Additionally, the 4S boasts of new features like a faster A5 dual core processor, better battery life and an improved camera with 1, 080 pixels resolution for high definition video.

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The closest they have managed is the Titan and Titan 2 handsets, which traded on little more than going for a very big screen (4.7 inches) and a monster count of pixels (with a 16 megapixel camera on the Titan 2).

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Consider this: at 1.4 microns this sensor's pixel size is identical to that of the iPhone 4S. This means that pixel for pixel, this shooter matches the competition -- it just uses five times more pixels per image than an 8-megapixel camera.

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This smartphone's camera is measured at 2 UltraPixels, which are larger than ordinary pixels and are designed to capture better quality images.

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Also integrated into the camera is a two-megapixel digital still camera capable of capturing an image with a maximum resolution of 1, 600 pixels by 1, 200 pixels.

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The HTC One's rear camera's sensor is bigger than those traditionally fitted to smartphones, and its pixels are also larger than normal.

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The camera offers both "high-resolution" (a measly 352 x 288 pixels) and low-resolution (176 x 144) settings, as well as a short video clip mode.

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X3 sensor consists of 3.5m pixels (3.5 megapixels) and will appear in a high-end consumer camera.

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Pixim's innovation is to give each pixel its own analog-to-digital converter so that photons are continuously converted to ones and zeros and the camera's microprocessor can tell exactly how fast each pixel is filling up relative to the other pixels.

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