CN107463926B - Method for acquiring and processing video in artistic examination performance process - Google Patents
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Abstract
The invention discloses a method for acquiring and processing videos in an artistic examination performance process, which specifically comprises the following steps: determining camera parameters and a standing position; sampling and shooting an artistic examination video; acquiring image characteristics of a sampled video; shooting a performance process video of an examinee in a formal examination; and generating a review video. The method comprises the steps that a plurality of simulated examinees are selected to take an artistic examination and a video of the examination process is recorded, so that the image characteristics and the position characteristics of the examination exams held by the examinees in hand in the video are obtained, and basic data are provided for automatically generating the video of the examination process of the artistic examinees without examination exam information in the later period; based on the position characteristics of the admission card in the video image in the artistic examinee examination process video obtained by sampling, only image blocks at corresponding positions in the examinee official examination process video are intercepted for similarity comparison, instead of the whole image, so that the image comparison efficiency is greatly improved.
Description
Technical Field
The invention relates to the technical field of video processing, in particular to a method for acquiring and processing videos in an artistic examination performance process.
Background
Admission of art examinees is an important component of the admission of colleges and universities. The current general process of enrollment and admission of art examinees in colleges and universities in our country is as follows: the examinee reports the name according to the enrollment plan of colleges and universities, then the education management department or the enrollment school organizes and arranges the examination, the examination is graded after the examination is finished, and finally the enrollment plan and the score of the examinee are combined to generate an admission list.
In the process of admission of art examinee recruiting, the evaluation of the examination score is one of important links, and for music and dance examinees, the existing evaluation method of the examination score is as follows: when an examinee takes an examination organized by an examination organization unit, a student administrator or invigilator records process videos of performance items of the examinee on site, acquires the examination process videos of all artistic examinees, organizes the examinees again, focuses on a room to uniformly watch the examination process videos of the examinees, scores examination performances of the examinees one by one, summarizes the scores of the multiple examinees, and calculates examination scores of the examinees according to a certain rule to serve as final scores. In this scoring method, the video of the examination process of the examinee is important, and is equivalent to the paper examination paper. Therefore, in order to facilitate later-stage checking and avoid confusion, generally, when an examinee takes a video of an examinee's process, the examinee normally starts an artistic performance item, and stands for 3-5 seconds with his own examination admission certificate facing the lens with both hands, so that a picture of the examinee's own examination certificate in front of the finally obtained video of the examination process exists.
The main problem of the above art examinee examination scoring mode is that in the scoring stage when a centralized appraiser watches an examination video, the appraiser cannot see the picture of an examinee handheld admission card in the video, so that the appraiser cannot see the information of the examinee such as the real name, the identity card number and the like to influence the scoring fairness. For this reason, in the current main practice, when the examination process video of each examinee is played, a manager is arranged to manually skip the video from the place where the examinee holds the admission card to start playing, so that the examinee's admission card cannot be seen by the reviewer. This method of manually setting the video start play position one by a human is certainly very inefficient. Although the efficiency can be improved by automatically forcing the examination video of each examinee to start playing from a specific place by presetting a playing starting time. For example, the video can be set to be played uniformly from the 10 th second of the video, but because the actions of different examinees are different, the pictures of all the examinees holding the admission certificates in the actually recorded examination video of the artistic examinees do not appear only in the first 10 seconds of the video. Therefore, the method for budgeting the fixed starting playing time has a great limitation, and cannot avoid the problem that the commentator sees the admission card of the examinee from the video.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a video acquisition and processing method in the process of artistic examination performance.
The technical scheme for realizing the purpose of the invention is as follows:
a method for acquiring and processing videos in the process of artistic examination performance specifically comprises the following steps:
s1, determining camera parameters and a standing position:
according to the requirement of evaluating the performance of the examinees in the art enrollment examinations and the characteristics of the examination room, the shooting parameters of the camera when the videos of the examination performance process of the examinees are recorded are set, and the positions of the examinees, holding the examination admission cards in the examination room and facing the camera to stand, can be determined by drawing circles or drawing lines on the ground of the examination room;
s2, sampling and shooting artistic examination videos:
selecting a plurality of individuals, simulating the process of taking an examination in an art examination room, and shooting the video of the simulated examination process of each individual to obtain a sampling video;
s3, acquiring image characteristics of the sampled video:
analyzing the sampled video obtained in the step 2) to obtain the characteristics of the admission ticket on the image in the sampled video;
s4, shooting a video of the performance process of the examinee during the formal examination:
recording video according to the parameters of the camera determined in the step 1), and requiring each examinee to stand for 3-5 seconds in a manner that the examinee holds the own examination certificate at a designated position and faces the camera at the present of formal performance art items, so that the recorded front part of the examination process video of the examinee contains a picture of the examination certificate held by the examinee, and meanwhile, the identification number of the examinee is used as the file name of the examination process video of the examinee;
s5, generating a review video:
processing the examination process video of each examinee obtained in the step 4) according to the image characteristics of the sampling video obtained in the step 3), removing image frames containing examination admission card pictures in the video, and forming a new video without admission card information for later grade grading;
through the steps, the review video without the examination admission information is obtained.
