Abstract: Calibration devices for calibrating a camera, systems for computer-aided determination of hair colour information, and methods for calibrating a camera are provided herein. In an embodiment, a method for calibrating a camera includes recording a digital image of a piece of calibration information on a fibre from a plurality of fibres from natural hair or fibres that resemble natural hair by employing a camera. The fibre is identified in the digital image by employing a marker. A plurality of colour values are determined for a plurality of reference colours as the calibration information on the fibre in the digital image, wherein a reference colour value is assigned to each reference colour. The respective determined colour value for the plurality of the determined colour values is assigned to the respectively assigned reference colour value for the plurality of reference colour values.

Abstract: Hair analysing device, hair examination system and method for providing hair condition information. In various embodiments, a hair analysing device is provided. The hair analysing device can have a device body provided with an adhesive layer on at least one side of its surface and configured to be releasably fastened in or on a user's hair by employing the adhesive layer, at least one sensor arranged in or on the device body for detecting at least a sensor value, and an electronic circuit device arranged in or on the device body, wherein the electronic circuit device is coupled to the at least one sensor for receiving the at least one sensor value, and wherein the electronic circuit device is configured to provide the received at least one sensor value to the user.

Abstract: In various embodiments, a hair treatment device is provided. The hair treatment device can have a device body, at least one sensor arranged in or on the device body for detecting a hair condition parameter, and an electronic circuit device arranged in or on the device body. The electronic circuit device can be coupled to the at least one sensor for receiving the detected hair condition parameter, and the electronic circuit device can be configured, based on the received detected hair condition parameter, to control at least one hair treatment parameter and/or to dose at least one hair treatment agent and/or to provide a hair treatment recommendation.

Abstract: Calibration devices for calibrating a camera, systems for computer-aided determination of hair colour information, and methods for calibrating a camera are provided herein. In an embodiment, a method for calibrating a camera includes recording a digital image of a piece of calibration information on a fibre from a plurality of fibres from natural hair or fibres that resemble natural hair by employing a camera. The fibre is identified in the digital image by employing a marker. A plurality of colour values are determined for a plurality of reference colours as the calibration information on the fibre in the digital image, wherein a reference colour value is assigned to each reference colour. The respective determined colour value for the plurality of the determined colour values is assigned to the respectively assigned reference colour value for the plurality of reference colour values.