VX6854LC datasheet(59/114 Pages) STMICROELECTRONICS

номер детали	VX6854LC

подробное описание детали	QXGA EDOF camera module

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VX6854LC

Video timing

6.1.4

Subsampling

Subsampling is achieved by programming the x _odd_inc, y_odd_inc, x_even_inc and

y_even_inc registers.

If the pixel being readout has an even address then the address is incremented by the even

increment value either x_even_inc or y_even_inc. If the pixel being readout has an odd

address then the address is incremented by the odd increment value either x _odd_inc or

y_odd_inc.

The sub_sampled readout is disabled by setting the odd and even increment values to 1.

Sub-sampling 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.

For the EDOF focus estimation to operate effectively, the x_even_inc and y_even_inc

registers must be 1.

The equation for the sub-sampling factor is given below:

Figure 19. Sub-sample readout example

sub_sampling_factor

even_inc

odd_inc

---------------------------------------------------

Gr R

56 7

123

010

Example:

x_even_inc=1

Control range:

min_even_inc=1

min_odd_inc=1

max_even_inc=7

max_odd_inc=7

x_odd_inc=3

y_even_inc=1

y_odd_inc=3

VX6854LC датащи(PDF) 59 Page - STMicroelectronics