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Object detection method and device based on classifier

A target detection and classifier technology, which is applied in the field of target detection methods and devices based on classifiers, can solve the problems of long time required, too many false alarms in detection results, and a huge total number of samples, so as to reduce false alarms. , the effect of reducing the number of samples and reducing the dependency

Active Publication Date: 2017-03-15
艾智科技技术(深圳)有限公司
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Problems solved by technology

[0004] In summary, in the traditional technology, although the Adaboost classifier has a very short judgment time (microsecond level) for the sampled image, because it traverses and samples each layer, the total number of samples (usually reaching millions) is relatively large , so the time required for target detection is relatively long
In addition, since the Adaboost classifier performs binary judgment on the sampled images, the detection results are very dependent on the performance of the classifier. If the pre-trained Adaboost has high performance (for example, many positive and negative samples are used for training, etc.), the detection results will be relatively low. Accurate, but when the Adaboost classifier is not optimal, there will be too many false alarms in the detection results

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  • Object detection method and device based on classifier

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[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0046] see figure 2 , in one embodiment, a classifier-based object detection method is provided. The method includes:

[0047] In step 202, an image pyramid is established from the original image according to a preset scaling factor.

[0048] Specifically, in the field of video surveillance, images are captured by an image sensing device, which may be based on CMOS or CCD technology, and the original image may be the image directly captured by the image sensing device or after grayscale, etc. The image processed by means is not limited here. For the process of establishing an image pyramid fro...

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Abstract

The invention discloses a target detection method and device based on a classifier. The method comprises the steps that an image pyramid is established through original images according to preset zoom factors; X image layers in the middle of the image pyramid are extracted, traversing sampling is conducted through a fixed sliding window, corresponding confidence degrees of sampled images are calculated through the classifier, and confidence sampling points corresponding to the Y sampled images with the highest confidence degree in each image layer are obtained; the confidence sampling points corresponding to the XY sampled images with the highest confidence degree are mapped to corresponding points in each image layer of the image pyramid, and each confidence sampling point and the corresponding point form a sampling chain; a window image of the corresponding image layer of all the points in each sampling chain is extracted through the sliding window, the corresponding confidence degrees of all the window images are calculated through the classifier, and then the window image with the highest confidence degree in each sampling chain is obtained; the window images with the highest confidence degree in all the sampling chains are mapped to detection result windows in the original images; the detection result windows in the original images are combined.

Description

technical field [0001] The invention relates to the technical field of intelligent video surveillance, in particular to a classifier-based object detection method and device. Background technique [0002] Classifier algorithm is a commonly used object detection algorithm in the field of intelligent video analysis. The most common classifiers, such as the Adaboost classifier, were proposed by Freud and Shapire et al. The Adaboost algorithm extracts knowledge of target concepts by learning labeled positive and negative samples, thereby generalizing to other unseen detection processes. [0003] In the traditional target detection process, it is roughly divided into two parts. One is to continuously scale the resolution of the image to form an image pyramid. Such as figure 1 As shown, the scaling ratio δ<1 is the scaling factor, layer 0 is the original image, and layer 1 and layer 2 are images obtained by scaling the original image once or twice... . The second is to use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/62G06T7/00
Inventor 孙海涌
Owner 艾智科技技术(深圳)有限公司
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