VX6953CB datasheet(79/107 Pages) STMICROELECTRONICS

79 / 107 page

8209023 Rev 5

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VX6953CB

Image optimization

9.1.3

Pixel fault numbering convention

The pixel notation is shown in Figure 34. For the purposes of the test the 3 x 3 array

describes nine Bayer pixels of a common color, that is, all the pixels will either be Red,

Green(a) or Blue. The pixel under test is X. If a pixel under test is on the edge, the array is

reduced to its existing neighbor pixels (that is, the first pixel uses only a 2 x 2 array).

Figure 34. Pixel numbering notation

9.1.4

Single pixel faults

STMicroelectronics defines a single pixel fail as a failing pixel with no adjacent failing same

color neighbors.

A single pixel fail can be:

•

“stuck at white” where the output of the pixel is permanently saturated regardless of the

level of incident light and exposure level

•

“stuck at black” where the pixel output is zero regardless of the level of incident light

and exposure level (major fail) or simply a pixel that differs from it’s immediate

neighbors by more than the test threshold (minor fail).

In the example in Figure 35, the pixel X is a fail. For this pixel to be a single pixel fail the

pixels at positions [0], [1], [2], [3], [4], [5], [6] and [7] must be “good” pixels that pass final

test. The implemented test program will pass a sensor with up to the defined limit of single

pixel faults per color channel. Defect correction algorithms will correct the pixel faults in the

final image.

Figure 35. Single pixel fault

a. The Green pixels are split over two common channels, Green1 and Green2.

[0]

[1]

[2]

[7]

[3]

[6]

[5]

[4]

[0]

[1]

[2]

[7]

[3]

[6]

[5]

[4]

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