ASICFPGA offers an ISP pipeline with many features, including HDR processing, but, apparently, not including small pixel support:
The company's demo video shows the HDR capabilities:
- Support RGB Bayer progressive image sensor
- Support 8 ~ 14 bit input data Bayer
- Support image sensor of 256*256 ~ 8192*8192 size
- Defect Correction
- Lens Shading Correction
- High quality interpolation
- 3D Motion Adaptive noise reduction and 2D noise reduction
- Color correction by 3x3 matrix
- Gamma correction
- HDR processing for Multiple exposure images and HDR bayer image
- WDR (Shadow/Highlight compensation, back light compensation)
- 2D edge enhancement
- support AE, AWB and AF
- Saturation, contrast and brightness control
- Support special images (sepia, negative, solarization)
The company's demo video shows the HDR capabilities: