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SIFT is one of the most robust and widely used image matching algorithms based on local features. But the key-points descriptor of SIFT algorithm have 128 dimensions. Aiming to the problem of its high dimension and complexity, a novel image matching algorithm is proposed. The descriptors of SIFT key-points are constructed by the rotation invariant LTP, city-block distance is also employed to reduce...
This paper presents an asynchronous boost-type light-emitting diode (LED) driver, integrating an ambient light sensor (ALS), based on a constant off-time control technique. The LED driver automatically regulates the LED current according to the surrounding illumination as sensed by the on-chip ALS. In backlighting applications, the brightness of the light source is adjusted inversely; therefore, we...
This paper presents a boost-type light-emitting-diode (LED) driver with an on-chip ambient light dimming for the liquid crystal display (LCD) backlight module in portable electronics. The proposed system integrates an ambient light sensor (ALS) to achieve the function of dimming control. By sensing the surrounding illumination, the LED driver automatically regulates the LED current, and, hence, the...
Light-emitting-diodes (LEDs) are commonly used for backlighting and lighting applications. For LEDs to be used as lighting or backlighting sources for vehicles, it is important to simplify the dimming scheme for LED drivers. Since the number of required LEDs varies with application, a single-ended primary-inductor converter (SEPIC) topology is suitable for the LED drivers to operate in a single battery...
This paper presents a novel parametric representation for bidirectional texture functions. Our method mainly relies on two original techniques, namely, multivariate spherical radial basis functions (SRBFs) and optimized parameterization. First, since the surface appearance of a real-world object is frequently a mixed effect of different physical factors, the proposed sum-of-products model based on...
Object tracking using vision technology is one of the important and complex functions in computer vision. It should become more challenge in case of there are partial occlusions and significant clutter. A mean shift procedure embedded approach for vehicle and pedestrian tracking under real road scenes is presents. A combined hue and saturation of HSI color model and local orientation information are...
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