As a professional device focusing on the accurate detection of the scalp and skin, the M13X relies heavily on the performance of the camera module to realize its core functions. For such "medical-grade beauty detection equipment", the requirements for camera modules are far higher than those for ordinary consumer-grade imaging devices. To meet the core demands of "detection accuracy, scenario adaptation, and stability and reliability", the camera modules must comply with multi-dimensional technical standards. The specific requirements are as follows:
The core demand of such devices is to "capture microscopic details", so the camera module must have high-resolution imaging capabilities. Referring to the 10-megapixel HD probe of the M13X, the module must meet at least the standard of "10-megapixel or higher + HD output". On one hand, the image sensor should adopt a chip with high pixel density to ensure that it can capture micron-level details such as hair follicle openings (with a diameter of approximately 0.1-0.3 mm) and hair scales, avoiding detail blurriness caused by insufficient pixels (e.g., inability to distinguish between hair follicle blockages and normal cuticles). On the other hand, the lens group must have low distortion and high light transmittance characteristics—low distortion can prevent stretching and deformation at the edges of the image (such as distortion of the scalp contour), while high light transmittance can reduce light loss and ensure clear details even under low-light conditions (such as local supplementary lighting in the detection area), providing a precise image basis for subsequent problem judgment.
To meet the functional requirement of "dual-probe 200x/50x switching", the module must have high-precision magnification control capabilities. First, the optical structure design should support stable switching between "low-magnification macro imaging" and "high-magnification microscopic imaging"—for example, through the cooperation of multiple sets of zoom lenses and stepping motors, rapid focusing during magnification switching can be achieved (the switching response time should be controlled within 1 second), avoiding delays in detection efficiency caused by focusing lag. Second, under high magnification (e.g., 200x), "high resolution" must be ensured. The module should optimize the matching between the lens focal length and the sensor to ensure that the internal structure of the hair follicle can still be clearly displayed under 200x magnification, without defocusing or ghosting. In addition, the stability of the image must be maintained during magnification switching to avoid image shift caused by the shaking of mechanical structures, ensuring that the detection areas under different magnifications can be accurately aligned (e.g., the "oil area" marked under 50x can still be focused on the same position after switching to 200x).
"Four-spectrum detection" is the core function of such devices to achieve "in-depth analysis", so the module must have strong multi-spectrum adaptability. First, the sensor should support the sensing of light of multiple wavelengths, capable of accurately capturing signals in different wavebands such as visible light (400-700 nm), ultraviolet light (300-400 nm), and near-infrared light (700-1100 nm). Moreover, the sensitivity of each waveband should be balanced to avoid over-dark or over-bright imaging in a certain spectral channel. Second, the module should be equipped with dedicated light filter components that can accurately separate different spectra (e.g., filtering out stray light through narrow-band filters) to prevent spectral crosstalk (e.g., ultraviolet light signals mixing into visible light images) and ensure the independence and accuracy of each spectral image. Third, the data processing capability should match the multi-spectrum requirements. The module should be able to quickly and synchronously process multi-spectral image data to avoid a decline in detection efficiency due to data processing delays. At the same time, it must ensure the color reproduction of each spectral image (e.g., the oil area under ultraviolet light should present a stable identification color), facilitating beauticians to conduct intuitive comparative analysis.
Since the device is applied in commercial scenarios such as beauty salons, the module must have excellent environmental adaptability. First, anti-ambient light interference capability—it should support functions such as automatic white balance and backlight compensation, and can automatically adjust imaging parameters according to different indoor lighting conditions (e.g., warm light, cool light, mixed light) to ensure consistent image color and brightness of the same detection object under different lighting conditions, avoiding "oil misjudgment" and "moisture misreading" caused by ambient light. Second, physical adaptability—it should be compatible with the ABS/PC material shell of the device. The packaging structure of the module should have a certain degree of dust-proof and anti-minor collision performance (e.g., a hardened coating on the lens surface to prevent scratches). At the same time, the heat dissipation environment inside the device should be considered, and the operating temperature range of the module should cover 20-35°C (conventional indoor temperature) to avoid a decline in imaging performance due to excessive temperature. Third, long-term stability—it should meet the high-frequency use requirement of "more than 10 detections per day on average". The mechanical structures (such as focusing motors) and electronic components (such as sensors) of the module should have long-service-life characteristics to ensure no degradation in imaging accuracy or magnification switching failures within 1-2 years of continuous use.
Such devices are usually equipped with large-sized HD displays (e.g., the 11-inch HD display of the M13X), so the module must have efficient data transmission and synchronization capabilities. On one hand, the module should be equipped with a high-speed data interface (e.g., USB 3.0 or higher) to ensure that 10-megapixel images can be quickly transmitted to the display. The transmission delay should be controlled within 0.5 seconds to avoid beauticians waiting due to data lag. On the other hand, the data protocol should be compatible with the display to ensure that the imaging data can be directly converted into the resolution and color format supported by the display, avoiding image stretching or color distortion (e.g., no edge cropping when the detection image is displayed on the 11-inch screen) and realizing seamless synchronization between "imaging and display" to ensure the smoothness of the detection process.