Dear Joe,

there are now hundreds of concepts related to brand image.

I would first try (according to your research objectives) choose a more specific concept. It could be brand equity, or brand attachment for ex.

For brand equity, here is a scale: http://www.emeraldinsight.com/doi/full/10.1108/07363769510095270

Good luck for your work. Best regards.

SG

Thank you for your answer, I am going to read this article carefully, my research objectives are how to improve brand image by comparing two situations (A and B) and then proving that for example A is better than B concerning brand image.

The following papers should be helpful to your topic: 

• Aaker, D. A. (1996). Measuring brand equity across products and markets. California management review, 38, 3, pp. 102-120.
• Cian, L. (2011). How to measure brand image: a reasoned review. The Marketing Review, 11, 2, pp. 165-187.
• Driesener, C. and Romaniuk, J. (2006). Comparing methods of brand image measurement. International Journal of Market Research, 48, 6, pp. 681-698.
• Keller, K. L. (1993). Conceptualizing, measuring, and managing customer-based brand equity. The Journal of Marketing, 57, 1, pp. 1-22.
• Keller, K. L. and Lehmann, D. R. (2006). Brands and branding: Research findings and future priorities. Marketing science, 25, 6, pp. 740-759. 

Thank you for your answer, these papers are also quite interesting