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AP0100CS HDR: Image Signal Processor (ISP)

Spatial Transform Engine (STE)

AP0100CS/D Rev. 6, Pub. 1/16 EN

©Semiconductor Components Industries, LLC,2016.

Spatial Transform Engine (STE)

A spatial transform is defined as a transform in which some pixels are in different posi-

tions within the input and output pictures. Examples include zoom, lens distortion

correction, turn, and rotate. STE is a fully programmable engine which can perform

spatial transforms and eliminates the need for an expensive DSP for image correction.

Lens Distortion Correction

Automotive backup cameras typically feature a wide FOV lens so that a single camera

mounted above the center of the rear bumper can present the driver with a view of all

potential obstacles immediately behind the full width of the vehicle. Lenses with a wide

field of view typically exhibit at least a noticeable amount of barrel distortion.

Barrel distortion is caused by a reduction in object magnification the further away from

the optical axis.

For the image to appear natural to the driver, the AP0100CS corrects this barrel distor-

tion and reprocesses the image so that the resulting distortion is much smaller. This is

called distortion correction. Distortion correction is the ability to digitally correct the

lens barrel distortion and to provide a natural view of objects. In addition, with barrel

distortion one can adjust the perspective view to enhance the visibility by virtually

elevating the point of viewing objects.

Pan, Tilt, Zoom and Rotate

Using the STE it is possible to implement image transformations like Pan, Tilt, Zoom and

Rotate.

Figure 23:

Uncorrected Image

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