SENSOR DATA RESCALER FOR IMAGE SIGNAL PROCESSING

摘要

An input rescale module that performs cross-color correlated downscaling of sensor data in the horizontal and vertical dimensions. The module may perform a first-pass demosaic of sensor data, apply horizontal and vertical scalers to resample and downsize the data in the horizontal and vertical dimensions, and then remosaic the data to provide horizontally and vertically downscaled sensor data as output for additional image processing. The module may, for example, act as a front end scaler for an image signal processor (ISP). The demosaic performed by the module may be a relatively simple demosaic, for example a demosaic function that works on 3×3 blocks of pixels. The front end of module may receive and process sensor data at two pixels per clock (ppc); the horizontal filter component reduces the sensor data down to one ppc for downstream components of the input rescale module and for the ISP pipeline.

主权项

1. An apparatus, comprising:
an image signal processor comprising an image processing pipeline for processing images captured by an image sensor; and an input rescale module configured to:
receive sensor data for an image according to an image sensor format that represents different color channels as separate pixels;demosaic the received sensor data to generate color space data according to a color space that includes two or more color channels in each pixel;apply a horizontal filter to the color space data to horizontally downscale the color space data;apply a vertical filter to the color space data output from the horizontal filter to vertically downscale the color space data;remosaic the horizontally and vertically downscaled color space data to generate horizontally and vertically downscaled sensor data according to the image sensor format; andoutput the horizontally and vertically downscaled sensor data to the image processing pipeline of the image signal processor.