My focus keeps blurring for a while and then for no apparent reason corrects its self

Blurred images are caused by several reasons: motion due to camera shake, use of slow shutter speeds and failure of the camera to focus correctly.

Slow shutter speeds

When light is low, wide apertures and slow shutter speeds will be selected automatically by the camera. Most people can't take blur-free, hand-held shots when the shutter speed is under 1/60th of a second.

Cameras that have optical Image Stabilization help but even IS has its limits. Increase room lighting, increase the ISO setting or use a tripod, or use a combination of all three.

Blurred images or misfocus

If an image is blurred due to camera shake, the blur will appear throughout the entire image. If parts of an image are in focus, and others are not, you've misfocused.

There are three main reasons photos don't come out clear.
The first is focus. If your photo has something in the near foreground and something in the distant background, you may not get both in focus. This is not as much of a problem with compact point&shoot cameras simply because their field of focus is so deep.
The second cause is subject motion. If you take a photo of a moving object, that object may blur. This is the case if moving objects blur but still objects do not.
The third and main cause is camera motion. If you suspect this, try placing the camera on a table or other stable surface, use the self-timer, and take a photo. Compare this photo with one you take holding the camera.

There are three main reasons photos don't come out clear.
The first is focus. If your photo has something in the near foreground and something in the distant background, you may not get both in focus. This is not as much of a problem with compact point&shoot cameras simply because their field of focus is so deep.
The second cause is subject motion. If you take a photo of a moving object, that object may blur. This is the case if moving objects blur but still objects do not. The third and main cause is camera motion. If you suspect this, try placing the camera on a table or other stable surface, use the self-timer, and take a photo. Compare this photo with one you take holding the camera.

You are dealing with "depth of field", or simply put (?), the range from near to far of an image that appears in focus. To increase the depth of focus, the camera must be set to a smaller aperture (higher numbered). Using a wider angle lens helps also. Focusing on the mid-point (near to far range) will also increase the apparent focus range. This is one of the most complicated photographic issues, and much has been written about it. Google "depth of field" for about 4 million explanations.

That sounds like a faulty CCd sensor.

Your TV requires Geomatirc Adjustments in proper manner by qualified servcie person.

There can be several reasons for blurred pictures.
Are you taking the picture in enough light? Is auto focus turned on? If not, are you focusing correctly? What sort of camera are you shooting with?

I don't think there's any problem. Simply, a longer zoom means that - without a faster shutter speed - there is an increased probability for camera shake. Additionally, cameras usually struggle with focus in longer zoom. To be sure that there isn't a fault, do this:

1) Place the camera on a tripod or other sturdy surface
2) For additional stability (and to avoid camera shake due to shutter button movement), select the self-timer
3) Focus and take the shot.
If it's still blurry, then yeah, there's a problem

There are several factors that can contribute to getting better focus and improved results. 1. Auto Focus / Auto Exposure lock. Press the shutter button down HALF WAY. The camera will attempt to adjust exposure to the current lighting environment for maximum benefit. Then the camera will automatically correct the focus based on objects in the center of the display. This process usually takes about two to three seconds. 2. Be sure not to cover the sensor on the front of the camera with your finger. This will disable the automatic focus and exposure controls. 3. Only us the MACRO MODE for CLOSE-UP photography. Be sure to use MACRO MODE if you are taking pictures of an object at less than six inches away. Be sure not to use Macro Mode for Normal Photography. Using MACRO MODE improperly will result in poor focus (also known as 'fuzzy pictures'). 4. Motion can cause a "blur" effect. Either motion of the subject, or motion by the photographer. This phenomenon is just like traditional photography. Moving objects may appear to blur, and this will be even more evident in lower lighting situations as the shutter speed slows down to allow for more light. The shutter will react faster in bright light, and motion will not be as apparent.

There are several factors that can contribute to getting better focus and improved results. 1. Auto Focus / Auto Exposure lock. Press the shutter button down HALF WAY. The camera will attempt to adjust exposure to the current lighting environment for maximum benefit. Then the camera will automatically correct the focus based on objects in the center of the display. This process usually takes about two to three seconds. 2. Be sure not to cover the sensor on the front of the camera with your finger. This will disable the automatic focus and exposure controls. 3. Only us the MACRO MODE for CLOSE-UP photography. Be sure to use MACRO MODE if you are taking pictures of an object at less than six inches away. Be sure not to use Macro Mode for Normal Photography. Using MACRO MODE improperly will result in poor focus (also known as 'fuzzy pictures'). 4. Motion can cause a "blur" effect. Either motion of the subject, or motion by the photographer. This phenomenon is just like traditional photography. Moving objects may appear to blur, and this will be even more evident in lower lighting situations as the shutter speed slows down to allow for more light. The shutter will react faster in bright light, and motion will not be as apparent.