An image-processing device stores computer-readable instructions therein. The computer-readable instructions, when executed by a processor, cause the image-processing device to perform identifying an object in a target image represented by target image data. The object includes object pixels. The processor further performs setting frame regions for the object pixels and counting an intersection number. The partial object region is positioned within frame regions and has object pixels consecutively arranged. The processor performs calculating a ratio of first object pixels to the object pixels as a first ratio. Each first object pixel is an object pixel whose intersection number is 2. The processor performs judging whether the first ratio is greater than or equal to a first reference value and determining that the object is an encircling line that encloses a part of the target image if the first ratio is greater than or equal to the first reference value.