Jpeg compression quantification method suitable for aerial images

Abstract

The invention discloses a jpeg compression quantification method suitable for aerial images. The jpeg compression quantification method comprises the following steps: step 1, carrying out image preprocessing; step 2, carrying out DCT transformation; step 3, carrying out quantification processing; step 4, carrying out Huffman coding; wherein in the step 1, aerial images are subjected to sexual preprocessing; wherein in the step 2, DCT transformation is carried out on a Y channel, a Cb channel and a Cr channel of a preprocessing result image in the step 1. A jpeg compression quantification method is used for aerial image compression processing. On the premise of ensuring that the pictures before and after compression have almost no difference, the jpeg compression quantization processing process is adopted. The data size of the aerial photo is greatly reduced, later storage is facilitated, a new quantization table is applied in the jpeg compression quantization processing process, and the problems that the compressed image block effect is particularly prominent, the image distortion is serious and the method is not suitable for aerial photo application of the unmanned aerial vehicleafter processing is completed by using the standard recommended quantization table are solved.

Description

technical field [0001] The invention relates to the technical field of image processing methods, in particular to a jpeg compression and quantization method suitable for aerial images. Background technique [0002] Aerial photography, also known as aerial photography, aerial photography or aerial photography, refers to taking pictures of the earth's landforms from the air and obtaining a top view. Platforms include airplanes, helicopters, hot air balloons, small spaceships, rockets, kites, parachutes, etc.; in order to stabilize aerial photos, sometimes advanced photography equipment such as Spacecam is used. There are more and more cameras, and the resolution of images is getting higher and higher, which makes the existing aerial photography data huge, which is not conducive to later storage; among them, JPEG has an extremely wide application in the field of static image compression, which can ensure that the images are In the case of less detail loss, a higher image compr...

AI Technical Summary

Problems solved by technology

[0002] Aerial photography, also known as aerial photography, aerial photography or aerial photography, refers to taking pictures of the earth's landforms from the air and obtaining a top view. Platforms include airplanes, helicopters, hot air balloons, small spaceships, rockets, kites, parachutes, etc.; in order to stabilize aerial photos, sometimes advanced photography equipment such as Spacecam is used. There are more and more cameras, and the resolution of images is getting higher and higher, which makes the existing aerial photography data huge, which is not conducive to later storage; among them, JPEG has an extremely wide application in the field of static image compression, which can ensure that the images are In the case of less detail loss, a higher image compression ratio can be achieved; after BMP images are compressed by JPEG, the amount of data obtained can be as low as one-seventh of the original image or even smaller, and there is almost no difference between the images before and after compression, but now There is no good application of JPEG in aerial image compression in the market, and the problem of reducing the amount of data cannot be achieved well. Among them, the existing jpeg compression and quantization process uses the standard recommended quantization table, and the compressed image after processing The block effect is particularly prominent, and the picture is seriously distorted. Obviously, this quantization table is not suitable for our application

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