In step S2, the specific operation procedure is: selecting 10-20 individuals, and making an admission card for each individual by taking the admission card style of the art admission examination in the current year of the admission institution as a standard; after a camera is installed in an art examination room, according to the shooting parameters determined in the step 1), the video of each person simulating the process of performing the art examination is shot one by one, and the process comprises the process that an examinee holds an examination admission card face at the appointed position of the examination room and stands for 3-5 seconds relative to the camera, and the process of performing an art interface.
The step S3 specifically includes the following steps:
s3-1: for each sampling video obtained in the step S2, 1 image of a picture with a test taker holding the admission card is intercepted to form a sampling image library PD;
s3-2: for each image PDi (i is more than or equal to 10 and less than or equal to 20) in the sampling image library PD, obtaining four edge point coordinates of the admission certificate in the whole image in the image PDi, wherein the four edge point coordinates are respectively a leftmost point p1, a highest point p2, a lowest point p3 and a rightmost point p 4; note that the X-axis pixel point coordinate of p1 in the image is Xmin_iAnd the coordinate of the Y-axis pixel point of the p2 in the image is Ymin_iAnd the coordinate of the Y-axis pixel point of the p3 in the image is Ymax_iAnd the Y-axis pixel point coordinate of p2 in the image is xmax_i(ii) a A rectangular image with v1, v2, v3 and v4 as four vertex coordinates is intercepted from the image PDi and is stored in a sampling image feature library PS; wherein the coordinate of v1 is (x)min_i，ymin_i) And v2 has the coordinate (x)max_i，ymin_i) And v3 has the coordinate (x)max_i，ymax_i) And v4 has the coordinate (x)min_i，ymax_i）；
S3-3: carrying out graying and median filtering processing on each image PSi in the PS, and replacing the original image PSi with the obtained image;
s3-4: superposing and averaging all images in the PS to generate an examination-proof characteristic image UP, namely superposing gray values of pixel points of the same coordinates of all images in the PS and taking an average value as the gray value of the pixel point of the coordinate in the image UP;
s3-5: for the x-axis coordinate x of the leftmost point in each sample image PDi obtained in step S3-2min_iFinding out the minimum value of these coordinate points and recording as xmin_h(ii) a Similarly, the y-axis coordinate y of the highest point in each image PDi obtained in step S3-2 is foundmin_iAnd is noted as ymin_h(ii) a Finding the y-axis coordinate y of the lowest point in each image PDi obtained in step S3-2max_iAnd is noted as ymax_h(ii) a Finding the x-axis coordinate x of the rightmost point in each image PDi obtained in step S3-2max_iAnd is noted as xmax_h；
S3-6: forming possible regions of the testimonials in the video image, namely rectangular regions with the coordinates of four vertexes u1, u2, u3 and u 4; wherein the coordinate of u1 is (x)min_h，ymin_h) The coordinate of u2 is (x)max_h，ymin_h) The coordinate of u3 is (x)max_h，ymax_h) The coordinate of u4 is (x)min_h，ymax_h）。
The step S5 specifically includes the following steps:
s5-1: for each frame of image in the video obtained in the step S4, capturing rectangular image blocks with u1, u2, u3 and u4 as four vertexes in the image, performing graying and median filtering on the image blocks, comparing the obtained result image with the quasi-proof feature image UP obtained in the step S3-4, and adding a deletion mark to the frame of image if the similarity between the two reaches the degree preset by the user;
s5-2: for each video processed in step S5-1, the position of the last frame image with the deletion marker in the video is checked, the next frame of the frame image is taken as the starting point, the video between the point in the video and the video ending point is intercepted to form a new video, i.e., the video for later scoring, and the file name of the original video, i.e., the identity card number of the examinee, plus the character "ps" is taken as the file name of the new video.
