—In complex scenario such as underwater imaging or
rough weather, local textures are unavailable due to image
blurring and background clutters. Global features like color and
contours became the important clues for object detection.
However, it is challenging to extract the object region with regard
to the variances of color and massive disruptions of object contour.
In this paper, we proposed a new method which used Color
Channel Ratio Image (CCRI) for edge detection. The CCRI-based
edge detection method can effectively extract the object contour in
complex scenario where traditional grayscale-based edge
detectors often fail. Moreover, we design a fast object detection
algorithm based on the CCRI image and chamfer matching.
Performing k-means clustering on the CCRI image can obtain the
candidate regions of the target object. Thus applying directional
chamfer matching only in the candidate regions can efficiently
speed up the detection procedure.