Front-scan sonar image splicing method
An image mosaic and image technology, which is applied in image enhancement, image analysis, image data processing, etc., can solve problems such as differences, hard work of interpreters, and difficulties in detection and recognition
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[0119] Example one:
[0120] Attached figure 1 It is a flow chart of a method for splicing forward-scan sonar images in an embodiment of the present invention. Such as figure 1 As shown, the operation steps of this front scan sonar image stitching method include the following:
[0121] 1. Sonar image input: The echo data received by the front scan sonar is displayed as a gray-scale image through DIDSON's own software.
[0122] 2. Feature point detection and description:
[0123] The feature point detection and description between the sonar image to be matched and the reference sonar image is realized by the SURF algorithm:
[0124] ⑴ Integral image
[0125] The integral image can greatly improve the calculation efficiency of the frame-shaped convolution filter. For a point in the integral image , ,Available:
[0126] (1)
[0127] among them, Represents the origin and point in the original image The sum of all pixel values in the formed rectangula...
Example Embodiment
[0203] Embodiment two:
[0204] Step (7) Image fusion is another preferred embodiment of the present invention. The steps of image fusion include the following:
[0205] A boundary-preserving weighted smoothing algorithm is used to realize the fusion of the sonar image: two adjacent frames of the sonar image with a small viewing angle range are scanned before the sonar image. Generally, due to the difference of the sampling time and the sampling angle, the overlapping part will have uneven brightness In order to make the overlapping parts of two adjacent images have visual consistency and no obvious seams, this solution adopts the method of image gray-scale stretching to improve the contrast of the image, and the brightness of different frames The adjustment is consistent to enhance the resolution of the image; and a weighted smoothing algorithm with boundary preservation is used to achieve the fusion of the registered image.
[0206] Such as Picture 10 As shown, , Are two adj...
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