Digital Cameras Image Quality

The past twenty years, most of the major technological advances in consumer electronics have been built around the same basic process: the conversion conventional analog information (represented by a variable wave) into digital information (binary information represented by zeros and ones, or bits). This fundamental shift in technology has changed the way we deal with visual information and audio – is completely redefined what is possible.

The digital camera is one of the most notable examples of this change, because it is really different from its predecessor. Conventional film cameras depend entirely of chemical and mechanical processes – you do not need any power whatsoever to operate them, and a flash. Furthermore, all digital cameras have a built-in computer, and all of them record images electronically.

The new approach has been extremely successful. Since film usually provides better quality of image, digital cameras has completely replaced conventional cameras. But as digital imaging technology has improved and prices fell dramatically digital cameras have rapidly become more popular.

In this article, we find out exactly what is going on inside these amazing devices the digital age.

Understanding the Basics

Let's say you want to take a picture and email it to a friend. To do this, you need the image to be represented in the language that computers recognize – bits and bytes, or binary information. Essentially, a digital image is just a long string of 1s and 0s that represent all the small colored dots – or pixels – that form the image. If you want to get an image to this form, you have two options:

1) You can take a photograph using a conventional film camera, take the film to a laboratory for the development of processes that the film chemically, print on paper photo, and then place the image of a digital scanner to sample the print (record the pattern of light as a series of pixel values).

2) You can directly prove the original light that bounces off your subject, immediately breaking the pattern of light down into a series of pixel values – in other words, you can use a digital camera.

In its most basic level, this is all there is to a digital camera. Like a camera conventional film, has a series of lenses that focus light to create an image of a scene. But instead of focusing this light on a piece of film, focuses it to a device semiconductor that records light electronically. A computer then breaks this electronic information into digital data. All the fun and interesting features digital cameras come as a direct result of this process.

Instead of film, a digital camera has a sensor that converts light into electrical charges.

The image sensor employed by most digital cameras is a charge coupled device (CCD). Some cameras use complementary metal oxide semiconductor (CMOS) technology time. Both CCD image sensors and CMOS sensors convert light into electrons. Without getting too technical, a simplified way of thinking about these sensors is to think in a 2-dimensional array of thousands or millions of tiny solar cells.

Once the sensor converts light into electrons, it reads the value (load cumulative) of each cell in the image. This is where the differences between the two main types of sensors become a factor:

A CCD transports the charge across the chip and read it in a corner of the array. Analog to digital converter (ADC) then converts the value of each pixel in a digital value by measuring the amount of cargo each photosite and converting that measurement to binary form. CCD sensors create high-quality, low-noise images. CCD sensors have been mass produced for a long period of time, so they are more mature. They tend to have higher quality pixels, and most of them.

CMOS devices use several transistors at each pixel to amplify and move the load using common threads. The CMOS signal is digital, so it does not need ADC. Because each pixel in a CMOS sensor has several transistors located next him, the light sensitivity of a CMOS chip is lower (many photons hit the transistors instead of the LED.) CMOS sensors traditionally consume little power. CCDs the other hand, the use of a process that consumes lots of energy.

Resolution

The amount of detail that the camera can capture is called the resolution, and is measured in pixels. The more pixels a camera has, the more detail you can capture and images can be larger without becoming blurry or "grainy". High-end consumer cameras can capture more than 12 million pixels. Some professional cameras support over 16 million pixels, or 20 million pixels for large format cameras. For comparison, Hewlett Packard believes that the quality of 35mm film is about 20 million pixels.

Exposure and Focus

As with the film, a digital camera has to control the amount of light reaching the sensor. The two components that it uses to do this, openness and speed shutter, are also present in conventional cameras.

Aperture: The size of the opening in the camera. The aperture is automatic in most cameras digital, but some allow manual adjustment to give professionals and hobbyists more control over the final image.

Shutter speed: The amount of time that light can pass through the opening. Unlike film, the light sensor in a digital camera can be replaced by electronic, digital cameras have so a digital shutter rather than a mechanical shutter.

These two aspects work together to capture the amount of light needed to make a good image. In cameras, they set the exposure of the sensor.

About the Author:

By Brian Lee

Article Source: ArticlesBase.com – Digital Camera Basics-Images

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