Digital Image Processing Experiment Based on Original Image Histogram Analysis

In digital image processing experiments, histogram analysis of the original image revealed that the optimal segmentation threshold between background and target is approximately 130. The conversion from grayscale to binary image achieved ideal segmentation results. Image Processing Experiment (Part 6) - Image Compression and Encoding Objective: Learn JPEG compression encoding. Experimental Content: I. Implementing basic JPEG compression and encoding involves three steps: 1. First, remove data redundancy through Discrete Cosine Transform (DCT) - typically implemented using dct2() function in MATLAB or similar DCT libraries; 2. Quantize DCT coefficients using quantization tables - this involves element-wise division of DCT coefficients by quantization values; 3. Perform Huffman encoding on the quantized coefficients - implementing entropy encoding using frequency-based code assignment.

Furthermore, during the image compression and encoding experimentation process, optimization of compression algorithms can be considered to improve compression ratios while maintaining image quality. Experimental approaches may include testing different quantization tables, adjusting DCT transformation parameters (such as block size), and modifying Huffman coding implementations to find optimal compression strategies.

Another direction worth exploring involves understanding other image compression and encoding algorithms, such as PNG (lossless compression using DEFLATE algorithm) and GIF (LZW compression with color palette limitations). Comparative analysis of different algorithms provides comprehensive understanding of image compression and encoding methodologies in the field.

In summary, image compression and encoding in digital image processing experiments represents a significant research area. Through experimental processes, researchers can learn and master various compression and encoding algorithms, thereby enhancing their image processing skills and theoretical understanding.