VX6854LC datasheet(58/114 Pages) STMICROELECTRONICS

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VX6854LC

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Figure 17. Scaler quality

Down scaler factor

The down scaler factor is controlled by an M/N ratio, scale_m is >= 16 and scale_n is fixed

at 16. scale_m is in the range 16 to 129.

This single down scale factor is used by both the horizontal and vertical scalers.

The scaler acts upon the addressed region of the array which is determined by the

x_addr_start, y_addr_start, x_addr_end and y_addr_end registers.

If the down scale factor is greater than 1.0, then the derating factor must also be set greater

than 1.0. Refer to Section 6.2.4: Derating on page 63 for details.

Note:

The derating can be set to a minimum value, for example if op_pix_clk_div=10, setting

vt_pix_clk_div=9 would meet this requirement.

Figure 18. Example image full scaled by a downscale factor of 2

Pixel array output

Bayer sampled scaling

Co-sited sampling

down_scale_factor =

scale_m

scale_n

Downscale by 2

Full (Horizontal and Vertical) Scaling

Raw Bayer Image

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