ADE3000SX datasheet(43/88 Pages) STMICROELECTRONICS

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ADE3XXX

Data Measurement Block

In One-shot mode, the block indicates that measurement is valid through an auto-clear of start

condition.

In Free-running mode, the block indicates that measurement is valid through a polling bit. In Free-

running mode, a freeze bit is provided to freeze the results. Measurements continue with the polling

bit active, but they are not updated if the Freeze bit is set.

2.12.1 Edge Intensity

The Edge Intensity measurement is the sum of the absolute value of the delta between adjacent

pixels. A programmable threshold is applied to zero out noise and amplify edges.

Equation:

Delta_val = abs(pixelA - pixelB) - threshold;

Delta_val = Delta_val < 0 ? 0: Delta_val;

Sum += Delta_val;

For all 3 color channels:

Sum += Delta_val on Red channel + Delta_val on Green channel + Delta_val on Blue channel

2.12.2 Pixel Sum

The Pixel Sum is the sum of all selected pixels for either a specific color channel or all color

channels within the window specified.

2.12.3 Min / Max

The Min / Max reports the minimum and maximum pixel found withing the window specified.

2.12.4 PCD

Pixel cumulative distribution function reports the total number of pixels greater than (or less than) a

programmable threshold.

To switch between pixels greater than or pixel less than the threshold, a control bit is provided in the

DMM_Mode register when requesting a measurement.

2.12.5 H Position Min / Max

Horizontal position measures the start and end of video data in INCLKs relative to the posedge of

hsync.

Data horizontal start is defined as the number of INCLKs between posedge of hsync and the "first

data pixel".

First data pixel is either:

first pixel greater than the programmable threshold value, or

first pixel with the absolute value (current pixel - previous pixel) is greater than the

programmable threshold value

Data horizontal end is defined as the number of INCLKs between posedge of hsync and the "last

data pixel plus one". The search for the last pixels ends at the end of a window.

Last data pixel plus one is either:

pixel after the last pixel that is greater than the programmable threshold value,or

last pixel with the absolute value(current pixel - previous pixel) is greater than the

programmable threshold value.

When measurement is required, a control bit in the DMM_Mode register is used to switch between

the two threshold methods for first and last pixels.

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