Uniform Intensity Lighting System
Publication Date: 2014-Dec-02
The IP.com Prior Art Database
Page 01 of 2
Lighting and Data Acquisition for Real‐Time Color Harmony Evaluation of Vehicles
The body of automobiles and light trucks are typically painted by the automotive original equipment manufacturer (OEM). However, the plastic hang‐on parts such as the front and rear fascia, mirror caps, and door handles are often painted by a third party supplier with different paint materials and application conditions. Typically, the OEM‐painted body and the supplier‐ painted parts should be painted the exact same color to achieve good color match between the body and hang‐on parts. This is particularly important for parts adjacent one another, such as the fascia and fender. Small mismatches in color are readily perceivable by customers and should be avoided.
Below, a method is described to simultaneously uniformly illuminate a vehicle moving on the assembly line and capture a digital image of the junction points between a part painted by the OEM and a part painted by a supplier. The digital image can then be processed by computer algorithms in a specific manner to assess the color harmony between the two areas.
The most economical method to acquire color information from an assembled automobile is to capture a digital image of the vehicle while it is in motion on the assembly line. This method is superior to alternative methods because 1) it does not require the vehicle to be stopped, and 2) it does not require the vehicle to be touched. However, these limitations require that a relatively bright light source be used to illuminate the areas of the vehicle to be photographed to avoid blurring of the vehicle. In addition, most automotive colors are gonioapparent, which means that their perceived color depends strongly on the direction of both illumination and observation. The uniform illumination of a sufficiently large area near the fascia‐fender match point is critical to the measurement of the relative color on...