In the various field components of frequency electromagnetic sounding of point double source (including CSAMT),the point field E x component has the advantages such as higher resolution,higher observation signal to noise ratio,need not near field correction and so on.

For the high-speed multi-frame camer used to capture time-resolved sequence images,the main image processing includes geometric distortion calibration,image pixel position arrangement,flat-field correction for photo-response non-uniformity between the pixels in one image and the response calibration between different sequence images.