DEVICE FOR ACQUIRING BIMODAL IMAGES

摘要

The invention relates to an image acquisition device comprising a sensor composed of an array of photosensitive pixels, and an array of elementary filters covering the sensor. Pixels may be of three different types: panchromatic pixels, primary colour pixels and infrared pixels. Under low illumination conditions, the device displays a monochrome image using panchromatic pixels, and under high illumination conditions, a colour image with a high signal to noise ratio, by combining primary colour images and subtracting the infrared image.

主权项

1. Image acquisition device comprising a sensor composed of an array of photosensitive elements called pixels, an array of elementary filters covering said sensor, each elementary filter being associated with a corresponding pixel, and processing means, characterised in that:
the elementary filter array comprises primary colour filters, where a primary colour filter only transmits one primary colour, filters transmitting the entire visible spectrum called panchromatic filters, and infrared filters transmitting the near infrared, the panchromatic filters representing at least 50% of said elementary filters; processing means are designed to: calculate an average luminance on a set of panchromatic pixels to determine if at least one sensor zone is under low or high illumination conditions; if said zone is under low illumination conditions, form a monochrome image of said zone using the panchromatic pixels; if said zone is under high illumination conditions, form a colour image of said zone using primary colour pixels and subtract an infrared image from said zone obtained from infrared pixels.