Quantitative and Qualitative Evaluation for Gamma Radiographic Image Enhancement
نویسندگان
چکیده
This paper presents some image processing techniques that can be used for radiographic image enhancement. Contrast enhancement, filtering, denoising, and interpolation processes are carried out in this paper. Contrast enhancement is carried out using adaptive histogram equalization. Filtering is carried out using median, Wiener, Lee, and Kuan filters. Wavelet and curvelet transforms are used for image denoising. Three interpolation are carried out. The results are evaluated qualitatively and quantitatively using the Peak Signal-to-Noise Ratio (PSNR), Root Mean Squire Error (RMSE), Standard Deviation (SD), smoothness, entropy, Structural Similarity (SSIM), and execution time. The results show that the contrast enhancement improves the radiographic image quality, the Wiener filter achieves better enhancement results than other filters, the curvelet transform denoising gives better enhancement than wavelet denoising. The bicubic interpolation with resolution factor two is promising in terms of the quality assessment metrics.
منابع مشابه
Image Quality Enhancement Using Pixel Wise Gamma Correction
This paper presents a new automatic image enhancement method by modifying the gamma value of its individual pixels. Most of existing gamma correction methods apply a uniform gamma value across the image. Considering the fact that gamma variation for a single image is actually nonlinear, the proposed method locally estimates the gamma values in an image using support vector machine. First, a dat...
متن کاملبررسی میزان کیفیت تصاویر رادیوگرافی در بیمارستان های ارجاعی دولتی شهرستان ساری در سال 96
Background and purpose: Image quality together with low patient dose is two important goals in radiography procedures. Acquire radiographic images with inadequate quality give rise to uselessly patient dose, improper diagnosis, waste the cost and impose the biological effect to the patients. In this study image quality was evaluated for most common radiographic procedures based on indentified i...
متن کاملبهسازی تصاویر با تکیه بر اطلاعات گاما
In this paper a new automatic method is presented to enhance the image brightness through gamma correction process. Most of current gamma correction methods apply a uniform gamma correction across the image. Considering the fact that gamma variation for a single image is actually nonlinear, the proposed method does the gamma correction in a local approach. Thus the method is able to estimate ap...
متن کاملA Phantom Study for the Optimization of Image Quality and Radiation Dose for Common Radiographic Examinations in Digital Radiography
Introduction: Phantom studies facilitate the implementation of radiation dose surveillance as a function of radiographic technical parameters for minimizing patient radiation dose. The evidence of such investigations can then be used to evaluate technical parameters used in the radiographic procedures to reduce radiation dose without compromising the image quality. Material and Methods: This ex...
متن کاملDeveloping a PC-based portal image contrast enhancement program
ABSTRACTBackground: Delivering the radiation dose to the target volume and minimizing the dose to normal tissues are the main objectives in radiotherapy. The aim of our study is to enhance the contrast of the portal image to increase the accuracy of delineation of the organs in the irradiation field. Methods: The software was written based on local enhancement of the pixel values in image ma...
متن کامل