STRUCT PISP_BE_SDN_CONFIG(9)

💅 struct pisp_be_sdn_config(9) — Kernel API Manual 🎀

okay bestie, sit down, because today we're learning about struct pisp_be_sdn_config — the PiSP Back End SDN config ✨ and yes, SDN stands for Spatial Denoise, and no, it's not a whole networking thing, it's pixels, it's vibes, it's denoising 🫶

She lives in the Kernel API Manual, she's a struct, and honestly? she's iconic.

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🌸 NAME 🌸

struct pisp_be_sdn_config — the PiSP Back End SDN config. that's it, that's the name, no notes 💅

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✨ SYNOPSIS ✨

struct pisp_be_sdn_config {
    __u16 black_level;
    __u8 leakage;
    __u8 pad;
    __u16 noise_constant;
    __u16 noise_slope;
    __u16 noise_constant2;
    __u16 noise_slope2;
 };

look at her. seven whole fields. each one doing her little job. not me being obsessed with a struct 😭

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🎀 Members 🎀

• black_level — the black level that gets subtracted from the pixel for noise estimation. she's doing the subtraction, she's the main character of the noise-math subplot 🌈
• leakage — the proportion of the original undenoised value that gets mixed into the denoised output. so like, how much of the old you stays in the new you 🦋
• pad — a padding byte. that's it. she's padding. she's holding space (literally) 💀
• noise_constant — the noise constant used for noise estimation. yes, the name said it. no, I'm not being unhelpful, I'm being faithful 💜
• noise_slope — the noise slope value used for noise estimation ⭐
• noise_constant2 — the second noise constant used for noise estimation. queen of the sequel 🍓
• noise_slope2 — the second slope value used for noise estimation. we love a matching set 👑

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🌼 Description 🌼

Spatial Denoise configuration. ✨ that's the whole description. lowkey chef's kiss, highkey mysterious, and honestly? we respect a short description 🧚

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🔥 SEE ALSO 🔥

okay this is the long part, and I am NOT skipping a single one of these, because every single cross-reference is a friend of the show 🫶 the kernel file, then the whole family:

• Kernel file ./include/uapi/linux/media/raspberrypi/pisp_be_config.h
• struct pisp_be_global_config(9)
• struct pisp_be_input_buffer_config(9)
• struct pisp_be_dpc_config(9)
• struct pisp_be_geq_config(9)
• struct pisp_be_tdn_input_buffer_config(9)
• struct pisp_be_tdn_config(9)
• struct pisp_be_tdn_output_buffer_config(9)
• struct pisp_be_stitch_input_buffer_config(9)
• struct pisp_be_stitch_config(9)
• struct pisp_be_stitch_output_buffer_config(9)
• struct pisp_be_cdn_config(9)
• struct pisp_be_lsc_config(9)
• struct pisp_be_lsc_extra(9)
• struct pisp_be_cac_config(9)
• struct pisp_be_cac_extra(9)
• struct pisp_be_debin_config(9)
• struct pisp_be_tonemap_config(9)
• struct pisp_be_demosaic_config(9)
• struct pisp_be_ccm_config(9)
• struct pisp_be_sat_control_config(9)
• struct pisp_be_false_colour_config(9)
• struct pisp_be_sharpen_config(9)
• struct pisp_be_sh_fc_combine_config(9)
• struct pisp_be_gamma_config(9)
• struct pisp_be_crop_config(9)
• struct pisp_be_resample_config(9)
• struct pisp_be_resample_extra(9)
• struct pisp_be_downscale_config(9)
• struct pisp_be_downscale_extra(9)
• struct pisp_be_hog_config(9)
• enum pisp_be_transform(9)
• struct pisp_be_output_buffer_config(9)
• struct pisp_be_hog_buffer_config(9)
• struct pisp_be_config(9)
• enum pisp_tile_edge(9)
• struct pisp_tile(9)
• struct pisp_be_tiles_config(9)

like, that's the whole friend group. the SDN config is one of them, and now you know all her mutuals 💖

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lowkey reminder bestie: the noise estimation fields all say "used for noise estimation" and I'm not going to invent extra lore for them. facts stay facts, vibes stay vibes 💅

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and that's the page!! source is ./include/uapi/linux/media/ras... (yes, truncated exactly like that, don't come for me), version date October 2026, brought to you by the Kernel API Manual. slay, study her, cite her correctly, periodt 🌟💜