Methods for motion correction for high-dynamic-range imaging systems

摘要

Electronic devices may include image sensors and processing circuitry. Image sensors may be used to capture multiple exposure images. Processing circuitry may be used to combine multiple exposure images into high-dynamic-range images. A motion correction method is provided that detects motion between multiple exposure images without using a frame buffer. A noise model is used to separate noise from motion for more accurate motion detection. A dilation operator may be used to enlarge a motion mask generated by the motion detector. Motion-corrected images may be generated from the multiple exposure images using a soft switch based on the motion strength. Motion-corrected multiple exposure images may be combined to generate a motion-corrected HDR image. A smoothing filter may be applied to the motion region of the motion-corrected HDR image. A blooming correction may be used to eliminate color artifacts in the motion-corrected HDR image.

主权项

1. A method of using an image sensor and processing circuitry in an electronic device to generate a motion-corrected high-dynamic-range image of a scene containing a moving object, the method comprising:
with the image sensor, capturing first and second images that include the moving object; with the processing circuitry, generating a motion mask, wherein the motion mask has non-zero pixel values in a motion region that corresponds to portions of the first image that include the moving object and portions of the second image that include the moving object and wherein the motion mask has pixels with values equal to zero outside the motion region; with the processing circuitry, generating a first corrected image by linearly combining the first and second images multiplied by the motion mask; and with the processing circuitry, generating a motion-corrected high-dynamic-range image based on a linear combination of the first corrected image and the second image.