Specifications

Image processing

Pearleye Technical Manual V2.0.0

Image processing

This chapter explains the function of the Pearleye P-007 LWIR /

Pearleye P-030 LWIR firmware. It is related to the individual modules of image

processing and shows in what way the user can control these modules via the

serial interface.

Image processing chain

Due to the fact that the uncorrected sensor image from the microbolometer sen-

sor is very inhomogeneous and that each sensor element has its own character-

istic curve, an individual adjustment of each pixel is necessary. The standard

firmware of the Pearleye P-007 LWIR / Pearleye P-030 LWIR contains a chain

of correction modules which undertake these tasks in real time.

Each module can have various parameters which control the operation mode. In

the drawing above and as well within the text of this manual, these parameters

are always marked by Courier bold font in order to highlight them to be

parameters (or commands) adjustable via the serial Interface.

For fast access all available correction data (e.g. reference images for the two-

point correction and bad pixel correction control data) are copied from the non-

volatile flash memory into a correction data memory (SDRAM) when starting the

camera. From this point the correction data is available for real-time image cor-

rection. The image data from the camera head is shifted through the correction

modules and the corresponding correction data is applied. Some modules may

also write new data back to the correction memory: but currently only to the

SDRAM and not to the non-volatile Flash memory.

Figure 12: Image processing chain: Pearleye P-007 LWIR / Pearleye P-030 LWIR