Decoding of the each line info block - RGB

Pixel	0	1	2	3	4	5	6	7	8	9
Red	Marker	Error code	Speed2high	Encoder clocks	Next line position	Time stamp	Unsupported	Unsupported	Unsupported	Marker
Green	Continuous line count	Line count	Line time
Blue	Continuous line count	Line count	Line time

Continuous line count

This counter increments by 1 for each row of the image. The counter continues counting for new images and is not reset. It can be used to detect missing image information.

Structure

	Continuous line count
–	Byte 1	Byte 0
P_x0Red	P_x0Green	P_x0Blue

Decoding

The decoding of the continuous line count is:

C_lc = P_x0Green × 256 + P_x0Blue

Example

C_lc = 217 × 256 + 127 = 55679

svg-read each line-continuous line count_03 — Example: Decoding of continuous line count

Line count

This counter increments by 1 for each row of the image. The counter starts counting at 0 for each image. It can be used to detect missing image information.

Structure

	Line count
–	Byte 1	Byte 0
P_x1Red	P_x1Green	P_x1Blue

Decoding

The decoding of the line count is

L_c = P_x1Green × 256 + P_x1Blue

Example

L_c = 0 × 256 + 0 = 0

svg-read each line-line count_03 — Example: Decoding of line count

Speed too high

This information can be used to check if the speed of the line trigger signal is too high for the camera. In this case, the camera switches to freerun and acquires with the maximum possible speed. This state must be avoided because the transport resolution of the image is not constant. If the flag is “True” for some lines there are the following options to avoid this issue.

The speed too high state can be caused by two parameters

Exposure time (Exposure time ≥ Line time - 2us offset)
Compare the exposure time with the info block information “line time“ to check if the exposure time is the limiting factor.
Interface speed

To avoid the speed too high state there are multiple options.

Reduce the transport speed if possible.
If the info block information “line time“ oscillates heavily check the electrical connection or try to stabilize the mechanical transportation process.
If the exposure time is the limiting factor reduce the exposure time.
If the interface speed is the limiting factor, increase the interface speed is possible (Use more CXP lanes or a faster CXP type / Use dual 10GigE)

Structure

Speed2high	–
Bit 7	Bit 6 – Bit 0
P_x2Red

Line time

This information represents the line time. For an operation without a line trigger, this variable is constant and equal to the camera parameter line time. If the camera is triggered with a line trigger this information can be used to check the signal/mechanical transport quality.

If the signal oscillates very heavily with a high frequency the electrical connection is not OK.

Small oscillations (for example +-20%) are most probably mechanical vibrations in the transport process.
These effects are typical for:
- Belt drives
- Conveyor belts
- Low-quality linear stages for scans with a high resolution.

Structure

	Line time clocks
Bit 7 – Bit 4	Bit 3 – Bit 0	Byte 1	Byte 0
P_x2Red		P_x2Green	P_x2Blue

Decoding

The decoding of the line time is:

L_t = (P_x2Red × 2¹⁶ + P_x2Green × 2⁸ + P_x2Blue) / 100

Example

L_t = (0 × 2¹⁶ + 21 × 2⁸ + 124) / 100 = 55 µs

Encoder clocks

Private notes

Welchen Mehrwert bringt diese Information? Reicht hier nicht der Encoder clocks im First line infoblock?

Structure

Encoder clocks
Byte 2	Byte 1	Byte 0
P_x3Red	P_x3Green	P_x3Blue

Decoding

The decoding of the encoder clocks is:

E_c = P_x3Red × 2¹⁶ + P_x3Green × 2⁸ + P_x3Blue

Next line trigger position

Private notes

Welchen Mehrwert bringt diese Information? was kann der Kunde damit anfangen?

Structure

Next lt pos raw
Byte 2	Byte 1	Byte 0
P_x4Red	P_x4Green	P_x4Blue

Decoding

The decoding of the encoder clocks is:

N_lp = (P_x4Red × 2¹⁶ + P_x4Green × 2⁸ + P_x4Blue) / 256

Time stamp

Private notes

Welchen Mehrwert bringt diese Information? Reicht hier nicht der Time stamp im First line infoblock? Die Auflösung von 250us ist ohnehin zu gering für Einzelzeilen. Hier ist man wesentlich genauer wenn man die einzelnen Linetimes aufsummmiert.

Structure

Time [s]		Time [¼ ms]
Byte 2	Byte 1	Byte 0
P_x5Red	P_x5Green	P_x5Blue

Decoding

The decoding of the time stamp is:

T_s = (P_x5Red × 2¹⁶ + P_x5Green × 2⁸ + P_x5Blue) / 4

Decoding of the each line info block - mono

Pixel	0	1	2	3	4	5	6	7	8	9
Mono		Continues line count	Continues line count	Speed to high / Line time	Line time	Encoder Clocks	Encoder Clocks	Encoder Clocks	State of external input line

Continues line count

This counter increments by 1 for each row of the image. The counter continues counting for new images and is not reset. It can be used to detect missing image information.

Structure

Continuous line count
Byte 1	Byte 0
P_x1(Content of Pixel Position 1)	P_x2

Decoding

The decoding of the continuous line count is:

C_lc = P_x1 × 256 + P_x2

Line time

This information represents the line time. For an operation without a line trigger, this variable is constant and equal to the camera parameter line time. If the camera is triggered with a line trigger this information can be used to check the signal/mechanical transport quality.

If the signal oscillates very heavily with a high frequency the electrical connection is not OK.

Small oscillations (for example +-20%) are most probably mechanical vibrations in the transport process.
These effects are typical for:
- Belt drives
- Conveyor belts
- Low-quality linear stages for scans with a high resolution.

Structure

Line time
Byte 1	Byte 0
P_x3	P_x4

Decoding

The decoding of the line time is:

L_t = (P_x3 × 2⁸ + P_x4)× 2⁵ / 100

Encoder clocks

24Bit encoder counter. Starts with Power on at 0 and overflows at 2^24. Counts, depending on the operating mode set, either the line trigger pulses or the encoder pulses. Can be used as location information of the document within the batch (sequence).

Can be reset via EnableIncremets(SelectEncoder(9:7)).

Structure

Encoder clocks
Byte 2	Byte 1	Byte 0
P_x5	P_x6	P_x7

Decoding

The decoding of the encoder clocks is:

E_c = P_x5 × 2¹⁶ + P_x6 × 2⁸ + P_x7

State of external Inputs

Structure

State of external Inputs
Byte 0
P_x8

Output List

Line	Output Signal in Pixel position 8
Line1	8
Line2	9
Line3	10
Line4	11
Line5	12
Line6	13
Line7	14
Line8	15

Decoding

The decoding of the encoder clocks is:

E_i = P_x8

Camera	Mechanical compatible	Software adjustment tool
allPIXA evo	YES	YES -> GCT
allPIXA neo	YES	YES -> GCT
allPIXA SWIR	YES	YES -> GCT
allPIXA wave	YES	NO -> CST
allPIXA pro	YES	NO -> CST

Overview Alignment allPIXA Line Scan Cameras