CN109213891A - A method of using average hash algorithm search pictures - Google Patents
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- CN109213891A CN109213891A CN201810951421.0A CN201810951421A CN109213891A CN 109213891 A CN109213891 A CN 109213891A CN 201810951421 A CN201810951421 A CN 201810951421A CN 109213891 A CN109213891 A CN 109213891A
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Abstract
The invention discloses a kind of methods using average hash algorithm search pictures, belong to field of computer technology, step are as follows: user selects a picture to scan for, picture is narrowed down to the size of 8x8, 64 pixels in total, remove the details of picture, only retain structure, the essential informations such as light and shade, abandon different sizes, ratio bring picture difference, the small picture of 8*8 is converted into gray scale picture, the color of 64 pixels is converted into a kind of color, by original RGB (R, G, B the R in), G, B is unified to be replaced with Gray, form new color RGB (Gray, Gray, Gray), original RGB (R is replaced with it, G, it B) is grayscale image, calculate the average gray of all 64 pixels, the gray scale of compared pixels, by the ash of each pixel Degree, is compared with average value, calculates cryptographic Hash and combines the comparison result of previous step, just constitutes one 64 integers, and the present invention is realized to scheme to search figure, can search original image by thumbnail, can be applied to internet, medically.
Description
Technical field
The present invention relates to field of computer technology, in particular to a kind of side using average hash algorithm search pictures
Method.
Background technique
With the continuous development of Internet technology, internet provides needs of the various search to meet people for people.
People not only need to scan for text information, but also are also required to carry out searching for picture or local similar pictures on the internet
Rope, but due to the particularity of picture searching, it is a worldwide insoluble skill according to image content search pictures
Art problem.
Average hash algorithm, its effect are to generate " fingerprint " character string to every picture, then more different figures
The fingerprint of piece.Comparison result is closer, just illustrates that picture is more similar, it is desirable that the content of picture cannot change, if on picture
Adding several texts, it cannot be searched out.
Summary of the invention
Invention is designed to provide a kind of method using average hash algorithm search pictures, to scheme to search figure, Ke Yitong
It crosses thumbnail and searches original image, can be applied to internet, medically, to solve the problems mentioned in the above background technology.
To achieve the above object, the invention provides the following technical scheme:
A method of using average hash algorithm search pictures, include the following steps:
Step 1: user selects a picture to scan for；
Step 2: picture is narrowed down to the size of 8x8, in total 64 pixels by minification；
Step 3: simplifying picture color, the small picture of 8*8 be converted into gray scale picture, and the color of 64 pixels is converted
At a kind of color；
Step 4: calculating pixel average, calculates the average gray of all 64 pixels；
Step 5: the gray scale of each pixel is compared by the gray scale of compared pixels with average value, is greater than or equal to flat
Mean value is denoted as 1；Less than average value, it is denoted as 0；
Step 6: it calculates cryptographic Hash and combines the comparison result of previous step, constitute one 64 integers, root
Picture fingerprint is generated according to the average gray of each pixel；
Step 7: according to picture fingerprint to data base querying；
Step 8: output query result.
Further, picture is converted to gray scale picture in step 3 can be used floating-point arithmetic: Gray=R*0.3+G*
0.59+B*0.11 or integer method: Gray=(R*30+G*59+B*11)/100 or displacement method: Gray=(R*76+G*151+
B*28) > > 8 or mean value method: Gray=(R+G+B)/3 only takes green: one of Gray=G.
Further, after Gray is acquired by any method, by the R in original RGB (R, G, B), G, B uniformly use Gray
Replacement, forms new color RGB (Gray, Gray, Gray), replacing original RGB (R, G, B) with it is grayscale image.
Further, the color of 64 pixels is red, green, blue in step 3, and the color being converted into is black-white-gray
Degree.
Compared with prior art, the beneficial effects of the present invention are: the present invention changes traditional picture searching mode, by picture
The size of 8x8 is narrowed down to, in total 64 pixels, remove the details of picture, only retained the essential informations such as structure, light and shade, abandon not
Same size, ratio bring picture difference, are converted into gray scale picture for the small picture of 8*8, the color of 64 pixels are converted into
A kind of color, by the R in original RGB (R, G, B), G, B are unified to be replaced with Gray, formed new color RGB (Gray, Gray,
Gray), replacing original RGB (R, G, B) with it is grayscale image, calculates the average gray of all 64 pixels, compares
The gray scale of each pixel is compared by the gray scale of pixel with average value, cryptographic Hash is calculated, by the comparison result of previous step, group
It is combined, just constitutes one 64 integers, realize to scheme to search figure, original image can be searched by thumbnail, can answered
For internet, medically.
Detailed description of the invention
Fig. 1 is picture query process flow diagram of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, a kind of method using average hash algorithm search pictures, includes the following steps:
Step 1: user selects a picture to scan for, and is scanned for based on this picture；
Step 2: picture is narrowed down to the size of 8x8, in total 64 pixels by minification；The effect of this step is removal
The details of picture only retains the essential informations such as structure, light and shade, abandons different sizes, ratio bring picture difference；
Step 3: simplifying picture color, the small picture of 8*8 be converted into gray scale picture, by the colors of 64 pixels (red,
Green, blue) it is converted into a kind of color (black and white gray scale)；Convenient for subsequent calculating average gray；
Picture complete for a width is made of red, green, blue three channels.Red, green, blue three logical
Figure is look in the contracting in road to be shown with gray scale.The specific gravity of " red, green, blue " in picture is indicated with different gray scales.Channel
In it is pure white, represent the coloured light here it is maximum brightness, gray scale is 255, and picture, which is converted to gray scale picture, to be adopted
With the following method:
Using floating-point arithmetic: Gray=R*0.3+G*0.59+B*0.11；
Integer method: Gray=(R*30+G*59+B*11)/100；
Displacement method: Gray=(R*76+G*151+B*28) > > 8；
Mean value method: Gray=(R+G+B)/3
Only take green: Gray=G.
