Abstract
Abstract. This paper reports an experiment conducted to evaluate correction methods of chromatic aberrations in images acquired by a nonmetric digital camera. The chromatic aberration correction methods evaluated in the experiment are classified into two kinds. One is the method to correct image coordinates by using camera calibration results of color-separated images. The other is the method based on the assumption that the magnitude of chromatic aberrations can be expressed by a function of a radial distance from the center of an image frame. The former is classified further into five types according to the difference of orientation parameters common to all colors. The latter is classified further into three types according to the order of the correction function. We adopt a linear function, a quadratic function and a cubic function of the radial distance as a correction function. We utilize a set of 16 convergent images shooting a white sheet with 10 by 10 black filled circles to carry out camera calibration and estimate unknown coefficients in the correction function by means of least squares adjustment. We evaluate the chromatic aberration correction methods by using a normal image shooting a white sheet with 14 by 10 black filled circles. From the experiment results, we conclude that the method based on the assumption that the magnitude of chromatic aberrations can be expressed by a cubic function of the radial distance is the best method of the evaluated methods, and would be able to correct chromatic aberrations satisfactorily enough in many cases.
Highlights
As performance of a digital camera becomes better and its price becomes lower in recent years, digital camera images are becoming more popular in diverse fields
This paper reports an experiment conducted to evaluate several correction methods of chromatic aberrations in images acquired by a non-metric digital camera
The other was the method based on the assumption that the magnitude of lateral chromatic aberrations can be expressed by a function of a radial distance from the center of an image frame
Summary
As performance of a digital camera becomes better and its price becomes lower in recent years, digital camera images are becoming more popular in diverse fields. Kaufmann and Ladstädter (2005) reported an experiment to correct chromatic aberrations by using a lateral chromatic aberration model expressed by a linear function of a radial distance from the center of an image frame They estimated the model by means of least squares adjustment. Mallon and Whelan (2007) and Hattori et al (2011) reported experiments to correct chromatic aberrations by using their chromatic aberration models based on the Brown’s distortion model (Brown 1966) Their experiment results did not necessarily indicate that their proposed correction methods are able to provide satisfactory correction results equal to the measurement accuracy of single point features described in the literature by Luhmann et al (2006b). This paper reports an experiment conducted to evaluate several correction methods of chromatic aberrations in images acquired by a non-metric digital camera
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