IJE TRANSACTIONS B: Applications Vol. 26, No. 11 (November 2013) 1267-1274   

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H. Hassanpour and A. Rostami Ghadi
( Received: January 13, 2013 – Accepted: February 28, 2013 )

Abstract    In this paper, a new approach is presented for improving image quality. It provides a new outlook on how to apply the enhancment methods on images. Image enhancement techniques may deal with the illumination, resolution, or distribution of pixels values. Issues such as the illumination of the scene and reflectance of objects affect on image captures. Generally, the pixels value of an image is proportional to the illumination of point in the scene and the reflectance of the object. Indeed, the captured image is the results of illumination and reflectance of the object. Hence, impairment the image may be due to each of the illumination or reflectance component. In this paper it is shown that various types of impairments have different effects on the illumination and reflectance of image components. Studies show that impairment effect on an image depending on the type of the impairment on one component is more to another component. Unlike conventional methods which do enhancement process on the original image for any type of impairment, in this paper it is to reduce the impairement effects from image components. Results of this research show that image enhancement based on the proposed method has better results comparing to applying enhancement methods on original image.


Keywords    Image Enhancement, Image component, illumination, reflectance



در این مقاله پیشنهاد جدیدی برای بهبود کیفیت تصویر ارائه شده است که در آن نگرش جدیدی در مورد چگونگی اعمال روش­های بهسازی مطرح شده است. عملیات بهسازی تصویر ممکن است بر اساس روشنایی، وضوح و یا توزیع سطوح خاکستری انجام شود. هنگام تصویربرداری ویژگی­هایی مانند شدت روشنایی صحنه و قابلیت بازتاب اجسام بر تصویری که بدست می­آید، تاثیر می­گذارند. بطور کلی، پیکسل­های یک تصویر به گونه­ای مقدار می­گیرند که متناسب با شدت روشنایی نقطه مربوط در صحنه و قابلیت بازتابش آن نقطه از جسم می­باشند. درواقع، تصویر بدست آمده نتیجه­ی شدت روشنایی و قابلیت بازتابش اشیاء است. بر این اساس خرابی یک تصویر ممکن است ناشی از هریک از مولفه­های شدت روشنایی و یا قابلیت انعکاسی باشند. در این مقاله نشان داده می­شود که انواع مختلف خرابی تصویر، روی مولفه­ شدت روشنایی و مولفه بازتابش تصویر تاثیر متفاوتی می­گذارند. بررسی­ها نشان می­دهند که تاثیر خرابی بر روی یک تصویر بسته به نوع خرابی روی یک مولفه­­ نسبت به مولفه­ی دیگر متفاوت می­باشد. برخلاف روشهای معمول که به ازای هر نوع خرابی، فرایند بهسازی و اصلاح را روی تصویر اصلی انجام می­دهند، در این مقاله پیشنهاد می­شود تاثیر خرابی را از مولفه­های تصویر کاهش دهند. نتایج این تحقیق نشان می­دهد که بهسازی تصویر بر مبنای روش پیشنهادی، نتایج بهتری در مقایسه با اعمال روش­های بهسازی بر روی تصویر اصلی دارد


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