Lip color measurement: A new hyperspectral imaging device

Abstract

IntroductionThe lips are of significant interest among the facial features for self‐perception and social interactions. Such perceptions could rely in part upon the contrast in color between the lips and the surrounding skin. In contrast to skin color, lip color ethnic diversity measurement provides a challenge and is less documented in the literature, most likely due primarily to challenges in measurement based upon the lip characteristics of size and contour. Accurate measurement and reproduction of lip color are essential to build strong cross‐sectional knowledge about lip color.ObjectiveThis preliminary experiment of a large‐scale project on lip and skin color was designed to assess accuracy in lip color measurement and recommend instruments and protocols for good measurement practice.MethodsThe study involved 19 healthy French Caucasian women. Their inferior and superior natural lip color was measured twice with three devices in order to extract the standard colorimetric parameters of lightness (L*), chroma (C*), and hue (h): the VISIA‐CR® (high‐resolution digital camera, Canfield Scientific Inc.); the spectrophotometer VS3200 (45°:0° spectrophotometer, MetaVue™ VS3200, X‐Rite Inc.); and the SpectraFace® (new hyperspectral imaging system, Newtone Technologies). The intercomparison and color distribution between the different instruments and the measurement repeatability of each one were assessed.ResultsOur results showed a reliable and equivalent repeatability for the three tested instruments. Moreover, the three tools led to the same conclusion regarding lip color heterogeneity (lighter, redder, less yellow and more saturated inferior lip versus superior lip). Agreement between the SpectraFace® and the spectrophotometer measurements was higher, and the SpectraFace® allowed to identify three separated lip color typologies.ConclusionIn conclusion, the combination of imaging technology and hyperspectral measurement makes the SpectraFace® a useful tool to investigate lip color characterization and establish a large‐scale cross‐sectional knowledge study about lip color.

Lip color diversity: An intricate study

“…), and hyperspectral measurement for accurate color data, make the SpectraFace an optimal supplementary tool for skin and lip spectral color characterization. This is complementary to standardized, easy‐to‐use, and deployable photo‐based color measurement devices such as the VISIA‐CR 11 …”

“…This is complementary to standardized, easy‐to‐use, and deployable photo‐based color measurement devices such as the VISIA‐CR. 11 …”

From consistent subjective assessment of skin sensitivity severity to its accurate objective scoring

“…After washing their face with a gentle face cleanser, subjects were allowed to rest for 30 min in a climatized room (21 ± 12°C and 45 ± 5% relative humidity) before taking front and facial side (left and right) images. The resulting images were stored as 2048 × 2048 pixel‐large TIFF files, and the 31‐image series were used to reconstruct color pictures 30 . Various regions of interest (ROIs) were considered: the nasolabial folds, the side of the nose, the cheek, and the entire half‐face (Figure 1).…”

“…The resulting images were stored as 2048 × 2048 pixel‐large TIFF files, and the 31‐image series were used to reconstruct color pictures. 30 Various regions of interest (ROIs) were considered: the nasolabial folds, the side of the nose, the cheek, and the entire half‐face (Figure 1 ). These ROIs were manually drawn on the images from the first acquisition.…”

Image‐based investigation of lip aging features in a large number of Korean women

“…For instance, a method has been reported for extracting lip color using hyperspectral imaging technology. 16 Furthermore, research with large‐scale image data has been actively emerging. In the most recent study, a considerable number of high‐resolution facial selfie images have been collected for the comparison of facial aging patterns between European and Chinese women.…”