VX6854LC datasheet(104/114 Pages) STMICROELECTRONICS

104 / 114 page

Defect categorization

VX6854LC

104/114

DocID027110 Rev 2

13.3

Pixel fault numbering convention

The pixel notation is described in Figure 44. For the purposes of the test the 3x3 array

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

Green (the Green pixels are split over 2 common channels, Green1 and Green2) or

Blue. The pixel under test is X. If a pixel under test is on the edge, the array is reduce to its

existing neighbor pixels (that is, the first pixel uses only a 2x2 array).

Figure 44. Pixel numbering notation

13.4

Single pixel faults

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

color neighbours. A single pixel fail can be a stuck at white where the output of the pixel is

permanently saturated regardless of the level of incident light and exposure level, a 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 neighbours by more than

the test threshold (minor fail).

The example in Figure 45 assumes that 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 45. Single pixel fault

[0]

[1]

[2]

[7]

[3]

[6]

[5]

[4]

[0]

[1]

[2]

[7]

[3]

[6]

[5]

[4]

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