Has the advantages that: through formulating unified camera parameter to and the position of standing of the handheld admission card of examinee for the camera, make in the video that the camera acquireed, the difference of the image characteristic of admission card in the video and position is less relatively, and the later stage of being convenient for carries out the image contrast.
When the video of the examinee formal examination is checked whether a handheld admission card standing picture exists or not, only a small part of image blocks are intercepted for feature comparison, but not the whole image, so that the method is ensured to have higher image comparison speed.
Through the mode of image recognition, the image frames containing the images of the examination admission certificates held by the examinees in the video are automatically found, the new examination process video which does not contain the images of the examination admission certificates held by the examinees is generated and is distributed to the reviewers for grading in the later period, and good technical support is provided for fair justice of grading of the artistic enrollment examinations of colleges and universities.
Drawings
FIG. 1 is a flow chart of a method for acquiring and processing videos during an artistic examination performance of the present invention;
reference numeral 2 denotes an image of an examinee holding an admission card in his/her hand in a video taken by the examinee taking an artistic examination as [ T1], and a schematic diagram of coordinates of four edge points of the admission card in the image is obtained.
Detailed Description
The invention is further illustrated but not limited by the following figures and examples.
Example (b):
as shown in fig. 1, a method for acquiring and processing a video in an artistic examination performance process specifically includes the following steps:
s1, determining camera parameters and a standing position:
according to the requirement of evaluating the performance of the examinees in the art enrollment examinations and the characteristics of the examination room, the shooting parameters of the camera when the videos of the examination performance process of the examinees are recorded are set, and the positions of the examinees, holding the examination admission cards in the examination room and facing the camera to stand, can be determined by drawing circles or drawing lines on the ground of the examination room;
s2, sampling and shooting artistic examination videos:
selecting a plurality of individuals, simulating the process of taking an examination in an art examination room, shooting the video of the simulated examination process of each individual to obtain a sampling video, wherein the specific operation process is as follows: selecting 10-20 individuals, and making an admission card for each individual by taking the admission card style of the art admission examination in the current year of the admission institution as a standard; after a camera is installed in an art examination room, according to the shooting parameters determined in the step 1), the video of each person simulating the process of performing the art examination is shot one by one, and the process comprises the process that an examinee holds an examination admission card face at the appointed position of the examination room and stands for 3-5 seconds relative to the camera, and the process of performing an art interface.
S3, acquiring image characteristics of the sampled video:
analyzing the sample video obtained in step 2) to obtain the characteristics of the admission ticket on the image in the sample video, which is specifically shown in fig. 2:
s3-1: for each sampling video obtained in the step S2, 1 image of a picture with a test taker holding the admission card is intercepted to form a sampling image library PD;
s3-2: for each image PDi (i is more than or equal to 10 and less than or equal to 20) in the sampling image library PD, obtaining four edge point coordinates of the admission certificate in the whole image in the image PDi, wherein the four edge point coordinates are respectively a leftmost point p1, a highest point p2, a lowest point p3 and a rightmost point p 4; note that the X-axis pixel point coordinate of p1 in the image is Xmin_iAnd the coordinate of the Y-axis pixel point of the p2 in the image is Ymin_iAnd the coordinate of the Y-axis pixel point of the p3 in the image is Ymax_iAnd the Y-axis pixel point coordinate of p2 in the image is xmax_i(ii) a A rectangular image with v1, v2, v3 and v4 as four vertex coordinates is intercepted from the image PDi and is stored in a sampling image feature library PS; wherein the coordinate of v1 is (x)min_i，ymin_i) And v2 has the coordinate (x)max_i，ymin_i) And v3 has the coordinate (x)max_i，ymax_i) And v4 has the coordinate (x)min_i，ymax_i）；
S3-3: carrying out graying and median filtering processing on each image PSi in the PS, and replacing the original image PSi with the obtained image;
s3-4: superposing and averaging all images in the PS to generate an examination-proof characteristic image UP, namely superposing gray values of pixel points of the same coordinates of all images in the PS and taking an average value as the gray value of the pixel point of the coordinate in the image UP;
s3-5: for the x-axis coordinate x of the leftmost point in each sample image PDi obtained in step S3-2min_iFinding out the minimum value of these coordinate points and recording as xmin_h(ii) a Similarly, the y-axis coordinate y of the highest point in each image PDi obtained in step S3-2 is foundmin_iAnd is noted as ymin_h(ii) a Finding the y-axis coordinate y of the lowest point in each image PDi obtained in step S3-2max_iAnd is noted as ymax_h(ii) a Finding the x-axis coordinate x of the rightmost point in each image PDi obtained in step S3-2max_iAnd is noted as xmax_h；
S3-6: forming possible regions of the testimonials in the video image, namely rectangular regions with the coordinates of four vertexes u1, u2, u3 and u 4; wherein the coordinate of u1 is (x)min_h，ymin_h) The coordinate of u2 is (x)max_h，ymin_h) The coordinate of u3 is (x)max_h，ymax_h) The coordinate of u4 is (x)min_h，ymax_h）。
S4, shooting a video of the performance process of the examinee during the formal examination:
recording according to the parameters of the camera determined in the step 1), and requiring each examinee to stand for 3-5 seconds at the present of formal performance art items by holding the examinee's own admission card at a specified position and facing the camera, so that the recorded front part of the examinee's examination process video comprises a picture of the examinee's handheld admission card, and meanwhile, the number of the examinee's identity card is used as the file name of the examinee's examination process video.
