Automated counting and recognition of cells in a peripheral blood smear.

<p>Left panel, original image. Right panel, original image with objects identified as cells shaded in red. Counting done using CellC software.</p

Raytracing simulation result.

<p>Trace of rays through a system composed of an 800 micron aperture, 1 mm ball lens, plastic biconvex lens, and CMOS sensor. Dimensions of plastic lens and sensor correspond to those in the iPhone 2G.</p

Cropped image of a 20 lp/mm Ronchi ruling using the iPhone 4 microscope.

<p>Pincushion distortion and defocus due to field curvature can clearly be seen at the edge of the field-of-view.</p

Transmission spectrum of a human finger.

<p>Upper panel, image of spectrum corresponding to a tungsten bulb. Middle panel, image of a spectrum corresponding to a tungsten bulb with a finger placed over the slit of the spectrometer. Lower panel, spectra of both the tungsten bulb and the transmission spectrum of the finger.</p

White light transmission images.

<p>Images of several commercially prepared microscope slides featuring stained samples. Top row, commercial microscope. Bottom row, cell phone microscope. Left column, pollen grains. Right two columns, plant stems.</p

Micrographs of unstained peripheral blood smears taken with different lenses.

<p>Left panel: image taken with a 1 mm diameter ball lens, inset shows ball lens with penny as a reference. Right panel: image taken with a GRIN lens, inset shows size of GRIN lens with respect to a penny.</p

System diagrams.

<p>Top panel shows the cell phone microscope achieved by adding a ball lens to the cell phone camera system. Lower panel shows the cell phone spectrometer, constructed by adding a grating and collimating tube to the cell phone camera.</p

Fluorescence spectrum of rhodamine 6G.

<p>Upper panel, image of spectrum of Polychrome V light source. Middle panel, image of rhodamine 6G spectrum. Lower panel, a comparison of the excitation and emission spectra of the Polychrome V and rhodamine 6G taken with the cell phone spectrometer and validated with the commercial Ocean Optics spectrometer (oo).</p

Image and spectrum of fluorescent bulb.

<p>Top panel, cropped image recorded by the cell phone spectrometer pointed at a standard fluorescent light fixture. White box indicates area used to determine spectrum in lower panel. Lower panel (top), an image of the spectrum corresponding to area in the white box in the top panel. Lower panel (bottom), a comparison of the spectra of the same fluorescent light fixture taken with both the cell phone spectrometer (blue) and Ocean Optics (oo) spectrometer (red).</p

USAF resolution target.

<p>Image of resolution target taken with the iPhone 2G microscope, showing the ability to clearly resolve group 9 element 2, with slight distortions at the edge of the field.</p