrast. This parameter quantifies the visual impact of both haze effects and orange peel which are visible on high contrast colors.


Sharpness measures the accuracy of the reflected images. Sharpness defines how well a surface reflects fine details at close distances (<0.5m). At showroom viewing distance (1.5m), it quantifies clarity and haze.


Waviness of a surface is vital in establishing appearance quality as it measures the visible impact of surfaces waves to observer at showroom distance (1.5m).


Dimension indicates the dominant structure size, an important parameter in determining the harmony between adjacent parts and panels, viewed at showroom distance (1.5m). Values are usually between 1–6mm.


Calculated using Sharpness and Waviness parameters, the Quality index rates the total appearance quality of a surface. Smooth finish with perfect image forming characteristics is indicated by 100%


Calculated using Waviness and Dimension parameters, the Harmony index determines the acceptability of adjacent car parts. A >1.0 value would indicate that parts are dissimilar when viewed together and will reduce the overall visual quality.

Rhopoint TAMS™

  • Dual focus camera to fully captures all surface appearance data
  • Powerful processor for fast operation
  • Easy-to-navigate touch-screen menu
  • Push and start pressure sensitive auto-measurement system
  • Rechargeable and removable lithium polymer batteries
  • RFID available for enhanced process integration

Rhopoint TAMS™


Menu Interface 5 Capacitive Sense buttons
Measurement Operation Tactile button, capacitive sensor, push&start auto measurement system
Measurement Time 5 (Typical) Second: Image Capture
2 (Typical) Second: Processing
Color Screen Full colour IPS screen
Power Rechargeable Lithium Ion batteries
Battery performance Approx. 1500(Typical) times
Charging Time Approx. 5.5 hours
Memory 32 GB internal
32 GB SD card
Data Transfer SD Card
Optical System Variable Focus Machine Vision
Spatial Resolution (surface) 37 μm/pixel
Field of View (surface) 27 x 16mm
Object Curvature radius > 400mm
Object Min. Size 40 × 80mm*
Processor Specification ARM Cortex
Production Integration RFID TAG Reader (optional)
Dimensions / Weight 172 x 136 x 56 mm/approx. 1.0kg(include batteries)
Operating Temperature/Humidity
temperature:15~40℃, relative humidity:85% or less
Additional Sensors Accelerometer, Orientation,
4 x Pressure (measurement)
Construction Aluminium instrument case

*contact us when measuring small object.

WS-Bands (C-/E-Coat)
Sa_A Sa_B Sa_C Sa_D
Bandpass Filter [mm] 0.1 – 0.3 0.3 – 1.0 1.0 – 3.0 3.0 – 10.0
Resolution (on display) 0.1
Repeatability [SD] 0.1
Reproducibility [SD, max] 0.3
Sa_E Sa_SW Sa_LW
Bandpass Filter [mm] 10.0 – 13.5 0.3 – 1.2 1.2 – 12.0
Resolution (on display) 0.1
Repeatability [SD] 0.1
Reproducibility [SD, max] 0.3


Contrast Sharpness
Index [units] C [%] S [%]
Minimum 0.0 0.0
Maximum 100.0 100.0
Resolution (on display) 0.1 0.1
Repeatability [SD] 0.3 0.3
Reproducibility [SD, max] 0.5 1.0
Measurement Technique Optical Transfer Function
Waviness Dimension
Index [units] W [„W“ units] D [mm]
Minimum 0.0 0.5
Maximum 30.0 6.8
Resolution (on display) 0.1 0.1
Repeatability [SD] 0.3 0.3
Reproducibility [SD, max] 0.5 0.5
Measurement Technique Reflected Image Line Deformation Analysis Phase Measurement Deflectometry
Correlation AUDI AG MDS Perception analysis
Quality Harmony
Index [units] Q [%] H [„H“ units]
Minimum 0.0 0.5
Maximum 100.0 8.9
Resolution (on display) 0.1 0.1
Repeatability [SD] 0.5 0.2
Reproducibility [SD, max] 2.0 0.3
Algorithm Calculated using Sharpness, Waviness, Contrast Calculated using Waviness, Dimension
Correlation Volkswagen AG Qualify Perception Studies AUDI AG MDS Perception analysis


E-Coat / R-Mat (O-Rough)
Arithmetical mean height of surface area Roughness Average in X-direction
Index [units] Sa [µm] RaX [µm]
Minimum 0.0 0.0
Maximum 20 20
Resolution  0.05 0.05
Repeatability [SD] 0.1 0.1
Reproducibility [SD, max] 0.3 0.3
Measurement Technique Phase Measurement Deflectometry
Roughness Average in Y-direction Mean width of profile elements
Index [units] RaY [µm] RsM [mm]
Minimum 0.0 0.3
Maximum 20.0 9.0
Resolution (on display) 0.05 0.05
Repeatability [SD] 0.1 0.1
Reproducibility [SD, max] 0.3 0.3
Measurement Technique Phase Measurement Deflectometry


Rhopoint TAMS™

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Rhopoint TAMS™

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