Flame identification method and device using image analyses in HSI color space
First Claim
1. A flame identification method of identifying any flame image in a plurality of image frames captured consecutively from a monitored area, each of image frames including a plurality of pixels each having pixel data converted into a hue value, a saturation value and an intensity value in hue-saturation-intensity (HSI) color space, said flame identification method comprising the steps of:
- a) for each of the image frames,filtering the pixels based on the intensity values corresponding to the pixels, and intensity reference information to divide the pixels into intensity foreground pixels associated with fire-like intensity performance and intensity background pixels so as to obtain an intensity foreground area corresponding to the intensity foreground pixels, and so as to define within a corresponding one of the image frames a fire-like image region that contains the intensity foreground pixels when the intensity foreground area is greater than a predetermined intensity foreground area threshold,filtering all pixels in the fire-like image region based on the saturation values corresponding to all the pixels in the fire-like image region, and saturation reference information to divide all the pixels in the fire-like image region into first saturation foreground pixels associated with weak-fire saturation performance and saturation background pixels so as to obtain a first saturation foreground area corresponding to the first saturation foreground pixels, andcombining the intensity foreground area and the first saturation foreground area associated with the corresponding one of image frames to form a first two-dimensional (2-D) coordinate;
b) when a number (N) of the first 2-D coordinates corresponding to a sequence of the image frames are formed consecutively in step a), performing linear regression analyses on the first 2-D coordinates to generate a first determination coefficient; and
c) determining whether a flame image exists in the image frames based on the first determination coefficients generated in step b) and a predetermined identification threshold.
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Abstract
In a flame identification method and device for identifying any flame image in a plurality of frames captured consecutively from a monitored area, for each image frame, intensity foreground pixels are obtained based on intensity values of pixels, a fire-like image region containing the intensity foreground pixels is defined when an intensity foreground area corresponding to the intensity foreground pixels is greater than a predetermined intensity foreground area threshold, and saturation foreground pixels are obtained from all pixels in the fire-like image region based on saturation values thereof to obtain a saturation foreground area corresponding to the saturation foreground pixels. Linear regression analyses are performed on two-dimensional coordinates each formed by the intensity and saturation pixel areas associated with a corresponding image frame to generate a determination coefficient. Whether a flame image exists in the image frames is determined based on the determination coefficient and a predetermined identification threshold.
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Citations
12 Claims
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1. A flame identification method of identifying any flame image in a plurality of image frames captured consecutively from a monitored area, each of image frames including a plurality of pixels each having pixel data converted into a hue value, a saturation value and an intensity value in hue-saturation-intensity (HSI) color space, said flame identification method comprising the steps of:
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a) for each of the image frames, filtering the pixels based on the intensity values corresponding to the pixels, and intensity reference information to divide the pixels into intensity foreground pixels associated with fire-like intensity performance and intensity background pixels so as to obtain an intensity foreground area corresponding to the intensity foreground pixels, and so as to define within a corresponding one of the image frames a fire-like image region that contains the intensity foreground pixels when the intensity foreground area is greater than a predetermined intensity foreground area threshold, filtering all pixels in the fire-like image region based on the saturation values corresponding to all the pixels in the fire-like image region, and saturation reference information to divide all the pixels in the fire-like image region into first saturation foreground pixels associated with weak-fire saturation performance and saturation background pixels so as to obtain a first saturation foreground area corresponding to the first saturation foreground pixels, and combining the intensity foreground area and the first saturation foreground area associated with the corresponding one of image frames to form a first two-dimensional (2-D) coordinate; b) when a number (N) of the first 2-D coordinates corresponding to a sequence of the image frames are formed consecutively in step a), performing linear regression analyses on the first 2-D coordinates to generate a first determination coefficient; and c) determining whether a flame image exists in the image frames based on the first determination coefficients generated in step b) and a predetermined identification threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A flame identification device for identifying any flame image in a plurality of image frames captured consecutively from a monitored area, each of the image frames including a plurality of pixels, each of which has pixel data, said flame identification device comprising:
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a pixel data processor for converting the pixel data of each of the pixels of each of the image frames into a hue value, a saturation value and an intensity value in the hue-saturation-intensity (HSI) color space; a memory unit for storing intensity reference information and saturation reference information; and a processing unit coupled to said pixel data processor and said memory unit, and receiving the intensity values and the saturation values corresponding to each of the image frames from said pixel data processor, and including an intensity processor configured to filter, for each of the image frames, the pixels based on the intensity values corresponding to the pixels, and the intensity reference information from said memory unit to divide the pixels into intensity foreground pixels associated with fire-like intensity performance and intensity background pixels so as to obtain an intensity foreground area corresponding to the intensity foreground pixels, to determine whether the intensity foreground area is greater than a predetermined intensity foreground area threshold, and to define within a corresponding one of the image frames a fire-like image region that contains the intensity foreground pixels upon detecting that the intensity foreground area is greater than the predetermined intensity foreground area threshold, and a saturation processor configured to filter all pixels in the fire-like image region defined by said intensity processor based on the saturation values corresponding to all the pixels in the fire-like image region, and the saturation reference information from said memory unit to divide all the pixels in the fire-like image region into first saturation foreground pixels associated with weak-fire saturation performance and saturation background pixels so as to obtain a first saturation foreground area corresponding to the first saturation foreground pixels, and a determination processor configured to combine the intensity foreground area and the first saturation foreground area associated with the corresponding one of the image frames to form a first two-dimensional (2-D) coordinate, to perform linear regression analyses on a number (N) of the first 2-D coordinates formed consecutively thereby to generate a first determination coefficient, and to determine whether a flame image exists in the image frames based on the first determination coefficient and a predetermined identification threshold. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification