Posts tagged ‘webcam’

Measurement of microscope capabilities.

Mar 27 10

by mat

As requested (by uplink) here are some images and calculations of the microscopes maximum zoom.

The images are taken with the edge of the camera case pressed right up against the ruler. You could probably remove casing to increase zoom slightly, or create a slot to slide a microscope slide into it. The camera has two focuses the first:

Usb digital microscope's first zoom level of a ruler (markings at 0.5mm)

And the second (maximum zoom):

Usb digital microscope's full zoom level of a ruler (markings at 0.5mm)

I am using my laptop screen as a typical screen and viewing the image at 100%. Poor mans calculations give you the following for the first focus and second focus:

1mm displayed over 40mm: zoom ~ 40x
1mm displayed over 150mm: zoom ~ 150x

(Note: Measuring magnification level is rubbish as it depends on screen the image is viewed on, so viewing it on a projector would make the statistics seem more impressive.)

The minimum zoom is less than this as we can move the camera further from the object:

Usb digital microscope's minimum zoom level of a ruler (markings at 0.5mm)

Which is about 15x zoom. The microscope box states the zoom is between 10x and 200x, which from these tests seems a little over-exaggerated but not by much.

More microscope images (21)

Mar 20 10

by mat

So I got a little carried away and started to take images of everything with my microscope:

Electronics

Magnified image of an intergrated circuit chip

Magnified image of an surface mount LED

Magnified image of an another integrated circuit chip

Magnified image of yet an another integrated circuit chip

Magnified image of a crocodile clip

Magnified image of a surface mounted resistors

Magnified image of a digital printed circuit board

Magnified image of a digital camera

Magnified image of a camera focussed on the glass

Magnified image of a camera

Magnified image of a headphone

Magnified image of a mobile phone speaker

Magnifieid image of a DVD

Materials

Magnified image of a dry sponge (with some solder burns)

Magnified image of a wet sponge (with some solder burns)

Magnified image of a caramel shortbread biscuit

Magnified image of a flapjack

Magnified image of demin

Magnified image of paper

Eyes

Magnified image of the queen's eye from a £10 note

Magnified image of an eye

Note the reflection in the image of my eye, if you zoom in and enhance you may be able to read what is on my screen which will then possibly lead to the solving of a murder.

DigiMicro 200X Zooming USB Digital Microscope in ubuntu (linux)

Mar 20 10

by mat

I’ve wanted a USB microscope for a long time, and I have finally purchased a DigiMicro 200X Zooming USB Digital Microscope from dealextreme (product link) It only cost $40.23 USD (about £27.34 GBP) which I think is quite reasnoble for the fun and cool photos I’m getting out of it.

DigiMicro 200X Zooming USB Digital Microscope

Quick Review
Advantages

Very Cheap
Easy to setup (plug and play)
Can take some awesome photos, see below
Three illumination settings (full on, half on, off) on top of software compensation

Disadvantages

Controls (lights, zoom/focus and snapshot) are located on the body which make using them difficult if you are trying not to move your sample
The stand is not very stable, tightening it to maximum holds it steady at certain angles for short periods of time
Takes ~ 2 weeks to arrive from dealextreme as they are based in hong kong

Setup

The beauty of this webcam is that it requires no installation with ubuntu 9.10 you simply need to run the software and the camera works! woo! The output of `lsusb` shows the device as:

Bus 001 Device 006: ID 0c45:62e0 Microdia MSI Starcam Racer

and `dmesg` shows the following:

[22844.064666] uvcvideo: Found UVC 1.00 device USB 2.0 Camera (0c45:62e0)
[22844.080844] input: USB 2.0 Camera as /devices/pci0000:00/0000:00:0b.1/usb1/1-6/1-6:1.0/input/input9

Software
Most video programs will pick up the device, I am opting to use a program called cheese which is awesome not only because of the name but also because of its simplicity.

sudo apt-get install cheese

Screenshot of cheese webcam software in action

Lens Cap
Remember to take the lens cap off otherwise you will end up focusing on the plastic cap as shown below. It is fairly obvious if this is the problem as moving the microscope will only change the light levels not the image.