Bidirectional iteration bilateral filtering method for asphalt images obtained through UAV-borne infrared imaging device

Abstract

The invention discloses a bidirectional iteration bilateral filtering method for asphalt images obtained through an UAV-borne infrared imaging device. The method includes a first step of taking original infrared asphalt images by utilizing an unmanned aerial vehicle (UAV), a second step of switching original infrared asphalt images in RGB color space to a Lab color space, a third step of expanding the image boundaries by using the boundary pixels of the infrared asphalt images in the Lab color space obtained in the second step, a forth step of conducting lateral filtering on the images obtained in the third step, a fifth step of conducting vertical filtering on the images obtained in the fourth step, and a sixth step of switching images in the Lab color space processed in the step 5 to the RGB color space and outputting filtered infrared asphalt images. Lateral and vertical bi-directional iteration bilateral filtering means is employed, infrared asphalt image noises can be rapidly eliminated, and the edge detail can be retained. The infrared asphalt image filtering effect is satisfactory, and edge information of images can be retained.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a bidirectional iterative bilateral filtering method for acquiring asphalt images carried by drones through infrared. Background technique [0002] In recent years, with the development of drone technology, drones have been widely used in production and life, such as the erection of power lines, cargo transportation, and environmental detection. Relying on its lightness and low price, drones have entered all walks of life. Due to the high temperature of asphalt mixture paving, it is usually difficult for general equipment to capture infrared asphalt images at a better angle. In this regard, an infrared imaging device set up by a drone to collect images in the air can economically and safely obtain images that are easy to process . [0003] At present, infrared thermal imaging detection technology is widely used in the construction of asphalt pavement. In th...

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Problems solved by technology

Although bilateral filtering has the above advantages, it has the disadvantages of low efficiency and poor filtering effect. In order to improve the filtering effect, the mask radius should be large enough. However, when the mask radius is too large, the calculation time is unacceptable. , so bilateral filtering is difficult to achieve real-time processing, which does not meet the application of some occasions

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