ADE3000SXT STMicroelectronics, ADE3000SXT Datasheet - Page 43

• Manufacturer Part Number: ADE3000SXT
• Description: LCD Display Engines with Integrated DVI/ ADC and YUV Ports
• Manufacturer: STMicroelectronics

ADE3XXX
2.12.1 Edge Intensity
2.12.2 Pixel Sum
2.12.3 Min / Max
2.12.4 PCD
2.12.5 H Position Min / Max
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.
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
The Pixel Sum is the sum of all selected pixels for either a specific color channel or all color
channels within the window specified.
The Min / Max reports the minimum and maximum pixel found withing the window specified.
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.
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:
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:
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.
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
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.
Data Measurement Block
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