Method for extracting target object in projection picture, projection interaction method and system thereof

A technology of target object and projection surface, applied in the field of projection, can solve the problems of poor recognition ability, low efficiency of projection interaction processing, difficult detection, etc., and achieve the effects of high precision, improved projection interaction processing efficiency, and good recognition ability.

Inactive Publication Date: 2014-12-10
GUANGDONG VTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In an interactive projection system, in order to recognize gestures, the target area must first be detected from the projected image: the hand area; there are many ways to use computer vision to detect the target area in traditional technology, and the most common one is to use the hand area. However, there are two disadvantages in using skin color for detection in projection interactive systems: one is that the light from the projector will change the color of the arm when it shines on the arm, which brings difficulties to the detection; When the projection screen itself contains human hands, it will cause false detection
[0005] To sum up, in the current field of projection interaction, for the method of detecting the target area in the projection screen, the accuracy of the detection result is low, resulting in a poor ability to recognize the motion behavior of the target object in the projection screen, and the processing efficiency of projection interaction is low. high

Method used

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  • Method for extracting target object in projection picture, projection interaction method and system thereof
  • Method for extracting target object in projection picture, projection interaction method and system thereof
  • Method for extracting target object in projection picture, projection interaction method and system thereof

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Embodiment 1

[0036] Such as figure 1 Shown is an application scene diagram of an embodiment of the method for extracting a target object in a projection screen of the present invention, including a computing device 12, a projection device 13, and a camera device 11; wherein, the projection device 13 and the camera device 11 are respectively connected with the computing device 12, the computing device 12 is used to store the projection content, control the projection device 13, receive the data input by the camera device 11, and perform image processing and analysis; the projection device 13 is used to project the projection content onto the projection surface 14, and the camera device 11 is used to The projection surface 14 is photographed to collect video data and image data.

Embodiment 2

[0038] Such as figure 2 As shown, it is a schematic flow chart of an embodiment of the method for extracting a target object in a projection screen according to the present invention. In this embodiment, the method is applied to a computing device for illustration, and may include the following steps:

[0039] S21. Acquire the projection image of the projector, and generate a projection prediction image of the projection image on the projection surface according to the preset position conversion relationship and pixel value conversion relationship;

[0040] S22. Collect a display image currently displayed on the projection surface through a camera device;

[0041] S23. Comparing the difference between the pixel values ​​of the display image and the pixel at the same position in the projected prediction image, extracting the pixels in the display image whose difference is greater than a preset threshold, and obtaining the target object.

[0042] In this embodiment, in the sys...

Embodiment 3

[0083] Such as Figure 7 As shown, the present invention also provides a projection interaction method. In this embodiment, the projection interaction method is applied to a computing device as an example. The method includes the method of extracting the target object from the projection screen in Embodiment 2, including the following step:

[0084] S21. Acquire the projection image of the projector, and generate a projection prediction image of the projection image on the projection surface according to the preset position conversion relationship and pixel value conversion relationship;

[0085] S22. Collect a display image currently displayed on the projection surface through a camera device;

[0086] S23. Comparing the difference between the pixel values ​​of the displayed image and the pixel at the same position in the projected predicted image, extracting the pixel in the displayed image whose difference is greater than a preset threshold, and obtaining the target object...

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Abstract

The invention provides a method and a system for extracting a target object in a projection picture. The method comprises the steps of: obtaining a projection image of a projector, and generating a projection prediction image of the projection image, with respect to a projection surface based on a preset position conversion relationship and a pixel value conversion relationship; acquiring a display image displayed on the projection surface through a photographing device; comparing a difference between the display image and a pixel value of a pixel point at the same position of the projection prediction image, and extracting pixel points with the difference value in the display image greater than a preset threshold value so as to obtain a target object. According to the invention, the target object can be extracted from the projection picture precisely. The invention also provides a projection interaction method and system, which can efficiently improve interactive processing efficiency during the projection.

Description

technical field [0001] The present invention relates to the field of projection technology, in particular to a method for extracting a target object from a projection screen, a system for extracting a target object from a projection screen, a projection interaction method, and a projection interaction system. Background technique [0002] Although multi-channel human-computer interaction technologies that comprehensively use vision, hearing, touch, smell, taste, etc. play an irreplaceable role. At present, as the latest computer input device, the touch screen is the simplest, most convenient and natural way of human-computer interaction. It endows multimedia with a new look and is a very attractive new multimedia interactive device. With the advancement of technology, the use of projectors has become more and more extensive, training conferences, classroom teaching, movie theaters and so on. The projector is easy to use, and it can turn any flat surface into a display scr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/74H04N9/31
Inventor 沈三明
Owner GUANGDONG VTRON TECH CO LTD
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