MT9V024 datasheet(38/62 Pages) ONSEMI

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MT9V024_DSRev. G Pub. 4/15 EN

©Semiconductor Components Industries, LLC, 2015.

MT9V024: 1/3-Inch Wide-VGA Digital Image Sensor

Feature Description

The offset correction voltage is generated according to the following formulas:

Offset Correction Voltage = (8-bit signed two’s complement calibration value, – 127 to 127) × 0.25mV

(EQ 19)

ADC input voltage = (Pixel Output Voltage) * Analog Gain + Offset Correction Voltage × (Analog Gain + 1)

(EQ 20)

Defective Pixel Correction

Defective pixel correction is intended to compensate for defective pixels by replacing

their value with a value based on the surrounding pixels, making the defect less notice-

able to the human eye. The locations of defective pixels are stored in a ROM on chip

during the manufacturing process; the maximum number of defects stored is 32. There

is no provision for later augmenting the table of programmed defects. In the defect

correction block, bad pixels will be substituted by either the average of its neighboring

pixels, or its nearest-neighbor pixel, depending on pixel location.

Defective Pixel Correction is enabled by R0x07[9]. By default, correction is enabled, and

pixels mapped in internal ROM are replaced with corrected values. This might be unac-

ceptable to some applications, in which case pixel correction should be disabled

(R0x07[9] = 0).

For complete details on using Defective Pixel Correction, refer to TN-09-250, “Defective

Pixel Correction - Description and Usage”.

Row-wise Noise Correction

Row-wise noise correction is controlled by the following registers:

•R0x70 Row Noise Control

•R0x72 Row Noise Constant

Row-wise noise cancellation is performed by calculating a row average from a set of opti-

cally black pixels at the start of each row and then applying each average to all the active

pixels of the row. Read Dark Columns register bit and Row Noise Correction Enable

behavior when Read Dark Columns register bit = 0 and Row Noise Correction Enable

The algorithm works as follows:

Logical columns 755-790 in the pixel array provide 36 optically black pixel values. Of the

36 values, two smallest value and two largest values are discarded. The remaining 32

values are averaged by summing them and discarding the 5 LSB of the result. The 10-bit

result is subtracted from each pixel value on the row in turn. In addition, a positive

constant will be added (Reg0x71, bits 7:0). This constant should be set to the dark level

targeted by the black level algorithm plus the noise expected on the measurements of

the averaged values from dark columns; it is meant to prevent clipping from negative

noise fluctuations.

Pixel value = ADC value – dark column average + R0x71[9:0]

(EQ 21)

Note that this algorithm does not work in color sensor.

MT9V024 Datasheet(PDF) 38 Page - ON Semiconductor

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