• Laser & Optoelectronics Progress
  • Vol. 57, Issue 4, 041009 (2020)
Kaixuan Wang, Zhuorong Li, Xiaobin Wang, Shengdong Yan, and Yunqi Tang*
Author Affiliations
  • School of Criminal Investigation and Forensic Science, People's Public Security University of China, Beijing 100038, China
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    DOI: 10.3788/LOP57.041009 Cite this Article Set citation alerts
    Kaixuan Wang, Zhuorong Li, Xiaobin Wang, Shengdong Yan, Yunqi Tang. Automated Classification Method for Crime Scene Sketches[J]. Laser & Optoelectronics Progress, 2020, 57(4): 041009 Copy Citation Text show less
    Specification of crime scene sketches. (a) Crime scene overview sketch; (b) self-drawn location sketch; (c) map-screenshot location sketch
    Fig. 1. Specification of crime scene sketches. (a) Crime scene overview sketch; (b) self-drawn location sketch; (c) map-screenshot location sketch
    Diagram of XCTNet structure
    Fig. 2. Diagram of XCTNet structure
    Structure of Inception
    Fig. 3. Structure of Inception
    Accuracy and ROC curves. (a) Comparison of accuracies of different network structures; (b) ROC curves
    Fig. 4. Accuracy and ROC curves. (a) Comparison of accuracies of different network structures; (b) ROC curves
    Misclassification pictures
    Fig. 5. Misclassification pictures
    Structureconv1_1conv2_1conv2_2conv3_1conv3_2conv4_2Output
    Inception1a6496128163232256
    Inception1b128128192329664480
    Inception2a25616032032128128832
    Inception2b384192384481281281024
    Table 1. Composition parameters of Inception
    Training datasetValidation datasetTest dataset
    Crime dataset scene overview sketch1710121382137
    Self-drawn location sketch1000512511250
    Map-screenshot location sketch2417330223021
    Photograph2173027162716
    Total7300991279124
    Table 2. Composition of dataset
    Accuracy on testset /%Parameter quantity
    AlexNet94.8756884612
    XCTNet98.654935460
    Table 3. Detection accuracy and parameters
    Confusion matrixReal labelAccuracy /%
    Crime sceneoverview sketchSelf-drawnlocation sketchMap-screenshotlocation sketchNegativeclass
    Crime sceneoverview sketch2097391098.13
    Predicted labelSelf-drawnlocation sketch6711775194.16
    Map-screenshotlocation sketch333012399.70
    Negative class001271599.96
    Table 4. Confusion matrix
    Kaixuan Wang, Zhuorong Li, Xiaobin Wang, Shengdong Yan, Yunqi Tang. Automated Classification Method for Crime Scene Sketches[J]. Laser & Optoelectronics Progress, 2020, 57(4): 041009
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