29 lines
1.1 KiB
Markdown
29 lines
1.1 KiB
Markdown
# Inverse 2D FFT
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Reconstruct a spatial-domain image from a 2D frequency spectrum. For exact reconstruction, connect magnitude/phase (or log magnitude/phase, or PSDF/phase) from the 2D FFT node. If phase is omitted, zero phase is assumed.
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## Inputs
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| Name | Type | Required | Description |
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|------|------|----------|-------------|
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| spectrum | DATA_FIELD | Yes | Frequency-domain field (output of FFT 2D) |
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| phase | DATA_FIELD | No | Phase field; if omitted, zero phase is used |
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## Outputs
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| Name | Type | Description |
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|------|------|-------------|
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| image | DATA_FIELD | Reconstructed spatial-domain field |
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## Controls
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| Name | Type | Default | Description |
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|------|------|---------|-------------|
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| representation | dropdown | magnitude | How to interpret the spectrum input: magnitude, log_magnitude, or psdf |
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## Notes
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- The spectrum input must be a frequency-domain DATA_FIELD; connecting a spatial-domain field raises an error.
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- If phase is connected, it must also be a frequency-domain field with the same shape as the spectrum.
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- Reconstruction from PSDF (which discards phase) assumes zero phase and produces a symmetric result.
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