Sharmil Randhawa

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Demosaicking is an estimation process to determine missing color values when a single-sensor digital camera is used for color image capture. In this paper, we propose a number of new methods based on the application of Taylor series and cubic spline interpolation for color filter array demosaicking. To avoid the blurring of an edge, interpolants are first(More)
When a single image sensor is used to capture colour images, only one colour value is acquired at each pixel location. Colour filter array (CFA) demosaicking refers to the estimation of the other two missing colour values in order to produce a full colour image. In this paper, we have shown that cubic spline interpolation is suitable for CFA demosaicking(More)
By stitching together adjacent images from a video sequence surveying a scene, a video mosaic of the entire panorama can be formed. Since a video survey consists of a sequence of images having small relative displacements with respect to each other, there is redundant overlapping information in consecutive images so that not all consecutive video images are(More)
Demosaicking is a process to determine missing colour values at each pixel when a single-sensor digital camera is used for colour image capture. In this paper, we derived new extrapolation equations to improve the accuracy of demosaicking by including higher order terms of the Taylor series. Our proposed method will produce four direction-oriented estimates(More)
When a single image sensor is used to capture a colour image, only one colour at each pixel location is acquired. Colour filter array demosaicking is an interpolation process to evaluate those missing colour pixel values. However, an interpolation process will often blur a sharp edge. In our paper, four interpolants are first estimated using cubic(More)
As today’s digital cameras contain millions of image sensors, it is highly probable that the image sensors will contain a few defective pixels due to errors in the fabrication process. While these bad pixels would normally be mapped out in the manufacturing process, more defective pixels, known as hot pixels, could appear over time with camera usage. Since(More)
When a single-sensor digital camera is used for full colour image capture, only one colour for each pixel is acquired through the colour filter array which is placed in front of the image sensor. CFA demosaicking is a process for the estimation of the other missing colour values in order to produce a full colour image. To preserve sharp colour edges and(More)
Hot pixels are defective pixels in image sensors produced in the manufacturing process. The amount of these hot pixels is likely to be higher for higher resolution digital cameras, and this may increase with usage. These defective pixels are impulsive in nature and will cause severe colour artifact problems in the colour filter array (CFA) interpolation(More)