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Method for adjusting graph sampling frequency

A technology of sampling frequency and graphics, applied in image analysis, image data processing, instruments, etc., can solve problems such as complex process, matching of different objects, and inaccurate object shape calibration, so as to improve efficiency, increase accuracy, and improve distortion and stretching effect

Active Publication Date: 2019-05-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Claims
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Problems solved by technology

The common image acquisition and correction method is implemented inside the processor by means of hardware or software. It needs to operate on a whole row of pixels, read out the stored multi-row pixels and stitch or interpolate the data, and finally store it again In the memory, the process is more complicated, and the calibration of the object shape is not very accurate
Moreover, when the line array camera collects images of falling objects, the air resistance encountered during the falling process is different due to the different densities of different objects, which makes it impossible to use the same sampling frequency to match different objects when screening target objects. A method for obtaining acquisition frequency and correcting object deformation for different substances

Method used

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  • Method for adjusting graph sampling frequency
  • Method for adjusting graph sampling frequency
  • Method for adjusting graph sampling frequency

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Embodiment 1

[0039] image 3 It is a schematic diagram of the processing structure and the composition of Embodiment 1 of a method for adjusting the sampling frequency of graphics in the present invention. figure 1 It is a flowchart of a method for adjusting graphic sampling frequency in the present invention. The specific implementation of this application in a specific application scenario is described according to the above flow chart.

[0040] This embodiment describes a method for adjusting the sampling frequency of graphics in the application of the present invention Figure 4 The specific implementation in the color sorting image acquisition system shown.

[0041] Such as Figure 4 As shown, a method for adjusting graphic sampling frequency in the present invention is based on a color selection image acquisition system. The system mainly includes an image acquisition unit, an image processor, a storage unit, and an image and video output unit, and a transmission unit can also be ...

Embodiment 2

[0053] This embodiment describes the specific implementation of optimizing the deformation correction effect in the color sorting image acquisition system.

[0054] In this embodiment, two screening modes are provided: 1. Increase matching accuracy through multiple image matching; 2. Increase accuracy through multi-feature point matching. The two modes are described below. In mode 1, initially N images are required (N 1 , N 2 …N N ) At least there is a matching image, and new falling images are continuously collected. After acquiring N images (N 1 , N 2 …N N ) data, perform preprocessing, feature point extraction, and feature point matching. If there are matching images in N images (N i , N j ), and then collect multiple times until the Xth image matches the two images in N (N i , N j ) match; if none of the N images match, the acquisition will stop until two of the subsequent Y acquisitions match any of the N images.

[0055] Among them, N is the number of images o...

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Abstract

The invention relates to a method for adjusting graph sampling frequency, and belongs to the technical field of image acquisition. The method comprises the following steps: acquiring a falling image of an object with a certain density through a linear array camera, identifying feature points of a current image through feature extraction, calculating a ratio of an object movement speed to a sensorsampling rate according to position deviations of the same feature points corresponding to different images, and calculating the movement speed of the current object according to the ratio; Therefore,the sampling frequency of the sensor is adjusted to eliminate deformation caused by mismatching of the falling speed of the object and the sampling rate of the sensor. According to the method, the distortion and expansion of images in a color selection image acquisition system are improved, and a good effect on restoring the shape of an imaging object is achieved. The flexibility of the color selection image acquisition system for color selection is improved. The image correction accuracy of the color selection image acquisition system is improved; The method has good distinction degree for imaging objects with different materials and densities, and is widely applied to identification and screening of various materials in a color selection image acquisition system.

Description

technical field [0001] The invention relates to a method for adjusting graphic sampling frequency, which belongs to the technical field of image acquisition. Background technique [0002] In the image acquisition technology, the sampling frequency of the image sensor is inseparable from the imaging effect, so the process of acquiring images should be optimized according to the sampling frequency. For an object moving in front of the camera, different materials, shapes, and densities will affect the speed of the object in the direction of vertical fall. If the sampling frequency does not match the speed of the object, then in the imaging, the object will appear Tension or compression in the vertical direction. The common image acquisition and correction method is implemented inside the processor by means of hardware or software. It needs to operate on a whole row of pixels, read out the stored multi-row pixels and stitch or interpolate the data, and finally store it again I...

Claims

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Application Information

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IPC IPC(8): G06T7/80G06T7/33
Inventor 张延军李慧琦赵宇娇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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