1.4.You can find an image and its spectrum in following figure. Which filtering is more suitable for image denoising? (a) lowpass filter (b) highpass filter (c) bandpass filter (d) notch filter (e) bandreject filter 1.5. In Canny edge detection, we will get more discontinuous edges if we make the following change to the hysteresis thresholding: (a) increase the high threshold (b) decrease the high threshold (c) increase the low threshold (d) decrease the low threshold (e) decrease both thresholds