S5, generating a review video:
processing the examination process video of each examinee obtained in the step 4) according to the image characteristics of the sampling video obtained in the step 3), removing image frames containing examination admission card pictures in the video, and forming a new video without admission card information for later grade grading; the method specifically comprises the following steps:
s5-1: for each frame of image in the video obtained in the step S4, capturing rectangular image blocks with u1, u2, u3 and u4 as four vertexes in the image, performing graying and median filtering on the image blocks, comparing the obtained result image with the quasi-proof feature image UP obtained in the step S3-4, and adding a deletion mark to the frame of image if the similarity between the two reaches the degree preset by the user;
s5-2: for each video processed in step S5-1, the position of the last frame image with the deletion marker in the video is checked, the next frame of the frame image is taken as the starting point, the video between the point in the video and the video ending point is intercepted to form a new video, i.e., the video for later scoring, and the file name of the original video, i.e., the identity card number of the examinee, plus the character "ps" is taken as the file name of the new video.
Through the steps, the review video without the examination admission information is obtained.
Claims (4)
1. A video acquisition and processing method in the process of artistic examination performance is characterized by comprising the following steps:
s1, determining camera parameters and a standing position:
according to the requirement of evaluating the performance of the examinees in the art enrollment examinations and the characteristics of the examination room, the shooting parameters of the camera when the video of the examination performance process of the examinees is recorded are formulated, and the positions of the examinees, holding the examination admission cards in the examination room and facing the camera to stand, are determined by drawing circles or drawing lines on the ground of the examination room;
s2, sampling and shooting artistic examination videos:
selecting a plurality of individuals, simulating the process of taking an examination in an art examination room, and shooting the video of the simulated examination process of each individual to obtain a sampling video;
s3, acquiring image characteristics of the sampled video:
analyzing the sampled video obtained in the step 2) to obtain the characteristics of the admission ticket on the image in the sampled video;
s4, shooting a video of the performance process of the examinee during the formal examination:
recording video according to the parameters of the camera determined in the step 1), and requiring each examinee to stand for 3-5 seconds in a manner that the examinee holds the own examination certificate at a designated position and faces the camera at the present of formal performance art items, so that the recorded front part of the examination process video of the examinee contains a picture of the examination certificate held by the examinee, and meanwhile, the identification number of the examinee is used as the file name of the examination process video of the examinee;
s5, generating a review video:
processing the examination process video of each examinee obtained in the step 4) according to the image characteristics of the sampling video obtained in the step 3), removing image frames containing examination admission card pictures in the video, and forming a new video without admission card information for later grade grading;
through the steps, the review video without the examination admission information is obtained.
2. The method for acquiring and processing the video in the process of the artistic examination performance as claimed in claim 1, wherein in the step S2, the specific operation process is as follows: selecting 10-20 individuals, and making an admission card for each individual by taking the admission card style of the art admission examination in the current year of the admission institution as a standard; after a camera is installed in an art examination room, according to the shooting parameters determined in the step 1), the video of each person simulating the process of performing the art examination is shot one by one, and the process comprises the process that an examinee holds an examination admission card face at the appointed position of the examination room and stands for 3-5 seconds relative to the camera, and the process of performing an art interface.
