Two compression algorithms for the image sequences generated by pulsedtransient thermography for non-destructive testing were developed. The first algorithm allows to balance the quality of the original measurement data reproduction against a compression ratio. This algorithm comprises a dedicated space/time mapping (STM) method and an image compression algorithm (JPEG2000). The second algorithm provides lossless reproduction of the original measurement data. This algorithm is based on a particular transformation of dynamically changing data and a lossless compression algorithm (ZIP). Both algorithms were tested on typical experimental thermography data. In both cases, the achieved compression ratios were significantly higher than those of existing algorithms.