Image composition method based on high-dynamic range principle, device and mobile terminal

Abstract

The invention discloses an image composition method based on high-dynamic range principle, a device and a mobile terminal. The method comprises the following steps: acquiring multiple images with different exposure parameters; performing composition on multiple images with different exposure parameters based on the high-dynamic range principle to acquire a high-dynamic range image; performing tone mapping on the high-dynamic range image so as to enable the pixel of the high-dynamic range image to perform the recompression; the device comprises an image acquisition module, an image composition module and a tone mapping module; the mobile terminal comprises a processor and a storage for storing executable programs of the processor; when the processor executes the program stored in the storage, the operation of the above-mentioned method is realized. The high-dynamic range image is obtained by performing the composition on multiple images with different exposure parameters, and the tone mapping is performed, the image internal details are improved, and the image border details are reserved.

Description

technical field [0001] The invention relates to an image synthesis method, in particular to an image synthesis method, device and mobile terminal based on the principle of high dynamic range, belonging to the field of image processing. Background technique [0002] With the popularization of certificates, information such as Hong Kong and Macau travel permits, Taiwan travel permits, passports, and ID cards all require verification of personal information. The applicant needs to take a new photo of the certificate that meets the requirements of the certificate every time the certificate is issued. [0003] With the popularization of mobile phone shooting, its shooting function is becoming more and more powerful, but there are still the following problems: [0004] 1) Due to the different shooting environments or the reflection of the surface of the object to be photographed, the overall illumination of the shot is uneven, which makes it difficult for the system to extract th...

AI Technical Summary

Problems solved by technology

[0004] 1) Due to the different shooting environments or the reflection of the surface of the object to be photographed, the overall illumination of the shot is uneven, which makes it difficult for the system to extract the detailed information when the photo processing system reads the information;

[0005] 2) In the process of reading the image of the person, the light problem during shooting will cause a lot of noise in the image after shooting, which will cause the color channel of the image to shift. Then the system will appear when reading the information of the face or the background area. error;

[0006] 3) It is difficult to ensure the stability of the light. It is necessary to process the photos taken by the system to separate the external environment from the character graphics, and at the same time separate the detailed information of the characters, but this processing method is more troublesome

[0007] Therefore, the details of the photos taken by mobile phones cannot be completely separated during subsequent image processing, and the photos taken with the assistance of other people are also difficult to meet the requirements for certification; Shooting is expensive, and the shooting effect is not good. When you are not satisfied with the shooting effect and want to retake it, you need to re-communicate and discuss with the photographer, which is time-consuming and laborious.

[0008] For High-Dynamic Range (HDR) images, two levels of long and short exposure are usually used to achieve the effect, but the effect is not ideal, especially in scenes where bright and dark scenes are mixed, and the transition effect between bright places and dark places is not good. it is good

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