Quote:
Originally Posted by Fillmore Hi,
Require some suggestions from the phone experts here.
Am looking for a simple camera phone that can take good pictures and has an 'Anti-Shake' built in.
i.e. even if there is slight movement at the time of clicking, the phone does not give a blur picture. |
One of every five cameraphone users use their cameraphone as their primary camera.
Me too! That's why I bought my Nokia N82. It has a 5 megapixel sensor, autofocusing 4-element lens, mechanical shutter and Xenon flash. Always available in the pocket, invisible unobtrusive while shooting, and yields adequately detailed 5 mp images that can be cropped and resized later.
But we'll soon go beyond 5 megapixels. What will happen then? Camera shake will be increasingly, reason to reject high-megapixel images, unless you can mount the camera phone on a tripod.
Natural hand jitter is the biggest cause of blurred images. Optical zoom becoming available to us will aggravate the problem.
Digital Still Cameras (DSCs) have had image stabilization solutions, for some time now.
But a cameraphone is so dimunitive and has densely packed circuitry -- phone, FM radio, GPS, accelerometers, what not..., and expects to be powered off a tiny Li-ion battery.
Optical image stabilizing components are too bulky, power-hungry and expensive for phones.
Enter
Digital Image Stabilization (for cheap cameraphones) and
Optical Image Stabilization (expensive cameraphones)
Digital Image Stabilization
The cheap interim way to go is use extremely (ISO) sensitive sensors, and motion vector calculations in software.
The NTT N902i (this is a Kyocera W41K phone) takes a a series of high ISO images in quick succession when the picture is taken. Motion vector software then synthesizes the original image using all of these as reference and comes up with an ultra clear sharp image.
However, this is both CPU intensive and memory intensive. Also the more sensitive the sensor, the more pixel noise. That is a problem to live with until greater miniaturization is possible.
Another is the Casio W53A. This baby has a 5.1 megapixel camera and 800x480 display and digital image stabilization.
LG's Viewty KU990 and Sony Ericsson K850i, both feature digital image stabilisation.
Optical Image Stabilization
Another way is to use Gyro sensors. These use piezoelectric, ring laser, fiber-optic, spinning mass, and capacitance tech. to stabilize the image.
An American co. called InvenSense produces micro dual-axis rate gyroscopes and single chip image stabilization for this. There's MEMS (Micro-Electro-Mechanical Systems) tech. at your service!
This is a single-chip silicon device based on MEMS tech, smaller than competing piezo-tech devices.
They use gyro data to accurately track the hand jitter and compensate in real time by
physically moving the lens or the sensor module.
Performance is outstanding, but expensive and requires significant optics expertise while assembling the phone.
Some Sanyo phones are planned, using this technology.
This will be useful when we go to 10 megapixel cameraphones.
Ram