After acquiring Gray by any of the above-described kind of method, by the R in original RGB (R, G, B), G, B are unified to be replaced with Gray
It changes, forms new color RGB (Gray, Gray, Gray), replacing original RGB (R, G, B) with it is grayscale image.
Step 4: calculating pixel average, calculates the average gray of all 64 pixels；
Step 5: the gray scale of each pixel is compared by the gray scale of compared pixels with average value, is greater than or equal to flat
Mean value is denoted as 1；Less than average value, it is denoted as 0；Convenient for the combination of next step；
Step 6: it calculates cryptographic Hash and combines the comparison result of previous step, constitute one 64 integers, root
Picture fingerprint is generated according to the average gray of each pixel；
Step 7: according to picture fingerprint to data base querying；
Step 8: output query result can search original image by thumbnail.
The present invention is by taking iOS platform picture searching App as an example:
1) user opens picture searching App and takes pictures or upload thumbnail；
2) user opens picture searching App and takes pictures or upload thumbnail；
3) App calculates the average gray of all 64 pixels using the method for calculating pixel grey scale average value；
4) App marks 64 pixels according to the pixel grey scale average value calculated respectively；
5) App calculates picture cryptographic Hash according to the label of each pixel, saves as picture fingerprint；
6) App provides the fingerprint of the picture to server, and server is inquired in the database；
7) App shows search result to user.
In conclusion the method proposed by the present invention using average hash algorithm search pictures, the present invention changes traditional
Picture is narrowed down to the size of 8x8 by picture searching mode, in total 64 pixels, removes the details of picture, only retains structure, bright
The essential informations such as dark, abandon different sizes, ratio bring picture difference, the small picture of 8*8 are converted into gray scale picture, by 64
The color of a pixel is converted into a kind of color, and by the R in original RGB (R, G, B), G, B are unified to be replaced with Gray, is formed new
Color RGB (Gray, Gray, Gray), replacing original RGB (R, G, B) with it is grayscale image, calculates all 64 pixels
Average gray, the gray scale of compared pixels.By the gray scale of each pixel, it is compared with average value.More than or equal to average
Value, is denoted as 1；Less than average value, it is denoted as 0, calculates cryptographic Hash.It by the comparison result of previous step, combines, just constitutes one
A 64 integers are realized to scheme to search figure, can search original image by thumbnail, can be applied to internet, medically.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (4)
1. a kind of method using average hash algorithm search pictures, which comprises the steps of:
Step 1: user selects a picture to scan for；
Step 2: picture is narrowed down to the size of 8x8, in total 64 pixels by minification；
Step 3: simplify picture color, the small picture of 8*8 is converted into gray scale picture, the color of 64 pixels is converted into one
Kind color；
Step 4: calculating pixel average, calculates the average gray of all 64 pixels；
Step 5: the gray scale of each pixel is compared by the gray scale of compared pixels with average value, is greater than or equal to average value,
It is denoted as 1；Less than average value, it is denoted as 0；
Step 6: it calculates cryptographic Hash and combines the comparison result of previous step, one 64 integers are constituted, according to every
The average gray of a pixel generates picture fingerprint；
Step 7: according to picture fingerprint to data base querying；
Step 8: output query result.
2. a kind of method using average hash algorithm search pictures according to claim 1, which is characterized in that step 3
It is middle picture to be converted into gray scale picture floating-point arithmetic can be used: Gray=R*0.3+G*0.59+B*0.11 or integer method: Gray
=(R*30+G*59+B*11)/100 or displacement method: Gray=(R*76+G*151+B*28) > > 8 or mean value method: Gray
=(R+G+B)/3 only takes green: one of Gray=G.
3. a kind of method using average hash algorithm search pictures according to claim 2, which is characterized in that Gray by
After any method acquires, by the R in original RGB (R, G, B), G, B are unified to be replaced with Gray, forms new color RGB
(Gray, Gray, Gray), replacing original RGB (R, G, B) with it is grayscale image.
4. a kind of method using average hash algorithm search pictures according to claim 1, which is characterized in that step 3
In 64 pixels color be red, green, blue, the color being converted into be black and white gray scale.
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| CN110175559A (en) * | 2019-05-24 | 2019-08-27 | 北京博视未来科技有限公司 | A kind of independent judgment method of the video frame for intelligent recognition |
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| CN112131956A (en) * | 2020-08-27 | 2020-12-25 | 国网湖北省电力有限公司电力科学研究院 | Voltage sag source classification method based on difference hash algorithm |
| CN112308162A (en) * | 2020-11-06 | 2021-02-02 | 上海软中信息技术有限公司 | Image big data similarity comparison method and system |
| CN113486972A (en) * | 2021-07-19 | 2021-10-08 | 筑盟(上海)数字科技有限公司 | System and method for BIM model copyright authentication |
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