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authorMilan Zamazal <mzamazal@redhat.com>2024-11-28 13:52:24 +0100
committerKieran Bingham <kieran.bingham@ideasonboard.com>2024-12-06 12:34:48 +0000
commit9135aacff1fa8aa6af1a44493c6ec8abfbde31a3 (patch)
tree125208560971e5a44a9ded403b5ff59686e5ee37 /src/apps/qcam
parentc11e536ed2c379c0c3d24400fc9607c7135c02d2 (diff)
libcamera: software_isp: Add support for contrast control
Software ISP is currently fully automatic and doesn't allow image modifications by explicitly set control values. The user has no means to make the image looking better. This patch introduces support for contrast control, which can improve e.g. a flat looking image. Based on the provided contrast value, it applies a simple S-curve modification to the image. The contrast algorithm just handles the provided values, while the S-curve is applied in the gamma algorithm on the computed gamma curve whenever the contrast value changes. Since the algorithm is applied only on the lookup table already present, its overhead is negligible. The contrast value range is 0..2 and corresponds to the whole range from a completely flat contrast to an infinite contrast, 1.0 being the normal value. This makes the user visible range intuitive and easy to use in GUI sliders, while complying with Contrast control definition. There is no unified range in the hardware pipelines, for example rkisp1 uses 0..1.993 range while rpi uses 0..10 range. This is a preparation patch without actually providing the control itself, which is done in the following patch. Signed-off-by: Milan Zamazal <mzamazal@redhat.com> Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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