3. The method for acquiring and processing the video in the process of the artistic examination performance as claimed in claim 1, wherein the step S3 specifically comprises the following steps:
s3-1: for each sampling video obtained in the step S2, 1 image of a picture with a test taker holding the admission card is intercepted to form a sampling image library PD;
s3-2: for each image PDi (i is more than or equal to 10 and less than or equal to 20) in the sampling image library PD, obtaining four edge point coordinates of the admission certificate in the whole image in the image PDi, wherein the four edge point coordinates are respectively a leftmost point p1, a highest point p2, a lowest point p3 and a rightmost point p 4; note that the X-axis pixel point coordinate of p1 in the image is Xmin_iAnd the coordinate of the Y-axis pixel point of the p2 in the image is Ymin_iAnd the coordinate of the Y-axis pixel point of the p3 in the image is Ymax_iAnd the Y-axis pixel point coordinate of p2 in the image is xmax_i(ii) a A rectangular image with v1, v2, v3 and v4 as four vertex coordinates is intercepted from the image PDi and is stored in a sampling image feature library PS; wherein the coordinate of v1 is (x)min_i，ymin_i) And v2 has the coordinate (x)max_i，ymin_i) And v3 has the coordinate (x)max_i，ymax_i) And v4 has the coordinate (x)min_i，ymax_i）；
S3-3: carrying out graying and median filtering processing on each image PSi in the PS, and replacing the original image PSi with the obtained image;
s3-4: superposing and averaging all images in the PS to generate an examination-proof characteristic image UP, namely superposing gray values of pixel points of the same coordinates of all images in the PS and taking an average value as the gray value of the pixel point of the coordinate in the image UP;
s3-5: for the x-axis coordinate x of the leftmost point in each sample image PDi obtained in step S3-2min_iFinding out the minimum value of these coordinate points and recording as xmin_h(ii) a Similarly, the y-axis coordinate y of the highest point in each image PDi obtained in step S3-2 is foundmin_iAnd is noted as ymin_h(ii) a Finding the y-axis coordinate y of the lowest point in each image PDi obtained in step S3-2max_iAnd is noted as ymax_h(ii) a Finding the x-axis coordinate x of the rightmost point in each image PDi obtained in step S3-2max_iAnd is noted as xmax_h；
S3-6: forming possible regions of the testimonials in the video image, namely rectangular regions with the coordinates of four vertexes u1, u2, u3 and u 4; wherein the coordinates of u1 are（xmin_h，ymin_h) The coordinate of u2 is (x)max_h，ymin_h) The coordinate of u3 is (x)max_h，ymax_h) The coordinate of u4 is (x)min_h，ymax_h）。
4. The method for acquiring and processing the video in the process of the artistic examination performance as claimed in claim 1, wherein the step S5 specifically comprises the following steps:
s5-1: for each frame of image in the video obtained in the step S4, capturing rectangular image blocks with u1, u2, u3 and u4 as four vertexes in the image, performing graying and median filtering on the image blocks, comparing the obtained result image with the quasi-proof feature image UP obtained in the step S3-4, and adding a deletion mark to the frame of image if the similarity between the two reaches the degree preset by the user;
s5-2: for each video processed in step S5-1, the position of the last frame image with the deletion marker in the video is checked, the next frame of the frame image is taken as the starting point, the video between the point in the video and the video ending point is intercepted to form a new video, i.e., the video for later scoring, and the file name of the original video, i.e., the identity card number of the examinee, plus the character "ps" is taken as the file name of the new video.
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| CN105472455A (en) * | 2014-09-12 | 2016-04-06 | 扬智科技股份有限公司 | Specific video content detecting and deleting methods |
| CN105574467A (en) * | 2014-10-09 | 2016-05-11 | 多媒体影像解决方案有限公司 | Method for protecting privacy of camera video via human identity recognition |
| CN104504321A (en) * | 2015-01-05 | 2015-04-08 | 湖北微模式科技发展有限公司 | Method and system for authenticating remote user based on camera |
| CN105992060A (en) * | 2015-02-13 | 2016-10-05 | 中兴通讯股份有限公司 | Method, device and system for filtering video ad |
| CN106803943A (en) * | 2016-03-31 | 2017-06-06 | 小蚁科技（香港）有限公司 | Video monitoring system and equipment |
| CN106022330A (en) * | 2016-05-20 | 2016-10-12 | 广东海辰科技股份有限公司 | Information collection method and terminal of identity document |
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