Surface color and liquid contact angle imaging

A method of imaging a side view of a object on a surface, comprising:

• (a) providing a housing;
• a side-mirror;
• a light source;
• and a camera, wherein the housing has an opening to sit on a surface;
• the housing connects and houses the side-mirror, the light source, and the camera, in such way that for an object on the surface, the sideview of an object is imaged by the camera through the side mirror, and the side-mirror is on an angle off of the perpendicular direction of the surface;
• (b) placing the object on the surface;
• and
• (c) illuminating the object using the light source, and imaging, using the camera, the side view of the object.

A device for imaging color of an object, comprising:

• a housing, a camera, a light source, and a color calibration card;
• wherein:
• the color calibration card has a color pattern that is predetermined and known;
• the housing has an opening for viewing an object;
• and
• the housing connects and houses the light source, the camera, and the calibration card in such way that the camera views the calibration card and at least a part of the object in the same field of view.

A method of imaging color of a surface, comprising:

• (a) providing a housing, a camera, a light source, and a color calibration card;
• wherein the color calibration card has a color pattern that is predetermined and known;
• the housing has an opening for viewing the surface;
• and the housing connects and houses the light source, the camera, and the calibration card in such way that the camera views the calibration card and at least a part of the surface in the same field of view;
• (b) illuminating, using the light source and imaging, using the camera, the at least part of the surface and the calibration card;
• and
• (c) obtaining the color of the at least part of the surface by analyzing and comparing the image of the at least part of the surface with the image of the calibration card.

A device for illuminating and imaging an object, comprising:

• a smartphone with a light source and a camera;
• an imaging lens;
• a first mirror;
• a second mirror;
• a flexible light guide;
• housing that (i) houses the lens, the first mirror, and the second mirror, and (ii) has a slot for holding an assay device, and
• wherein:
• the light guide receives light from a light source of a smartphone and redirects the received light towards the second mirror;
• the second mirror reflects light received from the light guide and directs the light towards the first mirror;
• the first mirror reflects light received from the second mirror and directs the light towards the lens;
• the lens collects the light and sends into the camera;
• and
• the slot places a portion of the assay device in the light path between the first mirror and the lens, wherein the light transmits through the assay device.

A method of illuminating and imaging an assay device comprising:

• (a) providing a smartphone with a light source;
• (b) providing a flexible light guide, wherein the light guide has the first end next to the light source and guides the light towards a second end of the light guide;
• (c) directing the light emitted by the second end of the light guide towards a second mirror;
• (d) reflecting using the second mirror, the light towards a first mirror;
• (e) reflecting, using the first mirror, the light toward an assay device;
• and
• (f) collecting using a lens, light transmitted through the assay device and directing the transmitted light towards the camera in a smartphone.