| abstract |
The present invention relates to a method of estimating chlorophyll content of a leaf (12), which method comprises: providing a device (10), wherein the device comprises: a mobile computing device (14) comprising a digital camera (16); and a peripheral (18) removably attached to the mobile computing device, the peripheral comprising a light source (20) aligned with the digital camera when the peripheral is removably attached to the mobile computing device such that the light source (20) may illuminate a lens of the digital camera (16), wherein the peripheral provides for a space (19) between the light source (20) and the digital camera (16); capturing by the digital camera (16) a first image (34a) of the light source turned on without the leaf (12) interposed between the digital camera and the light source; retrieving exposure data of the first image; capturing by the digital camera a second image (34b) with the leaf interposed between the digital camera and the turned on light source; retrieving exposure data of the second image; and using a processor, estimating the chlorophyll content of the leaf based on the retrieved exposure data of the first and second images, wherein the exposure data include at least one of exposure time, F-number, and ISO value. |