Recent content by Joshuarr

Well, it's not identical. It is off by 1. haha. Almost. ;)

You're right. He says I should use the full-scale contrast stretch (FSCS) (which I developed in a previous problem) It's a linear mapping that takes the minimum value to 0 and the maximum value of the image to 255 (the maximum gray-level value in the range). The image was inverted again. So it...

\mathcal{F}^{-1} \{e^{i \pi} X \}=e^{i \pi}\mathcal{F}^{-1}\{X\} = -\mathcal{F}^{-1}\{X\} That explains the negative. I wasn't sure about the representation we were supposed to use, but I'm going to assume that he doesn't want to look at a black block. lol. This is what I wrote for my...

A MATLAB problem So, after playing with it some more, I've realized that the result of the ifft2 are negative. And after typecasting them to uint8, they all go to zero. I thought that Matlab would interpret them as the binary 2s complement representation and then give the corresponding uint8...

Homework Statement I'm working on a Matlab problem for a digital image processing class. The problem is to take an image, then take its 2D-FFT and offset the phase component by pi. Then to take the IFFT of the new DFT using the unmodified magnitude and modified phase. What I got was a...

Wow. Thanks a lot! I finally get it. So my biggest problem was φ, because this determined a different a_ρ and a_φ. The value of φ associated with point C is φ_c = Atan(2/3) = 33.69 degrees Thus, ρ component of V_cd = (-4 a_x -6 a_y + 9 a_z) dot a_ρ...

I'm not sure what you're telling me. If I want the position vectors associated with C and D in terms of constant unit vectors, then I can only represent that in terms of a_x, a_y, and a_z. I can't make a_ρ, a_φ constant, because they're not -- by definition. So the only way to express the...

Homework Statement 1.21 Express in cylindrical components: (a) the vector from C(3, 2,−7) to D(−1, −4, 2); (b) a unit vector at D directed toward C; (c) a unit vector at D directed toward the origin. I just want to know (a). And the solution from the book is attached, too...

Homework Statement It's attached. The problem and solution are given. Homework Equations The Attempt at a Solution I circled a part of the image in red. Is this substitution supposed to be an approximation? I was thinking it was because one is referring to angular motion, so...

I'm not sure what you mean by an "accelerating frame of reference." The frame of reference would be the table (which is stationary), no? I think by spheres you mean blocks, or perhaps that is some concept that I'm unfamiliar with.. Oh.. In this situation I would use the latter approach...

I think your 3M is a mistake (it's 1M, 2M, 2M), but I understand what you're saying. Oh. So it always ends up as a linear system of equations with n equations n unknowns (where n is the # of bodies), so I can use matrices! The other unknowns in this case would be the two tensions, what you...

lol, I was stuck on a problem involving tensions (I was using the total mass for m), and then I remember your saying something about that. Thanks! :)

Thanks, that did help a lot. :)

Homework Statement It's attached. Homework Equations F = m*a F_f = -μ_k*F_N // [Force of friction] = μ_k*[Normal force] The Attempt at a Solution So, I think I managed to solve it -- at least, I got what the book got, but I don't understand part of what I did to get the answer...

I understand. Thanks. This makes much more sense now. I really appreciate your response. :)