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System-on-a-chip integration of three dimensional time-of-flight image sensor invokes several technical issues, which are different from the case of conventional two dimensional CMOS image sensor. In this paper, we review several technical issues with examples of several cases, and suggest solutions especially in view point of pixel design.
CMOS image sensors transmit images by photoelectric conversion and consist of several key analog circuits. We discuss the structure and the overall operating principles of typical CMOS image sensor, and conduct analysis of the key analog circuits function. We carry out the discussion of the theoretical and mathematical principles of those circuits and then we design certain improved key analog circuits...
Recent physiological studies on nutrition and growth have shown that leaf area is a reliable index of growth factor determining carbohydrate metabolism, yield and quality of crops. Software was developed using image processing toolbox of MATLAB, for calculating parameters of multiple leaves like area, length, width etc. Sample of 50 leaves of various shapes and sizes were used in measurements and...
In this paper we propose a phase-sensitive pixel concept based on an avalanche photodiode (APD) with a charge sensitive amplifier (CSA) readout circuit, and its implementation in a standard CMOS technology. We exploit the principle of APD gain modulation to realize the functions of optical sensing and demodulation of light signals in one component, which can be exploited in several application domains,...
A high quality image can be synthesized by combining several differently exposed low dynamic range (LDR) images of the same scene. For scenes under low lighting condition, cameras are usually set to high sensitivity mode to reduce exposure times and avoid motion blur on captured images. However, those images tend to be noisy and the noise severely degrades the visual quality of final image especially...
In this paper, we proposed a swift impulse noise suppresser based on adaptive growth algorithm (AGA). It is mainly composed of three parts: signal detector, adaptive growth and indispensable reestablishment and correction. Firstly, we designed a signal detector to detect the real signal pixels and calculated signal density according to the analysis of the characteristic of impulse noise and the distribution...
The fingerprint image preprocessing is the premise and basis for fingerprint identification. It will directly influence the final outcome of fingerprint identification. In order to maintain and restore fingerprint ridge structures, and improve the noise immunity of fingerprint image preprocessing algorithm. In the paper, a method for getting direction image based on gradient is given. Using direction...
This paper deals with the video surveillance problem in static camera. The aim is to design a moving object detection system based on advanced CPU DM6437. After capturing the pictures according to the timing, the background model is established without the objects and the background information is real-time updated due to the changes of the environment. After that, background subtraction is used so...
Ship detection involves two correlated tasks — ship target detection and ship wake detection. This paper proposes a method for automatic ship wake detection from SAR image. A localized Radon transform is processed around the ship target to detect linear features after ship target detection. It can smooth the speckle noise and improve the SNR in Radon transform space. So the false alarms can be reduced...
Matching face image under assorted lighting conditions is a challenging task in a face recognition system (FRS). The feature extraction method used in Local Binary Pattern (LBP) fails in detecting the eye position and it is less sensitive to noise in uniform image regions. This paper proposes an Advanced Ternary Pattern (ATP) feature set to overcome these issues. The issue on noise sensitivity in...
In order to extract the regular interference contained in the multibeam echosounding and eliminate random noise, the novel Envelope Locally Weighted Best Estimation (ELWBE) and the improved NLMF (X-metric non local-mean filter, X-NLMF) methods are proposed. The experimental results show that ELWBE and X-NLMF can not only eliminate the random noise but also give the local optimal estimation on preserving...
Since 1 of the 20 detectors in Terra MODIS band 5 (1.230∼1.250 µm) are noisy, there are sharp and repetitive stripes over the entire image. As for MODIS geolocated data, the stripes are irregular and sometimes uncontinuous, it brings a difficult problem to the image retrieving process. This paper presents a detection method to extract the stripe noise, and a maximum a posteriori (MAP) based algorithm...
Medical diagnosis is one of the most important procedure in which image processing are usefully applied. In this paper, a pneumonia symptoms detection method based on cellular neural networks (CNNs) is proposed. The CNN design is characterized by a virtual template expansion obtained through a multistep operation. It is based on linear space invariant 3 × 3 templates. The proposed design is capable...
Evolutionary design has shown as a powerful technique in solving various engineering problems. One of the areas in which this approach succeeds is digital image processing. Image filtering represents a wide topic in 2D signal processing. In this case different types of noise are considered in the filtering process to restore the image quality that has been decreased by changing values of some pixels...
Edge detection algorithms often produce broken edges, especially in noisy images. We propose an algorithm based on discrete particle swarm optimisation (PSO) to detect continuous edges in noisy images. A constrained PSO-based algorithm with a new objective function is proposed to address noise and reduce broken edges. The localisation accuracy of the new algorithm is compared with that of a modified...
In literature several correlation filters have been proposed for image recognition. Traditionally linear correlation is applied among the images for this purpose, however, the operation is not robust when images are corrupted with non-Gaussian noise. In this paper we propose the use of morphological correlation combined with nonlinear filters for robust image recognition. Performance of the proposed...
The detection effect of the infrared gait image is not good by using traditional detecting methods based on the visible light mode because of its larger noise, blurrier edge and lower contrast. Therefore, a new algorithm of infrared gait detection based on chaos ant colony optimization and space-time combination is proposed. It uses background subtraction method based on temporal domain segmentation...
In this paper we construct a long-distance VGA signal extending system featuring the self-tuning capability. The physical carrier of the signal is the typical local area network (LAN) cables such as CAT-5e. By investigating the noise distributions over the carrier a video restoration algorithm is proposed. The algorithm calculates the associated statistics and identifies the optimal IC control parameters...
Given a pair of images, a stereoscopic display should execute the image plane calibration, the depth map estimation, and the multiple views rendering to show a 3-D picture. Among all signal processing stages, the depth estimation is the most critical one. This paper presents a real-time depth map estimation algorithm as well as parallel software architecture based on a GPU processor. The experimental...
Speckle is a granular multiplicative noise that reduces the resolution and contrast of the image there by degrading the diagnostic accuracy of the Ultrasound image. Speckle reduction technique has to be followed, to enhance the quality of ultrasound image. In this paper, an efficient algorithm capable of removing speckle noise using Particle Swarm Optimization (PSO) technique is presented. The algorithm...
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