USEQ: Ultra-Fast Superpixel Extraction via Quantization

USEAQ: Ultra-fast Superpixel Extraction via Adaptive Sampling from Quantizations


  • Author(s):

Chun-Rong Huang, Wei-Cheng Wang, Wei-An Wang, Szu-Yu Lin, and Yen-Yu Lin



  We present a novel and highly efficient superpixel extraction method called ultra-fast superpixel extraction via adaptive sampling from quantized regions (USEAQ) to generate regular and compact superpixels in an image. To reduce the computational cost of iterative optimization procedures adopted in most recent approaches, the proposed USEAQ for superpixel generation works in a one-pass fashion. It first performs joint spatial and color quantizations and groups pixels into regions. It then takes into account the variations between regions, and adaptively samples one or a few superpixel candidates for each region. It finally employs maximum a posteriori estimation to assign pixels to the most spatially consistent and perceptually similar superpixels. It turns out that the proposed USEAQ is quite efficient, and the extracted superpixels can precisely adhere to boundaries of objects. Experimental results show that USEAQ achieves better or equivalent performance compared with the state-of-the-art superpixel extraction approaches in terms of boundary recall, undersegmentation error, achievable segmentation accuracy, the average miss rate, average undersegmentation error, and average unexplained variation, and it is significantly faster than these approaches. The source code of USEAQ is available at


Software Download

Download USEAQ and ISEQ (ver 1.0) from GitHub


Please refer to the GitHub for the details of USEQ and USEAQ.



    This software of USEQ/USEAQ is available under the (GNU GPL or FIPL) for personal research usage only. Any commercial use or any redistribution of this software requires a license from the National Chung Hsing University. This license file must be retained with all copies of the software, including any modified or derivative versions. For further details on obtaining a commercial license, please contact Chun-Rong Huang ( THE NATIONAL CHUNG HSING UNIVERSITY, ACADEMIA SINICA AND THE AUTHORS MAKE NO REPRESENTATIONS OR WARRANTIES OF ANY KIND CONCERNING THIS SOFTWARE.

Release Notes


  • V1.0 First release of USEQ.

  • V1.0 First release of USEAQ.



Chun-Rong Huang crhuang at


[1] Chun-Rong Huang, Wei-Cheng Wang, Wei-An Wang, Szu-Yu Lin, and Yen-Yu Lin, "USEAQ: Ultra-fast Superpixel Extraction via Adaptive Sampling from Quantizations," IEEE Transactions on Image Processing, vol. 27, no. 10, pp. 4916-4931, Oct. 2018.

[2] Chun-Rong Huang, Wei-An Wang, Szu-Yu Lin, and Yen-Yu Lin, "USEQ: Ultra-Fast Superpixel Extraction via Quantization," in Proc. International Conference on Pattern Recognition, pp. 1966-1971, Dec. 2016..