VV6501 datasheet(53/60 Pages) STMICROELECTRONICS

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VV6501

Defect Categorisation

8.4

Pixel fault definitions

8.4.1

Pixel fault numbering convention

Please find the pixel notation described in

Figure 31 below. For test purpose, the 3x3 array

describes 9 Bayer pixels of a common color, that is all the pixels will either be Red, Green or Blue.

The pixel under test is X.

8.4.2

Single pixel faults

STMicroelectronics define a single pixel fail as a failing pixel with no adjacent failing neighbors of the

same colour. 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 or simply a pixel that

differs from its immediate neighbors by more than the test threshold, that is differ by more than 8.0%

from pixel average of color space neighbors.

In the example below in

Figure 32, we assume that the pixel ‘X’ is a fail. This pixel is qualified as

single pixel fail if the pixels at positions [0],[1],[2],[3],[4],[5],[6] and [7] are “good” pixels that pass the

final test. The implemented test program qualifies a sensor with up to 120 single pixel faults. Defect

correction algorithms correct the single pixel faults in the final image.

Figure 31: Pixel numbering notation

Figure 32: Single pixel fault

[0]

[1]

[2]

[7]

[3]

[6]

[5]

[4]

[0]

[1]

[2]

[7]

[3]

[6]

[5]

[4]

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