IRVeinViewer — free, simple version of SpectraCam

IRVeinViewer allows you to improve the visibility of the veins*, using better penetration of infrared rays through the skin and hemoglobin contrast (Hb and HbO2) in the near infrared range with surrounding tissues. In addition, since melanin (skin pigment) absorption is maximal in the shortwave part of the spectrum, and in the IR region it drops significantly, skin color has little effect on the observability of the veins.

IRVeinViewer is extremely easy to use - launch the app and point your smartphone at the search area. Everything else happens automatically - turning on the backlight, highlighting the IR image and adjusting the optimal contrast.

Tap an image on the screen to adjust the focus.

Freeze a image with button Freeze/Run.

Using the IR source / 2D Filter button, select to view the original infrared image or processed by the filter.

Using the Thin / Thin Max / Wide / Wide Max button, apply a 2D filter to increase the contrast of thin / wide veins to the Freeze Frame.

*: It works poorly with cameras with aggressive denoiser.

The IRVeinViewer does not work at all if the veins are hidden by a layer of subcutaneous fat. Usualy, for most people up to 20 years it is insignificant, and the veins are clearly visible in the infrared range on the arms, legs, head. On the neck arteries can also be seen. At age after 40 years, visibility is keep on the biceps, fist and forearm. Fist veins are visible in almost all.

In addition, the hemoglobin level matters, the higher it is, the more contrast the image. Its level depends on gender (higher for men), fitness (endurance sports), degree of fatigue, smoking. An abstract ideal variant is a man of 20-30 years old, who was engaged in cross-country skiing, with a small smoking history.

IRVeinViewer 可以使红外线更好地穿透皮肤，并在周围组织的近红外范围内更好地穿透血红蛋白和血红蛋白（Hb和HbO2），从而改善静脉的可见性*。此外，由于黑色素（皮肤色素）在光谱的短波部分吸收最大，而在IR区域则明显下降，因此皮肤颜色对静脉的可观察性影响很小。

IRVeinViewer 非常易于使用-启动应用程序，然后将智能手机指向搜索区域。其他所有事情都会自动发生-开启背光灯，突出显示红外图像并调整最佳对比度。

点按屏幕上的图像以调整焦点。

使用按钮冻结/运行冻结图像。

使用红外源/二维过滤器按钮，选择以查看原始红外图像或由过滤器处理的红外图像。

使用 Thin / Thin Max / Wide / WideMax 按钮，应用2D滤镜以增加Freeze框架的细/宽脉动的对比度。

*：它与带有主动降噪功能的相机一起使用时效果不佳。

如果静脉被皮下脂肪层掩盖，IRVeinViewer根本不起作用。通常，对于20岁以下的大多数人来说，这是微不足道的，并且在手臂，腿部，头部的红外线范围内清晰可见静脉。在脖子上的动脉也可以看到。在40岁以后的年龄，二头肌，拳头和前臂始终保持可见性。几乎所有部位都可见拳头静脉。

另外，血红蛋白水平很重要，它越高，图像的对比度越大。其水平取决于性别（男性较高），健身（耐力运动），疲劳程度，吸烟。一个抽象的理想变体是一个20-30岁的男子，他从事越野滑雪，并且吸烟史很少。