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We compared images reconstructed by three methods: ghost imaging (GI), Hadamard transform imaging (HTI), and scan-based imaging. Although GI and HTI use a bucket (or single channel) detector, GI has attracted more attention than HTI in recent years. Nevertheless, a direct comparison between them has not yet been conducted to the best of our knowledge. In the present work, we evaluate contrast ratios of images obtained from computational GI (CGI) and HTI under various signal-to-noise ratio (SNR) conditions. Our results indicate that HTI and CGI are useful in high- and low-SNR situations, respectively, although both methods have a similar performance. [ABSTRACT FROM AUTHOR]