LOCO-I (LOw COmplexity LOssless COmpression for Images) is the algorithm at the results at the time (at the cost of high complexity), it could be argued that the improvement .. In the sequel, we assume that this term is tuned to cancel R. LOCO-I (LOw COmplexity LOssless COmpression for Images) is the . Faria, A method to improve HEVC lossless coding of volumetric medical images, Image . A. Lopes, R. d’Amore, A tolerant JPEG-LS image compressor foreseeing COTS. Liu Zheng-lin, Qian Ying2, Yang Li-ying, Bo Yu, Li Hui (), “An Improved Lossless Image Compression Algorithm LOCO-R”, International Conference On.

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Therefore, the prime objective has always been to find efficient and lossless compression methods.

Shamim Imtiaz for their help in conducting the trial. Wahid [ 8 ].

Captured lossless WLI images from live pig’s intestine: Photograph of the capsule prototype size compared with a The proposed compressor has lower computational complexity and memory requirements than the work in [ 24 ]. Intensity distribution of color components of an NBI image: A safer solution of this problem could be to use sufficient memory to store a complete image frame.

Absolute difference in consecutive pixel values.

Marcelo Weinberger – Google Scholar Citations

One image is captured using green light and another using blue light. Low-power image compression for wireless capsule endoscopy. The prototype supports various commpression modes including the commonly used white light imaging WLI and narrow band imaging NBI [ 7 ], and communicates with the data logger in full duplex fashion, which enables configuring the image size and imaging mode in real time during the examination. In order impfoved validate the performance of the compression algorithm, it is deployed inside an endoscopic capsule prototype developed in our lab.


An FPGA-based versatile development system for endoscopic capsule design optimization. The imprived of luminance component are encoded in Golomb-Rice code and the differences of chrominance components are encoded in unary code. The image data are then transferred to computer for reconstruction.

However, the compressor in [ 24 ] is implemented in ASIC platform, which resulted in lower power consumption. Besides, the YCoCg color space generates compressoon and green chrominance components which have no added significance when considering the properties of endoscopic images.

A wireless capsule endoscope system with low power controlling and processing ASIC. The experimental setup is shown in Figure Turcza [ 9 ]. These image sensors also do not have internal buffer memory for image storage and random access of pixels. Block diagram of the proposed lossless compression algorithm. Lovo-r wireless narrowband imaging chip for capsule endoscope.

When Equations 2 — 4 are implemented in digital hardware as integers, minor variations in the pixel values may occur due to the rounding of fractions to integers. As a result, we choose to use a 2. However, commercially available complementary metal-oxide-semiconductor CMOS image sensors [ 1617 ] send pixels in raster scan fashion i. In Table 7the proposed compressor is compared with other related compression algorithms.


An improved lossless image compression algorithm LOCO-R

Note that, the YEF color space does not discard the chrominance information; in fact, it is another representation of the RGB color space which is more suitable losslses compression and theoretically lossless. Images from different positions of GI tract. Author information Article notes Copyright and Algoirthm information Disclaimer. Swallowable medical devices for diagnosis and surgery: If there was any error, then it requests the transmitter to resend the data-packet again.

Besides, the practical limitation of the work is that the architecture assumed that the image sensor must have built-in RGB to YUV color space converter which limits the robustness.

The lossy algorithms found in literature are mainly based on transform coding where the Discrete Cosine Transform DCT is used [ 8 — 15 ]. Besides, the works of [ 2021 ] do not support NBI imaging comprdssion. Pig’s intestine is chosen for experiment due to its relatively similar gastrointestinal functions in comparison to humans [ 33 ]. Compression assessment based on medical image quality concepts using computer-generated test images.